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Persistent left ventricular dysfunction after cocaine treatment in rabbits
C F Pilati1, A R Espinal, T F Pukys
1Department of Physiology, Northeastern Ohio Universities College of Medicine, Rootstown 44272.
Summary
Cocaine use diminishes heart function, and this effect may persist even after the drug leaves the body. In vitro studies show rapid recovery, suggesting complex mechanisms beyond direct heart cell action.
Area of Science:
- Cardiology
- Pharmacology
- Toxicology
Background:
- Cocaine use is associated with cardiovascular complications.
- The persistence of cocaine's cardiac effects after drug elimination is not fully understood.
Purpose of the Study:
- To investigate whether cocaine-induced cardiac dysfunction persists after the drug is eliminated from the body.
- To differentiate between in vivo and in vitro effects of cocaine on cardiac performance.
Main Methods:
- Rabbits received intravenous cocaine or saline, with hearts isolated and perfused cocaine-free 2.5 hours later.
- Left ventricular (LV) function was assessed in isolated hearts exposed to varying perfusate cocaine concentrations.
- LV contractility was evaluated by analyzing systolic and diastolic pressures relative to end-diastolic volume.
Main Results:
- Hearts from cocaine-treated rabbits showed diminished LV systolic performance, particularly at higher doses.
- In vitro, cocaine caused a dose-dependent decrease in LV function that rapidly reversed upon cocaine removal.
- The in vivo cardiac dysfunction was less reversible than in vitro effects, suggesting non-direct mechanisms.
Conclusions:
- Cocaine administration diminishes LV contractility.
- Cocaine-induced cardiac dysfunction may persist after in vivo drug elimination.
- The rapid reversibility in vitro suggests complex mechanisms, not solely direct myocyte action, underlie in vivo cardiotoxicity.