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Left ventricular function can be continuously monitored with an epicardially attached accelerometer sensor.

Stefan Hyler1, Andreas Espinoza2, Helge Skulstad3

  • 1The Intervention Centre, Rikshospitalet, Oslo University Hospital, Oslo, Norway.

European Journal of Cardio-Thoracic Surgery : Official Journal of the European Association for Cardio-Thoracic Surgery
|February 1, 2014
PubMed
Summary
This summary is machine-generated.

An epicardial accelerometer accurately monitors left ventricular (LV) performance, providing continuous data during cardiac surgery. This novel method enhances perioperative monitoring by detecting changes in global and regional LV function with high sensitivity.

Keywords:
Continuous cardiac monitoringContractilityLeft ventricular functionStrain echocardiography

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Area of Science:

  • Cardiovascular Physiology
  • Surgical Monitoring Technologies
  • Biomedical Engineering

Background:

  • Preserving left ventricular (LV) function is critical for successful outcomes in high-risk cardiac surgery patients.
  • Continuous, accurate monitoring of LV performance is essential for effective perioperative management.
  • Existing methods for assessing LV function may have limitations in sensitivity or continuous monitoring capabilities.

Purpose of the Study:

  • To evaluate the efficacy of an epicardially attached motion sensor (accelerometer) for continuous monitoring of LV performance.
  • To assess the accelerometer's ability to detect changes in both global and regional LV function during various interventions.
  • To compare the accelerometer's performance against established measures like left ventricular stroke work (LVSW) and echocardiography.

Main Methods:

  • An accelerometer was implanted on the anterior apical LV region in 11 pigs.
  • Global LV function was altered using esmolol, epinephrine, and fluid loading.
  • Regional LV dysfunction was induced via left anterior descending (LAD) coronary artery occlusion; accelerometer-derived peak systolic velocity was compared with LVSW and echocardiographic parameters.

Main Results:

  • Accelerometer peak systolic velocity significantly correlated with LVSW (r=0.81) and myocardial strain (r=0.80), demonstrating strong agreement.
  • The accelerometer accurately detected global LV function changes induced by pharmacological agents and fluid loading.
  • It showed superior sensitivity and specificity in detecting regional LV dysfunction (myocardial ischemia) compared to LVSW and ejection fraction.

Conclusions:

  • An epicardially attached accelerometer provides accurate, continuous information on left ventricular performance.
  • This technology offers a promising tool for enhanced perioperative monitoring in cardiac surgery.
  • The accelerometer's ability to detect both global and regional LV dysfunction warrants further clinical investigation.