Mecanismos patogénicos en la enfermedad pulmonar obstructiva crónica causada por exposición a humo de biomasa / Pathogenic Mechanisms in Chronic Obstructive Pulmonary Disease Due to Biomass Smoke Exposure

Las tasas de mortalidad y morbilidad de la enfermedad pulmonar obstructiva crónica (EPOC) han aumentado mundialmente de forma significativa durante las últimas décadas. A pesar de que el humo de tabaco se sigue considerando el principal factor etiopatogénico para el desarrollo de la enfermedad, se estima que entre una tercera y una cuarta parte de los pacientes con EPOC son no fumadores. De todos los factores de riesgo que pueden incrementar la probabilidad de sufrir EPOC en estos sujetos se ha propuesto al humo de biomasa como uno de los más importantes, afectando sobre todo a mujeres y a niños de países emergentes. Aunque existen numerosas evidencias epidemiológicas que relacionan la exposición al humo de biomasa con efectos nocivos para la salud, todavía no se conocen bien los mecanismos celulares y moleculares específicos mediante los cuales este contaminante puede suponer una noxa para los sistemas respiratorio y cardiovascular. En esta revisión se recogen los mecanismos patogénicos propuestos hasta la fecha que sitúan al humo de biomasa como uno de los principales factores de riesgo para la EPOC

Chronic obstructive pulmonary disease (COPD) mortality and morbidity have increased significantly worldwide in recent decades. Although cigarette smoke is still considered the main risk factor for the development of the disease, estimates suggest that between 25% and 33% of COPD patients are nonsmokers. Among the factors that may increase the risk of developing COPD, biomass smoke has been proposed as one of the most important, affecting especially women and children in developing countries. Despite the epidemiological evidence linking exposure to biomass smoke with adverse health effects, the specific cellular and molecular mechanisms by which this pollutant can be harmful for the respiratory and cardiovascular systems remain unclear. In this article we review the main pathogenic mechanisms proposed to date that make biomass smoke one of the major risk factors for COPD

Ventilación no invasiva con presión de soporte con volumen asegurado en un paciente con enfermedad pulmonar obstructiva crónica (EPOC) agudizada / No disponible

El paciente con EPOC exacerbado y encefalopatía hipercápnica puede plantear serios problemas al tratarle con ventilación mecánica no invasiva (VMNI). Aun no siendo una contraindicación para la VMNI, la falta de colaboración puede ser motivo de fracaso de la técnica. En la actualidad disponemos de modos ventilatorios limitados por presión que aseguran el volumen corriente aportado al paciente. El modo presión de soporte con volumen asegurado (AVAPS) nos ofrece esta opción. Existen pocas publicaciones sobre el uso de esta modalidad ventilatoria en la situación de fallo respiratorio agudo hipercápnico. Presentamos el caso de un paciente con EPOC exacerbado en situación de encefalopatía hipercápnica, tratado con éxito con este modo ventilatorio

The patient with exacerbated COPD and hypercapnic encephalopathy may pose serious problems regarding treatment with non-invasive mechanical ventilation (NIMV). Although no contraindication has been found for NIMV, lack of collaboration may be a reason for failure of the technique. We currently have ventilatory methods limited by the pressure that ensures the tidal volume provided to the patient. The average volume assured pressure support (AVAPS) offers us this option. There are few publications on the use of this ventilatory modality when there is acute hypercapnic respiratory failure. We present the case of a male patient with exacerbated COPD with hypercapnic encephalopathy who was successfully treated with this ventilatory mode

Supporting health behaviour change in chronic obstructive pulmonary disease with telephone health-mentoring: insights from a qualitative study.

