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Contemporary practice patterns in the management of newly diagnosed hypertension
F A McAlister1, K K Teo, R Z Lewanczuk
1Division of General Internal Medicine, University of Alberta, Edmonton.
Insights
Physician management of hypertension often deviates from Canadian guidelines. Further research is needed to understand why evidence-based hypertension treatment protocols are not consistently followed.
Area of Science:
- Cardiology
- Internal Medicine
- Public Health
Background:
- Hypertension management guidelines aim to standardize patient care.
- Adherence to these guidelines is crucial for effective blood pressure control and reducing cardiovascular risk.
- Understanding current clinical practices is essential for identifying gaps in care.
Purpose of the Study:
- To assess the proportion of hypertension patients managed according to Canadian Hypertension Society guidelines.
- To identify deviations from recommended diagnostic and therapeutic protocols in primary care and internal medicine settings.
Main Methods:
- A retrospective review of medical records for 969 adult patients diagnosed with essential hypertension between 1993 and 1995.
- Data collected included initial laboratory tests, nonpharmacologic treatment advice, prescribed antihypertensive drugs, and documented contraindications.
Main Results:
- Significant variation was observed in diagnostic testing and pharmacologic management.
- Angiotensin-converting-enzyme (ACE) inhibitors were frequently prescribed as first-line therapy, while guideline-recommended beta-adrenergic blocking agents and thiazide diuretics were underutilized.
- A substantial proportion of patients received antihypertensives other than thiazides or beta-blockers without documented contraindications.
Conclusions:
- Contemporary management of hypertension shows considerable variability.
- Physician noncompliance with evidence-based Canadian Hypertension Society guidelines is evident.
- Further investigation is warranted to elucidate the reasons behind these practice variations.
Objective:
To determine what proportion of patients with hypertension are managed in accordance with guidelines established by the Canadian Hypertension Society.
Design:
Retrospective medical record review.
Setting:
Outpatients seen in primary care offices and internal medicine referral clinics in Edmonton.
Patients:
All 969 adults who presented with a new diagnosis of essential hypertension from Sept. 1, 1993, to Dec. 31, 1995.
Outcome Measures:
Initial laboratory tests performed, advice concerning nonpharmacologic treatment given, antihypertensive drugs prescribed and any contraindications to thiazide diuretics or beta-adrenergic blocking agents documented.
Results:
The mean age of the 969 patients in the sample was 52.5 years; 129 (13%) of the patients were older than 70 years of age; and 500 (52%) were women. Most of the patients (704, 73%) had mild or moderate diastolic hypertension. In the 617 patients who underwent laboratory tests related to hypertension, the creatinine level was determined in 466 (76%), the cholesterol level in 372 (60%), a urinalysis was conducted in 378 (61%), the serum potassium level was checked in 343 (56%), the sodium level in 323 (52%) and an electrocardiogram was performed in 303 (49%). Liver function tests, which are not recommended in the guidelines, were performed in 338 patients (55%). Although there were differences in prescribing among physicians in the 711 patients given first-line therapy, most (238, 34%) were prescribed angiotensin-converting-enzyme (ACE) inhibitors. Lifestyle modification, without drug therapy, was suggested for 180 (25%) of the patients. Although the guidelines recommend their use for first-line drug therapy, only 82 patients (12%) were given beta-adrenergic blocking agents and only 75 (11%) were given thiazide diuretics. Of the patients who were prescribed an antihypertensive other than a thiazide or beta-adrenergic blocking agent as first-line drug therapy, only 161 (43%) had a documented contraindication to thiazides or beta-adrenergic blocking agents.
Conclusions:
There is variation in the contemporary care of patients with hypertension. Further studies are required to determine the reasons underlying physicians' noncompliance with the evidence-based guidelines established by the Canadian Hypertension Society.
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