Background:Pharmacist managed warfarin clinics can improve the anticoagulation status of
non-valvular patients. The first of such services was implemented at the
Cornwall Regional Hospital in Jamaica in 2013.Objectives:To assess the anticoagulation control of patients on warfarin therapy over
six months in the pharmacist managed warfarin clinic at Cornwall Regional
Hospital.Methods:Retrospective docket review for the period January 2014 to December 2016 was
done to include data of patients attending routine clinic appointments for
at least six months. Age, gender, date of visit, indication for warfarin
therapy, warfarin dose and International Normalized Ratio readings were
extracted. Percentage time spent in therapeutic range (TTR) was calculated
by month for six months using the Rosendaal linear interpolation method.
Patient anticoagulation status was categorized as poor
(TTR<40%), moderate (TTR=40-64%) or good
(TTR≥65%) and anticoagulation status at three months and six
months was compared.Results:For the period of assessment, 52 patients were identified; the median age was
58 years and 36 patients were males. Deep vein thrombosis was the main
indication for therapy (22 of 52) and median warfarin weekly dose ranged was
15.0-130 mg. At time of recruitment most of the patients were outside the
target INR range (43 of 52). Within one month, the median TTR attained was
31% [IQR 62-10]. This significantly improved by second month to
60% [IQR 82-23] (p=0.001). By month three, the proportion of patients
in good, moderate and poor anticoagulant status was 19/51, 15/51 and 17/51
respectively, which at six months changed to 23/51, 12/51. 16/51
respectively; thus, although coagulation status improved from month one to
three, there was no significant improvement from month three to month six
(p=0.31).Conclusions:The pharmacist managed warfarin clinic monitoring services were successful in
attaining TTRs >40% and sustaining these values over six
months. The services should therefore be encouraged.