Interesting study published in the April 26, 2010 issue of the Archives of Internal Medicine entitled "Association of Interruptions With an Increased Risk and Severity of Medication Administration Errors". From the abstract:
Each interruption was associated with a 12.1% increase in procedural failures and a 12.7% increase in clinical errors. The association between interruptions and clinical errors was independent of hospital and nurse characteristics. Interruptions occurred in 53.1% of administrations (95% confidence interval [CI], 51.6%-54.6%).
Click here to access the abstract.