[Agenesis of the right superior vena cava associated with total heart block]

Area of Science:

• Cardiology
• Congenital Abnormalities
• Medical Imaging

Background:

• The superior vena cava (SVC) is a major vein returning deoxygenated blood from the upper body to the heart.
• Congenital anomalies of the great veins, though rare, can present diagnostic and therapeutic challenges.
• Total heart block requires pacemaker implantation for hemodynamic stability.

Observation:

• A patient presented for pacemaker implantation due to total heart block.
• During the procedure, an unusual vascular anatomy was noted: a superior left vena cava (SLVC) with an absent right superior vena cava (RSVC).

Findings:

• The presence of SLVC and absence of RSVC is a rare congenital abnormality.
• This anomaly complicated the standard pacemaker implantation technique, particularly ventricular lead placement.
• Diagnostic imaging confirmed the vascular anomaly but highlighted the challenges in its definitive diagnosis.

Implications:

• Recognition of this anomaly is crucial for guiding surgical and interventional procedures.
• Alternative techniques may be required for device implantation in patients with this condition.
• Further investigation into the embryological basis and clinical significance of SLVC with absent RSVC is warranted.