A client with an acute myocardial infarction (MI) is given a thrombolytic medication, aspirin, and IV heparin in the emergency department. Which finding indicates the client is having a satisfactory response?

A. An aPTT that is 2 times the control value indicates that the heparin is effectively anticoagulating the blood, which is a desired outcome in managing MI to prevent clot formation. B. S3 heart sounds can indicate heart failure and are not a sign of a satisfactory response to MI treatment. C. Wide Q waves indicate a previous infarction but do not reflect the immediate effectiveness of the treatment. D. A positive guaiac test indicates gastrointestinal bleeding, which is a potential complication rather than a satisfactory response.