Clinical markers of asthma and IgE assessed in parents before conception predict asthma and hayfever in the offspring.

BACKGROUND: Mice models suggest epigenetic inheritance induced by parental allergic disease activity. However, we know little of how parental disease activity before conception influences offspring's asthma and allergy in humans. OBJECTIVE: We aimed to assess the associations of parental asthma severity, bronchial hyperresponsiveness (BHR), and total and specific IgEs, measured before conception vs. after birth, with offspring asthma and hayfever. METHODS: The study included 4293 participants (mean age 34, 47% men) from the European Community Respiratory Health Survey (ECRHS) with information on asthma symptom severity, BHR, total and specific IgEs from 1991 to 1993, and data on 9100 offspring born 1972-2012. Adjusted relative risk ratios (aRRR) for associations of parental clinical outcome with offspring allergic disease were estimated with multinomial logistic regressions. RESULTS: Offspring asthma with hayfever was more strongly associated with parental BHR and specific IgE measured before conception than after birth [BHR: aRRR = 2.96 (95% CI: 1.92, 4.57) and 1.40 (1.03, 1.91), respectively; specific IgEs: 3.08 (2.13, 4.45) and 1.83 (1.45, 2.31), respectively]. This was confirmed in a sensitivity analysis of a subgroup of offspring aged 11-22 years with information on parental disease activity both before and after birth. CONCLUSION & CLINICAL RELEVANCE: Parental BHR and specific IgE were associated with offspring asthma and hayfever, with the strongest associations observed with clinical assessment before conception as compared to after birth of the child. If the hypothesis is confirmed in other studies, parental disease activity assessed before conception may prove useful for identifying children at risk for developing asthma with hayfever.

Adhesion molecule increases in sleep apnea: beneficial effect of positive airway pressure and moderation by obesity.

BACKGROUND: Elevated levels of intercellular adhesion molecule 1 (ICAM-1) and vascular cell adhesion molecule 1 (VCAM-1) may contribute to cardiovascular disease and are associated with obstructive sleep apnea (OSA) and obesity. The relationship between OSA and obesity in determining ICAM-1 and VCAM-1 levels, and the effect of treatment, is unclear. OBJECTIVE: Our aim was to study whether positive airway pressure (PAP) usage resulted in changes in ICAM-1 and VCAM-1 after 2 years within 309 OSA patients from the Icelandic Sleep Apnea Cohort, and determine how obesity affected such changes. SUBJECTS/METHODS: The mean body mass index (BMI) was 32.4±5.1 kg m(-2); subjects had moderate-to-severe OSA (apnea-hypopnea index=45.0±20.2) and 79% were male. There were 177 full PAP users (⩾4 h per night and ⩾20 of last 28 nights), 44 partial (<4 h per night or <20 nights) and 88 nonusers. RESULTS: ICAM-1 (P<0.001) and VCAM-1 (P=0.012) change was significantly different among the PAP groups. The largest ICAM-1 differences were among the most obese subjects (P<0.001). At follow-up, nonusers had increased ICAM-1 compared with decreased levels in full users. All groups had increased VCAM-1, but nonusers had a significantly larger increase than full users. CONCLUSIONS: Within moderate-to-severe OSA patients, PAP usage prevents increases in adhesion molecules observed in nonusers after 2 years. For ICAM-1, the largest effect is in the most obese subjects. As OSA and obesity commonly coexist, the usage of PAP to limit increases in adhesion molecules may decrease the rate of progression of OSA-related cardiovascular disease.

The role of obesity, different fat compartments and sleep apnea severity in circulating leptin levels: the Icelandic Sleep Apnea Cohort study.

