Cardiac pacing in unilateral left superior vena cava: evaluation by digital angiography

Area of Science:

• Cardiology
• Oncology
• Medical Imaging

Background:

• Complete heart block necessitates pacemaker implantation for hemodynamic stability.
• Chronic lymphocytic leukemia can present complex clinical scenarios, potentially complicating device implantation.
• Subclavian vein access is a common route for pacemaker lead insertion.

Observation:

• A patient with complete heart block and chronic lymphocytic leukemia experienced failed attempts at pacemaker lead insertion via both right and left subclavian veins.
• Digital subtraction angiography was employed to investigate the cause of failed lead insertion and to identify alternative routes.
• The imaging study revealed a unilateral left superior vena cava, a rare anatomical variation.

Findings:

• Digital subtraction angiography successfully excluded a neoplastic mediastinal mass as the cause of obstruction.
• The presence of a unilateral left superior vena cava was confirmed as the anatomical anomaly.
• The angiography delineated the optimal pathway for pacemaker lead insertion, circumventing the anomalous venous anatomy.

Implications:

• This case highlights the importance of advanced imaging techniques like digital subtraction angiography in complex pacemaker implantations.
• Recognizing and navigating venous anomalies such as a unilateral left superior vena cava is crucial for procedural success.
• Effective management strategies for pacemaker lead insertion in patients with hematologic malignancies and anatomical variations can be developed.