Prehospital-initiated thrombolysis

Area of Science:

• Cardiology
• Emergency Medicine
• Public Health

Background:

• Early reperfusion of infarct-related coronary arteries significantly lowers mortality rates in acute myocardial infarction (AMI).
• Patient delay, rather than transport or hospital delay, constitutes the primary barrier to timely AMI treatment.
• A substantial proportion (over 30%) of eligible AMI patients do not receive life-saving thrombolytic therapy.

Purpose of the Study:

• To assess the feasibility, safety, and efficacy of initiating thrombolysis before hospital arrival for AMI.
• To determine if prehospital thrombolysis can reduce mortality rates associated with acute myocardial infarction.

Main Methods:

• A systematic review of English-language clinical studies, abstracts, and review articles was conducted using MEDLINE.
• Eight randomized clinical trials and two meta-analyses comparing prehospital versus in-hospital thrombolysis were selected.
• Epidemiological data were sourced from the internet, and study data were synthesized for review.

Main Results:

• Prehospital thrombolysis is feasible, safe, and reduces treatment time, though not universally adopted in the US.
• Three of eight randomized trials showed reduced cardiac or total mortality with prehospital thrombolysis; meta-analyses suggest a 16-17% mortality reduction.
• Barriers to US implementation include diagnostic accuracy concerns, legal issues, and economic factors; ongoing studies explore community education and prehospital ECGs.

Conclusions:

• Clinical trials indicate prehospital thrombolytic therapy is safe and likely more effective than in-hospital administration.
• Widespread US implementation remains unproven due to persistent patient delays and logistical challenges.
• Future efforts should focus on patient education, rapid patient identification programs, and prehospital ECGs to increase thrombolytic treatment rates.