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Transient myocardial ischemia stimulates atrial natriuretic factor release
L S Malatino1, C Leonardi, B Stancanelli
1Istituto di Clinica Medica Luigi Condorelli, University of Catania, Italy.
Insights
Transient myocardial ischemia, a condition often seen in coronary artery disease, triggers the release of atrial natriuretic factor. This hormone
Area of Science:
- Cardiology
- Endocrinology
- Physiology
Background:
- Atrial natriuretic factor (ANF) plays a role in cardiovascular homeostasis.
- Transient myocardial ischemia is a hallmark of symptomatic coronary artery disease (CAD).
- The relationship between ischemia-induced cardiac dysfunction and ANF release requires further elucidation.
Purpose of the Study:
- To investigate atrial natriuretic factor (ANF) release during transient myocardial ischemia in patients with coronary artery disease (CAD).
- To explore the correlation between ANF levels and hemodynamic changes, specifically pulmonary artery wedge pressure, during ischemia.
- To compare ANF release patterns during percutaneous transluminal coronary angioplasty (PTCA)-induced ischemia with those during angina.
Main Methods:
- Prospective study involving 29 patients with symptomatic CAD (Canadian Cardiovascular Association classes II-III).
- Group I (n=11) underwent percutaneous transluminal coronary angioplasty (PTCA); measurements included pulmonary artery wedge pressure and atrial natriuretic factor (ANF) levels at baseline and 2, 5, 15 minutes post-PTCA.
- Groups II and III experienced dye load and angina, respectively, with serial ANF measurements to compare release dynamics.
Main Results:
- Atrial natriuretic factor (ANF) levels significantly increased from baseline (34.6 +/- 4.5 pg/ml) to 56.3 +/- 7.3 pg/ml at 2 minutes post-PTCA (p = 0.02).
- ANF changes were strongly correlated with mean pulmonary artery wedge pressure changes (2 min: r = 0.69, p = 0.02; 5 min: r = 0.90, p < 0.001).
- ANF release during angina (Group III) occurred as early as after PTCA, suggesting ischemia is a potent stimulus.
Conclusions:
- Transient myocardial ischemia, whether induced by PTCA or occurring during angina, stimulates atrial natriuretic factor (ANF) release.
- The observed correlation suggests that changes in cardiac function, reflected by pulmonary artery wedge pressure, mediate ANF release during ischemia.
- These findings highlight ANF as a potential biomarker for ischemic events and associated cardiac dysfunction in CAD patients.
Abstract:
Atrial natriuretic factor release during transient myocardial ischemia was investigated in 29 patients with coronary artery disease and symptoms of angina (Canadian Cardiovascular Association classes II-III). Eleven patients (group I) underwent single-vessel percutaneous transluminal coronary angioplasty. Repeat determinations of mean pulmonary artery wedge pressure and blood sampling from pulmonary artery for atrial natriuretic factor measurements were performed at baseline, and at 2, 5, and 15 minutes after percutaneous transluminal coronary angioplasty was begun. Baseline atrial natriuretic factor levels (34.6 +/- 4.5 pg/ml) rose to 56.3 +/- 7.3 pg/ml (p = 0.02) and decreased at 5 minutes (43.7 +/- 5.7 pg/ml, not significant) and 15 minutes (35.3 +/- 4.4 pg/ml, not significant). Changes in atrial natriuretic factor concentrations were significantly correlated with those in mean pulmonary artery wedge pressure (2 minutes: r = 0.69, p = 0.02; 5 minutes: r = 0.90, p less than 0.001). In group II (n = 10) the increase in atrial natriuretic factor after dye load occurred later (baseline: 25.8 +/- 2.1; 60 minutes: 40.6 +/- 2.6 pg/ml; p = 0.005) than that observed in group I after percutaneous transluminal coronary angioplasty. In group III, atrial natriuretic factor during angina rose as early (baseline 11.3 +/- 1.3; 5 minutes: 20 +/- 2.3 pg/ml; p = 0.006) as after percutaneous transluminal coronary angioplasty. Results indicate that transient myocardial ischemia stimulates atrial natriuretic factor release, probably through changes in cardiac function.