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August 28, 1967JAMA

The Delay in the Korotkoff Sounds in Left Bundle-Branch Block

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Why the study?

Does left bundle-branch block delay the appearance of Korotkoff sounds relative to the QRS complex in patients with cardiac disease?

Population

30 patients with cardiac disease and normal subjects

Comparison

Measurement of the timing of the Korotkoff… vs Normal subjects and periods of normal conduction…

Design

Cross-sectional

Authors

ALAlbert J. LibanoffCity Of Hope National Medical Center

Discussion

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Implication

LBBB may confound Korotkoff-based BP timing; hypothesis-generating for measurement adjustments in conduction disease.

Structured PICO

Does left bundle-branch block delay the appearance of Korotkoff sounds relative to the QRS complex in patients with cardiac disease?

P
Population
30 patients with cardiac disease (including arteriosclerosis, subaortic muscular stenosis, and myocardiopathies) and normal subjects
I
Intervention
Measurement of the timing of the Korotkoff sounds in the brachial artery at diastolic pressure (QKd) relative to the onset of the QRS complex
C
Comparator
Normal subjects and periods of normal conduction in patients with intermittent left bundle-branch block
O
Outcome
Timing of the Korotkoff sounds in the brachial artery at diastolic pressure (QKd) following the onset of the QRS complexsurrogate

Left bundle-branch block is associated with a significant electromechanical delay, reflected by a 40 to 90 msec delay in the appearance of Korotkoff sounds at diastolic pressure.

Cite This Study

Albert J. Libanoff (1967) studied this question.

synapsesocial.com/papers/69ffccb5d1d8b50f8e9a1308https://doi.org/10.1001/jama.1967.03130090030007
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