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Eur J Cardiothorac Surg 2002;22:762-770
© 2002 Elsevier Science NL

Surgery for ventricular tachycardia of left ventricular origin: risk factors for success and long-term outcome

^a Department of Cardiothoracic Surgery, Cardiac Directorate, University Hospital of Wales, Cardiff, CF14 4XW, UK
^b Vincent Pallotti Hospital, Cape Town, South Africa
^c Cardiac Clinic, Department of Medicine, University of Cape Town, Cape Town, South Africa

Received 11 February 2002; received in revised form 6 August 2002; accepted 8 August 2002.

* Corresponding author. Tel.: +44-29-2074-2944; fax: +44-29-2074-5439
e-mail: uvonopp{at}uhw-tr.wales.nhs.uk

Objectives: To review 26 consecutive patients with sustained monomorphic ventricular tachycardia (VT) of left ventricular origin, who underwent direct VT surgery. Methods: Economic factors precluded the use of an implantable cardioverter defibrillator (ICD) in the majority of these patients, and the indication for surgery in 81% of patients was for failed medical drug therapy and 27% of patients had frequent or incessant life-threatening VT. The principles of direct VT surgery included intraoperative mapping, extended endocardial resection, cryoablation, left ventricular aneurysm repair by left ventricular remodelling and endoaneurysmorrhaphy, as well as coronary artery bypass grafting. Results: Two patients with non-ischaemic VT were significantly younger (37.7±19.4 years, P=0.03), had lower preoperative New York Heart Association class (P=0.03), and had better left ventricular ejection fractions of 59.5±2.1% (P=0.001) than the 24 ischaemic patients. No operative mortality or recurrence of VT occurred in this group. Ischaemic VT patients had an operative mortality of 8.3%; risk factors were concomitant valve surgery (P=0.02), and perioperative intra-aortic balloon pump (P=0.02). Surgery improved the left ventricular ejection fraction from 28.4±9.8% to 43.2±8.2% (P=0.0001). Freedom from recurrence or inducibility of VT in operative survivors was 78.8±9.6% at 10 years; risk factors were arrhythmic focus remote to the left ventricular aneurysm (P=0.015), and simple cryoablation or endocardial resection alone and not in combination (P=0.003). Survival was 54.1±11.6% and 43.3±13.4% at 5 and 10 years, respectively, and there were no arrhythmic or sudden cardiac deaths. Patients with immediately life-threatening VT unsuitable for ICD implantation requiring urgent or emergent VT surgery had a 10-year survival of 22.2±13.9% compared to the more elective surgical group with a rate of 73.3±13.9% (P=0.08). Conclusions: Direct VT surgery should remain an objective for symptomatic drug refractory VT of left ventricular origin.

Key Words: Arrhythmia • Ventricular tachycardia • Treatment • Surgery • Endocardial resection • Cryoablation

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