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Hypertension in autosomal dominant polycystic kidney disease
P E Bell1, K F Hossack, P A Gabow
1University of Colorado School of Medicine, Denver.
Insights
Hypertension in Autosomal dominant polycystic kidney disease (ADPKD) is linked to increased cardiac preload and renal vascular resistance, even before kidney function declines. This suggests renal factors contribute to elevated blood pressure in ADPKD patients.
Area of Science:
- Nephrology
- Cardiology
- Hypertension Research
Background:
- Autosomal dominant polycystic kidney disease (ADPKD) frequently presents with hypertension before significant renal function decline.
- Understanding the mechanisms linking ADPKD, hypertension, and cardiac function is crucial for early intervention.
Purpose of the Study:
- To investigate cardiac preload and renal hemodynamics in hypertensive versus normotensive ADPKD patients.
- To explore the relationship between renal vascular resistance, cardiac index, and hypertension in ADPKD.
Main Methods:
- Comparison of plasma atrial natriuretic factor (ANF) and cardiac index between hypertensive and normotensive ADPKD cohorts.
- Assessment of renal vascular resistance and glomerular filtration rate (GFR) in both patient groups.
Main Results:
- Hypertensive ADPKD patients showed significantly increased cardiac preload markers (ANF, cardiac index) compared to normotensive ADPKD patients.
- Elevated renal vascular resistance was observed in hypertensive ADPKD patients, despite comparable GFR levels to normotensive ADPKD patients.
Conclusions:
- Hypertension in ADPKD is associated with increased cardiac preload and renal vascular resistance, independent of glomerular filtration rate.
- Renal mechanisms, potentially involving impaired response to increased cardiac output or venoconstrictors like angiotensin, may drive hypertension in ADPKD.
Abstract:
Autosomal dominant polycystic kidney disease (ADPKD) has been shown to be associated with a greater than 50 percent incidence of hypertension prior to deterioration in renal function as assessed by glomerular filtration rate. The present study provides evidence for increased cardiac pre-load, as assessed by plasma atrial natriuretic factor (ANF) and cardiac index, in hypertensive as compared to normotensive ADPKD. The hypertensive ADPKD patients exhibited an increased renal vascular resistance as compared to the normotensive patients in spite of comparable glomerular filtration rates. It is hypothesized that the renal involvement of hypertensive ADPKD patients causes an impaired renal response to the observed increase in cardiac index, and also may release a venoconstrictor (such as angiotensin) which contributes to the enhanced cardiac pre-load and thus the hypertension.