[Chemical pollution, exposome and health in the Canary Islands population: An assessment of the situation.] / Contaminación química, exposoma y salud en la población de las Islas Canarias: una revisión sistemática de los estudios realizados y análisis de la situación.

OBJECTIVE: The set of exposures to chemical substances and their role as a cause of disease gives rise to the concept of the exposome, partially made up of chemical pollutants to which an individual is exposed, which is why, unlike the genome, it is an a priori modifiable factor, its study being crucial in terms of Public Health. The population of the Canary Islands has been studied in terms of its levels of chemical contamination, with numerous biomonitoring studies, which makes it necessary to characterise its exposome and its consequences in terms of disease, in order to implement specific corrective measures to minimize the impact on its health. METHODS: A review of scientific literature (MEDLINE and Scopus) was made, according to PRISMA criteria and PICO methodology, to include studies on biomonitoring of pollutants, or evaluating the effect of pollutants on diseases prevalent in the archipelago. RESULTS: Twenty-five studies, both population-based and hospital-based, were selected. The results show that the exposome is made up of at least 110 compounds or elements, 99 of which appear to be present from the intrauterine stage. The presence of chlorinated pollutants and metals stands out, which seems to be related to the high incidence of metabolic diseases (diabetes), cardiovascular diseases (hypertension) and certain types of neoplasms (breast cancer). In short, the consequences are conditioned by the genome of the exposed population, reinforcing the enormous importance of genome-exposome interactions in the development of pathologies. CONCLUSIONS: Our results indicate that it is necessary to establish corrective measures on the sources of pollution that modify the exposome of this population.

OBJETIVO: El conjunto de exposiciones a sustancias químicas y su papel como causa de enfermedad da lugar al concepto de exposoma, conformado parcialmente por contaminantes químicos a los que un individuo se ve expuesto. Por ello, a diferencia del genoma, es un factor a priori modificable, siendo su estudio crucial en materia de Salud Pública. La población del archipiélago canario ha sido estudiada en cuanto a sus niveles de contaminación química, con numerosos estudios de biomonitorización, lo que hace necesario caracterizar el exposoma de ésta y sus consecuencias en términos de enfermedad, para poder implementar medidas correctoras específicas que minimicen el impacto en su salud. METODOS: Se realizó una revisión de la literatura científica (MEDLINE y Scopus) de acuerdo con los criterios PRISMA y siguiendo la metodología PICO, para incluir estudios de biomonitorización de contaminantes, o que evaluaran el efecto de éstos en enfermedades prevalentes en el archipiélago. RESULTADOS: Se seleccionaron veinticinco estudios, tanto de base poblacional como de base hospitalaria. Los resultados demuestran que el exposoma lo conforman, como mínimo, 110 compuestos o elementos, 99 de los cuales parecen estar presentes desde la etapa intrauterina. Destaca la presencia de contaminantes clorados y metales, lo que parece relacionarse con la alta incidencia de enfermedades metabólicas (diabetes), cardiovasculares (hipertensión) y ciertos tipos de neoplasias (cáncer de mama). Aunque tales consecuencias vienen condicionadas por el genoma de la población expuesta, reforzando la enorme importancia de las interacciones genoma-exposoma en el desarrollo de patologías. CONCLUSIONES: Nuestros resultados indican que es necesario establecer medidas correctoras sobre las fuentes de contaminación que modifiquen el exposoma de esta población.

Contaminación química, exposoma y salud en la población de las Islas Canarias: una revisión sistemática de los estudios realizados y análisis de la situación / Chemical pollution, exposome and health in the Canary Islands population: An assessment of the situation

Fundamentos: El conjunto de exposiciones a sustancias químicas y su papel como causa de enfermedad da lugar al conceptode exposoma, conformado parcialmente por contaminantes químicos a los que un individuo se ve expuesto. Por ello, a diferenciadel genoma, es un factora priori modificable, siendo su estudio crucial en materia de Salud Pública. La población del archipiélagocanario ha sido estudiada en cuanto a sus niveles de contaminación química, con numerosos estudios de biomonitorización, lo quehace necesario caracterizar el exposoma de ésta y sus consecuencias en términos de enfermedad, para poder implementar medidascorrectoras específicas que minimicen el impacto en su salud.Métodos: Se realizó una revisión de la literatura científica (MEDLINE yScopus) de acuerdo con los criterios PRISMA y siguiendo lametodología PICO, para incluir estudios de biomonitorización de contaminantes, o que evaluaran el efecto de éstos en enfermedadesprevalentes en el archipiélago.Resultados: Se seleccionaron veinticinco estudios, tanto de base poblacional como de base hospitalaria. Los resultados de-muestran que el exposoma lo conforman, como mínimo, 110 compuestos o elementos, 99 de los cuales parecen estar presentes desdela etapa intrauterina. Destaca la presencia de contaminantes clorados y metales, lo que parece relacionarse con la alta incidencia deenfermedades metabólicas (diabetes), cardiovasculares (hipertensión) y ciertos tipos de neoplasias (cáncer de mama). Aunque talesconsecuencias vienen condicionadas por el genoma de la población expuesta, reforzando la enorme importancia de las interaccionesgenoma-exposoma en el desarrollo de patologías.Concluiones: Nuestros resultados indican que es necesario establecer medidas correctoras sobre las fuentes de contamina-ción que modifiquen el exposoma de esta población.(AU)

