Effect of a Pharmacist Intervention on Clinically Important Medication Errors After Hospital Discharge: A Randomized Trial

This article from the Ann Intern Med. 3 July 2012;157(1):1-10 shows that half of all cardiac patients had clinically important medication errors after having an explanation of their medications and how to take them by a pharmacist.  Could it be that the patient wasn't able to process the information after having been hospitalized with a heart condition?