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Related Experiment Videos

Korotkoff's sounds in pregnancy

M Quinn1

  • 1Department of Obstetrics & Gynaecology, University Hospital of Wales, Cardiff, UK.

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
|July 1, 1995
PubMed
Summary

Korotkoff sounds during blood pressure measurement are linked to specific brachial artery waveform changes. These vascular sounds, particularly phases I-IV, reflect real-time alterations in blood flow patterns.

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Area of Science:

  • Cardiovascular Physiology
  • Medical Acoustics
  • Diagnostic Ultrasound

Background:

  • Korotkoff sounds are traditionally heard during blood pressure measurement.
  • The origin of these sounds, particularly phases I-V, is often attributed to blood flow turbulence.
  • Understanding the precise relationship between sounds and hemodynamics is crucial for accurate non-invasive BP measurement.

Purpose of the Study:

  • To investigate the correlation between Korotkoff sound phases (I-V) and specific changes in the brachial artery waveform.
  • To determine if vascular sounds are solely due to turbulence or influenced by vessel wall dynamics and flow changes.
  • To provide objective evidence linking acoustic phenomena to hemodynamic events during cuff deflation.

Main Methods:

  • Concurrent Doppler ultrasound (7.5 MHz) and phonocardiography were used in ten pregnant women.
  • Brachial artery waveform changes were recorded during pneumatic cuff deflation.
  • Phonocardiography objectively identified Korotkoff sound phases I-V.

Main Results:

  • Characteristic brachial artery waveform features were consistently associated with Korotkoff sound phases I-IV in all participants.
  • No consistent waveform features were identified for Korotkoff phase V.
  • The study demonstrated a clear link between specific hemodynamic changes and the initial phases of Korotkoff sounds.

Conclusions:

  • Korotkoff sound phases I-IV are associated with distinct alterations in the pattern and direction of blood flow in the brachial artery.
  • Vascular sounds are modulated by blood flow dynamics, not solely caused by turbulence.
  • This research clarifies the hemodynamic basis of Korotkoff sounds in normotensive pregnant women.

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