Background: The set of exposures to chemical substances and their role as a cause of disease gives rise to the concept of theexposome, partially made up of chemical pollutants to which an individual is exposed, which is why, unlike the genome, it is an a priorimodifiable factor, its study being crucial in terms of Public Health. The population of the Canary Islands has been studied in terms ofits levels of chemical contamination, with numerous biomonitoring studies, which makes it necessary to characterise its exposomeand its consequences in terms of disease, in order to implement specific corrective measures to minimize the impact on its health.Methods: A review of scientific literature (MEDLINE and Scopus) was made, according to PRISMA criteria and PICO methodology, toinclude studies on biomonitoring of pollutants, or evaluating the effect of pollutants on diseases prevalent in the archipelago.Results: Twenty-five studies, both population-based and hospital-based, were selected. The results show that the exposome is madeup of at least 110 compounds or elements, 99 of which appear to be present from the intrauterine stage. The presence of chlorinated po-llutants and metals stands out, which seems to be related to the high incidence of metabolic diseases (diabetes), cardiovascular diseases(hypertension) and certain types of neoplasms (breast cancer). In short, the consequences are conditioned by the genome of the exposedpopulation, reinforcing the enormous importance of genome-exposome interactions in the development of pathologies.Conclusions: Our results indicate that it is necessary to establish corrective measures on the sources of pollution that modifythe exposome of this population.(AU)

Identifying Adverse Events in Patients Hospitalized in Isolation or Quarantine Due to COVID-19.

BACKGROUND: This study evaluated the adverse events of COVID-19 isolation or quarantine in patients with nosocomial SARS-CoV-2 infection admitted to the Hospital Universitario Insular de Gran Canaria. METHODS: This is a retrospective cohort study with 30-day follow-up of 126 patients diagnosed with nosocomial COVID-19 through polymerase chain reaction test, between May 1 and June 30, 2022, in a 500-bed university hospital in the island of Gran Canaria. RESULTS: Between May 1 and July 30, 2022, a total of 2250 patients were admitted to the Hospital Universitario Insular de Gran Canaria; 126 of them were diagnosed with nosocomial COVID-19 through a polymerase chain reaction test. The rate of nosocomial COVID-19 infection was 5.6%. From the 126 patients of the study population, 27 experienced an adverse event (21.4%) and 2 experienced 2 adverse events (1.6%) due to COVID-19 isolation or quarantine. Thus, a total of 31 adverse events occurred in 29 patients. These events included the following: delay in transfer to other centers of 11 patients who were pending of receiving a negative COVID-19 test result (35.5%), delay or cancellation of diagnostic tests in 9 patients (29%), delay or cancellation of doctor visit in 7 patients (22.6%), and delay or cancellation of surgical or other interventions in 4 patients (12.9%). CONCLUSIONS: Because of the adverse consequences of nosocomial COVID-19 infection in hospitalized patients, measures should be observed for the prevention and control of nosocomial infection transmission, and adverse events related to patient safety issues in health care in isolated or quarantined COVID-19 patients should be prevented.

Lifting COVID-19 mitigation measures in Spain (May-June 2020).

Introduction: The state of alarm was declared in Spain due to the COVID-19 epidemic on March 14, 2020, and established population confinement measures. The objective is to describe the process of lifting these mitigation measures. Methods: The Plan for the Transition to a New Normality, approved on April 28, contained four sequential phases with progressive increase in socio-economic activities and population mobility. In parallel, a new strategy for early diagnosis, surveillance and control was implemented. A bilateral decision mechanism was established between the Spanish Government and the autonomous communities (AC), guided by a set of qualitative and quantitative indicators capturing the epidemiological situation and core capacities. The territorial units were established ad-hoc and could be from Basic Health Zones to entire AC. Results: The process run from May 4 to June 21, 2020. AC implemented plans for reinforcement of core capacities. Incidence decreased from a median (50% of territories) of 7.4 per 100,000 in 7 days at the beginning to 2.5 at the end. Median PCR testing increased from 53% to 89% of suspected cases and PCR total capacity from 4.5 to 9.8 per 1000 inhabitants weekly; positivity rate decreased from 3.5% to 1.8%. Median proportion of cases with traced contacts increased from 82% to 100%. Conclusion: Systematic data collection, analysis, and interterritorial dialogue allowed adequate process control. The epidemiological situation improved but, mostly, the process entailed a great reinforcement of core response capacities nation-wide, under common criteria. Maintaining and further reinforcing capacities remained crucial for responding to future waves.

Introducción: El 14 de marzo de 2020 España declaró el estado de alarma por la pandemia por COVID-19 incluyendo medidas de confinamiento. El objetivo es describir el proceso de desescalada de estas medidas. Métodos: Un plan de transición hacia una nueva normalidad, del 28 de abril, incluía 4 fases secuenciales incrementando progresivamente las actividades socioeconómicas y la movilidad. Concomitantemente, se implementó una nueva estrategia de diagnóstico precoz, vigilancia y control. Se estableció un mecanismo de decisión bilateral entre Gobierno central y comunidades autónomas (CCAA), guiado por un panel de indicadores cualitativos y cuantitativos de la situación epidemiológica y las capacidades básicas. Las unidades territoriales evaluadas comprendían desde zonas básicas de salud hasta CCAA. Resultados: El proceso se extendió del 4 de mayo al 21 de junio y se asoció a planes de refuerzo de las capacidades en las CCAA. La incidencia disminuyó de una mediana inicial de 7,4 por 100.000 en 7 días a 2,5 al final del proceso. La mediana de pruebas PCR aumentó del 53% al 89% de los casos sospechosos, y la capacidad total de 4,5 a 9,8 pruebas semanales por 1.000 habitantes; la positividad disminuyó del 3,5% al 1,8%. La mediana de casos con contactos trazados aumentó del 82% al 100%. Conclusión: La recogida y análisis sistemático de información y el diálogo interterritorial logaron un adecuado control del proceso. La situación epidemiológica mejoró, pero sobre todo, se aumentaron las capacidades, en todo el país y con criterios comunes, cuyo mantenimiento y refuerzo fue clave en olas sucesivas.

