Does off-pump bilateral internal thoracic artery grafting increase operative risk in dialysis patients?

Takeshi Kinoshita1, Tohru Asai, Soh Hosoba

  • 1Department of Cardiovascular Surgery, Shiga University of Medical Science, Setatsukinowa, Ohtsu, Shiga, Japan. kinotake@belle.shiga-med.ac.jp

Insights

Bilateral internal thoracic artery (BITA) grafting is safe for dialysis patients with multivessel disease. This surgical technique showed comparable short-term outcomes to single internal thoracic artery (SITA) grafting, including mortality and wound healing.

Area of Science:

  • Cardiovascular Surgery
  • Thoracic Surgery
  • Vascular Surgery

Background:

  • Patients on chronic dialysis often have multivessel coronary artery disease.
  • Internal thoracic artery grafting is a preferred method for coronary artery bypass grafting.
  • Comparing bilateral (BITA) versus single (SITA) internal thoracic artery grafting in dialysis patients is crucial for optimizing outcomes.

Purpose of the Study:

  • To compare short-term outcomes of bilateral internal thoracic artery (BITA) grafting versus single internal thoracic artery (SITA) grafting in patients on chronic dialysis undergoing coronary artery bypass grafting.
  • To evaluate the safety and feasibility of BITA grafting in this high-risk population.

Main Methods:

  • Retrospective comparison of 56 dialysis patients with multivessel disease undergoing isolated coronary artery bypass grafting (99.1% off-pump) between 2002 and 2008.
  • Patients were divided into BITA (n=32) and SITA (n=23) grafting groups.
  • Propensity score analysis using 13 preoperative factors was employed to minimize selection bias.

Main Results:

  • No significant differences in baseline characteristics (age, LVEF, diabetes, logistic euroSCORE) between BITA and SITA groups.
  • All patients underwent off-pump coronary artery bypass grafting with complete revascularization using skeletonized arterial conduits.
  • No significant differences were observed in mediastinitis, impaired wound healing, or stroke between the groups. 30-day mortality was 6.3% for BITA vs. 13.0% for SITA (P=.64).
  • Adjusted propensity score analysis showed BITA grafting was not associated with impaired wound healing (OR 0.63) or increased 30-day mortality (OR 0.60).

Conclusions:

  • In situ skeletonized bilateral internal thoracic artery grafting is a safe and feasible surgical option for dialysis patients with multivessel coronary artery disease.
  • BITA grafting demonstrates comparable short-term outcomes to SITA grafting in this patient population, including wound healing and mortality.
  • The findings support the use of BITA grafting in selected dialysis patients to potentially improve long-term outcomes.
Abstract

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