Will the peripheral signs of aortic regurgitation, water hammer pulse, pulsus bisferiens, wide pulse pressure be seen in mild to moderate AR or are they only seen in severe AR?
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"aortic valve insufficiency"[MeSH Terms] AND physical examination
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aortic regurgitation peripheral signs severity wide pulse pressure water hammer pulse guideline
They are primarily features of chronic hemodynamically significant AR, so they are most obvious and classically taught in severe chronic AR.
- Mild AR: usually no peripheral signs. Pulse pressure is often normal, and a water-hammer pulse or pulsus bisferiens would be unusual.
- Moderate AR: wide pulse pressure and bounding/collapsing pulse can begin to appear, especially with a high stroke volume, low systemic vascular resistance, or long-standing disease. Pulsus bisferiens may occur in moderate AR.
- Severe chronic AR: wide pulse pressure, Corrigan/water-hammer pulse, visible carotid pulsation, Quincke, Duroziez, de Musset, etc. are more likely. They reflect substantial regurgitant volume and rapid diastolic runoff.
- Acute severe AR: may not have these signs. The LV has not adapted, forward stroke volume can be low, and pulse pressure may be normal or even narrow.
So the practical answer is: not exclusively severe, but marked peripheral signs strongly suggest significant, usually severe, chronic AR. Their absence does not rule out severe AR.
Specifically, a textbook source notes that pulsus bisferiens may be present in moderate to severe aortic insufficiency (Morgan and Mikhail's Clinical Anesthesiology, 7e, p. 2747-2750). A review likewise states that low diastolic pressure, wide pulse pressure, and bounding pulses appear once AR becomes moderate to severe, while absence of a wide pulse pressure cannot exclude severe AR (review of AR assessment).
In Severe AR the left ventricle fails so the Systolic BP will drop, then how there is bounding pulse, wide pulse pressure in Severe AR
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chronic severe aortic regurgitation low systolic blood pressure heart failure wide pulse pressure hemodynamics
“Severe AR” and “LV failure” are related but not synonymous. The key is the stage of chronic AR.
Compensated severe chronic AR
The LV is markedly dilated with eccentric hypertrophy. It can eject a very large total stroke volume:
[
\text{Total LV stroke volume} = \text{forward stroke volume} + \text{regurgitant volume}
]
Even if a large part leaks back into the LV during diastole, the large ejected volume initially produces a high systolic arterial pressure. Then rapid diastolic runoff back into the LV produces a low diastolic pressure.
So:
[
\text{high SBP} - \text{low DBP} = \text{wide pulse pressure}
]
That large, rapidly rising and rapidly collapsing arterial pulse is the bounding/water-hammer pulse. Chronic AR produces this because the enlarged, hyperdynamic LV ejects a large stroke volume at high pressure (Goldman-Cecil Medicine, Physical Examination, p. 1171-1173).
Decompensated end-stage severe chronic AR
Later, contractility declines and effective forward stroke volume falls. SBP may then fall, hypotension can occur, and the classical bounding pulse/wide pulse pressure may become less prominent or disappear. This is true LV pump failure.
Acute severe AR
Here the LV has no time to dilate or compensate. LV end-diastolic pressure rises abruptly, forward stroke volume falls, and the pulse pressure is often normal or narrow, with hypotension/shock. Therefore, a water-hammer pulse is usually absent.
| Situation | SBP | DBP | Pulse pressure / pulse |
|---|---|---|---|
| Severe chronic AR, compensated | Often high | Low | Wide, bounding |
| Severe chronic AR, late decompensation | May fall | Low or variable | May narrow, weak pulse possible |
| Acute severe AR | Often low | Variable | Often normal/narrow, not bounding |
So do not equate severe AR with low SBP. In the usual examination-vignette form of chronic severe AR, the LV is still generating a huge stroke volume, hence high SBP, low DBP, and bounding pulse. Low SBP signifies the later decompensated or acute setting, where the traditional peripheral signs can be absent. This contrast is also described in the MSD Manual discussion of chronic versus acute AR.
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