Lifting COVID-19 mitigation measures in Spain (May-June 2020).

INTRODUCTION: The state of alarm was declared in Spain due to the COVID-19 epidemic on March 14, 2020, and established population confinement measures. The objective is to describe the process of lifting these mitigation measures. METHODS: The Plan for the Transition to a New Normality, approved on April 28, contained four sequential phases with progressive increase in socio-economic activities and population mobility. In parallel, a new strategy for early diagnosis, surveillance and control was implemented. A bilateral decision mechanism was established between the Spanish Government and the autonomous communities (AC), guided by a set of qualitative and quantitative indicators capturing the epidemiological situation and core capacities. The territorial units were established ad-hoc and could be from Basic Health Zones to entire AC. RESULTS: The process run from May 4 to June 21, 2020. AC implemented plans for reinforcement of core capacities. Incidence decreased from a median (50% of territories) of 7.4 per 100,000 in 7 days at the beginning to 2.5 at the end. Median PCR testing increased from 53% to 89% of suspected cases and PCR total capacity from 4.5 to 9.8 per 1000 inhabitants weekly; positivity rate decreased from 3.5% to 1.8%. Median proportion of cases with traced contacts increased from 82% to 100%. CONCLUSION: Systematic data collection, analysis, and interterritorial dialogue allowed adequate process control. The epidemiological situation improved but, mostly, the process entailed a great reinforcement of core response capacities nation-wide, under common criteria. Maintaining and further reinforcing capacities remained crucial for responding to future waves.

[Health impact of COVID pandemic. SESPAS Report 2022]. / El impacto de la pandemia de COVID-19 sobre la salud. Informe SESPAS 2022.

OBJECTIVE: The World Health Organization declared the global SARS-CoV-2 infection a pandemic on March 11, 2020. The objective of this paper is to present its impact in terms of physical and mental health 22 months later. METHOD: We have reviewed results from published meta-analysis and systematic reviews, and some individual articles on specific aspects of special interest. National information on infection comes for the Red Nacional de Vigilancia Epidemiológica (RENAVE). RESULTS: Up to the end of October, more than 250 million infections and 5 million deaths had been reported globally. In Spain, 4.7 million infections have been documented although the real figure might be above 7 million. The pandemic has reduced life expectancy, and its effects have been especially dramatic in people with comorbidities and the elderly. There is a worsening of mental health in the general population. It is foreseeable that some groups, such as health professionals, mostly women, and front-line workers, may have a greater risk of developing mental health pathologies. The pandemic and the control measures have had other undesirable consequences such as a decrease in healthcare utilization, an increase in sedentary lifestyle or an increase in gender violence. In addition to its immediate effect on morbidity and mortality, the control measures have damaged the overall health status of the global population. CONCLUSIONS: Longitudinal studies are necessary to determine the mid and long consequences of the pandemic and the control measures, and to identify and evaluate effective health interventions.

[Apropriateness of hospital admissions due to COVID-19 in the 2nd and 5th phase of the pandemic.] / Adecuación de ingresos hospitalarios por COVID-19 en la 2ª y 5ª fase de la pandemia.

OBJECTIVE: The increase in the demand for healthcare caused by COVID-19 implies a lower availability of health resources and influences the appropriateness of their use. Due to the variability of demand during the pandemic, the study aimed to compare the appropriateness of hospital admissions between the 2nd and 5th phases of the pandemic according to the criteria of the Hospital Emergency Service (CiHRyC). These results were compared with those obtained according to the Pneumonity Severity Index (FINE) and the Appropriateness Evaluation Protocol (AEP). As a secondary objective, the clinical and sociodemographic characteristics of the patients studied were described. METHODS: 80 patients hospitalized from the Emergency Department were randomly selected in two study periods (2nd and 5th pandemic phase) obtained from the registry of hospitalizations of the Preventive Medicine service of Hospital Ramon y Cajal. Prevalences of inappropriateness were estimated according to the CiHRyC, FINE and AEP and an analysis was performed using univariate logistic regression between epidemiological variables of both periods collected through the electronical medical records. RESULTS: Inappropriateness of admissions were 35% and 45% in the 2nd and 5th phase of the pandemic according with CiHRyC, 25% and 5/% according with FINE and 0% and 5% according with AEP. Median age was 71.4 and 50.0 years in 2nd and 5th phase (p=0.02). 72.5% and 17.5% of the patients in the 2nd and 5th phases had at least one risk factor for COVID-19 severe illness (p<0.01). CONCLUSIONS: The measurement tools used identified more inappropriately cases in the 5th phase of the pandemic than in the 2nd one. CiHRyC coincided with FINE and AEP in the result of their evaluation.

