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Physiology Lab Demonstration: Glomerular Filtration Rate in a Rat
Published on: July 26, 2015
Glomerular filtration rate in patients with Cushing's disease: a matched case-control study
P Haentjens1, L De Meirleir, R Abs
1Department of Endocrinology, Academisch Ziekenhuis van de Vrije Universiteit Brussel (AZ-VUB), Laarbeeklaan 101, B-1090 Brussels, Belgium.
Insights
Cushing's disease patients exhibit reduced glomerular filtration rate (GFR). Disease duration is a key predictor of impaired renal function, necessitating regular GFR monitoring and cardiovascular risk management.
Area of Science:
- Endocrinology
- Nephrology
- Cardiovascular Medicine
Background:
- Cushing's disease is linked to high atherosclerosis rates and persistent cardiovascular risk.
- The effect of Cushing's disease on renal function requires further quantification.
Purpose of the Study:
- To assess glomerular filtration rate (GFR) in Cushing's disease patients.
- To identify factors predicting GFR in this population.
Main Methods:
- A matched case-control study compared 18 Cushing's disease patients (active or cured) with healthy controls.
- Glomerular filtration rate (GFR) and micro-albuminuria were the primary outcome measures.
Main Results:
- Cushing's disease patients showed significantly lower GFR compared to controls (79 vs. 95 ml/min/1.73 m2).
- Disease duration emerged as the strongest predictor of reduced GFR.
- Micro-albuminuria prevalence was similar in both groups (5.5%).
Conclusions:
- Cushing's disease is associated with diminished GFR, persisting even after disease cure.
- Close patient monitoring, including GFR assessment and cardiovascular risk factor control, is crucial.
- Drug dosages may need adjustment based on individual GFR levels.
Background:
Patients with Cushing's disease have a high prevalence of atherosclerosis and maintain an increased cardiovascular risk even after cure of the disease. However, the impact of Cushing's disease on renal function remains to be quantified.
Objectives:
To evaluate glomerular filtration rate (GFR) and to identify predictors of GFR in patients with Cushing's disease.
Design And Methods:
We conducted a matched case-control study: 18 patients with active or cured Cushing's disease were compared with healthy population controls matched for age and sex. The main outcome measures were GFR and micro-albuminuria.
Results:
Patients with Cushing's disease had a lower GFR, as measured by 24-h creatinine clearance (79 versus 95 ml/min per 1.73 m2, P = 0.005) and estimated by the MDRD2 formula (75 versus 88 ml/min per 1.73 m2, P = 0.008). Multiple regression analyses indicated that disease duration was the strongest predictor for a worse GFR. The prevalence of micro-albuminuria was low (5.5% in both groups).
Conclusions:
Patients with Cushing's disease have a decreased GFR. Even if they are cured, close follow-up with strict control of cardiovascular risk factors and monitoring of GFR seems mandatory. Furthermore, the dosage of certain drugs should be adapted to the individual GFR.
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