OBJECTIVES: To assess whether sleep apnea severity has an independent relationship with leptin levels in blood after adjusting for different measures of obesity and whether the relationship between obstructive sleep apnea (OSA) severity and leptin levels differs depending on obesity level. METHODS: Cross-sectional study of 452 untreated OSA patients (377 males and 75 females), in the Icelandic Sleep Apnea Cohort (ISAC), age 54.3±10.6 (mean±s.d.), body mass index (BMI) 32.7±5.3 kg m(-2) and apnea-hypopnea index 40.2±16.1 events per h. A sleep study and magnetic resonance imaging of abdominal visceral and subcutaneous fat volume were performed, as well as fasting serum morning leptin levels were measured. RESULTS: Leptin levels were more highly correlated with BMI, total abdominal and subcutaneous fat volume than visceral fat volume per se. No relationship was found between sleep apnea severity and leptin levels, assessed within three BMI groups (BMI <30, BMI 30-35 and BMI > or =35 kg m(-2)). In a multiple linear regression model, adjusted for gender, BMI explained 38.7% of the variance in leptin levels, gender explained 21.2% but OSA severity did not have a significant role and no interaction was found between OSA severity and BMI on leptin levels. However, hypertension had a significant effect on the interaction between OSA severity and obesity (P=0.04). In post-hoc analysis for nonhypertensive OSA subjects (n=249), the association between leptin levels and OSA severity explained a minor but significant variance (3.2%) in leptin levels. This relationship was greatest for nonobese nonhypertensive subjects (significant interaction with obesity level). No relationship of OSA severity and leptin levels was found for hypertensive subjects (n=199). CONCLUSION: Obesity and gender are the dominant determinants of leptin levels. OSA severity is not related to leptin levels except to a minor degree in nonhypertensive nonobese OSA subjects.

Present and future costs of COPD in Iceland and Norway: results from the BOLD study.

The Burden of Obstructive Lung Disease (BOLD) initiative provides standardised estimates of the burden of chronic obstructive pulmonary disease (COPD) worldwide. We estimate the current and future economic burden of COPD in Reykjavik, Iceland and Bergen, Norway using data from the BOLD initiative. Data on utilisation of healthcare resources were gathered from the BOLD survey, existing literature and unit costs from national sources. Economic data were applied to a Markov model using transition probabilities derived from Framingham data. Sensitivity analyses were conducted varying unit costs, utilisation and prevalence of disease. The cost of COPD was 478 euro per patient per yr in Iceland and 284 euro per patient per yr in Norway. The estimated cumulative costs of COPD for the population aged > or = 40 yrs, were 130 million euro and 1,539 million euro for the following 10 yrs in Iceland and Norway, respectively. Costs of COPD accounted for 1.2 and 0.7% of healthcare budgets in Iceland and Norway, respectively. Sensitivity analyses showed estimates were most sensitive to changes in exacerbation frequency. COPD has a significant economic burden in both Iceland and Norway and will grow in the future. Interventions aimed at avoiding exacerbations will have the most impact on costs of COPD over the next 20 yrs.

Sleep and sleep habits from childhood to young adulthood over a 10-year period.

The aim of this epidemiological study was to utilise a cross-sectional as well as a longitudinal approach to examine sleep habits and how they develop in young people in Iceland. The 668 subjects (1-20 years) who responded to a postal survey in 1985 were followed up 5 and 10 years later. The majority of the variance in bedtime and sleep duration was explained by age, but also to a considerable degree by other factors such as residence, season, and year of survey or interaction of these factors. Natural phenomena, such as the diminution of total sleep duration in the first years of life and the tendency for longer sleep on weekends compared to weekdays were confirmed. The lengthening of sleep on weekends was first significant at the age of 9 and was greater among adolescents than young adults. The incidence of daytime sleepiness increased in adolescence, as did napping, at which time their nocturnal sleep time significantly decreased. Over a period of 10 years, a significant shift to earlier wake-up times occurred in children up to 15 years of age, which resulted in a shortened total sleep time. The idea that individual sleep duration is an inherent parameter is supported by the high positive correlation of total sleep time across a 10-year period (r=.73). The present data confirm that Icelandic adolescents (aged 11, 13, and 15) have delayed bedtimes and shorter nocturnal sleep compared to European peers.

[Climateric symptoms and hormone replacement treatment among 50 years old Icelandic women.].

