Iatrogenic Transient Complete Heart Block in a Preexisting LBBB

Area of Science:

• Cardiology
• Medical Devices
• Patient Safety

Background:

• Catheter-induced cardiac arrhythmia is a known risk during cardiac procedures.
• Injury to the cardiac conduction system, particularly the right bundle branch, can cause fatal arrhythmias in patients with pre-existing left bundle branch block (LBBB).
• Arrhythmia during central venous cannulation is uncommon as the catheter typically does not enter the heart.

Purpose of the Study:

• To report a rare case of transient complete heart block during central venous cannulation.
• To highlight the potential risk of guide wire insertion in patients with LBBB.
• To discuss the mechanisms by which central venous cannulation can cause cardiac conduction abnormalities.

Main Methods:

• Case report detailing a patient with LBBB undergoing central venous cannulation.
• Review of potential mechanisms for guide wire-induced cardiac injury.
• Discussion of the anatomical considerations and risks associated with central venous catheterization.

Main Results:

• A patient with LBBB experienced transient complete heart block immediately following guide wire insertion.
• The complication occurred during a central venous cannulation procedure, not a typical cardiac catheterization.
• The guide wire's length, rigidity, and lack of insertion guidelines were identified as potential contributing factors.

Conclusions:

• Central venous cannulation, particularly guide wire insertion, poses a rare but significant risk of cardiac conduction abnormalities in patients with LBBB.
• This case underscores the importance of vigilance and careful technique during central venous cannulation in at-risk populations.
• Further guidelines for guide wire insertion may be warranted to mitigate this rare complication.