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Real-Time Ventricular Volume Measured Using the Intracardiac Electromyogram.

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A novel sensor using intracardiac electromyograms (iEMG) estimates left ventricular end-diastolic volume (EDV). This technology could enable real-time monitoring and automatic adjustment of left ventricular assist devices (LVADs).

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Physiology
  • Medical Device Technology

Background:

  • Left ventricular end-diastolic volume (EDV) is crucial for managing left ventricular assist device (LVAD) patients.
  • Continuous EDV monitoring is currently unavailable, limiting LVAD optimization.
  • Intracardiac electromyogram (iEMG) depolarization amplitude (DA) shows a physical relationship with EDV.

Purpose of the Study:

  • To develop and validate a novel left ventricular (LV) volume sensor using iEMG for beat-wise EDV estimation.
  • To assess the feasibility of integrating this sensor into LVAD systems for real-time monitoring and control.
  • To investigate the correlation between iEMG DA and EDV under varying hemodynamic conditions.

Main Methods:

  • A custom LV volume sensor with four pacemaker electrodes was used to measure far-field iEMG within the LV blood pool.
  • Simultaneous noninvasive measurements of EDV and hematocrit were recorded in six pigs.
  • Statistical analysis, including mixed-effect models, was employed to determine the significance and independence of the iEMG DA as an EDV predictor.

Main Results:

  • A statistically significant negative correlation (p = 3e-07) was found between iEMG DA and EDV (slope: -0.069 mV/mL).
  • Increased hematocrit (p = 0.039) and thorax opening (p = 0.003) showed minor decreases in DA.
  • iEMG DA was confirmed as a significant and independent predictor of EDV.

Conclusions:

  • The proposed iEMG-based LV volume sensor can provide beat-wise EDV estimates.
  • This technology has the potential for seamless integration into LVAD inflow cannulas.
  • Real-time EDV information could enhance clinical decision-making and enable automatic LVAD work adaptation.