Functional class and type of pulmonary hypertension determinate severity of cardiac autonomic dysfunction assessed by heart rate variability and turbulence.

Objective: Heart rate variability (HRV) and turbulence (HRT) are validated methods of evaluation of cardiac autonomic nervous system (cANS) dysfunction which is associated with sudden cardiac death. There is limited data on cANS imbalance and its significance,in patients with pulmonary hypertension (PH), so we assessed HRV and especially HRT alterations in PH.

Methods And Results: Thirty-three out of 41 PH patients were enrolled in the study: 22 (66.

Severity of arterial and chronic thromboembolic pulmonary hypertension is associated with impairment of heart rate turbulence.

Background: Heart rate turbulence (HRT) impairment is a validated and an independent indicator of cardiovascular death. There are limited data on HRT in pulmonary hypertension (PH), so we assessed potential HRT alterations in PH, especially in relation to its severity.

Methods: Thirty-three out of 41 patients were enrolled in the study aged 49.

Heart rate variability (HRV) and muscular system activity (EMG) in cases of crash threat during simulated driving of a passenger car.

Objectives: The aim of the study was to verify whether simultaneous responses from the muscular and circulatory system occur in the driver's body under simulated conditions of a crash threat.

Materials And Methods: The study was carried out in a passenger car driving simulator. The crash was included in the driving test scenario developed in an urban setting.

Heart rate turbulence impairment and ventricular arrhythmias in patients with systemic sclerosis.

Background: Arrhythmias, conduction disturbances, and cardiac autonomic nervous system dysfunction are the most frequent cardiovascular complications in systemic sclerosis (scleroderma). The aim of the study was to assess heart rate turbulence (HRT) in systemic sclerosis patients and to identify the relationship between HRT and occurrence of arrhythmias.

Methods: Forty-five patients with scleroderma (aged 54.

Heart rate turbulence assessment in systemic sclerosis: the role for the detection of cardiac autonomic nervous system dysfunction.

Objective: To assess the heart rate turbulence (HRT) in patients with SSc as a method of assessment for cardiac autonomic nervous function.

Methods: We prospectively studied 68 consecutive patients with SSc before inclusion in the study. After a detailed clinical evaluation, including echocardiography, 45 subjects [aged 54.

Pulmonary hypertension in systemic sclerosis determines cardiac autonomic dysfunction assessed by heart rate turbulence.

There is limited data on heart rate turbulence (HRT) in systemic sclerosis (SSc) patients, potentially threatened with cardiac autonomic dysfunction. We performed 24-hour Holter monitoring for HRT assessment in 45 patients with SSc and 30 healthy controls. Abnormal HRT defined as turbulence onset (TO) >or=0.