Related Experiment Videos
[Right bundle-branch block configuration in the pacemaker ECG--3 different observations]
Insights
Pacemaker implantation can lead to right bundle branch block due to unusual catheter placement. Imaging and ECG help detect these critical misplacements.
Area of Science:
- Cardiology
- Medical Devices
- Electrophysiology
Background:
- Pacemaker implantation is a common procedure for managing bradyarrhythmias.
- Right bundle branch block (RBBB) can be an unexpected finding post-pacemaker insertion.
- Understanding potential causes of RBBB is crucial for patient safety.
Observation:
- Three cases are presented where RBBB occurred after pacemaker implantation due to malpositioned leads.
- Case 1: Lead traversed a sinus venosus defect into the left atrium and ventricle.
- Case 2: Lead perforated the atrial septum, entering the left ventricle.
- Case 3: Lead tip penetrated the ventricular septum from the right ventricle.
Findings:
- Unusual pacemaker lead placement, including atrial and ventricular septal defects or perforation, can mimic or cause RBBB.
- Misplacement into the left-sided circulation or through the septum requires prompt identification.
- Specific malpositions, such as in the coronary sinus or pericardial space, are also discussed.
Implications:
- Accurate interpretation of electrocardiograms (ECGs) and imaging is vital for detecting lead misplacement.
- Diagnostic tools like lateral radiography, 12-lead ECG, and echocardiography are essential.
- Preventing lead placement in arterial areas, pericardial space, and coronary sinus is critical for optimal pacemaker function and patient outcomes.
Abstract:
We report on 3 cases of right bundle branch block configuration in the ECG after pacemaker implantation. In case 1 it was not noticed that the catheter had been directed through an unknown sinus venosus defect into the left atrium and the left ventricle. In case 2 the catheter reached the left ventricle via an iatrogenic perforation of the lower part of the atrial septum. In case 3 the catheter was situated correctly in the right ventricle, but the tip was penetrating the septum. Different possibilities of interpretation of this phenomenon are discussed, and a description of further pacemaker catheter misplacements which may be responsible for a right bundle branch block configuration is given. The authors take the view that a pacemaker catheter should not remain in the arterial area, in the pericardial space and in the coronary sinus. A lateral radiograph, a 12-lead ECG and an echocardiographic study are helpful for detecting and interpreting an unusual catheter position or a right bundle branch block configuration in the pacemaker ECG.