Health-related quality of life correlates with time in therapeutic range in children on anticoagulants with International Normalised Ratio self-monitoring.

BACKGROUND:Managing oral anticoagulant therapy with vitamin K antagonists remains challenging in paediatric medicine. AIMS:This study aimed to assess the correlation between time in therapeutic range and quality of life in children participating in a non-selective International Normalised Ratio self-monitoring and vitamin K antagonist education programme. METHODS:Children aged from 2 to 18 years and receiving vitamin K antagonist therapy were eligible for this prospective multicentre study. Clinical and demographic data were collected. Health-related quality of life was assessed using the PedsQL™ 4.0 questionnaire. Correlations between quality of life scores and time in therapeutic range were measured. RESULTS:A total of 121 children were included in the study (mean age 9.6±4.9 years). Cardiac conditions were the predominant indication for vitamin K antagonists. The mean time in therapeutic range was 0.78±0.15 overall, and 0.76±0.24 over the 3-month period before quality of life assessment. The mean total quality of life score was 76.2±18 in self reports, 71.4±22 in mother reports and 73.5±19 in father reports. The time in therapeutic range correlated with the total quality of life scores in self reports (r=0.22; P=0.04), mother reports (r=0.23; P=0.02) and father reports (r=0.28; P=0.02). The time in therapeutic range predominantly correlated with school functioning in self reports (r=0.38; P=0.002) and mother reports (r=0.40; P<0.001), and with physical functioning in father reports (r=0.28; P=0.03). CONCLUSIONS:Time in therapeutic range correlated with quality of life in children participating in a non-selective International Normalised Ratio self-monitoring and vitamin K antagonist education programme. Regular assessment of quality of life in patient education programmes contributes towards understanding the concerns and needs of patients.