BACKGROUND: Adoption and maintenance of healthy behaviours is pivotal to chronic disease self-management as this influences disease progression and impact. This qualitative study investigated health behaviour changes adopted by participants with moderate or severe chronic obstructive pulmonary disease (COPD) recruited to a randomised controlled study of telephone-delivered health-mentoring. METHODS: Community nurses trained as health-mentors used a patient-centred approach with COPD patients recruited in general practice to facilitate behaviour change, using a framework of health behaviours; 'SNAPPS' Smoking, Nutrition, Alcohol, Physical activity, Psychosocial well-being, and Symptom management, through regular phone calls over 12 months. Semi-structured interviews in a purposive sample sought feedback on mentoring and behaviour changes adopted. Interviews were analysed using iterative thematic and interpretative content approaches by two investigators. RESULTS: Of 90 participants allocated to health-mentoring, 65 (72%) were invited for interview at 12-month follow up. The 44 interviewees, 75% with moderate COPD, had a median of 13 mentor contacts over 12 months, range 5-20. Interviewed participants (n=44, 55% male, 43% current smokers, 75% moderate COPD) were representative of the total group with a mean age 65 years while 82% had at least one additional co-morbid chronic condition. Telephone delivery was highly acceptable and enabled good rapport. Participants rated 'being listened to by a caring health professional' as very valuable. Three participant groups were identified by attitude to health behaviour change: 14 (32%) actively making changes; 18 (41%) open to and making some changes and 12 (27%) more resistant to change. COPD severity or current smoking status was not related to group category. Mentoring increased awareness of COPD effects, helping develop and personalise behaviour change strategies, even by those not actively making changes. Physical activity was targeted by 43 (98%) participants and smoking by 14 (74%) current smokers with 21% reporting quitting. Motivation to maintain changes was increased by mentor support. CONCLUSIONS: Telephone delivery of health-mentoring is feasible and acceptable to people with COPD in primary care. Health behaviours targeted by this population, mostly with moderate disease, were mainly physical activity and smoking reduction or cessation. Health-mentoring increased motivation and assisted people to develop strategies for making and sustaining beneficial change. TRIAL REGISTRATION: ACTR12608000112368.

Home care by outreach nursing for chronic obstructive pulmonary disease.

BACKGROUND: Chronic obstructive pulmonary disease (COPD) is characterised by progressive airflow obstruction, worsening exercise performance and health deterioration. It is associated with significant morbidity, mortality and health system burden. OBJECTIVES: To evaluate the effectiveness of outreach respiratory health care worker programmes for COPD patients in terms of improving lung function, exercise tolerance and health related quality of life (HRQL) of patient and carer, and reducing mortality and medical service utilisation. SEARCH METHODS: The Cochrane Airways Group Specialised Register of Trials was searched (November 2011). Study references were hand-searched for additional studies we contacted study authors to identify other unpublished studies. SELECTION CRITERIA: We included only randomised controlled trials of COPD patients. We included interventions involving an outreach nurse visiting patients in their homes, providing support, education, monitoring health and liaising with physicians. Studies in which the therapeutic intervention under test was physical training were not included. DATA COLLECTION AND ANALYSIS: Two reviewers independently assessed trial quality and extracted data. We contacted study authors for additional information. MAIN RESULTS: We pooled mortality data from eight studies and found a non-significant reduction in mortality at 12 months (OR 0.72, 95% CI 0.45 to, 1.15).We pooled four studies that assessed disease-specific heath-related quality of life (HRQL) and found a statistically significant improvement in HRQL (mean difference -2.61, 95% CI -4.82 to -0.40).Hospitalisations were reported in five studies. Although there was no statistically significant difference in the number of hospitalisations (OR 1.01, 95% CI 0.71 to 1.44), there was significant heterogeneity. Although this heterogeneity appeared to be caused by one outlying study with a statistically significant decrease in hospitalisations in patients receiving home care, whereas the other studies showed a non-significant increase in hospitalisations, we could not draw firm conclusions about why this heterogeneity exists. Data on GP visits and emergency department presentations were available, however no consistent effect in these was observed with the intervention. The intervention also incurred higher health care costs than standard care as reported in a single study.Very few studies provided data on lung function or exercise performance, so there was insufficient evidence to assess impact on these outcomes. AUTHORS' CONCLUSIONS: Outreach nursing programmes for COPD improved disease-specific HRQL. However the effect on hospitalisations was heterogeneous, reducing admissions in one study, but increasing them in others, therefore we could not draw firm conclusions for this outcome.

Home care by outreach nursing for chronic obstructive pulmonary disease.

