This study furnishes evidence that both confirms and refutes a long-standing maxim that a one-unit transfusion of red blood cells should yield a posttransfusion hemoglobin increment of 1 g/dL.

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We report the first case, to our knowledge, of atrial dissociation in a patient who underwent bicaval orthotopic heart transplantation. It was believed that atrioventricular dissociation prompting pacemaker implantation likely represented donor sinus bradycardia/arrest with intact atrioventricular conduction with surgically isolated recipient atrial activity.