Anaphylactoid reaction to recombinant tissue plasminogen activator.

Anaphylactoid reaction to recombinant tissue plasminogen activator for the thrombolytic treatment of acute ischemic stroke is an uncommon complication. An increased risk of anaphylaxis may be found in patients concomitantly being treated with angiotensin-converting enzyme inhibitors, as illustrated by this case report describing a patient who experienced an urticaric rash, hypotension, tachycardia, orolingual angioedema, and airway obstruction following intravenous administration of alteplase. Possible pharmacologic interactions resulting in excessive serum bradykinin and subsequent systemic hypersensitivity responses are discussed.