Related Experiment Video
Updated: Apr 27, 2026
Cardiac Pressure-Volume Loop Analysis Using Conductance Catheters in Mice
Published on: September 17, 2015
Use of pressure-volume conductance catheters in real-time cardiovascular experimentation
Abraham E Wei1, Mikhail Y Maslov1, Matthew J Pezone1
1Department of Anesthesiology and Pain Medicine, Steward St. Elizabeth's Medical Center/Tufts University School of Medicine, Boston, MA, 02135, USA.
Insights
Continuous cardiovascular monitoring using pressure-volume (PV) conductance catheters is challenging. Inotropic drug infusions can cause artifacts by altering ventricular dimensions, requiring frequent repositioning for accurate real-time hemodynamic assessment.
Area of Science:
- Cardiovascular Physiology
- Hemodynamics
- Medical Instrumentation
Background:
- Pressure-volume (PV) conductance catheterization is typically a single-time point assessment of cardiovascular function.
- Utilizing PV catheters for continuous monitoring presents significant complexities and limitations.
Purpose of the Study:
- To demonstrate limitations and optimal use of PV conductance catheters as continuous, real-time cardiovascular monitors.
- To analyze artifacts during inotropic drug infusion in anesthetized rats.
Main Methods:
- Anesthetized rats underwent continuous PV conductance catheter monitoring during inotropic drug infusion.
- Artifacts were induced by changes in ventricular dimensions and catheter movement.
- Correction strategies including catheter repositioning and fluid administration were evaluated.
Main Results:
- Inotropic agents altered ventricular dimensions, causing catheter movement and artifacts.
- Artifacts included overestimated contractility (max dP/dt) and signal loss.
- Catheter repositioning and crystalloid infusion offered partial correction, but fluid administration impacted baseline hemodynamics.
Conclusions:
- Pressure-volume artifacts during inotropic infusion stem from catheter-endocardial contact.
- Continuous PV monitoring requires repeated catheter repositioning during interventions altering ventricular dimensions.
- Optimizing real-time PV catheter use necessitates careful management of ventricular dynamics and catheter placement.
Background:
Most applications of pressure-volume conductance catheter measurements assess cardiovascular function at a single point in time after genetic, pharmacologic, infectious, nutritional, or toxicologic manipulation. Use of these catheters as a continuous monitor, however, is fraught with complexities and limitations.
Methods:
Examples of the limitations and optimal use of conductance catheters as a continuous, real-time monitor of cardiovascular function are demonstrated during inotropic drug infusion in anesthetised rats.
Results:
Inotropic drug infusion may alter ventricular dimensions causing relative movement of a well-positioned catheter, generating artifacts, including an abrupt pressure rise at end-systole that leads to over estimation of indices of contractility (max dP/dt) and loss of stroke volume signal. Simple rotation of the catheter, echocardiography-guided placement to the centre of the ventricle, or ventricular expansion through crystalloid infusion may correct for these artifacts. Fluid administration, however, alters left ventricular end-diastolic pressure and volume and therefore stroke volume, thereby obscuring continuous real-time haemodynamic measurements.
Conclusions:
Pressure-volume artifacts during inotropic infusion are caused by physical contact of the catheter with endocardium. Repeated correction of catheter position may be required to use pressure volume catheters as a continuous real-time monitor during manipulations that alter ventricular dimensions, such as inotropic therapy.
