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Clinics in endocrinology and metabolism 1984-Nov

Clinical complications of obesity.

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P G Kopelman

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Abstrakt

The development of important respiratory disorders and significant hypertension in association with increasing body weight is not widely recognized. Altered respiratory function results from a combination of mechanical impedance to breathing exerted by thoracic and abdominal fat and a ventilation-perfusion mismatch. Sleep-disordered breathing with periods of hypoventilation, with or without apnoeic episodes, may commonly occur in patients with extreme obesity. Nocturnal hypercapnia and hypoxia in such patients may lead to a decrease in ventilatory drive, abnormal central respiratory control and possibly, in time, the development of the obese-hypoventilation syndrome. Respiratory abnormalities should be suspected in obese patients with a history of restlessness at night, loud snoring and daytime somnolence. Treatment is substantial weight reduction, but short-term measures include the use of compressed air via nasal cannulae for obstructive apnoea, and drugs which alter sleep pattern or stimulate respiration. The alterations in endocrine function, which accompany weight gain, may contribute to an increase in blood pressure and there appears to be a relationship between plasma insulin and catecholamine concentrations, fat cell size and the development of hypertension. The confirmation of a raised blood pressure requires that readings be taken with an adequately sized arm-cuff. In many instances endocrine function becomes normal with weight loss, and there is a corresponding decrease in blood pressure. The ideal management for an obese hypertensive patient is the combination of a suitable calorie-restricted diet with a programme of physical exercise.

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