OBJETIVO: El aumento de la demanda asistencial hospitalaria producida por la COVID-19 supone una menor disponibilidad de recursos sanitarios e influye en la adecuación de su utilización. Debido a la variabilidad de la demanda durante la pandemia, el objetivo del estudio fue comparar la adecuación de los ingresos hospitalarios entre la 2ª y 5ª fase de la pandemia según los criterios del servicio de Urgencias del Hospital (CiHRyC). Se compararon estos resultados con los obtenidos según el Pneumonity Severity Index (FINE) y el Appropriateness Evaluation Protocol (AEP). Como objetivo secundario se describieron las características clínicas y sociodemográficas de los pacientes estudiados. METODOS: Se seleccionaron aleatoriamente 80 pacientes hospitalizados desde Urgencias en dos periodos de estudio (2ª y 5ª fase pandémica) obtenidos del registro de hospitalizaciones del servicio de Medicina Preventiva del Hospital Ramón y Cajal. Se estimaron las prevalencias de inadecuación según los CiHRyC, el FINE y el AEP para admisiones y se realizó un análisis mediante regresión logística univariante entre las variables epidemiológicas de ambos periodos recogidas mediante la Historia Clínica Electrónica (HCE). RESULTADOS: La inadecuación de la hospitalización fue del 35% y 45% en la 2ª y 5ª fase de la pandemia con los CiHRyC, del 25% y 57% con el FINE y del 0% y 5% con el AEP. La mediana de edad fue de 71,4 y 50 años en la 2ª y 5ª fase (p=0,02). El 72,5% y el 17,5% de los pacientes de la 2ª y 5ª fase tuvieron al menos un factor de riesgo de complicaciones de COVID-19 (p<0,01). CONCLUSIONES: Los instrumentos de medida empleados (CiHRyC, el FINE y el AEP) identificaron más casos inadecuadamente ingresados en la 5ª fase de la pandemia que en la 2ª, coincidiendo el CiHRyC con el FINE y el AEP en el resultado de su evaluación.

Adecuación de ingresos hospitalarios por COVID-19 en la 2ª y 5ª fase de la pandemia / Apropriateness of hospital admissions due to COVID-19 in the 2nd and 5th phase of the pandemic

Fundamentos: El aumento de la demanda asistencial hospitalaria producida por la COVID-19 supone una menor disponibilidad de recursos sanitarios e influye en la adecuación de su utilización. Debido a la variabilidad de la demanda durante la pandemia, el objetivo del estudio fue comparar la adecuación de los ingresos hospitalarios entre la 2ª y 5ª fase de la pandemia según los criterios del servicio de Urgencias del Hospital (CiHRyC). Se compararon estos resultados con los obtenidos según el Pneumonity Severity Index (FINE) y el Appropriateness Evaluation Protocol (AEP). Como objetivo secundario se describieron las características clínicas y sociodemográficas de los pacientes estudiados. Métodos: Se seleccionaron aleatoriamente 80 pacientes hospitalizados desde Urgencias en dos periodos de estudio (2ª y 5ª fase pandémica) obtenidos del registro de hospitalizaciones del servicio de Medicina Preventiva del Hospital Ramón y Cajal. Se estimaron las prevalencias de inadecuación según los CiHRyC, el FINE y el AEP para admisiones y se realizó un análisis mediante regresión logística univariante entre las variables epidemiológicas de ambos periodos recogidas mediante la Historia Clínica Electrónica (HCE). Resultados: La inadecuación de la hospitalización fue del 35% y 45% en la 2ª y 5ª fase de la pandemia con los CiHRyC, del 25% y 57% con el FINE y del 0% y 5% con el AEP. La mediana de edad fue de 71,4 y 50 años en la 2ª y 5ª fase (p=0,02). El 72,5% y el 17,5% de los pacientes de la 2ª y 5ª fase tuvieron al menos un factor de riesgo de complicaciones de COVID-19 (p<0,01). Conclusiones: Los instrumentos de medida empleados (CiHRyC, el FINE y el AEP) identificaron más casos inadecuadamente ingresados en la 5ª fase de la pandemia que en la 2ª, coincidiendo el CiHRyC con el FINE y el AEP en el resultado de su evaluación.(AU)

Background: The increase in the demand for healthcare caused by COVID-19 implies a lower availability of health resources and influences the appropriateness of their use. Due to the variability of demand during the pandemic, the study aimed to compare the appropriateness of hospital admissions between the 2nd and 5th phases of the pandemic according to the criteria of the Hospital Emergency Service (CiHRyC). These results were compared with those obtained according to the Pneumonity Severity Index (FINE) and the Appropriateness Evaluation Protocol (AEP). As a secondary objective, the clinical and sociodemographic characteristics of the patients studied were described. Methods: 80 patients hospitalized from the Emergency Department were randomly selected in two study periods (2nd and 5th pandemic phase) obtained from the registry of hospitalizations of the Preventive Medicine service of Hospital Ramon y Cajal. Prevalences of inappropriateness were estimated according to the CiHRyC, FINE and AEP and an analysis was performed using univariate logistic regression between epidemiological variables of both periods collected through the electronical medical records. Results: Inappropriateness of admissions were 35% and 45% in the 2nd and 5th phase of the pandemic according with CiHRyC, 25% and 5/% according with FINE and 0% and 5% according with AEP. Median age was 71.4 and 50.0 years in 2nd and 5th phase (p=0.02). 72.5% and 17.5% of the patients in the 2nd and 5 th phases had at least one risk factor for COVID-19 severe illness (p<0.01). Conclusions: The measurement tools used identified more inappropriately cases in the 5th phase of the pandemic than in the 2 nd one. CiHRyC coincided with FINE and AEP in the result of their evaluation.(AU)

A population-based controlled experiment assessing the epidemiological impact of digital contact tracing.

