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Corrigan's sign is a clinical sign observed in patients with certain lung conditions, particularly those that cause airway obstruction. It is named after the Irish physician Dominic John Corrigan, who first described it in the mid-19th century.

When a patient with Corrigan's sign inhales, the chest cavity expands normally, but during exhalation, the chest cavity appears to collapse due to the airway obstruction. This is because the air is not being expelled from the lungs as it normally would be. Instead, the air gets trapped inside the lungs, leading to a phenomenon known as "pulsus paradoxus," where the pulse weakens or disappears during exhalation.

Here's the translation in Chinese:

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Corrigan's sign 是在某些肺部疾病患者身上观察到的一种临床体征，特别是那些导致气道阻塞的疾病。它以19世纪中期首次描述它的爱尔兰医生Dominic John Corrigan的名字命名。

当具有Corrigan's sign的患者吸气时，胸腔正常扩张，但在呼气时，由于气道阻塞，胸腔看起来会塌陷。这是因为空气没有像正常情况下那样从肺部排出。相反，空气被困在肺部内，导致一种称为“呼气性脉搏减弱”的现象，即在呼气期间脉搏减弱或消失。

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Medical Definition of Corrigan pulse. Corrigan pulse: A pulse that is forceful and then suddenly collapses. It is usually found in patients with aortic regurgitation, a condition caused by a leaky aortic valve. The left ventricle of the heart ejects blood under high pressure into the aorta.read more >>