SAMe-TT2R2 score for prediction of suboptimal time in therapeutic range in a Thai population with atrial fibrillation.

Rungroj Krittayaphong; Arjbordin Winijkul; Atthasit Pirapatdit; Pollakrit Chiewvit; Chulalak Komoltri; Warangkna Boonyapisit; Suchart Arunsiriwattana; Tanita Bunyapipat; Sirin Apiyasawat; Kasem Rattanasumawong; Ahthit Yindeengam

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SAMe-TT2R2 score for prediction of suboptimal time in therapeutic range in a Thai population with atrial fibrillation.

Author: Rungroj KRITTAYAPHONG ¹ ; Arjbordin WINIJKUL ¹ ; Atthasit PIRAPATDIT ¹ ; Pollakrit CHIEWVIT ¹ ; Chulalak KOMOLTRI ² ; Warangkna BOONYAPISIT ¹ ; Suchart ARUNSIRIWATTANA ³ ; Tanita BUNYAPIPAT ⁴ ; Sirin APIYASAWAT ⁵ ; Kasem RATTANASUMAWONG ⁶ ; Ahthit YINDEENGAM ¹
Author Information

1. Division of Cardiology, Department of Medicine, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand.
2. Department of Research Promotion, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand.
3. Surat Thani Hospital, Surat Thani, Thailand.
4. Lampang Hospital, Lampang, Thailand.
5. Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
6. Police General Hospital, Bangkok, Thailand.
Collective Name:Cool-AF Investigators
Publication Type:Journal Article
Keywords: SAMe-TT2R2 score; Thailand; non-valvular atrial fibrillation; time in therapeutic range; warfarin
From:Singapore medical journal 2020;61(12):641-646
CountrySingapore
Language:English
Abstract: INTRODUCTION:International normalised ratio (INR) control is an important factor in patients with non-valvular atrial fibrillation (NVAF) being treated with warfarin. INR control was previously reported to be poorer among Asians compared to Westerners. We aimed to validate the SAMe-TT2R2 score for prediction of suboptimal INR control (defined as time in therapeutic range [TTR] < 65% in the Thai population) and to investigate TTR among Thai NVAF patients being treated with warfarin.
METHODS:INR data from patients enrolled in a multicentre NVAF registry was analysed. Clinical and laboratory data was prospectively collected. TTR was calculated using the Rosendaal method. Baseline data was compared between patients with and without suboptimal INR control. Univariate and multivariate analyses were performed to identify variables independently associated with suboptimal INR control.
RESULTS:A total of 1,669 patients from 22 centres located across Thailand were included. The average age was 69.1 ± 10.7 years, and 921 (55.2%) were male. The mean TTR was 50.5% ± 27.5%; 1,125 (67.4%) had TTR < 65%. Univariate analysis showed hypertension, diabetes mellitus, heart failure, renal disease and SAMe-TT2R2 score to be significantly different between patients with and without optimal TTR. The SAMe-TT2R2 score was the only factor that remained statistically significant in multivariate analysis. The C-statistic for the SAMe-TT2R2 score in the prediction of suboptimal TTR was 0.54.
CONCLUSION:SAMe-TT2R2 score was the only independent predictor of suboptimal TTR in NVAF patients being treated with warfarin. However, due to the low C-statistic, the score may have limited discriminative power.