Objective to study the interaction of renin-angiotensin system (RAS) and atrial natriuretic factor (ANF) under acute angiotensin converting enzyme inhibitors (ACEI) in chronic renal failure (CRF).

Objective To determine the effects of endothelin-1(ET-1), calcitonin gene-related peptide (CGRP) and atrial natriuretic factor (ANF) in physiopathology of neonatal heart failure.

Objective: to explore the influence of the therapeutic dose ultrasound on plasma endothelin (et), atrial natriuretic factor (ANF) and heart electrophysiology in normal subjects.