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J Thorac Cardiovasc Surg 2007;134:677-682
© 2007 The American Association for Thoracic Surgery

Surgery for Acquired Cardiovascular Disease

Does right thoracotomy increase the risk of mitral valve reoperation?

^a Department of Thoracic and Cardiovascular Surgery, Cleveland Clinic, Cleveland, Ohio
^b Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio.

Received for publication March 10, 2006; revisions received April 10, 2007; accepted for publication April 16, 2007.

^_* Address for reprints: Lars G. Svensson, MD, PhD, Department of Thoracic and Cardiovascular Surgery, Cleveland Clinic, 9500 Euclid Avenue/Desk F24, Cleveland, OH 44195. (Email: svenssl{at}ccf.org).

Objective: The study objective was to determine whether a right thoracotomy approach increases the risk of mitral valve reoperation.

Methods: Between January of 1993 and January of 2004, 2469 patients with mitral valve disease underwent 2570 reoperations (1508 replacements, 1062 repairs). The approach was median sternotomy in 2444 patients, right thoracotomy in 80 patients, and other in 46 patients. Multivariable logistic regression was used to identify factors associated with median sternotomy versus right thoracotomy, mitral valve repair versus replacement, hospital death, and stroke. Factors favoring median sternotomy (P < .03) included coronary artery bypass grafting (30% vs 2%), aortic valve replacement (39% vs 2%), tricuspid valve repair (27% vs 13%), fewer previous cardiac operations, more recent reoperation, and no prior left internal thoracic artery graft. These factors were used to construct a propensity score for risk-adjusting outcomes.

Results: Hospital mortality was 6.7% (163/2444) for the median sternotomy approach and 6.3% (5/80) for the thoracotomy approach (P = .9). Risk factors (P < .04) included earlier surgery date, higher New York Heart Association class, emergency operation, multiple reoperations, and mitral valve replacement. Stroke occurred in 66 patients (2.7%) who underwent a median sternotomy and in 6 patients (7.5%) who underwent a thoracotomy (P = .006). Mitral valve replacement (vs repair) was more common in those receiving a thoracotomy (P < .04).

Conclusions: Compared with median sternotomy, right thoracotomy is associated with a higher occurrence of stroke and less frequent mitral valve repair. Specific strategies for conducting the operation should be used to reduce the risk of stroke when right thoracotomy is used for mitral valve reoperation. In most instances, repeat median sternotomy, with its better exposure and greater latitude for concomitant procedures, is preferred.

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