While Digital contact tracing (DCT) has been argued to be a valuable complement to manual tracing in the containment of COVID-19, no empirical evidence of its effectiveness is available to date. Here, we report the results of a 4-week population-based controlled experiment that took place in La Gomera (Canary Islands, Spain) between June and July 2020, where we assessed the epidemiological impact of the Spanish DCT app Radar Covid. After a substantial communication campaign, we estimate that at least 33% of the population adopted the technology and further showed relatively high adherence and compliance as well as a quick turnaround time. The app detects about 6.3 close-contacts per primary simulated infection, a significant percentage being contacts with strangers, although the spontaneous follow-up rate of these notified cases is low. Overall, these results provide experimental evidence of the potential usefulness of DCT during an epidemic outbreak in a real population.

Exposure to polycyclic aromatic hydrocarbons (PAHs) and bladder cancer: evaluation from a gene-environment perspective in a hospital-based case-control study in the Canary Islands (Spain).

BACKGROUND: Exposure to polycyclic aromatic hydrocarbons (PAHs) has been linked to bladder cancer. OBJECTIVE: To evaluate the role of PAHs in bladder cancer, PAHs serum levels were measured in patients and controls from a case-control study. METHODS: A total of 140 bladder cancer patients and 206 healthy controls were included in the study. Sixteen PAHs were analyzed from the serum of subjects by gas chromatography-mass spectrometry. RESULTS: Serum PAHs did not appear to be related to bladder cancer risk, although the profile of contamination by PAHs was different between patients and controls: pyrene (Pyr) was solely detected in controls and chrysene (Chry) was exclusively detected in the cases. Phenanthrene (Phe) serum levels were inversely associated with bladder cancer (OR = 0·79, 95%CI = 0·64-0·99, P = 0·030), although this effect disappeared when the allelic distribution of glutathione-S-transferase polymorphisms of the population was introduced into the model (multinomial logistic regression test, P = 0·933). Smoking (OR = 3·62, 95%CI = 1·93-6·79, P<0·0001) and coffee consumption (OR = 1·73, 95%CI = 1·04-2·86, P = 0·033) were relevant risk factors for bladder cancer. CONCLUSIONS: Specific PAH mixtures may play a relevant role in bladder cancer, although such effect seems to be highly modulated by polymorphisms in genes encoding xenobiotic-metabolizing enzymes.

Blood pressure in relation to contamination by polychlorobiphenyls and organochlorine pesticides: Results from a population-based study in the Canary Islands (Spain).

BACKGROUND: Epidemiological studies have reported significant associations between exposure to persistent organic pollutants (POPs) and increased blood pressure (BP). Environmental exposure to POPs, mainly organochlorine pesticides, is of concern to the population of the Canary Islands, who display a high prevalence of diseases associated with hypertension such as metabolic syndrome, obesity and cardiovascular disease. OBJECTIVE: We performed this population-based study in a representative population sample from this archipelago to evaluate whether serum levels of selected POPs could be considered as hypertension risk factors. METHODS: BP and several other well-known factors related to hypertension (gender, age, smoking, BMI, and total lipids) were recorded in 428 adult participants from the Canary Islands Nutritional Survey. In total, 28 POPs (including 18 polychlorinated biphenyl (PCB) congeners and 10 organochlorine pesticides and metabolites) were measured in the serum of the population enrolled in this survey. RESULTS: In total, 167 subjects (39%) demonstrated hypertension or used antihypertensive medication. We observed a positive association between systolic and diastolic BP and p,p'-DDE (r=0.222; p<0.001, and r=0.123; p=0.015, respectively). Conversely, an inverse association between systolic BP and aldrin was observed (r=-0.120; p=0.017). After adjusting for known confounders, only aldrin was inversely related to hypertension risk [OR: 0.28 (95% CI: 0.09-0.92); p=0.037]. After excluding subjects undergoing anti-hypertensive treatment, we also observed that aldrin was inversely associated with systolic BP in multivariate analyses, especially in men [OR: 0.126 (95% CI: 0.021-0.763); p=0.024]. CONCLUSION: Although it has been postulated that background POPs exposure may play a relevant role on elevated BP, we did not observed increased hypertension risk in relation to serum POPs in this cross-sectional study. Conversely, the cyclodiene pesticide aldrin was negatively associated with hypertension, suggesting that cyclodienes could exert an effect opposite of the DDT metabolites. These findings agree with other previous works indicating that POPs may induce divergent actions on BP and suggest that the direction of the association between BP and POPs could be dependent on the chemical structure as well as concentration of the evaluated POP. Prospective studies are needed to clarify the effect exerted by POPs on BP.

Consumption of foods of animal origin as determinant of contamination by organochlorine pesticides and polychlorobiphenyls: results from a population-based study in Spain.

