Acute coronary syndrome
1MDHU Northallerton, Friarage Hospital, Northallerton, North Yorkshire, DL6 1JG. masud999@doctors.org.uk
Insights
Prompt treatment for acute coronary syndromes is crucial. Early ECG, oxygen, aspirin, and reperfusion therapy for ST-elevation myocardial infarction significantly improve outcomes and reduce mortality.
Area of Science:
- Cardiology
- Emergency Medicine
- Pre-hospital Care
Background:
- Acute coronary syndromes (ACS) present heterogeneously with varying coronary atherosclerosis severity and risk of myocardial infarction.
- Individualized pre-hospital treatment decisions are essential, considering patient history, ECG, available resources, and transfer time.
Purpose of the Study:
- To outline optimal pre-hospital management strategies for patients presenting with acute coronary syndromes.
- To emphasize timely diagnosis and initiation of appropriate interventions to improve patient outcomes.
Main Methods:
- Initial assessment including history, physical examination, and rapid 12-lead ECG within 5 minutes.
- Administration of oxygen, aspirin, nitrates, and opioid analgesia for acute ischemic chest pain.
- Consideration of immediate reperfusion therapy for ST-elevation myocardial infarction (STEMI) or new left bundle branch block (LBBB).
Main Results:
- Prompt anti-platelet and fibrinolytic therapy in STEMI cases demonstrates unequivocal benefits in reducing mortality and morbidity.
- Pre-hospital fibrinolysis is indicated for acute infarction if transfer exceeds 30 minutes and pain onset is within 12 hours.
- Patients without ECG evidence of infarction still require transfer to a medical facility with continued supportive care en route.
Conclusions:
- Timely recognition and management of ACS in the pre-hospital setting are critical for improving patient survival and reducing complications.
- Standardized protocols for ECG interpretation and therapeutic interventions, including pre-hospital fibrinolysis, are vital for STEMI patients.
- Appropriate medical care, including anticoagulation and beta-blockers, should be administered to high-risk ACS patients during transport.
Abstract:
Acute coronary syndromes encompass a heterogenous group of patients with different clinical presentations, who have differences in both the extent and severity of underlying coronary atherosclerosis and who have different degrees of risk of progression to myocardial infarction. For each patient, the pre-hospital practitioner should make individual treatment decisions based on the history and examination, the ECG findings, the facilities and diagnostic equipment available and the transfer time to the nearest appropriate hospital. Patients with acute ischaemic chest pain should have oxygen, aspirin, nitrates and opioid analgesia. A 12 lead ECG should be performed within 5 minutes of initial assessment. If the ECG reveals ST-segment elevation or presumed new LBBB, this signifies acute myocardial infarction and in most cases immediate reperfusion therapy should be considered. The evidence of benefit in terms of mortality and morbidity following prompt anti-platelet and fibrinolytic therapy in such cases is unequivable. Pre-hospital fibrinolysis is now well established and should be undertaken in patients with acute infarction on clinical and ECG grounds if the transfer to hospital is likely to exceed 30 minutes and it is less than 12 hours since the onset of pain. Patients with no ECG evidence of infarction may still be at considerable risk and should still be conveyed to the nearest appropriate medical facility. Whilst en-route, they should receive aspirin, nitrates, low molecular weight heparin (LMWH) and beta blockers provided there are no contra-indications.
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