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URINE OSMOLALITY IN A POPULATION STUDY OF HYPERTENSION
Insights
Assessing kidney function in hypertension is crucial. Lowered urine osmolality in morning samples can indicate renal issues and is a valuable tool for population studies on cardiovascular disease.
Area of Science:
- Nephrology
- Cardiovascular Medicine
- Clinical Chemistry
Background:
- Hypertension frequently coexists with chronic kidney disease.
- Assessing renal function is vital in population studies of hypertension.
- Plasma creatinine is an unreliable screening test for reduced kidney filtration.
Purpose of the Study:
- To investigate the correlation between lowered urine osmolality and hypertension.
- To evaluate the utility of urine osmolality as a marker for renal involvement in hypertensive individuals.
- To highlight the importance of assessing renal function in population studies of cardiovascular disease.
Main Methods:
- A population study involving 855 randomly selected 50-year-old men.
- Correlation analysis between lowered early morning urine osmolality and hypertension.
- Description of a simple method for determining urine osmolality with a small standard error.
Main Results:
- Lowered urine osmolality in early morning samples was correlated with hypertension.
- This finding suggests renal involvement or altered water/solute excretion rhythms.
- Urine osmolality determination is a viable method for population studies.
Conclusions:
- Early morning urine osmolality is a useful indicator in population studies of cardiovascular disease.
- The described method for urine osmolality determination is practical and accurate.
- Assessing kidney function through urine osmolality provides valuable insights into hypertensive disease.
Abstract:
High blood pressure occurs in the majority of cases of chronic kidney disease, while renal damage is common in the more advanced cases of essential hypertension. In a population study of hypertensive disease, therefore, it is important to provide information on renal function. Determination of plasma creatinine concentration fails as a screening test since a normal or nearly normal plasma creatinine value does not necessarily exclude severe reduction of filtration ability. The specific gravity is the most widely used index of the concentration power of the kidneys. The disadvantage of this method is that considerable variation of specific gravity may occur in urines of like osmolality. In a sample of 855 50-year-old men selected at random, the authors of this article have correlated the lowered osmolality of an early morning urine specimen with hypertension. Renal involvement and/or altered rhythm of water and solute excretion can be the cause of lowered osmolality. The determination of the concentration of early morning urine samples has a legitimate place in population studies of cardiovascular diseases. A method of determining urine osmolality is described that requires relatively simple equipment and gives results with a small standard error.
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