Abstract
To the Editor: In the recent FRIC study,1 the subheading on page 65 states “Anti–Factor Xa Activity and aPTT Values in the Acute Phase,” but no activated partial thromboplastin time (aPTT) values were provided. Because one of the measures of performance of unfractionated heparin (UFH) dosing is the aPTT achieved, the reader cannot interpret the degree of anticoagulation achieved with UFH if no aPTT values are provided. Because aPTT measurement was mandated per protocol at 6 and 12 hours as well as daily through 48 hours, these median aPTT values should be reported as well as the percentages of patients below and above …
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