Conduction disturbances between a pacemaker electrode and the myocardium in right ventricular infarction

Area of Science:

• Cardiology
• Electrophysiology
• Myocardial Infarction

Background:

• Pacemaker implantation is a common procedure for managing bradyarrhythmias.
• Inferior myocardial infarction can affect cardiac conduction.
• Assessing ventricular function and conduction is crucial post-myocardial infarction.

Observation:

• A patient with inferior myocardial infarction experienced rate-dependent first-degree block, progressing to complete block.
• Conduction disturbances were noted during pacing at the right ventricle's postero-basal wall, but not at the apex.
• These findings suggest localized myocardial damage.

Findings:

• The observed conduction blocks indicate compromised electrical signal transmission between the pacemaker electrode and the ventricular myocardium.
• Differential pacing responses suggest the posterior region of the right ventricle was affected by the infarction.
• Hemodynamic assessments corroborated the presence of right ventricular infarction.

Implications:

• This case highlights the importance of careful pacemaker lead placement and monitoring for conduction abnormalities.
• Understanding the specific location of myocardial damage can refine treatment strategies.
• Electrophysiological assessment during pacing can aid in diagnosing the extent of myocardial injury.