The level of contamination with persistent organic pollutants (POPs) and dietary habits and food consumption was extensively studied in the population from the Canary Islands (Spain). Because foodstuffs of animal origin are well known to be prominent contributors to these contaminants, the current study aimed to assess the role of the dietary intake of animal products as a probability factor for increased serum POPs. The intake of animal products (dietary variables) as a determining factor for serum POP levels was investigated using multivariate statistical models. Our results showed that while poultry, rabbit, and cheese consumption increases the probability of having high levels of non-DDT-derivative pesticides, sausage, yogurt, lard, and bacon consumption decreases the probability of having high levels of these pesticides. In addition, poultry, rabbit, eggs, cream, and butter consumption increased the probability of having detectable levels of marker PCB, while dairy desserts decreased the probability of having detectable levels of these PCBs. On the contrary, sausage and meat consumption increased the probability of having detectable levels of dioxin-like PCBs (DL-PCBs). The current results confirm that dietary intake of foodstuffs of animal origin is a relevant risk factor for the accumulation of POPs (and therefore their serum levels). Our study indicates that the analysis of dietary patterns may be useful for identifying those individuals that will probably present a high body burden of POPs. Because POPs can exert deleterious effects on human health, the identification of populations at risk of being highly contaminated is mandatory in order to implement policies that minimize the exposure to these compounds.

Association of the European lactase persistence variant (LCT-13910 C>T polymorphism) with obesity in the Canary Islands.

BACKGROUND: European lactose tolerance genotype (LCT -13910 C>T, rs4988234) has been positively associated to body mass indexes (BMI) in a meta-analysis of 31,720 individuals of northern and central European descent. A strong association of lactase persistence (LP) with BMI and obesity has also been traced in a Spanish Mediterranean population. The aim of this study was to analyze a potential association of LP compared to lactase non-persistence (LNP) with BMI in inhabitants of the Canary Islands of Spain using Mendelian randomization. METHODS: A representative, randomly sampled population of adults belonging to the Canary Islands Nutrition Survey (ENCA) in Spain, aged 18-75 years (n = 551), was genotyped for the LCT - 13910 C>T polymorphism. Milk consumption was assessed by a validated questionnaire. Anthropometric variables were directly measured. WHO classification of BMI was used. RESULTS: LP individuals were significantly more obese than LNP subjects (χ(2) = 10.59; p<0.005). LP showed in a multivariate linear regression analysis showed a positive association of LP with BMI compared to LNP, (ß = 0.96; 95% CI: 0.08-1.85, p = 0.033). In a multinomial logistic regression analysis normal range weight LP subjects showed an odds ratio for obesity of 2.41; 95%CI 1.39-418, (p = 0.002) compared to LNP. CONCLUSIONS: The T-13910 of the allele LCT-13910 C>T polymorphism is positively associated with BMI. LP increases significantly the risk to develop obesity in the studied population. The LCT-13910 C>T polymorphism stands proxy for the lifetime exposure pattern, milk intake, that may increase susceptibility to obesity and to obesity related pathologies.

The relationship between dioxin-like polychlorobiphenyls and IGF-I serum levels in healthy adults: evidence from a cross-sectional study.

OBJECTIVE: Insulin-like growth factor I (IGF-I) and dioxin-like polychlorobiphenyls (DL-PCBs) have been associated with the pathogenesis of several diseases like cancer, diabetes and growth disorders. Because it has been suggested that organohalogenated contaminants could influence IGF-I levels in adults, the potential relationship between DL-PCBs and IGF-I serum levels was studied in 456 healthy adults from a representative sample of the general population of the Canary Islands (Spain). DESIGN: Free circulating serum levels of IGF-I and IGFBP-3 were measured through an ELISA methodology, while the serum levels of the 12 DL-PCBs congeners (IUPAC numbers # 77, 81, 105, 114, 118, 123, 126, 156, 157, 167, 169, and 189) were measured by gas chromatography/mass spectrometry (GC-MS). RESULTS: DL-PCBs 156 and 167, Total DL-PCBs body burden (∑PCBs: sum over the 12 measured DL-PCBs), and Total toxic burden (in terms of toxic equivalence to dioxins: ∑TEQs) showed a trend of inverse association with IGF-I serum levels in the whole studied population. After adjusting for potential confounders, including gender, body mass index (BMI), age, and IGF-binding protein-3 (IGFBP-3), younger (18-45 years) women with lower BMI (<27 kg/m(2)) and detectable levels of DL-PCB-156 showed significantly lower IGF-I levels than those in the same age and BMI subgroup with non-detectable levels of DL-PCB-156 (p<0.001). Similarly, ∑PCBs and ∑TEQs showed a tendency to an inverse association with IGF-I levels in the same group of women (p=0.017 and p=0.019 respectively). CONCLUSIONS: These findings suggest that DL-PCBs could be involved in the regulation of the IGF-system in a way possibly influenced by gender, age and BMI. Although these results should be interpreted with caution, such circumstances could contribute to explain the development of diseases associated to the IGF system.

Complex organochlorine pesticide mixtures as determinant factor for breast cancer risk: a population-based case-control study in the Canary Islands (Spain).

