RESUMO
A 71-year-old man with ischemic cardiomyopathy, a left ventricular (LV) ejection fraction of 23â¯%, left bundle branch block with a QRS duration of 160 milliseconds, and nonsustained ventricular tachycardia was admitted for cardiac resynchronization therapy combined with an implantable defibrillator. During LV lead placement, the guiding sheath encountered strong resistance during deep coronary sinus (CS) cannulation. CS venography showed a complete occlusion, and we diagnosed venospasm because the occlusion self-resolved after several minutes. After administering intravenous isosorbide dinitrate and waiting several minutes without manipulating the catheters, we could successfully place the LV lead in the target branch. Although CS spasm is considered a rare complication of LV lead placement, in some cases catheter manipulation can trigger it. Therefore, clinicians should recognize its possibility and be aware of the associated angiographic findings and treatment. Learning objective: In some cases, coronary sinus (CS) spasm can be triggered during left ventricular lead placement. It presents as occlusion with abrupt tapering on CS venography. After administering intravenous nitrates and waiting several minutes without manipulating the catheters, the spasm resolves and the catheter can be advanced.
