呼吸困难是心力衰竭的常见症状,特别是左心室衰竭的病人,在病的早期主观上感到呼吸困难,总感室内空气不够要求开窗,或稍有活动,如上楼、步行1～2里路就觉呼吸困难,要停下来稍事休息。这是因为左心衰时,肺静脉回血阻力增加,因肺毛细血管充血挤压肺泡使其弹性变差,组织趋于僵硬,顺应性降低,此时呼吸作功增加,空气流通阻力也加大,可能通过神经反射使病人觉得呼吸困难,这就是通常所说的海贝反射(Hering-Brener反射)。其实这一假说从未在人身上得到证实。肺血管充血,肺泡内张力增加,刺激肺牵张感受器对呼吸也可产生影响。随着心力衰竭 Dyspnea is a common symptom of heart failure, especially in patients with left ventricular failure, subjective feeling of breathing difficulties in the early stages of the disease, the general feeling of indoor air is not enough to open the window, or a little activity, such as upstairs, walking 1 to 2 miles I feel difficulty breathing, to stop and take a break. This is because the left heart failure, the pulmonary venous return resistance increased due to pulmonary capillary congestion of the alveolar compression to the elasticity of the deterioration, the organization tends to be stiff, reduced compliance, this time increased breathing work, air circulation resistance also increased, The patient may feel dyspnea through reflexes, which is what is commonly referred to as Hering-Brener reflex. In fact, this hypothesis has never been confirmed in people. Pulmonary vascular congestion, increased alveolar tension, stimulation of lung stretch receptors can also have an impact on breathing. With heart failure