BACKGROUND: Chronic obstructive pulmonary disease (COPD) is characterised by progressive airflow obstruction, worsening exercise performance and health deterioration. It is associated with significant morbidity, mortality and health system burden. OBJECTIVES: To evaluate the effectiveness of outreach respiratory health care worker programmes for COPD patients in terms of improving lung function, exercise tolerance and health related quality of life (HRQL) of patient and carer, and reducing mortality and medical service utilisation. SEARCH STRATEGY: The Cochrane Airways Group Specialised Register of Trials was searched (November 2009). Study references were hand-searched for additional studies we contacted study authors to identify other unpublished studies. SELECTION CRITERIA: We included only randomised controlled trials of COPD patients. We included interventions involving an outreach nurse visiting patients in their homes, providing support, education, monitoring health and liaising with physicians. Studies in which the therapeutic intervention under test was physical training were not included. DATA COLLECTION AND ANALYSIS: Two reviewers independently assessed trial quality and extracted data. We contacted study authors for additional information. MAIN RESULTS: We included five new studies in this update, resulting in a total of nine included studies.We pooled mortality data from eight studies and found a non-significant reduction in mortality at 12 months (OR 0.72, 95% CI 0.45 to, 1.15).We pooled four studies that assessed disease-specific heath-related quality of life (HRQL) and found a statistically significant improvement in HRQL (mean difference -2.61, 95% CI -4.82 to -0.40).Hospitalisations were reported in five studies. Although there was no statistically significant difference in the number of hospitalisations (OR 1.01, 95% CI 0.71 to 1.44), there was significant heterogeneity. Although this heterogeneity appeared to be caused by one outlying study with a statistically significant decrease in hospitalisations in patients receiving home care, whereas the other studies showed a non-significant increase in hospitalisations, we could not draw firm conclusions about why this heterogeneity exists. Data on GP visits and emergency department presentations were available, however no consistent effect in these was observed with the intervention. The intervention also incurred higher health care costs than standard care as reported in a single study.Very few studies provided data on lung function or exercise performance, so there was insufficient evidence to assess impact on these outcomes. AUTHORS' CONCLUSIONS: Outreach nursing programmes for COPD improved disease-specific HRQL. However the effect on hospitalisations was heterogeneous, reducing admissions in one study, but increasing them in others, therefore we could not draw firm conclusions for this outcome.

[Recent indications for home oxygen therapy]. / Wspólczesne wskazania do domowego leczenia tlenem.

Home oxygen therapy is a treating method with an effect on improving the life comfort and long of life in the group of patients suffered from non-neoplasmic lung diseases complicated by partial respiratory failure, proved in many clinical trials according to some estimations the number of patients in Poland who fulfill home oxygen therapy qualification's criteria is twice higher then the number of patients who benefit from this method of therapy. This situation should make pneumonologists concern with problems of patients suffered from the respiratory failure who need this kind of therapy.

Cost-effectiveness of educational outreach to primary care nurses to increase tuberculosis case detection and improve respiratory care: economic evaluation alongside a randomised trial.

OBJECTIVE: To evaluate the cost-effectiveness of an educational outreach intervention to improve primary respiratory care by South African nurses. METHODS: Cost-effectiveness analysis alongside a pragmatic cluster randomised controlled trial, with individual patient data. The intervention, the Practical Approach to Lung Health in South Africa (PALSA), comprised educational outreach based on syndromic clinical practice guidelines for tuberculosis, asthma, chronic obstructive pulmonary disease, pneumonia and other respiratory diseases. The study included 1999 patients aged 15 or over with cough or difficult breathing, attending 40 primary care clinics staffed by nurses in the Free State province. They were interviewed at first presentation, and 1856 (93%) were interviewed 3 months later. RESULTS: The intervention increased the tuberculosis case detection rate by 2.2% and increased the proportion of patients appropriately managed (that is, diagnosed with tuberculosis or prescribed an inhaled corticosteroid for asthma or referred with indicators of severe disease) by 10%. It costs the health service $68 more for each extra patient diagnosed with tuberculosis and $15 more for every extra patient appropriately managed. Analyses were most sensitive to assumptions about how long training was effective for and to inclusion of household and tuberculosis treatment costs. CONCLUSION: This educational outreach method was more effective and more costly than usual training in improving tuberculosis, asthma and urgent respiratory care. The extra cost of increasing tuberculosis case detection was comparable to current costs of passive case detection. The syndromic approach increased cost-effectiveness by also improving care of other conditions. This educational intervention was sustainable, reaching thousands of health workers and hundreds of clinics since the trial.

