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Variable patterns of atrial natriuretic peptide secretion in man
A M Nugent1, G N Onuoha, D J McEneaney
1Department of Medicine, Royal Victoria Hospital, Belfast, Northern Ireland.
European Journal of Clinical Investigation
|April 1, 1994
Summary
Atrial natriuretic peptide (ANP) shows pulsatile secretion in healthy individuals and those with heart failure. This peptide
Area of Science:
- Cardiology
- Endocrinology
- Physiology
Background:
- Atrial natriuretic peptide (ANP) plays a crucial role in cardiovascular homeostasis.
- Peripheral ANP levels may reflect a pulsatile secretion pattern.
- Understanding ANP secretion dynamics is vital for cardiovascular research.
Purpose of the Study:
- To investigate the short-term variability and pulsatile secretion pattern of ANP in humans.
- To compare ANP secretion patterns in patients with chronic cardiac failure versus healthy controls.
- To explore the relationship between ANP levels and cardiac function indicators.
Main Methods:
- Collected peripheral venous blood samples every 2 minutes for 90 minutes from 16 heart failure patients and 13 controls.
- Performed simultaneous blood sampling from pulmonary artery, femoral artery, and peripheral vein in 8 healthy subjects and 6 valvular heart disease patients.
- Utilized computer analysis to identify peaks, troughs, and pulses in ANP levels.
Main Results:
- Overall ANP levels were significantly higher in heart failure patients compared to controls (P < 0.001).
- Both groups exhibited considerable variability in ANP levels, with numerous identified pulses, peaks, and troughs.
- The pulsatile pattern of ANP variability was consistent across different vascular sites (pulmonary artery, femoral artery, peripheral vein).
- No correlation was found between ANP variations and concurrent changes in heart rate or right atrial pressure in healthy individuals.
- A significant correlation was observed between pulmonary artery ANP levels and right atrial pressure in heart failure patients (r = 0.87; P < 0.05).
Conclusions:
- Peripheral circulating atrial natriuretic peptide exhibits a pulsatile pattern of secretion.
- This pulsatile secretion is likely intrinsic to the peptide and not due to variable lung breakdown.
- Elevated ANP levels and pulsatile secretion are present in chronic cardiac failure.
- The precise mechanism and pathophysiological significance of ANP's pulsatile periodicity require further investigation.