title: Persistent left superior vena cava, significance in emergency cardiac pacing.
mesh_terms: D000368:Aged; D006328:Cardiac Catheterization / Q000009:adverse effects*; D004630:Emergencies; D005260:Female; D006327:Heart Block / Q000628:therapy; D006801:Humans; D010138:Pacemaker, Artificial / Q000009:adverse effects; D014683:Vena Cava, Superior / Q000002:abnormalities*