Effect of educational outreach to nurses on tuberculosis case detection and primary care of respiratory illness: pragmatic cluster randomised controlled trial.

OBJECTIVES: To develop and implement an educational outreach programme for the integrated case management of priority respiratory diseases (practical approach to lung health in South Africa; PALSA) and to evaluate its effects on respiratory care and detection of tuberculosis among adults attending primary care clinics. DESIGN: Pragmatic cluster randomised controlled trial, with clinics as the unit of randomisation. SETTING: 40 primary care clinics, staffed by nurse practitioners, in the Free State province, South Africa. PARTICIPANTS: 1999 patients aged 15 or over with cough or difficult breathing (1000 in intervention clinics, 999 in control clinics). INTERVENTION: Between two and six educational outreach sessions delivered to nurse practitioners by usual trainers from the health department. The emphasis was on key messages drawn from the customised clinical practice guideline for the outreach programme, with illustrative support materials. MAIN OUTCOME MEASURES: Sputum screening for tuberculosis, tuberculosis case detection, inhaled corticosteroid prescriptions for obstructive lung disease, and antibiotic prescriptions for respiratory tract infections. RESULTS: All clinics and almost all patients (92.8%, 1856/1999) completed the trial. Although sputum testing for tuberculosis was similar between the groups (22.6% in outreach group v 19.3% in control group; odds ratio 1.22, 95% confidence interval 0.83 to 1.80), the case detection of tuberculosis was higher in the outreach group (6.4% v 3.8%; 1.72, 1.04 to 2.85). Prescriptions for inhaled corticosteroids were also higher (13.7% v 7.7%; 1.90, 1.14 to 3.18) but the number of antibiotic prescriptions was similar (39.7% v 39.4%; 1.01, 0.74 to 1.38). CONCLUSIONS: Combining educational outreach with integrated case management provides a promising model for improving quality of care and control of priority respiratory diseases, without extra staff, in resource poor settings. TRIAL REGISTRATION: Current controlled trials ISRCTN13438073.

Health professionals' responses to the introduction of a home telehealth service.

An ethnographic (participant observation) study was undertaken of the socio-technical processes involved in the implementation, within a randomized controlled trial, of a home telehealth nursing service for patients with chronic obstructive pulmonary disease (COPD). Ethnographic field notes were taken about technology-related tasks and the interplay between the research team and the 12 nurses who were to use the telehealth equipment. Views of the technology were linked to views of professional self-image and status. The technology was sometimes seen as unhelpful in establishing effective relationships with patients. Considerable work by all participants, over a period of months, was required to develop the technology in ways that minimized the risk to the stability of the specialist service and existing nurse-patient relationships. Our work highlights the complex problems that health professionals encounter when they try to integrate new technologies into routine service delivery. The concerns arising from the interplay of new technology with existing professional practices and relationships go beyond simple issues of training.

Evaluación de la utilización de la administración de fármacos mediante la técnica de inhalación / Evaluation of drug administration using inhalation techniques

El objetivo de este estudio fue evaluar el grado de conocimiento de la técnica de inhalación en atención primaria e identificar los pasos en los que se cometen más errores. Se estudió a 93 pacientes revisando la técnica, siguiendo recomendaciones nacionales, que fue incorrecta en el 80,65 por ciento de los casos. El error más frecuente fue "no realizar la espiración lentamente y esperar 30 s para la siguiente dosis". El sistema con mejores resultados fue el dispositivo de polvo seco.Se concluye que existe un elevado número de pacientes que realizan incorrectamente la técnica de inhalación, y se considera imprescindible el desarrollo de programas de educación sanitaria que incidan sobre los errores detectados durante el análisis (AU)

Home care by outreach nursing for chronic obstructive pulmonary disease.

