Related Experiment Video
Updated: Oct 10, 2025
06:04
Author Spotlight: Establishment and Confirmation of a Postnatal Right Ventricular Volume Overload Mouse Model
Published on: June 9, 2023
1.2K
Smart Drain for Post-Cardiac Surgery Left Ventricular Volumes Evaluated in Large Animal Models.
Aleksandra B Gruslova1, Andrew G Cabe1, Anil Kottam2
1Department of Medicine, Division of Cardiology, University of Texas Health Science Center at San Antonio, San Antonio, Texas.
The Annals of Thoracic Surgery
|December 10, 2021
Summary
Pericardial drain admittance monitoring accurately detects changes in left ventricular volumes after heart surgery. This method may help predict hypotension by distinguishing hypovolemia from decreased heart function.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
- Surgical Monitoring
Background:
- Open heart surgeries like coronary arterial bypass graft and valve replacements are common, with 400,000 performed annually in the US.
- Unexplained hypotension post-surgery leads to significant morbidity and mortality due to organ hypoperfusion.
- Early detection of hypotension causes, differentiating hypovolemia from myocardial dysfunction, is crucial for improved patient outcomes.
Purpose of the Study:
- To investigate the potential of admittance measured from modified pericardial drains for early detection of hemodynamic changes.
- To hypothesize that this admittance measurement can detect alterations in left ventricular volumes before hypotension onset.
Main Methods:
- Admittance was measured using modified pericardial drains with electrodes in 7 dogs during open-chest surgery.
- Resistive and capacitive components of admittance distinguished blood from muscle.
- Left ventricular preload was manipulated via vena cava occlusion, with physiological responses monitored.
Main Results:
- Admittance measurements significantly detected reductions in left ventricular end-diastolic volume (P < .001), end-systolic volume (P < .001), and stroke volume (P < .001).
- Left ventricular muscle resistance correlated strongly with wall thickness (R² = 0.96), confirming accurate tissue differentiation.
Conclusions:
- Admittance monitoring via chest tubes effectively detects changes in left ventricular volumes.
- This technique shows promise as a diagnostic tool for identifying the causes of unexplained hypotension post-cardiac surgery.