BACKGROUND: All the relevant risk factors contributing to breast cancer etiology are not fully known. Exposure to organochlorine pesticides has been linked to an increased incidence of the disease, although not all data have been consistent. Most published studies evaluated the exposure to organochlorines individually, ignoring the potential effects exerted by the mixtures of chemicals. METHODS: This population-based study was designed to evaluate the profile of mixtures of organochlorines detected in 103 healthy women and 121 women diagnosed with breast cancer from Gran Canaria Island, and the relation between the exposure to these compounds and breast cancer risk. RESULTS: The most prevalent mixture of organochlorines among healthy women was the combination of lindane and endrin, and this mixture was not detected in any affected women. Breast cancer patients presented more frequently a combination of aldrin, dichlorodiphenyldichloroethylene (DDE) and dichlorodiphenyldichloroethane (DDD), and this mixture was not found in any healthy woman. After adjusting for covariables, the risk of breast cancer was moderately associated with DDD (OR = 1.008, confidence interval 95% 1.001-1.015, p = 0.024). CONCLUSIONS: This study indicates that healthy women show a very different profile of organochlorine pesticide mixtures than breast cancer patients, suggesting that organochlorine pesticide mixtures could play a relevant role in breast cancer risk.

Polymorphisms of glutathione S-transferase µ and θ, MDR1 and VEGF genes as risk factors of bladder cancer: a case-control study.

OBJECTIVE: The present study was aimed at examining the local distribution of GSTM1, GSTT1, MDR1, and VEGF gene polymorphisms as possible risk factors contributing to the development of bladder cancer among the population from Canary Islands, Spain. MATERIALS AND METHODS: The genotypes were determined by PCR-based methods in a hospital-based case-control study consisting of 119 cases and 110 controls. The socio-demographic and clinicopathologic data were collected, including the smoking habits of the population covered in the study. RESULTS: The observed allelic frequencies were (%): GSTM1-GSTT1, (positive) 54 and (null) 46 in cases, and 65 and 35, respectively, in controls (P = 0.144); MDR1 C3435T, (C) 57 and (T) 43 in cases, and 54 and 46, respectively, in controls (P = 0.633); VEGF A2578C, (A) 40 and (C) 60 in cases, and 51 and 49, respectively, in controls (P = 0.221). Among Canary Islands subjects, GSTT1-null genotype appeared as a significant risk factor for bladder cancer (odds ratio (OR) 2.0; 95% confidence interval (CI), 1.0-3.7; P = 0.041), in multivariate analysis adjusted by age and smoking habits. No statistical changes in genotype distribution of GSTM1, MDR1 C3435T, and VEGF A2578C gene polymorphisms were observed between cases and controls. The distribution of the initial clinical stage, clinical grade, or recurrence status was not significantly different among the polymorphic variants in the case group (P = NS). CONCLUSIONS: Subjects with the GSTT1-null genotype might be at an increased risk of bladder cancer in Canary Islands, Spain. However, extensive studies are required for accurate confirmation of these results.

Background levels of polychlorinated biphenyls in the population of the Canary Islands (Spain).

Polychlorinated biphenyls (PCBs) are persistent and toxic compounds that have been detected in human serum or tissues worldwide. The objective of our study was to determine serum PCB levels in a representative sample of the general population of the Spanish Archipelago of the Canary Islands (607 serum samples from subjects aged between 6 and 75 years) in order to establish the main causes of this contamination and to evaluate the potential risks posed by these chemicals on the population through the use of toxicity equivalence to dioxins (TEQs). PCB congeners (28, 52, 77, 81, 101, 105, 114, 118, 123, 126, 138, 153, 156, 157, 167, 169, 180, and 189) were measured by gas chromatography-mass spectrometry (GC/MS). Our results showed that PCB residues were found in 76% of serum samples analyzed, with the congeners 153 and 180 being the most frequently detected and having the highest median values (21.8 and 6.7 ng/g lipid, respectively). Serum levels of non-dioxin-like PCBs increased with age, body mass index (BMI), urban habitat, and smoking. The median concentration of the sum of PCBs considered as markers of environmental contamination by these chemicals (M-PCBs) was 46.4 ng/g lipid. Levels of the sum of dioxin-like PCBs (DL-PCBs) were 48.5 ng/g lipid in the 95th percentile, and were also positively associated with age. As a consequence, age seemed to be positively associated with TEQs levels, reaching values as high as 58.6 pg/g lipid in the serum samples from oldest people. Our results indicate that the inhabitants of the Canary Archipelago show levels of PCB contamination lower than other populations present on the Spanish mainland, as well as many populations from developed countries. Nevertheless, as these compounds may induce adverse health effects even at very low doses, our findings should be considered by local Public Health authorities in order to establish measures for diminishing the exposure of the population of these islands to PCBs.

Finalización electiva versus manejo expectante en el control de la gestación prolongada: estudio prospectivo de 200 gestantes / Elective termination versus expectant management in prolonged pregnancy: a prospective study of 200 pregnant women

Objetivo. Comparar la finalización electiva de la gestación prolongada versus el manejo expectante, en gestaciones de bajo riesgo obstétrico. Material y método. Ensayo clínico controlado y aleatorizado entre actuaciones activas y expectantes, sobre una muestra de 200 mujeres con gestación prolongada de bajo riesgo obstétrico entre febrero de 2003 y junio de 2005 en el Hospital Universitario Materno-Infantil de Canarias. Resultados. El grupo estudio está formado por 200 pacientes - 102 del grupo activa y 98 del grupo expectante -. No se encontraron diferencias epidemiológicas entre ambos grupos. El parto no fue inducido en un porcentaje de gestantes significativamente superior en el grupo activa frente al grupo expectante (51% vs 35,7%, p=0,02; OR 0,53 [CI 95% 0,3-0,94]), es decir, el número de inducciones es significativamente superior en el grupo de manejo expectante. Una tasa significativamente menor de gestantes del grupo activa presentó líquido amniótico meconial durante la dilatación (15,7% vs 28,6% p=0,02; OR 0,47 [IC 95% 0,23-0,93]). No existen diferencias significativas con relación al tipo de parto, no obstante el porcentaje de intervención cesárea fue marcadamente inferior en el grupo activa frente al grupo expectante ([12,7% vs 18,4%, p=0,3; OR 0,65 [IC 95% 0.3-1.41]). Los resultados perinatales no muestran diferencias significativas entre ambos grupos. Conclusiones. La finalización electiva en el semana 42, en gestaciones de bajo riesgo obstétrico con condiciones cervicales desfavorables, parece reducir la tasa de cesáreas sin comprometer los resultados perinatales (AU)