BACKGROUND: Chronic obstructive pulmonary disease (COPD) is characterised by progressive airflow obstruction, worsening exercise performance and deterioration in health. It is associated with significant morbidity, mortality and costs to health care systems. Care strategies, such as outreach nursing in the community, may reduce this burden. OBJECTIVES: To evaluate the effectiveness of outreach respiratory health care worker programmes for patients with COPD in terms of improving lung function, exercise tolerance and health related quality of life (HRQL) of patient and carer, and reducing mortality and hospital service utilisation. SEARCH STRATEGY: A search was carried out using the Cochrane Airways Group database. Bibliographies of identified RCTs were searched for additional relevant RCTs. Authors of identified RCTS were contacted for other published and unpublished studies. SELECTION CRITERIA: Only randomised control trials of patients with COPD were included. The intervention was an outreach nurse visiting patients in their homes, providing support, education, monitoring patient status and providing liaison with physicians. Interventions that used nurse practitioners who provided therapeutic intervention were also included. Studies in which the therapeutic intervention under test was physical training were not included. DATA COLLECTION AND ANALYSIS: Data extraction and study quality assessment were performed independently by two reviewers. Where further or missing data was required, authors of studies were contacted. MAIN RESULTS: Four studies were found. Three assessed mortality following twelve months of care (n=96, 152 and 301), and one after seven months(n=75). Meta-analysis demonstrated that mortality was not significantly reduced by the intervention, Peto Odds Ratio 0.72; 95 % confidence interval 0.43, 1.21. Post hoc subgroup analysis suggested that mortality was reduced by the outreach nursing programme in patients with less severe disease. Significant improvements in health related quality of life were reported in one study in moderate COPD, but not in a study in patients with severe disease. No changes in lung function or exercise performance were found in the studies where data were available. Hospital admissions were reported in only one study in patients with severe disease and no benefit was observed. A further search was conducted in July 2000 did not yield any more studies for inclusion. REVIEWER'S CONCLUSIONS: Patients with moderate COPD may have mortality and health related quality of life gains from a nursing outreach programme, but there are no data about reductions in hospital utilisation. Patients with severe COPD do not appear to have benefit from such programmes and one large study found no reduction in hospital admissions in such patients.

Do you really listen to patients?

Effective communication with patients starts with active listening. Tune in to the meanings behind their words, as well as their nonverbal cues, so you can understand their mindset and adjust your communication style accordingly.

Alteraciones anatomopatológicos y mecanismos fisiopatológicos en la enfermedad pulmor obstructiva crónica. Monografía / Anatomicopathological alterations and physiopathological mechanisms in the chronic pulmonary obstructive disease. Monograph

Resumiendo, puede afirmarse que el aumento de la resistencia al flujo aereo en la EPOC es debido a un engrosamiento mural de los bronquios por el estado inflamatorio propio de la bronquitis crónica como consecuencia de la irritación causada por el humo del tabaco con contracción de la capa muscular de la pared bronquial mediada por sustancias como la endotelina 1, lo que provoca una disminución del calibre de la luz, y a la pérdida de la elasticidad pulmonar y la destrucción alveolar causadas por el enfisema, lo que se traduce por un aumento en los volúmenes estáticos pulmonares, con aumento del volumen residual. Esta alteraciones funcionales y anatómicas conducen a un estado de ventilación ineficiente con alteraciones en la relación ventilación/perfusión (V/Q). La destrucción acinar es responsable de unidades alveolares con ventilación efectiva disminuida, por lo que en estas unidades hay más perfusión que ventilación (V/Q<1), lo que conduce a hipoxemia e hipercapnia; la destrucción alveolar mural también disminuye la superficie efectiva para el intercambio gaseoso, lo que es causa de más hipoxemia e hipercapnia. Por otro lado, el enfisema también provoca alteraciones en los vasos arteriolares alveolares, con destrucción de la red capilar, lo que hace que haya más ventilación que perfusión (V/Q>1), lo que se traduce en un aumento del espacio muerto fisiológico, con disminución de la eficacia ventilatoria. Ambas situaciones aparecen simultáneamente y son responsables de la hipercapnia y de la hipoxemia características de pacientes con EPOC. Además, el desequilibrio en las relaciones V/Q repercuten negativamente sobre la mecánica pulmonar al obligar al paciente a aumentar la frecuencia respiratoria y el flujo aereo, con disminución del tiempo inspiratorio y prolongación del espiratorio, lo que conducirá a la larga mediante mecanismos de fatiga muscular al fallo de bomba respiratoria, con hipoventilación e hipercapnia. En última instancia, la contracción arteriolar causada por la hipoxia conduce a un aumento de las presiones pulmonares, lo que puede desencadenar un cor pulmonale...

Noninvasive ventilation for acute respiratory failure. Quite low time consumption for nurses.

