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气喘是充血性心衰的一个主要特点。心衰得到控制的患者静息时的通气一般正常,但在运动时,其呼吸频率和每分通气量的增加比正常对照者为大。心衰稳定患者的运动能力可受长期药物治疗或运动锻炼的影响。常规吸氧能缓解急性左心衰所致的呼吸困难,但对慢性心衰患者运动量的影响尚未研究。患者和方法 12例慢性充血性心衰患者在次极量和极量运动试验时,吸氧浓度分别在21％(室内空气)、30％和50％的情况下,观察其对心脏、呼吸反应的影响。结果吸氧后最大运动能力持续时间延长,吸入空气时运动持续时间的均值(±SD)为548(±276)
Asthma is a major feature of congestive heart failure. Ventilation at rest was generally normal in patients with congestive heart failure but increased in respiratory rate and minute ventilation during exercise compared with those in normal controls. Patients with stable heart failure exercise capacity can be affected by long-term medical treatment or exercise. Routine oxygen therapy can relieve dyspnea caused by acute left heart failure, but the impact on exercise in patients with chronic heart failure has not been studied. Patients and Methods Twelve patients with chronic congestive heart failure under hypopnea and maximal exercise tests were observed for cardiorespiratory response at 21% (room air), 30% and 50% respectively Impact. Results The duration of maximum exercise capacity after oxygen inhalation was prolonged and the mean ± SD of exercise duration when inhaled was 548 (± 276)