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. 1999 Jul;82(1):82–88. doi: 10.1136/hrt.82.1.82

Clinical outcome of patients treated with spinal cord stimulation for therapeutically refractory angina pectoris

I TenVaarwerk 1, G Jessurun 1, M DeJongste 1, C Andersen 1, C Mannheimer 1, T Eliasson 1, W Tadema 1, M Staal 1
PMCID: PMC1729112  PMID: 10377314

Abstract

OBJECTIVE—To determine morbidity and mortality characteristics in patients treated with electrical neuromodulation for refractory angina pectoris.
DESIGN—A retrospective multicentre study of patients treated with spinal cord stimulation between 1987 and 1997; 21 centres were contacted and 14 responded.
SETTING—Specialist centres worldwide.
PATIENTS—Questionnaires were returned on 517 patients, of whom 71% were male. One was lost to follow up. Mean (SD) age was 63.9 (10.1) years. Duration of angina pectoris was 8.1 (6.3) years.
RESULTS—Before spinal cord stimulation, 66% of the patients had experienced myocardial infarction, 68% had three vessel disease, and in 24% the left ventricular ejection fraction (LVEF) was ⩽ 40%. Percutaneous transluminal coronary angioplasty and bypass surgery were performed in 17% and 58% of the subjects, respectively. During a median follow up of 23 months (range 0 to 128), 103 patients died (52 from a cardiac cause, 25 from a non-cardiac cause, and 26 from an unknown cause). Annual all cause mortality was 7-8%; annual cardiovascular fatality was 3.5-5%. Mortality was univariately related to sex, number of diseased vessels, number of revascularisation procedures, previous myocardial infarction, LVEF, insulin dependent diabetes, β blocking agents, and angiotensin converting enzyme inhibitors. Multiple variate analysis showed that LVEF, sex, β blockers, and age ⩾ 71 years were independent predictors of mortality. During spinal cord stimulation, New York Heart Association functional class improved from 3.5 to 2.1 (p < 0.01); 25 of the deceased patients (24%) and 32 survivors (8%) experienced myocardial infarction; hospital admissions were significantly (p < 0.001) more common in the deceased group (66% v 37%).
CONCLUSIONS—The clinical outcome of patients with intractable angina is not adversely affected by the chronic use of neurostimulation.


Keywords: angina pectoris; spinal cord stimulation; pain

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Figure 1  .

Figure 1  

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Kaplan-Meier survival curve for entire group of patients. SCS, spinal cord stimulation.

Figure 2  .

Figure 2  

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Kaplan-Meier survival curve for patients with a left ventricular ejection fraction of ⩽ 40% and > 40% (see text for details). SCS, spinal cord stimulation.

Figure 3  .

Figure 3  

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Kaplan-Meier survival curves for patients with age ⩽ 71 years and > 71 years (see text for details). SCS, spinal cord stimulation.

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