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Rapid changes of atrial natriuretic peptide concentration during percutaneous transluminal coronary angioplasty
Insights
During coronary angioplasty, right atrial pressure and atrial natriuretic peptide (ANP) increased. However, plasma renin and aldosterone decreased, suggesting factors beyond atrial pressure regulate ANP release.
Area of Science:
- Cardiology
- Endocrinology
- Physiology
Background:
- Atrial natriuretic peptide (ANP) plays a crucial role in cardiovascular homeostasis.
- Understanding ANP regulation is vital for managing conditions like heart failure and hypertension.
Purpose of the Study:
- To investigate the relationship between hemodynamic changes and the release of ANP, plasma renin (PR), and plasma aldosterone (PA) during coronary angioplasty.
- To explore the regulatory factors of ANP release in response to altered atrial pressure.
Main Methods:
- Measurements of ANP, PR, and PA in 34 patients undergoing coronary angioplasty.
- Correlation of hormone levels with hemodynamic parameters, including right atrial pressure, before, during, and after vessel occlusion.
Main Results:
- A significant increase in right atrial pressure and ANP concentrations was observed during vessel occlusion.
- ANP elevation was particularly significant in patients with left anterior descending artery (LAD) occlusion.
- Plasma renin and aldosterone levels significantly decreased during vessel occlusion.
- No significant correlation was found between individual changes in right atrial pressure and ANP concentrations.
Conclusions:
- While increased right atrial pressure generally stimulates ANP release, it is not the sole determinant.
- Other regulatory mechanisms likely influence ANP secretion during acute hemodynamic changes in coronary angioplasty.
Abstract:
In 34 patients undergoing routine coronary angioplasty, concentrations of atrial natriuretic peptide (ANP), plasma renin (PR), and plasma aldosterone (PA) were estimated before, during, and after vessel occlusion and were correlated with hemodynamic changes. For the group as a whole, averaged right atrial pressure rose significantly (p less than 0.001) from 4.4 +/- 1.8 mm Hg at baseline to 6.7 +/- 3.0 mm Hg during vessel occlusion, and average right atrial ANP concentrations increased significantly (p less than 0.005) from 50.1 +/- 18.8 pg/ml to 59.7 +/- 21.4 pg/ml during balloon inflation. Data analysis of subgroups did not show any differences in right atrial pressure elevations between patients with left anterior descending artery (LAD) or right coronary artery (RCA) disease; ANP elevation was significant only in patients with LAD occlusion (p less than 0.001). In individual patients no statistically significant correlations were found to be present between changes in right atrial pressures and changes in atrial ANP concentrations. During vessel occlusion, PR dropped from 0.86 +/- 1.11 ng/ml/hr to 0.65 +/- 0.85 ng/ml/hr (p less than 0.001) in all patients, and PA decreased from 63.0 +/- 50.9 ng/ml to 52.2 +/- 43.4 ng/ml (p less than 0.01). Our data support the concept that, although an increase in right atrial pressure leads to ANP release in the majority of patients, atrial pressure and stretch are not the only regulatory factors of ANP release in humans.