Loh PH, Louis AA, Windram J, Rigby AS, Cook J, Hurren S, Nikolay NP, Caplin J, Cleland JGF. The immediate and long-term outcome of enhanced external counterpulsation in treatment of chronic stable refractory angina.
J Intern Med 2006;
259:276-84. [PMID:
16476105 DOI:
10.1111/j.1365-2796.2005.01604.x]
[Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND
Treatment of angina recalcitrant to conventional pharmacological therapy and revascularization remains problematic. Safe, effective and affordable treatments with high patient acceptability are desirable. Enhanced external counterpulsation (EECP) may fulfil these criteria better than many other proposed interventions.
OBJECTIVE
To examine the immediate and long-term effect of EECP in treatment of chronic stable refractory angina.
DESIGN
Prospective observational study of consecutive patients treated with EECP and follow-up for 1 year.
SETTING
Teaching hospital.
MAIN OUTCOME MEASURES
Canadian Cardiovascular Society (CCS) angina grading, weekly angina frequency and glyceryl trinitrate (GTN) use.
RESULTS
Sixty-one patients were treated with EECP and 58 completed a course of treatment. Further analysis is confined to those who completed EECP. About 52% of patients suffered from CCS III and IV angina prior to EECP. Immediately post-EECP, angina improved by at least one CCS class in 86% and by two classes in 59%. At 1-year follow-up, sustained improvement in CCS was observed in 78% of the patients. The median weekly angina frequency and GTN use were significantly reduced immediately after EECP [7 (4-14) vs. 1 (0-4) episodes per week and 7 (2-16) vs. 0 (0-2) times per week respectively, P < 0.0001; data in median (interquartile range)]. The reduction was sustained at 1-year follow-up. In 48 patients, their mean exercise time improved significantly after EECP [301 +/- 130 s vs. 379 +/- 147 s, P < 0.0001]. Major adverse treatment-related events were rare.
CONCLUSION
This study shows that for patients who fail to respond to conventional measures, a high proportion gain symptomatic benefit from EECP.
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