OBJECTIVE: The objective of the research was to estimate the prevalence and treatment of climacteric symptoms among 50 years old women, including which doctors are prescribing the hormone replacement treatment (HRT) and what information is given about the risk and benefit of HRT. MATERIAL AND METHODS: All (n=956) 50 years old women living in Reykjavík and neighbouring towns were included. A detailed questionnaire was posted to the women with two follow-up reminders. A non-response survey was conducted by phone among those not responding. RESULTS: The response rate was 72.2% (n=690). Sleep disturbances were the most common climacteric complaint occurring every day, mainly difficulty in maintaining sleep (14.8%). Hot flushes occuring every day (3.6%) and every night (2.2%) were more common than palpitations occuring every day (0.5%) and every night (0.2%). One fourth of the women had been to a doctor because of anxiety and 17% because of depression. Women who had been oophorectomised, were suffering from insomnia, hypertension, had high body mass index (BMI) or were not on HRT were more likely to suffer from hot flushes and palpitations. More than every other woman was on HRT (54%). Combination of oestrogen and progesterone were most commonly used. Hot flushes were less common in women on HRT and one third reported better sleep after starting HRT. Women on HRT more frequently visited doctors, were more often suffering from anxiety, chronic tiredness, fibromyalgia and pain. They more often were heavy smokers and had chronic bronchitis. Most often the HRT was started by gynaecologists (67%) but continued by family doctors (56%). About one fifth claimed that they had not received information about the risk and benefit of HRT. CONCLUSIONS: More than every other 50 years old woman is on HRT. These women differ in various ways from women not receiving HRT, which underlines the importance of accurate diagnosis and treatment of climacteric symptoms. Better patient information is needed.

Snoring, apneic episodes, and nocturnal hypoxemia among children 6 months to 6 years old. An epidemiologic study of lower limit of prevalence.

STUDY OBJECTIVE: To identify a lower limit of the prevalence of sleep-related breathing disturbances among preschool children. DESIGN: A cross-sectional epidemiologic study in two stages, first by questionnaires and second by whole-night investigation of children symptomatic of the sleep apnea syndrome. SETTING: Gardabaer, a small town, 10 km south of Reykjavìk, Iceland. PARTICIPANTS: All children in Gardabaer, 6 months to 6 years old (n = 555). MEASUREMENTS: Symptom score estimated by questionnaire and respiratory events based on overnight oximetry, thermistors, and a static charge sensitive bed. RESULTS: The response rate was 81.8%. Snoring was reported as often or very often among 14 (3.2%) and occasionally by 73 (16.7%). Apneic episodes were reported often or very often among seven (1.6%). Altogether 18 children were highly suspected of the sleep apnea syndrome because of habitual snoring or apneic episodes. The girls (n = 9) were older than the boys (mean age: 46 +/- 21 months vs 20 +/- 12 months, p < 0.001). Eventually 11 children came for a whole-night investigation and 8 of them showed more than three respiratory events per hour of sleep, associated with > or = 4% oxygen desaturation. The lower limit of the sleep apnea syndrome prevalence among these children was thus 2.9% (SE, 0.5%). CONCLUSIONS: Among children, symptoms such as snoring and apneic episodes are reported relatively seldom, but a high proportion of the children with these symptoms have hypoxic respiratory events.

[Alcohol consumption, smoking and drug abuse among teenagers - a prospective study].

Many of the social and health problems of teenagers today are related to the use of intoxicating drugs. In 1990 the use of Lions Quest began in primary schools in Iceland. With Lions Quest the young are taught life skills in order to be helped to live a healthy life without tobacco, alcohol or other intoxicating drugs. The aim of this study, therefore, was to try to determine what factors influence teenage use of intoxicants and whether the attitudes and drug consumption of those teenagers who had participated in Lions Quest were any different from those who had not. The research is a continuation of a comparative study where students were administered questionnaires to ascertain their attitudes toward life and toward the use of intoxicating substances. In 1989 the survey covered 566 students 12-13 years of age and three years later in 1992 reached 500 of the former respondents when they were 15-16 years old. "The schools were chosen such that the study reflected the attitudes of students both in sparsely and in densely settled areas. The study showed that of the 15-16 year olds 18.6% smoked daily, 44.4% had felt the effects of alcohol four times or more, and 5% had a history of repeated drug abuse (cannabis, sniffing solvents, etc.) The use of various intoxicating substances is strongly correlated, a fact that supports the hypothesis that attitudes toward life and conditions that lead to the use of one type of drug also support the use of other drugs. Those teenagers who used drugs had a great deal in common as regards attitudes toward life and the pattern of family relations. They were not as close to their families as were teenagers who did not use drugs, were seldom home in the evening and had few interests in common with their parents. The parents were more often divorced, smoking in the home was more common and alcohol consumption had more frequently caused family problems. These teenagers were more easily influenced, were more dependent on their friends, had less self-confidence, and were less apt to participate in sports and scouts. Their academic presentation was also lower. There was no significant difference in the level of drug use of teenagers who had participated in Lions Quest and those in the control group. Research in other countries has shown that programs of this kind have succeeded well in preventing drug abuse. The reason why the present study did not show the same result may be because teaching materials of this kind are so new to the Icelandic school system and also because the instructional material had not been given a real place in the legally required curriculum at the time the survey was carried out.

