Multidetector cardiac tomography: a useful tool before cardiac resynchronization therapy

Area of Science:

• Cardiology
• Medical Imaging
• Interventional Cardiology

Background:

• Accurate left ventricular lead placement is crucial for cardiac resynchronization therapy (CRT) responsiveness.
• Multidetector cardiac tomography (MDCT) is a non-invasive imaging modality for assessing cardiac venous anatomy.
• Coronary sinus (CS) retrograde venography (RV) is the current gold standard for visualizing CS tributaries.

Purpose of the Study:

• To evaluate the diagnostic accuracy of MDCT in identifying CS tributaries before CRT.
• To compare the effectiveness of MDCT versus RV in depicting cardiac veins relevant for CRT lead placement.

Main Methods:

• Retrospective analysis of 41 patients eligible for CRT.
• MDCT and RV were performed to assess the presence of the inferior interventricular vein (IIV), posterior vein (PV), and lateral main vein (LMV).
• Measurements of CS ostium diameter and distance from the CS ostium to the right atrium (RA) lateral wall were also conducted.

Main Results:

• MDCT identified the IIV in 100% of cases, compared to 43.6% with RV.
• MDCT demonstrated high sensitivity (100%) for detecting PV and LMV, with good agreement (kappa coefficients 0.792 and 0.69, respectively) compared to RV.
• Significant measurements of CS diameter and a correlation between RA area and CS ostium-RA distance were observed.

Conclusions:

• MDCT is a highly accurate and non-invasive method for depicting the CS and its tributaries.
• MDCT can be effectively utilized as a pre-procedural tool for planning CRT lead placement.
• The findings support MDCT as a valuable alternative to conventional venography.