Davies RJ, Ali NJ, Stradling JR: Neck circumference and other clinical features in the diagnosis of the obstructive sleep apnoea syndrome

Osler Chest Unit, Churchill Hospital, Oxford.
Thorax (Impact Factor: 8.29). 03/1992; 47(2):101-5. DOI: 10.1136/thx.47.2.101
Source: PubMed


Neck circumference has been suggested to be more predictive of obstructive sleep apnoea than general obesity, but the statistical validity of this conclusion has been questioned. Combining neck circumference with other signs and symptoms may allow the clinical diagnosis or exclusion of sleep apnoea to be made with reasonable confidence. This study examines these issues.
One hundred and fifty patients referred to a sleep clinic for investigation of sleep related breathing disorders completed a questionnaire covering daytime sleepiness, snoring, driving, and nasal disease. Body mass index and neck circumference corrected for height were measured and obstructive sleep apnoea severity was quantified as number of dips in arterial oxygen saturation (SaO2) of more than 4% per hour of polysomnography. Multiple linear regression was used retrospectively to identify independent predictors of SaO2 dip rate, and the model derived was then prospectively tested in a further 85 subjects.
The retrospective analysis showed that the question "Do you fall asleep during the day, particularly when not busy?" was the best questionnaire predictor of variance in the SaO2 dip rate (r2 = 0.13); no other question improved this correlation. This analysis also showed that neither body mass index nor any of the questionnaire variables improved the amount of variance explained by height corrected neck circumference alone (r2 = 0.35). A statistically similar prospective analysis confirmed this relationship (r2 = 0.38).
Prospective study of these patients referred to a sleep clinic with symptoms suggesting sleep apnoea shows that neck circumference corrected for height is more useful as a predictor of obstructive sleep apnoea than general obesity. None of the questionnaire variables examined add to its predictive power, but alone it is inadequate to avoid the need for sleep studies to diagnose this disease.

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    • "According to a previous study [26], NC is more strongly associated with OSA than is BMI. Specifically, an NC ≥ 17 inches for men and ≥ 16 inches for women were highly correlated with OSA [27]. "
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    ABSTRACT: Obstructive sleep apnea is a common sleep disorder that can cause excessive daytime sleepiness and impairment of cognition. These symptoms may lead to the occurrence of occupational accidents in workers with obstructive sleep apnea. A 36-year-old man who worked as a dimensional control surveyor caused a vehicle accident while he was driving at the work site. Although he experienced loss of consciousness at the time of the accident, he had no other symptoms. His brain computed tomography and laboratory test did not show any specific findings. Medical tests were conducted to evaluate his fitness for work. Decreased sleep latency was observed on the electroencephalography image, which is suggestive of a sleep disorder. He frequently experienced daytime sleepiness and his Epworth sleepiness score was 13. The polysomnography showed a markedly increased apnea-hypopnea index of 84.3, which led to a diagnosis of severe obstructive sleep apnea. The patient was advised to return to work only when his obstructive sleep apnea improved through proper treatment. Proper screening for obstructive sleep apnea among workers is important for preventing workplace accidents caused by this disorder, but screening guidelines have not yet been established in Korea. An effort toward preparing practical guidelines for obstructive sleep apnea is needed.
    04/2014; 26(1):7. DOI:10.1186/2052-4374-26-7
    • "Our finding supports previous studies that showed that neck circumference is an important predictor of obstructive sleep apnea syndrome. Davies et al., in a study of 150 patients referred to a sleep clinic reported that neck circumference corrected for height is a more useful predictor of obstructive sleep apnea than general obesity.21 Stradling and colleagues in an analysis of 1,001 randomly selected middle aged men from the register of a general practice clinic, observed that self-reported snoring correlated best with neck size, smoking and nasal stuffiness. "
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    Journal of the Nigeria Medical Association 03/2014; 55(1):24-8. DOI:10.4103/0300-1652.128154
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    • "They also had a greater actual and normalized neck circumference, although these differences did not reach statistical significance. Increased BMI and neck circumference are both factors that have been associated with OSA in study populations [24], and in studies of SRDB as a risk factor for MVCs in commercial drivers [2,4]. "
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    ABSTRACT: Sleep related disordered breathing (SRDB), is an established risk factor for motor vehicle crashes (MVCs) involving commercial drivers. The role of SRDB in motor vehicle crashes involving non-commercial drivers is not well established. Drivers involved in MVCs who were admitted to an American College of Surgeons accredited Level I trauma center for treatment of their injuries, and who could give informed consent and provide verbal responses to screening questionnaires were eligible for enrolment in this study. Two questionnaires previously validated for screening patients at risk for sleep disturbances (The Epworth Sleepiness Scale (ESS) and The Berlin Questionnaire (BQ)) were administered. Questionnaire results associated with an 85% sensitivity for predicting obstructive sleep apnea were considered positive. In this study we tested the hypothesis that patients at risk for SRDB, as measured by validated questionnaires, are at an increased risk being involved in MVCs. Between March and October 2010, 71 consecutive patients were offered enrolment in this study with 56 agreeing to participate in this study. Six were previously diagnosed with SRDB with only one being compliant and effectively treated at the time of their MVC. Forty-two patients (75%) had responses to the questionnaires that indicated that the patients were at high risk for SRDB. Six patients suffered systemic complications, including pleural effusions, pneumonia and arrhythmias, during their hospitalization with five (83%) having abnormal questionnaire responses indicating that the patient was at high risk for SRDB. The high incidence of positive responses to the sleep questionnaires is consistent with the hypothesis that SRDB is potentially a significant risk factor for MVCs. Furthermore the observation that systemic complications were seen more commonly in those with SRDB, while not unexpected, is a novel observation. Further studies are needed to validate these findings in a larger cohort of patients as well as determining if these patients are truly at a greater risk for systemic complications. If replicated these observations would suggest that effective therapy for disordered sleep could play a significant role in an injury prevention process.
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