Localization of the conduction delay occurring during coronary arteriography

Area of Science:

• Cardiology
• Electrophysiology
• Medical Imaging

Background:

• Intraventricular conduction is crucial for coordinated heart function.
• Coronary arteriography is a common diagnostic procedure.
• Potential effects of contrast agents on cardiac electrophysiology require investigation.

Purpose of the Study:

• To investigate the impact of coronary arteriography on intraventricular conduction.
• To determine if contrast media affects cardiac electrical pathways.

Main Methods:

• 12 open-chest dogs were studied under anesthesia and atropine.
• Left bundle-branch (LB) and cavitary (V) potentials were recorded.
• Subendocardial (SEE) and subepicardial (IME) potentials were measured.
• Conduction times were assessed during control and contrast (Renografin 76) injections into coronary arteries.

Main Results:

• Coronary arteriography with Renografin 76 caused significant delays in LB-SEE and V-SEE conduction.
• Increased QRS duration and QRS axis changes were observed in some dogs.
• Effects were primarily noted with injections into the left coronary artery (LCA).
• Transmural conduction (SEE to IME) remained unaffected.

Conclusions:

• Coronary arteriography, particularly with Renografin 76, alters conduction within the distal left ventricular Purkinje system.
• The procedure does not significantly impact transmural cardiac conduction.
• These findings highlight potential electrophysiological effects of contrast media during coronary arteriography.