Absolute Contraindications to tPA: A Clinical Reference

When a patient presents with acute ischemic stroke, the clock starts immediately—but not every patient is a candidate for thrombolytic therapy. Understanding absolute contraindications to tpa is essential for emergency clinicians making time-sensitive decisions. Contraindications for thrombolytic therapy fall into absolute and relative categories; absolute contraindications rule out administration entirely, while relative ones require risk-benefit analysis. The full list of thrombolytic therapy contraindications is well-defined in stroke protocols and should be reviewed before every tPA administration decision. Some providers also ask about oxygen contraindications in specific patient populations, which is a separate safety consideration. The list of contraindications for thrombolytics includes conditions where bleeding risk clearly outweighs the potential benefit of clot dissolution.

Absolute Contraindications to tPA in Acute Ischemic Stroke

The following conditions are generally accepted as absolute bars to tPA administration for stroke:

• Prior intracranial hemorrhage: Any history of bleeding inside the skull rules out thrombolytic use entirely.
• Significant head trauma or stroke in the past 3 months: Recent structural injury to the brain increases hemorrhage risk dramatically.
• Intracranial neoplasm, arteriovenous malformation, or aneurysm: These lesions can rupture with thrombolytic-induced pressure changes.
• Active internal bleeding: Excluding menstruation, any current hemorrhage is an absolute bar to tpa therapy.
• Suspected aortic dissection: Thrombolytics worsen dissection outcomes and are firmly contraindicated.
• Significant closed-head or facial trauma in the past 3 months: Same rationale as recent stroke.
• Blood pressure above 185/110 mmHg unresponsive to treatment: Uncontrolled hypertension substantially raises intracerebral hemorrhage risk during tPA infusion.

These thrombolytic therapy contraindications are non-negotiable in standard stroke protocols. Providing thrombolytics in the presence of any absolute contraindication to the drug creates a risk profile that no evidence base supports.

Relative Contraindications and Special Considerations

Relative contraindications for thrombolytics include recent major surgery (within 14 days), recent lumbar puncture, platelet count below 100,000, current anticoagulant use with elevated INR, and blood glucose below 50 or above 400 mg/dL. These require clinical judgment rather than automatic exclusion. The distinction between absolute and relative contraindications for thrombolytic therapy matters: absolute means do not administer; relative means weigh risks carefully with the team. Oxygen contraindications in specific respiratory conditions—particularly in COPD patients with hypercapnia—are unrelated to tPA but relevant in the broader emergency context when managing comorbidities.

Checking Contraindications Before Administration

Most institutions use a standardized tPA checklist that runs through absolute and relative contraindications systematically. This removes reliance on memory under pressure. Before ordering thrombolytics, verify the patient’s history for prior hemorrhagic stroke, confirm current blood pressure meets criteria, review current medications for anticoagulants, and check the CT scan for early infarct signs or hemorrhage. When contraindications for thrombolytics are unclear from history, err toward caution and involve neurology. Next steps: review your institution’s most current tPA eligibility checklist, confirm it aligns with AHA/ASA stroke guidelines, and conduct a team drill on identifying absolute contraindications quickly during simulated stroke activations.