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In order to investigate risk factors of ischemic stroke, a matched case-control study with two kinds of controls (community controls and hospital controls) was conducted. The multiple conditional logistic regression analysis showed that hypertension, transient ischemic attacks, alcohol consumption and habitual snoring were independent risk factors of ischemic stroke. Physical activity at leisure time was an important protective factor. No independent relationships were found between cigarette smoking, history of mellitus diabetes or heart diseases, stroke history of father or mother and ischemic stroke.
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PMID:[A study on risk factors of ischemic stroke]. 130 14

In a case-controlled study into the risk factors for admission to hospital with stroke, 400 subjects and 400 age and sex-matched controls were recruited. All bar two subjects were followed until death or 6 months. Previous stroke and regular snoring (p = 0.0013 and p less than 0.0001 respectively) were the only two risk factors adversely to effect mortality. Transient ischaemic attack, ischaemic heart disease, hypertension, atrial fibrillation, diabetes mellitus did not significantly effect prognosis. An apparent beneficial effect of drinking alcohol and smoking became insignificant when the confounding influence of age was taken into account.
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PMID:Effect of the risk factors for stroke on survival. 135 99

In order to evaluate the possible role played by snoring as a risk factor for cardiovascular disease, we studied 400 patients aged 30-80 years, divided into 4 groups matched for age, sex and body mass index. The first group consisted of 100 patients who snored, having risk factors (hypertension, diabetes, obesity, smoking, high serum cholesterol level) for cardiovascular disease. The second group consisted of 100 non-snoring patients with risk factors. The third and fourth groups were formed by 100 snoring and 100 non-snoring patients without risk factors. We investigated the morbidity and the mortality from cardiovascular disease over a period of five years (1982-1987). An increase in morbidity and mortality was found for snorers with risk factors (36 and 17 respectively) compared to non-snorers with risk factors (10 and 4, P less than 0.001), and also to both snorers and non-snorers without risk factors (7 and 3, P less than 0.001; 3 and 1, P less than 0.001 respectively). No difference was noted between snorers and non-snorers without risk factors. A higher morbidity and mortality for cardiovascular disease was found in snorers with risk factors as compared with non-snorers having risk factors. Furthermore, the morbidity and mortality in patients without risk factors was found to be lower compared with that found in snorers with risk factors. In conclusion, snoring worsened the prognosis of patients with risk factors for cardiovascular disease, but did not represent an independent or predictive risk factor in itself.
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PMID:Snoring and risk of cardiovascular disease. 179 Oct 87

We studied 177 consecutive male patients aged 16-60 years with brain infarction verified by neuroradiology and analyzed the time of onset of stroke symptoms related to sleep and the role of possible or known risk factors for brain infarction. Brain infarction occurred relatively more often during the first 30 minutes after awakening than at any other time. In multiple stepwise logistic regression analyses, snoring was the only independent risk factor differentiating stroke occurring during sleep and stroke occurring either during sleep or during the first 30 minutes after awakening from stroke occurring at other times of the day. The risk ratios were 2.65 (95% confidence interval 1.32-5.29, p less than 0.005) and 3.16 (95% confidence interval 1.61-6.22, p less than 0.001), respectively. Other factors tested were age, arterial hypertension, diabetes mellitus, smoking, alcohol consumption, and body mass index. Arterial hypertension seemed to have an additive effect on the independent risk caused by snoring.
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PMID:Snoring as a risk factor for sleep-related brain infarction. 279 62

In a study conducted in four family practice units in Toronto, Canada, 2001 subjects reported on snoring and medical conditions in members of their households. For spouses the prevalence of snoring increased with age up to the seventh decade, with a higher prevalence of nearly 85% in husbands. For 11 medical problems an association existed between snoring, its frequency, and the presence of the condition. This association continued when the data were corrected for sex, age, and marital state. For hypertension both men and women who snored between the fifth and 10th decades had a twofold increase over non-snorers. The prevalence of heart disease and other conditions, except for diabetes and asthma, also increased in snorers in this age group. When corrected for smoking and obesity the association between snoring, hypertension, and heart disease persisted. These findings extend those of Lugaresi et al, and if they could be confirmed snoring as a risk factor for conditions other than sleep apnoea and sleep disorders might be considered. Methods of alleviating the acoustic annoyance of snoring may also provide direct medical benefits.
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PMID:Snoring as a risk factor for disease: an epidemiological survey. 392 56

Patients with noninsulin-dependent diabetes mellitus (NIDDM) are often obese and frequently complain of tiredness. These features are also characteristically seen in patients with obstructive sleep apnea (OSA). Therefore, it was the aim of this study to assess the prevalence of OSA among a group of obese NIDDM patients who have some clinical features of OSA. The effect of reversal of OSA by nasal continuous positive airway pressure (CPAP) treatment on insulin responsiveness was also investigated. From a population of 179 NIDDM patients with a body mass index (BMI) greater than 35 kg/m2, we performed ambulatory sleep monitoring on 31 (15 males and 16 females) who admitted to either heavy snoring or excessive sleepiness. Results were reviewed by a sleep physician blinded to the clinical status of the patients, and 22 (70%) were found to have moderate or severe OSA, with mean oxygen desaturation indexes of 10.3 +/- 5.3 and 30.7 +/- 13.2 episodes/h, respectively. A subgroup of 10 patients (seven males and three females) with a mean BMI of 42.7 +/- 4.3 kg/m2 was treated with nightly CPAP for 4 months. These subjects all had significant OSA, with frequent obstructive apneas (mean, 47 +/- 31.6 episodes/h) and oxygen desaturation (mean minimum O2 saturation, 74 +/- 9.5%), as determined by polysomnography. One patient was excluded from analysis because of infrequent use of CPAP. Insulin responsiveness in terms of glucose disposal measured by hyperinsulinemic euglycemic clamps improved from 11.4 +/- 6.2 to 15.1 +/- 4.6 mumol/kg.min (P < 0.05) during CPAP treatment. These results indicate that OSA occurs commonly in obese NIDDM patients with excessive sleepiness or heavy snoring. Treatment of their OSA may improve insulin responsiveness.
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PMID:Obstructive sleep apnea in obese noninsulin-dependent diabetic patients: effect of continuous positive airway pressure treatment on insulin responsiveness. 798 75

