What is palpable systolic thrill in context of mitral regurgitation
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mitral regurgitation systolic thrill physical examination guideline
A palpable systolic thrill is a vibration felt by placing the hand on the chest while the heart contracts. It is the tactile equivalent of a very loud systolic murmur, produced by turbulent, high-velocity blood flow.
In severe mitral regurgitation (MR), it may be felt best over the cardiac apex. During systole, blood leaks backward from the left ventricle into the left atrium through an incompetent mitral valve; if the flow is sufficiently turbulent, the vibration reaches the chest wall.
Clinical meaning:
- It suggests a loud murmur, usually grade 4/6 or higher.
- In MR, it raises concern for significant or severe regurgitation, but does not by itself quantify severity. Echocardiography is required for that.
- The usual MR murmur is holosystolic, heard best at the apex and often radiates toward the left axilla.
Textbook support: a systolic thrill may be palpable at the apex in severe MR, and a systolic thrill or holosystolic murmur increases the likelihood of moderate-to-severe MR (Fuster and Hurst's The Heart, 15th ed.; Goldman-Cecil Medicine). The MSD Manual overview of MR describes the characteristic apical holosystolic murmur and confirms echocardiography as the diagnostic assessment.
What is carotid thrill in context of aortic stenosis
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aortic stenosis carotid thrill physical examination
A carotid thrill is a coarse vibration felt over the carotid artery in the neck during systole.
In aortic stenosis, the narrowed aortic valve causes high-velocity, turbulent ejection of blood from the left ventricle into the aorta. This turbulence produces the classic crescendo-decrescendo systolic murmur and may be transmitted into the carotid arteries as a palpable vibration.
Key points:
- Feel for it gently over the carotid artery, one side at a time.
- It is usually associated with a loud ejection systolic murmur that radiates to the neck.
- Its presence supports significant aortic stenosis, but severity must be assessed by echocardiography.
- The more typical accompanying carotid pulse in severe AS is slow-rising and low-volume, called pulsus parvus et tardus.
Do not confuse this with a carotid bruit, which is heard with a stethoscope and often reflects turbulence from carotid artery narrowing rather than from the aortic valve. The thrill of aortic stenosis is often also palpable at the aortic area, near the right upper sternal border.
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