"No alteplase" is an intended exposure concept that may be used in expressing what an Evidence is about.

<status value="draft"/> <description value="no alteplase"/> <actual value="false"/> <characteristic> <description value="no alteplase"/> <exclude value="true"/> <definitionCodeableConcept> <coding> <system value="http://www.nlm.nih.gov/research/umls/rxnorm"/> <code value="8410"/> <display value="alteplase"/> </coding> </definitionCodeableConcept> </characteristic> </EvidenceVariable>