Even after adjustment in multivariate analysis, women with acute myocardial infarction still demonstrate a higher risk for in-hospital death than men.

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Twelve patients with chronic respiratory failure in obstructive pulmonary emphysema had a significant increase in plasma catecholamines of about three times the normal values. It is suggested that chronic hypercapnia stimulates the sympathetic nervous system thus being partly responsible for several cardiovascular features as tachycardia, arrhythmia and increased cardiac output often observed in patients with chronic respiratory insufficiency.

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