这种劳力性呼吸困难的短期改善是多因素作用的结果，不能通过通气需求和肺气体交换的改变来解释。
These acute improvements in exertional dyspnea are multifactorial and could not be explained by alterations in ventilatory demand or pulmonary gas exchange.
病窦综合征的症状包括：晕厥，头昏，心悸，劳力性呼吸困难，变时性功能不全，心衰，和心绞痛导致的易疲劳。
Symptoms of SSS include: syncope, dizziness, palpitations, exertions dyspnea, fatigability from chronotropic incompetence, heart failure, and angina.
病窦综合征的症状包括：晕厥，头昏，心悸，劳力性呼吸困难，变时性功能不全，心衰，和心绞痛导致的易疲劳。
Symptoms of SSS include: syncope, dizziness, palpitations, exertions dyspnea, fatigability from chronotropic incompetence, heart failure, and angina.
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