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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Matthews, Kathleen A. Brenner, Michael J. Brenner, Allison C. |
| Spatial Coverage | United States |
| Description | Author Affiliation: Matthews KA ( Veterans Affairs Ann Arbor Healthcare System, Ann Arbor, Michigan. Electronic address: kathleen.matthews2@va.gov.) |
| Abstract | BACKGROUND: There are few data available examining the clinical impact of switching patients from hydrochlorothiazide (HCTZ) to chlorthalidone for blood pressure management. OBJECTIVES: The goal of this study was to compare within-patient clinic blood pressure readings, serum electrolyte levels, and renal function markers before and after a medication change from HCTZ to chlorthalidone in a veteran population. METHODS: This was a retrospective, pre- and postmeasure, self-controlled study. Veterans Affairs Ann Arbor Healthcare System patients switched from HCTZ to chlorthalidone between January 1, 2001, and January 31, 2012, who had at least 1 follow-up clinic blood pressure reading recorded between 2 and 8 weeks from the date of the medication change were included in the study. Mean pre- and postmeasure values for systolic and diastolic clinic blood pressures, serum potassium, serum sodium, serum calcium, serum creatinine, and blood urea nitrogen were compared by using a 2-tailed, paired t test with a significance level ( ) of 0.05. RESULTS: Of the 40 patients included in the study 95% were male, 65% were white, and the mean age was 64.9 (10.8) years. Both mean systolic (-15.8 mm Hg [95% CI, 8.9 to 22.6], P < 0.0001) and mean diastolic (-4.2 mm Hg [95% CI, 1.5 to 6.9], P = 0.0035) blood pressures showed statistically and clinically significant reductions after the medication change. A statistically significant decrease in mean sodium (-1.1 mmol/L [95% CI, 0.4 to 1.9], P = 0.003) and an increase in mean serum creatinine (0.06 mg/dL [95% CI, -0.09 to -0.02], P = 0.002) was observed; however, these changes may not be viewed as clinically significant by many practitioners. No statistically significant changes were observed in any of the other outcomes examined. Most patients (38 of 40) were taking at least 1 additional antihypertensive agent; 73% of patients were using ≥ 3 antihypertensive agents at the time of the medication change. CONCLUSIONS: In patients with hypertension already taking HCTZ, switching to chlorthalidone seems to further reduce systolic and diastolic blood pressures without any clinically significant changes in renal function or electrolyte levels. |
| File Format | HTM / HTML |
| ISSN | 01492918 |
| Issue Number | 9 |
| Volume Number | 35 |
| e-ISSN | 1879114X |
| Journal | Clinical Therapeutics |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2013-09-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Pharmacology Antihypertensive Agents Administration & Dosage Blood Pressure Drug Effects Chlorthalidone Hydrochlorothiazide Hypertension Drug Therapy Aged Adverse Effects Therapeutic Use Physiology Blood Urea Nitrogen Calcium Blood Creatinine Female Humans Male Middle Aged Potassium Retrospective Studies Treatment Outcome United States Veterans Journal Article |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology Pharmacology (medical) |
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