Tenecteplase Dosing for Acute Myocardial Infarction
Tenecteplase is administered as a single intravenous weight-based bolus for acute myocardial infarction, with doses ranging from 30 mg to 50 mg based on body weight. 1
Weight-Based Dosing Algorithm
The 2025 ACC/AHA/ACEP/NAEMSP/SCAI guidelines provide the following weight-tiered dosing schedule 1, 2:
- <60 kg: 30 mg IV bolus
- 60-69 kg: 35 mg IV bolus
- 70-79 kg: 40 mg IV bolus
- 80-89 kg: 45 mg IV bolus
- ≥90 kg: 50 mg IV bolus
Administration: Given as a single intravenous bolus over 5-10 seconds 3
Key Clinical Context
When to Use Tenecteplase
Tenecteplase is indicated when:
- Primary PCI cannot be achieved within 2 hours from first medical contact 1
- Symptom onset is within 12 hours 1
- Patient has ST-segment elevation myocardial infarction
- No absolute contraindications exist
Important advantage: Tenecteplase demonstrated equivalent 30-day mortality to alteplase but with reduced noncerebral bleeding complications 1. The single bolus administration is operationally simpler than the 90-minute alteplase infusion.
Pharmacokinetics Supporting This Dosing
The FDA label confirms that tenecteplase exhibits linear pharmacokinetics across the 30-50 mg dose range, with plasma clearance of 99-119 mL/min 3. Body weight explains 19% of variability in plasma clearance, which is why weight-adjusted dosing optimizes therapeutic outcomes 3, 4, 5. The terminal half-life is 90-130 minutes, approximately 4-fold longer than alteplase, enabling single bolus administration 3.
Critical Contraindications to Screen
Absolute contraindications 1, 2:
- Any prior intracranial hemorrhage
- Ischemic stroke within 3 months (except acute ischemic stroke within 4.5 hours)
- Known intracranial neoplasm or vascular malformation
- Active bleeding or bleeding diathesis
- Severe uncontrolled hypertension (SBP >180 or DBP >110 mm Hg unresponsive to therapy)
- Significant closed-head/facial trauma within 3 months
- Intracranial/intraspinal surgery within 2 months
- Suspected aortic dissection
Post-Administration Management
Immediately after tenecteplase administration 1:
- Transfer to PCI-capable center is mandatory
- Early angiography between 2-24 hours with intent to perform PCI is recommended (Class I, Level B-R)
- If suspected failed reperfusion occurs, immediate rescue PCI is indicated
Common Pitfalls to Avoid
Do not use tenecteplase in patients with only ST-segment depression (unless true posterior MI suspected) due to increased risk of hemorrhagic stroke 1
Weight estimation errors: Use actual body weight when available. The dose tiers are designed to account for the relationship between weight and drug clearance 3, 4
Timing beyond 12 hours: While benefit is not established beyond 12 hours, consider administration in symptomatic patients with large area at risk or hemodynamic instability if PCI unavailable 1
Concomitant antiplatelet/anticoagulation: Administer aspirin 150-325 mg and weight-adjusted heparin (4000-5000 unit bolus followed by infusion targeting aPTT 50-75 seconds) 3