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Difficulty: MediumCardiovascular System

A 55-year-old man presents to a rural emergency department reporting severe, crushing, substernal chest pain of 45 minutes duration that radiates to his left jaw. He appears diaphoretic and dyspneic. His blood pressure is 145/90 mm Hg and heart rate is 92/min. A 12-lead electrocardiogram demonstrates 4 mm ST-segment elevations in leads V2 through V5. The facility does not have a cardiac catheterization laboratory. The nearest percutaneous coronary intervention (PCI)-capable center is located 140 minutes away by helicopter transport, and weather conditions are clear for flying. Arrange the following management steps in the most appropriate chronological sequence for this patient.

  1. 1Administer chewable aspirin
  2. 2Administer intravenous tenecteplase
  3. 3Transfer the patient via emergency transport to the PCI-capable facility
  4. 4Perform coronary angiography
  5. 5Optimize secondary prevention pharmacotherapy prior to discharge

Answer

The correct sequence begins with immediate administration of aspirin, followed by intravenous tenecteplase, transfer to a PCI-capable facility, subsequent coronary angiography, and finally optimization of secondary prevention medications.
The correct sequence reflects the standard of care for an acute ST-elevation myocardial infarction presenting to a non-PCI capable center with an anticipated transport time exceeding 120 minutes. Immediate stabilization with aspirin is followed by fibrinolytic therapy within 30 minutes. A pharmacoinvasive strategy then dictates immediate transfer to a capable center for early routine angiography and stenting. Finally, secondary prevention is initiated prior to hospital discharge.

Step-by-Step Solution

1
Administer immediate medical stabilization therapy.
Chewable aspirin is given upon identifying ischemic chest pain.
Aspirin permanently inhibits platelet cyclooxygenase, reducing thrombus expansion, and is the absolute first step in acute coronary syndrome management.
2
Assess the reperfusion timeline to select between primary PCI and fibrinolysis.
Intravenous tenecteplase is administered.
The guideline-directed threshold for primary PCI is a first medical contact-to-device time of less than 120 minutes. Since the transfer alone is 140 minutes, fibrinolytics must be given within 30 minutes of arrival.
3
Initiate a pharmacoinvasive strategy after fibrinolysis.
The patient is transferred to the PCI-capable hospital.
Fibrinolysis does not definitively treat the underlying ruptured plaque; all patients require transfer for early routine angiography or rescue PCI if reperfusion fails.
4
Assess and treat the culprit coronary lesion.
Coronary angiography is performed.
Visualizing the coronary tree allows for definitive stenting (PCI) of the residual stenosis, typically performed 2 to 24 hours after successful fibrinolysis.
5
Implement long-term cardiovascular risk reduction.
Secondary prevention pharmacotherapy is optimized.
Before discharge, initiating medications such as beta-blockers, ACE inhibitors, and high-intensity statins is required to prevent ventricular remodeling and recurrent ischemic events.

Key Concept

STEMI Reperfusion Strategy and Timeline
Estimated Time:1m 30s
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Topics

Cardiovascular System

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