[Clinical experiences with 3 different rate-adaptive pacemaker systems].

Physiological stimulation can be achieved by either bifocal or rate responsive pacing. The latter pacemakers adapt the heart rate to physical activity by biological signals. Of many possible approaches only three pacemaker systems for rate responsive pacing are available: the QT pacemaker (Tx or Quintech), the respiratory Biorate pacemaker and the activity detecting Activitrax.

Role of the renin-angiotensin system in the development of congestive heart failure in the dog as assessed by chronic converting-enzyme blockade.

Hormonal factors may be important in the regulation of peripheral vascular resistance (PVR) in congestive heart failure (CHF). The role of the renin-angiotensin system in the development of CHF was studied in 16 unanesthetized dogs. CHF was induced by rapid right ventricular pacing, with and without chronic converting-enzyme inhibition (CEI) by captopril.

Captopril in the long-term treatment of essential hypertension: changes in the renin-angiotensin-aldosterone system.

We investigated changes in the renin-angiotensin-aldosterone system in seven patients with essential hypertension during treatment with captopril (SQ 14225) (300 to 450 mg/day) for 12 months. While blood pressure decreased, the plasma-renin concentration increased to 700 percent of the initial value (6.1 +/- 2.

Captopril in congestive heart failure.

Vasodilator therapy is used widely for the treatment of congestive heart failure irrespective of its origin. The acute and long-term effects of captopril were studied in 50 patients with congestive heart failure due to valvular incompetence, hypertension, cardiomyopathy, and ischaemic heart disease. Haemodynamic studies were performed in all patients.