Abstract | STUDY OBJECTIVE: DESIGN: Prospective clinical study. SETTING: PATIENTS: INTERVENTION: In a subset of 29 patients, spironolactone was started at 12.5 mg/day, with the dosage titrated to 25 mg/day if tolerated. MEASUREMENTS AND MAIN RESULTS: Venous blood samples were collected from each patient. Serum procollagen type I and type III aminoterminal peptides (PINP and PIIINP) were determined by radioimmunoassay and compared between the 25 patients receiving low doses (< 50% of recommended target dose) and the 63 patients receiving high doses (> or = 50% of recommended target dose) of beta-blockers. Patients receiving low-dose beta-blockers had higher mean +/- SD PIIINP concentrations (6.6 +/- 3.5 vs 4.9 +/- 2.6 microg/L, p=0.03) and tended to have higher PINP concentrations (74.0 +/- 44.1 vs 57.1 +/- 28.6 microg/L, p=0.10) compared with those receiving high doses. A repeat blood sample was collected from the 29 patients who received spironolactone after 6 months of therapy. Changes in procollagen peptides also were compared in this subset between low-dose (9 patients) and high-dose (20 patients) beta-blocker groups. Low beta-blocker doses were associated with greater reductions in concentrations of PINP (median [intraquartile range] -14.3 microg/L [-9.8 to -19.3 microg/L] vs -2.5 microg/L [5.9 to -9.8 microg/L], p=0.02) and PIIINP (-1.4 microg/L [-0.9 to -2.4 microg/L] vs 0.1 microg/L [0.9 to -1.3 microg/L], p=0.045) with spironolactone therapy than high beta-blocker doses. In addition, 100% of the patients in this subset taking low-dose beta-blockers versus only 35% taking higher doses had reductions in both markers of cardiac fibrosis. CONCLUSION:
Spironolactone may benefit patients with heart failure who cannot tolerate upward titration of beta-blocker dosages, at least in terms of its effects on cardiac remodeling.
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Authors | Larisa H Cavallari, Kathryn M Momary, Vicki L Groo, Marlos A G Viana, Joseph R Camp, Thomas D Stamos |
Journal | Pharmacotherapy
(Pharmacotherapy)
Vol. 27
Issue 6
Pg. 801-12
(Jun 2007)
ISSN: 0277-0008 [Print] United States |
PMID | 17542763
(Publication Type: Clinical Trial, Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Adrenergic beta-Antagonists
- Carbazoles
- Diuretics
- Peptide Fragments
- Procollagen
- Propanolamines
- procollagen Type I N-terminal peptide
- procollagen Type III-N-terminal peptide
- Carvedilol
- Spironolactone
- Atenolol
- Metoprolol
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Topics |
- Adrenergic beta-Antagonists
(administration & dosage, pharmacology)
- Adult
- Aged
- Atenolol
(administration & dosage, pharmacology)
- Carbazoles
(administration & dosage, pharmacology)
- Carvedilol
- Diuretics
(administration & dosage, pharmacology)
- Dose-Response Relationship, Drug
- Female
- Fibrosis
(physiopathology)
- Heart Failure
(drug therapy)
- Humans
- Male
- Metoprolol
(administration & dosage, pharmacology)
- Middle Aged
- Peptide Fragments
(blood, drug effects, metabolism)
- Procollagen
(blood, drug effects, metabolism)
- Propanolamines
(administration & dosage, pharmacology)
- Prospective Studies
- Radioimmunoassay
- Spironolactone
(administration & dosage, pharmacology)
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