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Biochemical investigation of hypertension
1University Department of Medicine, Dudley Road Hospital, Birmingham, UK.
Insights
Investigating hypertension causes reveals that while rare, some are surgically treatable. Assessing hyperlipidemia and glucose intolerance is crucial for managing high blood pressure effectively.
Area of Science:
- Cardiology
- Endocrinology
- Nephrology
Background:
- Hypertension affects a significant portion of the population, with underlying causes present in less than 5% of cases.
- Many secondary causes of hypertension are surgically remediable, highlighting the importance of early detection.
- Coexistent hyperlipidemia and glucose intolerance significantly worsen hypertension prognosis and may influence treatment choices.
Purpose of the Study:
- To outline the diagnostic approach for identifying surgically remediable causes of hypertension.
- To emphasize the importance of assessing hyperlipidemia and glucose intolerance in hypertensive patients.
- To guide general practitioners on biochemical testing and management of hypertension.
Main Methods:
- Review of biochemical tests for excluding renal and endocrine causes of hypertension.
- Identification of patient subgroups (e.g., young patients with severe hypertension) requiring specialized investigation.
- Assessment of hyperlipidemia and glucose intolerance in hypertensive individuals.
Main Results:
- Elementary biochemical tests can exclude most common secondary causes of hypertension.
- Young patients with very high blood pressure warrant detailed investigation in specialized centers.
- Screening reveals approximately 25% of the population have elevated blood pressure, with 10% requiring drug therapy.
Conclusions:
- While most hypertension is primary, identifying and treating secondary causes can be curative.
- Routine assessment of hyperlipidemia and glucose intolerance is recommended for all hypertensive patients.
- Most hypertensive patients can be managed in general practice with a single biochemical profile, but complex cases require specialist referral.
Abstract:
Underlying causes of hypertension are found in less than 5% of cases but they are frequently surgically remediable. Elementary biochemical tests are usually sufficient to exclude most renal and endocrine causes of hypertension. However, young patients with very high blood pressures merit more detailed investigation in specialized centres. As coexistent hyperlipidaemia or glucose intolerance substantially worsen the prognosis for a given level of blood pressure, these two risk factors are worth assessing in all hypertensive patients. Their presence may also alter the choice of antihypertensive drug therapy. About 25% of the population have raised blood pressure at first screening and about 10% are in need of drug therapy, so this represents an appreciable load on biochemical laboratories. Most patients, however, need only a single biochemical profile on one occasion, and should be exclusively managed in general practice.