Right ventricular functional analysis utilizing first pass radionuclide angiography for pre-operative ventricular...

Area of Science:

• Cardiology
• Medical Imaging
• Heart Failure Management

Background:

• Advanced heart failure patients often have implantable cardioverter-defibrillators (ICDs), posing challenges for cardiac magnetic resonance imaging (MRI).
• Radionuclide angiography, including planar multigated acquisition (MUGA) and first pass radionuclide angiography (FPRNA), is used to assess ventricular function in these patients.
• Cardiac MRI is the reference standard for ventricular function assessment, but its use in ICD patients requires specific protocols.

Purpose of the Study:

• To correlate left and right ventricular ejection fractions calculated by radionuclide angiography with cardiac MRI in advanced heart failure patients with ICDs.
• To assess the agreement between cardiac MRI and echocardiographic/hemodynamic parameters for right ventricular function.
• To evaluate the accuracy of MRI in patients with ICDs using specialized protocols.

Main Methods:

• Retrospective review of advanced heart failure patients who underwent both cardiac MRI and radionuclide angiography.
• Analysis of ventricular functional parameters including LVEF and RVEF from both imaging modalities.
• Comparison of MRI findings with echocardiography and right heart catheterization data.

Main Results:

• Cardiac MRI and MUGA showed strong correlation for LVEF (R=0.9) with a mean discrepancy of 4.1%.
• Cardiac MRI and FPRNA demonstrated a moderate correlation for RVEF (R=0.5) with a mean discrepancy of 12.0%, which was statistically significant.
• Agreement between cardiac MRI and echocardiographic parameters (TAPSE, FAC) for RVEF was moderate.

Conclusions:

• Cardiac MRI provides accurate LVEF assessment in heart failure patients with ICDs.
• FPRNA shows only moderate correlation for RVEF compared to cardiac MRI, similar to echocardiographic parameters.
• Further research is needed to establish a more accurate method for RVEF estimation in pre-operative planning for ventricular assist device placement.