Coronary thrombolysis with facilitated absorption of intramuscularly injected tissue-type plasminogen activator.
Key result
Intramuscular administration of t-PA facilitated by hydroxylamine and electrical stimulation markedly increased peak blood levels to 431 ng/ml at 5 minutes and elicited prompt coronary thrombolysis.
Why the study?
Does facilitated intramuscular injection of t-PA improve absorption and induce coronary thrombolysis in preclinical models?
Population
Preclinical models (rabbits and dogs)
Design
Preclinical
Follow-up
5 min (for peak blood levels)
Authors
Discussion
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Implication
Does not support clinical use in AMI; leaves open translation of facilitated IM t-PA from animal models.
Structured PICO
Does facilitated intramuscular injection of t-PA improve absorption and induce coronary thrombolysis in preclinical models?
P
Population
56 male rabbits and a cohort of dogs with experimentally induced coronary thrombosis evaluated for absorption of intramuscular t-PA.
I
Intervention
Intramuscularly injected tissue-type plasminogen activator (t-PA) 1 mg/kg facilitated by hydroxylamine hydrochloride and electrical stimulation (in rabbits) or hydroxylamine (in dogs)
O
Outcome
Peak blood levels of t-PA (rabbits) and angiographically documented coronary thrombolysis (dogs)surrogate
Main Result
Absolute Event Rate: 431% vs 8%
p-value: p=<0.01
Facilitated intramuscular injection of t-PA achieves rapid therapeutic blood levels and coronary thrombolysis in animal models, suggesting a potential approach for prompt self-medication in acute myocardial infarction.
Limitations
- The fraction of administered t-PA appearing in the circulation was limited
- Potential risk of methemoglobinemia from hydroxylamine
- Risk of reperfusion arrhythmias requiring adjunctive therapy
Cite This Study
Sobel et al. (1985) studied Coronary thrombosis (n=56). Intramuscular t-PA with hydroxylamine and electrical stimulation vs. Intramuscular t-PA in buffer alone was evaluated on Peak plasma t-PA concentration at 5 minutes (ng/ml) (p=<0.01). Intramuscular administration of t-PA facilitated by hydroxylamine and electrical stimulation markedly increased peak blood levels to 431 ng/ml at 5 minutes and elicited prompt coronary thrombolysis.