• Hany M Osman, Fatma Nabil, and Mohamed Anwar.
• Department of Anesthesia and Intensive Care, Faculty of Medicine, Assiut University, Assiut, Egypt. Electronic address: hanymeo@aun.edu.eg.
• J. Cardiothorac. Vasc. Anesth. 2022 Oct 1; 36 (10): 3773-3779.

ObjectivesThis study aimed to evaluate the effect of radial artery cannulation on hand perfusion in patients with normal modified Allen's test undergoing cardiac surgeries using cardiopulmonary bypass (CPB).DesignProspective follow-up study.SettingSingle institution, Assiut University Cardiothoracic Hospital.ParticipantsForty-nine patients who underwent cardiac surgeries using cardiopulmonary bypass were enrolled.InterventionsCannulation of radial artery in the dominant hand using a 20-gauge catheter.Measurements And Main ResultsThe primary outcomes were the mean peripheral perfusion index (PPI) >60 seconds (mean PPI60) and the thumb temperature, which were measured at different times before and during the surgery. There was a statistically significant difference in the mean PPI60 between both hands (p = 0.033). Before skin incision, the mean PPI60 was significantly higher in the noncannulated hand (p < 0.001). Also, there was a statistically significant difference in the thumb temperature between both hands (p = 0.013). At low core body temperature, the thumb temperature was significantly lower in the noncannulated hand (p = 0.017).ConclusionsIn adult patients undergoing cardiac surgeries using CPB, even with normal modified Allen's test, radial artery cannulation may affect the perfusion of the dominant hand, especially at low arterial blood pressure or low core body temperature. Since the PPI is one of the noninvasive methods used for intraoperative assessment of the peripheral perfusion, the authors recommend the use of the noncannulated hand for this purpose to not misguide this assessment.Copyright © 2022 Elsevier Inc. All rights reserved.

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