PURPOSE: Neck circumference has been found to be an independent predictor of obstructive sleep apnea-hypopnea syndrome (OSAHS) in obese patients. The purpose of this work was to study neck circumference in chronic obstructive pulmonary disease (COPD) patients in order to predict obstructive sleep apnea-hypopnea syndrome.
METHODS: DESIGN: Cross-sectional study. SETTING: Referral sleep laboratory of Vallabhbhai Patel Chest Institute, Delhi University, Delhi, India. PATIENTS: 50 eligible patients with a diagnosis of COPD. The diagnosis of COPD was made on the basis of medical history, suggestive signs and symptoms, chest skiagram, pulmonary function tests. MEASUREMENTS: Neck circumference was measured at the level of cricothyroid membrane. Whole night polysomnography (Medcare polygraph, Medcare Flaga, Reykjavik, Iceland) was done in all the patients. Cut-off values for neck circumference was taken as 43 cm. OSAHS was defined as apnea-hypopnea index (AHI) of more than 5 per hour.
RESULTS: None of the patients with high AHI had neck circumference > 43cm (p=1.000).
CONCLUSION: The sensitivity of neck circumference in predicting the risk of OSAHS in COPD patients is very low.
CLINICAL IMPLICATIONS: Neck circumference can not be used as a screening test for prediction of OSAHS in COPD patients.
DISCLOSURE: Amit Bansal, No Financial Disclosure Information; No Product/Research Disclosure Information