What Pulsus Paradoxus?

Pulsus paradoxus is a medical sign in which the arterial pulse diminishes or disappears during inspiration. It is usually associated with conditions that increase intrathoracic pressure during inspiration, such as cardiac tamponade, pericarditis, restrictive cardiomyopathy, and tension pneumothorax.

Pulsus paradoxus is caused by a decrease in venous return to the heart during inspiration, which leads to a decrease in stroke volume and aortic blood pressure. This decrease in aortic blood pressure is transmitted to the radial artery, resulting in a weaker or消失的pulse.

Pulsus paradoxus is an important clinical sign that can help diagnose conditions that increase intrathoracic pressure and decrease cardiac output. It is typically detected during a physical examination by measuring the blood pressure with a sphygmomanometer. If pulsus paradoxus is present, the blood pressure may be 10 mmHg or more lower during inspiration than during expiration.

Pulsus paradoxus is a serious medical sign that requires prompt evaluation and treatment. If pulsus paradoxus is present, the underlying cause should be identified and treated as soon as possible.