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Effective renal plasma flow response and atrial natriuretic peptide in patients with uncomplicated acute myocardial
C Y Chen1, S J Huang, T M Yang
1Division of Cardiology, Veterans General Hospital-Kaohsiung, Taiwan, Republic of China.
Insights
Acute myocardial infarction patients initially show higher effective renal plasma flow (ERPF), which decreases within a week. This change correlates with elevated atrial natriuretic peptide (ANP), suggesting a role in renal vasodilation post-infarction.
Area of Science:
- Nephrology
- Cardiology
- Endocrinology
Background:
- Acute myocardial infarction (AMI) can impact renal function.
- Atrial natriuretic peptide (ANP) plays a role in cardiovascular homeostasis.
Purpose of the Study:
- To investigate changes in effective renal plasma flow (ERPF) in patients with uncomplicated AMI.
- To explore the correlation between ERPF and ANP levels following AMI.
Main Methods:
- Utilized I-131 labeled iodo-ortho-hippurate to measure ERPF in 17 Chinese patients.
- Sequentially measured ANP levels six times per patient.
Main Results:
- ERPF was significantly higher upon admission compared to one week later (444.5 +/- 153.9 vs. 371.1 +/- 124.9 ml/min, p < 0.02).
- Initial ERPF elevation correlated with elevated ANP levels.
Conclusions:
- Uncomplicated AMI may induce renal vasodilatation.
- Elevated ANP levels might contribute to renal vasodilatation in AMI patients.
Abstract:
Effective renal plasma flow was determined by using I-131 labeled iodo-ortho-hippurate in 17 Chinese patients admitted to the coronary care unit with uncomplicated acute myocardial infarction. The first determination, immediately after admission, was significantly higher than the second determination done a week later, 444.5 +/- 153.9 vs. 371.1 +/- 124.9 ml/min (p < 0.02). The initial rise of effective renal plasma flow (ERPF) after acute myocardial infarction seemed to be correlated to the initial elevation of atrial natriuretic peptide (ANP), which was determined sequentially 6 times in each patient (91.3 +/- 39.4, 25.6 +/- 9.7, 37.4 +/- 12.3, 51.8 +/- 18.2, 65.6 +/- 20.8, 57.4 +/- 19.2 pg/ml, respectively). It was concluded that, in the presence of uncomplicated acute myocardial infarction, patients may show renal vasodilatation, and that the elevation of ANP may play some role in this.