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[How many patients with acute myocardial infarction can be treated by thrombolysis?]
1I. Medizinische Abteilung des Allgemeinen Krankenhauses Harburg, Hamburg.
Insights
Thrombolytic therapy for acute myocardial infarction (MI) is severely limited by patient delays, diagnostic challenges, and numerous contraindications. Few eligible patients received timely treatment due to these significant barriers.
Area of Science:
- Cardiology
- Emergency Medicine
- Clinical Research
Background:
- Thrombolytic treatment is a critical intervention for acute myocardial infarction (MI).
- Treatment efficacy is significantly influenced by time to treatment, diagnostic accuracy, and patient-specific contraindications.
Purpose of the Study:
- To prospectively investigate the impact of time delays, diagnostic accuracy, and contraindications on thrombolytic treatment eligibility in acute MI patients.
- To identify common contraindications hindering thrombolytic therapy administration.
Main Methods:
- Prospective study of 173 consecutive patients with proven acute MI admitted between July and December 1986.
- Data collection included symptom onset, time to medical attention, transport duration, symptom presentation, ECG findings (ST elevation), and contraindications.
- Analysis of factors limiting thrombolytic treatment eligibility.
Main Results:
- Only 35% of patients arrived within the critical 3-hour window; significant delays were observed in seeking medical help and transport.
- Diagnostic ST segment elevation (2-3 mm) was present in only 34% of patients.
- Contraindications were present in 120 patients, drastically limiting thrombolytic treatment to only 4% within 3 hours and 7.5% within 6 hours of symptom onset.
Conclusions:
- Significant delays in patient presentation and transport, coupled with frequent contraindications, severely restrict the application of thrombolytic therapy in acute MI.
- Common contraindications include advanced age, hypotension, re-infarction, recent intramuscular injections, and pre-hospital resuscitation.
Abstract:
Thrombolytic treatment of acute myocardial infarction (MI) is limited by the time elapsed since onset, accuracy of the diagnosis and the presence of contra-indications. These factors were prospectively investigated in 173 consecutive patients with proven acute MI, admitted to a city hospital between July and December 1986. Fifty-eight patients (35%) were admitted within three hours of onset of symptoms. Delay in calling a doctor or ambulance was significant: 50% of patients waited for more than two hours after onset of symptoms, 40% more than three hours. Duration of transport to hospital averaged 30 min. Infarct-typical angina of at least 30 min had been present in 143 patients (83%). Atypical symptoms and silent MI was more frequent in the older patients. Diagnostic ST segment elevation of 2 to 3 mm on admission was present in 59 (34%) patients. After consideration of contraindications, present in 120 patients with altogether 165 potential factors, thrombolytic treatment was possible in only seven (4%) of those with the greater ST elevations within three hours after onset of symptoms and 13 (7.5%) within six hours. The most frequent contraindications were age (over 75 years), hypotension, re-infarction at the same site, intramuscular injections (unspecified drugs) within the preceding seven days, or resuscitation with cardiac massage before admission.