Upper airway infections in preschool children--frequency and risk factors.

OBJECTIVE: To estimate the frequency of upper respiratory tract infections (URTI) over a three month period and possible risk factors in the social surroundings, daily routines and health history. DESIGN: A retrospective epidemiological survey by means of questionnaires. SETTING: Gardabaer, a small town, ten km south of Reykjavík, Iceland. PARTICIPANTS: All children in Gardabaer, six months to six years old (n = 555). MAIN OUTCOME MEASURE: Number of URTI and possible risk factors. RESULTS: The response rate was 81.8%. The most common infections were common cold (n = 345), acute otitis media (n = 82), sore throat (n = 75), and bronchitis (n = 13). The mean frequency of URTI during the previous three months was 2.2 in boys and 1.7 in girls (p < 0.01). Log-linear regression analysis showed that the predicted number of URTI was 1.9 higher if the child was attending day care, and that the number of URTI increased by 1.015 with each month until the age of 24 months, but decreased after that by 0.985. CONCLUSIONS: The major factors which affect the frequency of URTI are: age, sex, family history of frequent URTI, asthma, allergy, and the form of day care. Measures to reduce URTI could involve prospective intervention studies on the form of day care.

Sleep habits and sleep disturbances among the elderly--an epidemiological survey.

OBJECTIVES: To analyse simultaneously sleep habits and sleep disturbances in an elderly population and numerous factors possibly affecting sleep at the same time. DESIGN: A cross-sectional epidemiological survey by means of questionnaires. SETTING: The capital city of Iceland, Reykjavík and surrounding suburbs. PARTICIPANTS: A randomly selected, but stratified sample with 100 men and 100 women in each 5-year age group of the ages 65-84 years--800 individuals altogether. MAIN OUTCOME MEASURE: Sleep habits and sleep disturbances. RESULTS: The mean duration of sleep was 7.25 h (SD 74 min). Mean sleep onset time was 00.13 hours and was not related to age and gender but was delayed at weekends. Daytime napping was reported by 50% of the men and 31% of the women (P < 0.001). Difficulty maintaining sleep (DMS) was the most commonly reported insomnia complaint (men 37% and women 30%). Sleep charts revealed that men woke up an average of 1.2 times per night but women 0.8 times per night (P < 0.01). Difficulty initiating sleep was reported by 9.6% and early morning awakening (EMA) by 16.7%. Pain was a strong factor contributing to EMA. There was also an increase in EMA complaints among the elderly with obstructive pulmonary diseases and systemic hypertension. The prevelance of insomnia was only partly related to age and gender. Multiple regression analyses, however, showed different interrelationships between insomnia and other symptoms and findings for men versus women. CONCLUSION: DMS is the most commonly reported insomnia complaint among the elderly (men 37% and women 30%). The prevalence of insomnia did not increase with age in our study group.

Snoring, hypertension, and the sleep apnea syndrome. An epidemiologic survey of middle-aged women.

The lower limit of the prevalence of sleep apnea syndrome (SAS) was estimated among women 40 to 59 years old by a two-stage procedure. In the first stage 2,016 questionnaires were mailed. The response rate was 75.6 percent. Daytime sleepiness was reported by 8.2 percent, habitual snoring by 11.2 percent, and intermittent snoring by 21.7 percent. There were altogether 128 women described with systemic hypertension and these women were more than twice as often habitual snorers. Logistic multiple regression analyses showed almost a threefold increase in the predicted prevalence of hypertension among intermittent and habitual snorers compared with nonsnorers in the age group 40 to 49 years old and a 60 percent increase in the 50- to 59-year-old age group. In the second stage, a group of 97 women highly suspected of SAS were selected because of their habitual snoring and daytime sleepiness. Eventually, 35 of these came for night studies and 14 were found to have SAS. Among the 35 women, 12 were hypertensive and nine of these had SAS. We estimated the lower limit of the prevalence of SAS to be 2.5 percent for women 40 to 59 years old. It is concluded that SAS is a relatively common occurrence among women, especially postmenopausal ones, and it is strongly related to hypertension.