The principal manifestation of the syndrome is syncope or presyncope, often accompanied by palpitations.

该综合征的主要表现为晕厥或晕厥前，常伴有心悸。

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Objective To analyze the relationship of Qi and blood deficiency syndromes principal components of chronic fatigue syndrome (CFS) and TCM syndrome differentiation.

目的研究慢性疲劳综合征(CFS)气虚证和血虚证的主成分与传统中医辨证的相关性。

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The principal pathophysiological mechanism of acute ischemic coronary syndrome(AICS) is atherosclerotic plaque rupture.

急性冠状动脉综合征发生的主要病理生理机制系粥样斑块破裂。

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Tappin is the principal carer for his wife of 30 years, who has the chronic lung condition Churg-Strauss syndrome.

BBC: Christopher Tappin pleads guilty over weapons charges