[Circadian rhythm of arterial blood pressure and heart rate in patients with heart transplantation: a longitudinal study before and after transplantation].

This investigation is designed to study the circadian rhythm (CR) of blood pressure (BP) and heart rate (HR) in heart transplanted patients (HTP). The research was performed on 10 heart failure patients (HFP), IV NYHA class, who underwent heart transplantation (HT) because of a primary congestive cardiomyopathy. The 24-h BP and HR monitorings were performed by means of a non-invasive method in pre-operative stage, over the 4 post-operative days, 6 and 12 months after surgery. ANOVA and Cosinor method validated the occurrence of a statistically significant CR in HFP. Over the 4 days after HT, the Serial Section Analysis did not show a 24-h periodicity of BP and HR: 6 months after HT, the BP and HR CR was not validated as well. One year after HT, the BP and HR CR was statistically detected. A significant difference between HTP and the clinically healthy subjects was validated only for the mean value of HR. In our opinion, the consolidation of the BP and HR CR 1 year after HT might be regarded as a clinical feature of a reacquired matching of cardiac function with vascular activity.