A 60-year-old obese woman was admitted for evaluation of excessive daytime sleepiness, loud snoring, cyanosis, systemic edema, hypertension and diabetes mellitus. Laboratory examination showed severe hypoxemia, hypercapnea, metabolic alkalosis, hypokalemia and hyperaldosteronism. CT scan showed a left adrenal tumor. A diagnosis of obstructive sleep apnea syndrome associated with primary aldosteronism was established. Metabolic alkalosis, hypokalemia and sodium retention due to hyperaldosteronism were thought to be factors exacerbating her sleep apnea.
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PMID:[A case report of obstructive sleep apnea syndrome associated with primary aldosteronism]. 818 53

We wanted to assess habitual snoring as a credible risk factor for acute vascular disease, mainly stroke and myocardial infarction. The patients selected for the study had been admitted to the hospital through the emergency department, and were evaluated by means of multidimensional interviews and clinical records: 164 had acute cerebrovascular disease, and 136 cardiovascular disease; 330 patients with nonvascular disease were the controls. The evaluation showed 48% of vascular disease patients to be habitual snorers, but only 30% of the controls; the difference was statistically significant. Compared with the controls, in the cerebrovascular patients the risk (odds ratio) associated with habitual snoring was significantly increased, and of the same order as the risk associated with age over 65 yrs, male gender, diabetes mellitus, and dyslipidaemia; whilst the risk associated with hypertension was higher. In the cardiovascular patients, the risk associated with habitual snoring was again significantly increased and of the same order as the risk associated with male gender, body mass index > 29 (kg.m-2), dyslipidaemia, heavy smoking, excessive alcohol intake and hypertension. A logistic regression analysis, entering the variables in the following order: age, gender, body mass index, diabetes, dyslipidaemia, smoking, alcohol, hypertension, and habitual snoring, showed that habitual snoring carries a significant risk factor for stroke and myocardial infarction, even after adjusting for other factors. Since habitual snoring carries a definite risk for acute vascular disease, we conclude that inquiring about it should become routine practice.
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PMID:Habitual snoring as a risk factor for acute vascular disease. 828 55

Obstructive sleep apnea (OSA) is a disorder in which there is repetitive collapse and closing of the pharynx during sleep. There is growing evidence to suggest that this disorder is a major cause of essential hypertension (EH) and that successful treatment of OSA can reduce the blood pressure (BP) significantly. In addition many other patients with EH have milder forms of sleep related breathing disorders (SRBD) like snoring, and upper airway resistance syndrome (UARS) which, while not as severe as OSA, may be severe enough to also cause systemic hypertension. We therefore propose a unifying hypothesis-that many patients with EH may have sleep related breathing disturbances (SRBD) and treatment of these disorders may improve the BP. SRBD could also explain many of the epidemiological, clinical, hereditary, biochemical, hematological and physiological characteristics seen in EH. In addition, many types of secondary hypertension (those caused by excessive alcohol intake, chronic renal failure, diabetes, hypothyroidism or acromegaly) have a higher than normal prevalence of OSA and OSA may contribute to the hypertension and organ damage found in these conditions as well. Thus SRBD may play an important role in the production of many cases of essential and secondary hypertension, and their early detection and treatment could reduce the hypertension and organ damage seen in these conditions.
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PMID:Essential and secondary hypertension and sleep-disordered breathing: a unifying hypothesis. 887 97

The objectives of this study were to describe the prevalence of snoring, observed apneas, and daytime sleepiness in older men and women, and to describe the relationships of these sleep disturbances to health status and cardiovascular diseases (CVD). A cross-sectional design was employed to study sleep problems, CVD, general health, psychosocial factors, and medication use. The subjects were participants in the Cardiovascular Health Study, which included 5,201 adults, aged 65 and older, who were recruited from a random sample of Medicare enrollees in four U.S. communities. Study measures employed were sleep questions, echocardiography, carotid ultrasound, resting electrocardiogram, cognitive function, cardiopulmonary symptoms and diseases, depression, independent activities of daily living (IADLs), and benzodiazepine use. Thirty-three percent of the men and 19% of the women reported loud snoring, which was less frequent in those over age 75. Snoring was positively associated with younger age, marital status, and alcohol use in men, and obesity, diabetes, and arthritis in women. Snoring was not associated, however, with cardiovascular risk factors or clinical CVD in men or women. Observed apneas were reported much less frequently (13% of men and 4% women) than snoring, and they were associated with alcohol use, chronic bronchitis, and marital status in men. Observed apneas were associated with depression and diabetes in women. In both men and women, daytime sleepiness was associated with poor health, advanced age, and IADL limitations. The conclusions of the study were that loud snoring, observed apneas, and daytime sleepiness are not associated cross-sectionally with hypertension or prevalent CVD in elderly persons.
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PMID:Prevalence and correlates of snoring and observed apneas in 5,201 older adults. 889 30


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