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Related Experiment Videos

Conductance-echocardiography correlation during changes in left ventricular volume

S E Cabreriza1, M M Amirhamzeh, C X Jia

  • 1Department of Surgery, Columbia University College of Physicians and Surgeons, New York, New York, USA.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|July 1, 1995
PubMed
Summary

Left ventricular conductance (COND) measurements can be unreliable during surgery. Two-dimensional echocardiography

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Area of Science:

  • Cardiovascular Physiology
  • Medical Imaging
  • Surgical Monitoring

Background:

  • Left ventricular volume measurements using conductance (COND) can be affected by external factors during complex procedures.
  • A reliable reference technique is essential to validate COND measurements and identify when recalibration is necessary.

Purpose of the Study:

  • To assess the relationship between left ventricular COND and short-axis cross-sectional area (SACS) measured by two-dimensional echocardiography.
  • To establish a method for verifying the accuracy of COND measurements during cardiac surgery and experiments.

Main Methods:

  • Thirteen anesthetized pigs underwent instrumentation with a COND catheter and simultaneous two-dimensional echocardiography.
  • Data were collected at end-diastole during vena caval occlusion to optimize echocardiographic quality.

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  • Analysis focused on the correlation between COND and SACS.

    • Main Results:

    • A strong linear relationship was observed between left ventricular COND and SACS at end-diastole (correlation coefficients 0.88-1.0, average 0.96).
    • The established relationship was SACS = 0.40 (COND) - 17.
    • High correlation indicates the stability and validity of COND measurements.

    Conclusions:

    • Two-dimensional echocardiography-derived SACS can serve as a reliable reference to confirm left ventricular end-diastolic volume measurements by COND.
    • Monitoring the SACS-COND relationship ensures the accuracy of COND calibration during surgical procedures and laboratory experiments.
    • Deviations from the linear SACS-COND relationship suggest experimental errors requiring data exclusion.