1. Biphasic pulse wave due to asyncronous heart contractions in heterotopic cardiac transplantation 
Alejandro Aris, MD, PhD 
The Annals of Thoracic Surgery 
Volume 68, Issue 5, (November 1999)
DOI: /S (99)

2. Figure
A 53-year-old woman with dilated myocardiopathy underwent cardiac transplantation in June Due to severe pulmonary hypertension (systolic pulmonary artery pressure 88 mm Hg, Wood units 5.8), a heterotopic heart transplant was performed. During the postoperative period, contraction of both hearts was seen in the electrocardiogram (top) with a positive deflection of the donor heart and a negative of the native heart. When both hearts contracted simultaneously, as seen at the left part of the tracing, the blood pressure curve (bottom) had a normal, monophasic configuration. However, different heart rates led to asynchronous contractions, as seen at right, producing a biphasic pulse wave similar to the one found in counterpulsation.
The Annals of Thoracic Surgery  , DOI: ( /S (99) )