Methods of noninvasive pressure support ventilation (NIPSV) are not always easy to apply in patients with acute exacerbations of chronic obstructive pulmonary disease (COPD). The assistance time spent by nurses in relation to ventilatory time was prospectively studied, when NIPSV was used, in a sequential mode, in COPD patients with either acute exacerbations (58 patients, group I) or postextubation hypercapnic respiratory insufficiency (42 patients, group II) in a medical intensive care unit. During the first 24 h after enrolment, NIPSV was used for 6.7+/-3.2 h (mean+/-SD) in group I and 5.6+/-3.1 h in group II; the duration of NIPSV sessions and the nurse time consumption per session were respectively 47+/-12 and 11+/-7 min in group 1, and 46+/-12 and 11+/-6 min in group II. After the first 24 h of the study, the duration of NIPSV was 4.7+/-3.2 h x day(-1) in group I and 4.9+/-3.5 h x day(-1) in group II, and the nurse time consumption dropped significantly: the duration of NIPSV sessions and the nurse time consumption per session were respectively 44+/-10 and 7+/-4 min in group I, and 47+/-14 and 7+/-3 min in group II. Between the first 24 h and the subsequent period of 24 h, the nursing time dropped significantly (98 versus 59 min in group I (p<0.05), and 85 versus 52 min in group II (p<0.05)). There was no difference in the duration of NIPSV sessions, or in the overall assistance time per session, between the two groups of patients. In conclusion, the study seems to favour a quite low assistance time spent by nurses in relation to ventilatory time when noninvasive pressure support ventilation is used in chronic obstructive pulmonary disease patients with either acute exacerbations or postextubation hypercapnic respiratory insufficiency.

COPD: focus on prevention: recommendations of the National Lung Health Education Program. Chronic obstructive pulmonary disease.

The purpose of this article is to provide the nurse in primary care with an overview of the National Lung Health Education Program guidelines. We outline the components of the guidelines for spirometry testing in persons at risk for chronic obstructive pulmonary disease. The role of spirometry testing in identifying those persons for whom smoking cessation is crucial is emphasized.

Early discharge for patients with exacerbations of chronic obstructive pulmonary disease: a randomized controlled trial.

BACKGROUND: We have previously reported the use of a hospital based respiratory nurse service (Acute Respiratory Assessment Service, ARAS) to support home treatment of patients with exacerbations of chronic obstructive pulmonary disease (COPD). A controlled trial was undertaken to compare early discharge with home treatment supported by respiratory nurses with conventional hospital management of patients admitted with exacerbations of COPD. METHODS: Patients with COPD admitted as emergencies were identified the next working day. They were eligible for inclusion in the study if the differential diagnosis included an exacerbation of COPD, but were excluded if other medical conditions or acidotic respiratory failure required inpatient investigation or management. Of 360 patients reviewed, 209 were being assessed for other active medical problems and were excluded, 33 potential participants were already involved in research studies and so were ineligible, and 37 did not wish to participate in the study. Eighty one patients were randomised to receive conventional inpatient care (n=40) or to planned early discharge the next working day (n=41). Those discharged early continued treatment at home under the supervision of specialist respiratory nurses. Outcome measures were readmission, additional hospital days, and deaths within 60 days of initial admission. Process measures included number of visits, duration of follow up by the respiratory nurse, and additional treatment provided to support early discharge. RESULTS: On an intention to treat basis, a policy of early discharge reduced inpatient stay from a mean of 6.1 (range 1-13) days with conventional management to 3.2 (1-16) days with an early discharge policy. Twelve patients (30% conventional management, 29.3% early discharge) were readmitted in each group giving a mean difference in readmission of 0.7% (95% CI of the difference -19.2 to 20.6). In the conventional management group readmitted patients spent a mean of 8.75 additional days in hospital compared with 7.83 days in the early discharge group, giving a mean difference of 0.92 days (95% CI of the difference -6.5 to 8.3). There were two deaths (5%) in the conventional management group and one (2.4%) in the early discharge group, a mean difference of 2.6% (95% CI of the difference -5.7 to 10.8). CONCLUSIONS: Patients with acute exacerbations of COPD uncomplicated by acidotic respiratory failure or other medical problems can be discharged home earlier than is current practice with support by visiting respiratory nurses. No difference was found in the subsequent need for readmission.