Objective. To compare elective termination versus expectant management in low-risk prolonged pregnancy. Material and method. We performed a controlled randomized clinical trial comparing the results of active and expectant approaches in the management of low-risk prolonged pregnancy in a sample of 200 women between February 2003 and June 2005 at the Maternity Ward of the Canary Islands University Hospital. Results. The study group consisted of 200 patients. There were 102 in the active management group and 98 in the expectant management group. No between-group epidemiologic differences were found. Labor was not induced in a significantly higher proportion of patients in the active than in the expectant group [51% vs 35.7%, p=0.02; OR 0.53 (95% CI 0.3-0.94)] i.e. the induction rate was significantly higher in the expectant group. The proportion of patients with meconium-stained amniotic fluid during labor was significantly lower in the active management group [15.7% vs 28.6% p=0.02; OR 0.47 (95% CI 0.23-0.93)]. No significant differences were found in the type of delivery, although the proportion of cesarean sections was noticeably lower in the active management than in the expectant management group [(12.7% vs 18.4%, p=0.3; OR 0.65 (95% CI 0.3-1.41)]. No significant differences were found in perinatal outcomes between the two groups. Conclusions. Elective termination of low-risk pregnancies with unfavorable cervical findings at week 42 seems to reduce the rate of cesarean section without impairing perinatal outcome (AU)

Tumor mülleriano mixto maligno: la experiencia de un único centro con 43 casos de 1990-2006 / Mixed malignant Mullerian tumours: the experience of a single centre with 43 cases from 1990-2006

Objetivo: Se realiza un estudio descriptivo de las pacientes con diagnóstico de tumor mülleriano mixto maligno (TMMM) en términos de epidemiología, diagnóstico, tratamiento, seguimiento, recurrencias y supervivencia. Material y método: Se revisaron los archivos anatomo-patológicos y las historias médicas de las pacientes tratadas durante el período 1.990-2.006. Las supervivencias se analizan mediante las curvas de Kaplan-Meier. Se emplea un análisis de regresión logística en el estudio uni y multivariable.Resultados43 pacientes son incluidas en esta revisión. El tratamiento inicial fue quirúrgico en el 79% de los casos. El 34,9% de las pacientes se diagnosticaron en estadio I; 16,3% en estadio II; 34,9% en estadio III y 9,3% en estadio IV. Se alcanzó una respuesta completa en el 60,4%. La enfermedad persistió en el 39,6%. La supervivencia libre de enfermedad a los 2, 5 y 10 años fue del 50%, con una mediana de 15 meses (IC 95% 6-32). La tasa de recurrencia fue del 42,3% con un tiempo medio de 8,4 meses. La supervivencia total a los 2, 5 y 10 años fue del 26% con una mediana de 7 meses (IC 95% 1-44). En el análisis univariante el tamaño tumoral, la invasión linfovascular, el estadio y la radioterapia pélvica adyuvante son factores pronósticos. En el análisis multivariante la invasión linfovascular, el estadio y la radioterapia son factores pronósticos independientes. Conclusión: Los TMMM son tumores de comportamiento clínico extremadamente agresivo con un pronóstico pobre. Los factores pronósticos que afectan la supervivencia son el estadio, la invasión linfovascular y la radioterapia pélvica (AU)

Objective: Malignant mixed Müllerian tumours (MMMT) patients were retrospectively evaluated in terms of epidemiology, diagnosis, treatment, follow-up, recurrent disease and survival. Methods: Medical and histopathology records were reviewed during the 17-year period 1990-2006. Survival rates were analysed by means of the Kaplan-Meier technique. The Cox proportional hazards regression model was used in uni- and multivariate analysis. Results: A total of 43 patients were included in this study. First-line treatment was surgery in 79% of cases. Stage I, II, III and IV were identified in 34.9%, 16.3%, 34.9% and 9.3%, respectively. A complete response was achieved in 60.4% of patients. The disease was progressive in 39.6%. Event–free survival at 2, 5 and 10 years was 50% for all, with a median time of 15 months (95% CI,6-32). There was a 42.3% recurrence-rate with a mean time to recurrence of 8.4 months. The 2, 5 and 10-years overall survival was 26% with a median time of 7 months (95% CI, 1-44). In the univariate analysis tumour size, lymphovascular infiltration, stage and pelvic radiotherapy are prognostic factors. In the multivariate analysis lymphovascular infiltration, stage and radiotherapy were found to have an independent influence on overall survival. Conclusions: MMMT are tumours of aggressive clinical behaviour with a poor prognosis. Stage, lymphovascular infiltration and adjuvant radiotherapy are the dominant prognostic factors (AU)