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Exercise stress testing in recently abstinent chronic cocaine abusers
Praveen Kanneganti1, Richard A Nelson, Susan J Boyd
1Department of Health and Human Services, Office of the Science Director, Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, Maryland 21224-2816, USA.
The American Journal of Drug and Alcohol Abuse
|June 28, 2008
Summary
Treadmill exercise stress testing (EST) in chronic cocaine users showed greater cardiovascular strain than intravenous cocaine challenges. These findings indicate EST may not offer additional diagnostic value for these individuals.
Area of Science:
- Cardiology
- Pharmacology
- Addiction Medicine
Background:
- Chronic cocaine use poses significant cardiovascular risks.
- Assessing cardiac function in cocaine users requires reliable diagnostic tools.
Purpose of the Study:
- To compare the cardiovascular effects of treadmill exercise stress testing (EST) with intravenous (IV) cocaine challenges in chronic cocaine users.
- To determine if EST provides additional diagnostic information beyond a controlled cocaine challenge.
Main Methods:
- 28 medically screened chronic cocaine users underwent both EST and IV cocaine challenges (25 mg or 50 mg).
- Cardiovascular parameters including heart rate and rate-pressure product were monitored.
- Echocardiography was performed to assess cardiac structure and function.
Main Results:
- EST resulted in significantly greater increases in heart rate and rate-pressure product compared to IV cocaine challenges.
- All subjects had normal EST and echocardiography results, with two exceptions showing septal wall hypokinesis.
- The cardiac workload induced by EST exceeded that of the tested IV cocaine doses.
Conclusions:
- Treadmill exercise stress testing may not offer incremental diagnostic benefits in medically screened chronic cocaine users.
- EST can impose a higher cardiovascular workload than low-dose IV cocaine.
- Further research is needed to refine cardiac assessment strategies for this population.
