Related Experiment Videos
The risks of thrombolysis in patients without acute myocardial infarction
J N Adams1, M Jamieson, R J Trent
1Cardiac Department, Aberdeen Royal Infirmary, Foresterhill, UK.
Insights
Altering thrombolysis criteria reduced unnecessary treatments for non-infarction patients. This change improved patient safety by minimizing complications from thrombolysis in patients without myocardial infarction.
Area of Science:
- Cardiology
- Medical Policy
- Patient Safety
Background:
- Thrombolysis administration for suspected myocardial infarction carries risks, especially when patients do not have infarction but experience complications.
- Physicians face challenges in accurately identifying patients who will benefit from thrombolysis.
- Unnecessary thrombolysis in non-infarction patients is a significant clinical concern.
Purpose of the Study:
- To evaluate the impact of revised thrombolysis administration criteria on the number of patients receiving treatment without confirmed myocardial infarction.
- To assess the effectiveness of ST elevation as a sole criterion for thrombolysis eligibility.
- To analyze changes in thrombolysis rates before and after policy modification.
Main Methods:
- Retrospective analysis of chest pain admissions during 1990 and 1992.
- Policy change implemented in 1991, restricting thrombolysis eligibility to patients with ST elevation.
- Comparison of thrombolysis administration rates and patient outcomes between the pre- and post-policy periods.
Main Results:
- A significant reduction (P < 0.01) in thrombolysis administration for patients without myocardial infarction was observed after implementing the ST elevation criterion (91 patients in 1990 vs. 27 in 1992).
- Among patients who received thrombolysis without infarction, only 20% had ST elevation or bundle branch block, and 35% had normal electrocardiograms.
- Serious complications occurred in 3% of these patients, including one death.
- The rate of thrombolysis in patients with confirmed myocardial infarction did not change significantly.
Conclusions:
- Implementing strict electrocardiogram (ECG) criteria, specifically ST elevation, significantly reduces the number of patients without myocardial infarction receiving thrombolysis.
- This policy change enhances patient safety by minimizing exposure to thrombolysis-related complications in non-infarction cases.
- The study highlights the importance of precise diagnostic criteria for thrombolysis to optimize treatment efficacy and safety.
Abstract:
The risk of administering thrombolysis to patients with suspected myocardial infarction who subsequently do not sustain an infarct, but develop complications associated with thrombolysis is of concern to all physicians. The objective of this study was to ascertain the effect of altering the criteria for the administration of thrombolysis on the number of patients who received thrombolysis in the absence of infarction. During 1990 and 1992 details of all admissions with chest pain were recorded. During 1991 the policy for the administration of thrombolysis was altered so that only patients with ST elevation were eligible. A total of 1473 patients were admitted with chest pain in 1990 and 1967 in 1992. Of the patients admitted in 1990, 663 (45%) had confirmed infarction of whom 378 (57.0%) received thrombolysis. In 1992, 855 (43%) were admitted with infarction and of these 450 (52.6%) had thrombolytic therapy. 118 patients had no evidence of myocardial infarction, but received thrombolysis. 91 (77.1%) were admitted in 1990 and 27 (22.9%) in 1992 (P < 0.01). Of these only 24 (20%) subjects had ST elevation or bundle branch block on the admission electrocardiograph and 41 (35%) had normal tracings. Four (3%) subjects had serious complications of whom one (0.8%) died. The implementation of ECG criteria resulted in a significant reduction in the number of patients without infarction who received thrombolysis, but did not significantly alter the rate of thrombolysis in those with definite myocardial infarction.