Mingwen Yang1, Zekang Ye1, Lianlian Mei1, Inam Ullah1, Chuchu Tan1, Guoyu Wang1, Qian Gu1, Yi Lu1, Samee Abdus1, Lu Shi1, Xiaoxuan Gong1, Jianling Bai2, John W Eikelboom3,4, Chunjian Li5. 1. Departments of Cardiology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China. 2. Department of Biostatistics, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu, China. 3. Department of Medicine, McMaster University, Hamilton, Ontario, Canada. 4. Thrombosis Service, Hamilton General Hospital, Hamilton, Ontario, Canada. 5. Departments of Cardiology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China. lijay@njmu.edu.cn.
Abstract
PURPOSE: This study aimed to investigate the pharmacodynamic effects of indobufen and low-dose aspirin in patients with coronary atherosclerosis. METHODS: In the first phase, 218 patients with coronary atherosclerosis were randomly assigned to receive aspirin 100 mg once daily (standard dose); 100 mg once every 2 days; 100 mg once every 3 days; 50 mg twice daily; 75 mg once daily; 50 mg once daily; or indobufen 100 mg twice daily for 1 month. In the second phase, 20 healthy subjects were treated with indobufen 100 mg twice daily for 1 week followed after a 2-week washout by aspirin 100 mg once daily for 1 week. The primary outcome was arachidonic acid-induced platelet aggregation (PLAA), and the secondary outcomes included plasma thromboxane B2 (TXB2) and urinary 11-dehydro-TXB2 (11-dh-TXB2) levels at the end of each treatment. RESULTS: In the first phase, compared with aspirin 100 mg once daily: all aspirin groups had similar suppression of PLAA whereas indobufen group had significantly less suppressed PLAA. Aspirin given every second or third day, and indobufen produced less suppression of plasma TXB2. All treatment regimens produced similar inhibition of 11-dh-TXB2. In the second phase, compared with aspirin, indobufen produced less suppression of plasma TXB2 at 8 h and 12 h after the last dose. CONCLUSIONS: Aspirin 50 mg twice daily, 75 mg once daily, and aspirin 50 mg once daily produce antiplatelet effects that are similar to aspirin 100 mg once daily. Aspirin given less often than once daily and indobufen 100 mg twice daily do not suppress platelets as effectively as aspirin 100 mg once daily.
PURPOSE: This study aimed to investigate the pharmacodynamic effects of indobufen and low-dose aspirin in patients with coronary atherosclerosis. METHODS: In the first phase, 218 patients with coronary atherosclerosis were randomly assigned to receive aspirin 100 mg once daily (standard dose); 100 mg once every 2 days; 100 mg once every 3 days; 50 mg twice daily; 75 mg once daily; 50 mg once daily; or indobufen 100 mg twice daily for 1 month. In the second phase, 20 healthy subjects were treated with indobufen 100 mg twice daily for 1 week followed after a 2-week washout by aspirin 100 mg once daily for 1 week. The primary outcome was arachidonic acid-induced platelet aggregation (PLAA), and the secondary outcomes included plasma thromboxane B2 (TXB2) and urinary 11-dehydro-TXB2 (11-dh-TXB2) levels at the end of each treatment. RESULTS: In the first phase, compared with aspirin 100 mg once daily: all aspirin groups had similar suppression of PLAA whereas indobufen group had significantly less suppressed PLAA. Aspirin given every second or third day, and indobufen produced less suppression of plasma TXB2. All treatment regimens produced similar inhibition of 11-dh-TXB2. In the second phase, compared with aspirin, indobufen produced less suppression of plasma TXB2 at 8 h and 12 h after the last dose. CONCLUSIONS: Aspirin 50 mg twice daily, 75 mg once daily, and aspirin 50 mg once daily produce antiplatelet effects that are similar to aspirin 100 mg once daily. Aspirin given less often than once daily and indobufen 100 mg twice daily do not suppress platelets as effectively as aspirin 100 mg once daily.
Authors: Roxana Mehran; Sunil V Rao; Deepak L Bhatt; C Michael Gibson; Adriano Caixeta; John Eikelboom; Sanjay Kaul; Stephen D Wiviott; Venu Menon; Eugenia Nikolsky; Victor Serebruany; Marco Valgimigli; Pascal Vranckx; David Taggart; Joseph F Sabik; Donald E Cutlip; Mitchell W Krucoff; E Magnus Ohman; Philippe Gabriel Steg; Harvey White Journal: Circulation Date: 2011-06-14 Impact factor: 29.690
Authors: F Cipollone; P Patrignani; A Greco; M R Panara; R Padovano; F Cuccurullo; C Patrono; A G Rebuzzi; G Liuzzo; G Quaranta; A Maseri Journal: Circulation Date: 1997-08-19 Impact factor: 29.690
Authors: John W Eikelboom; Jack Hirsh; Jeffrey I Weitz; Marilyn Johnston; Qilong Yi; Salim Yusuf Journal: Circulation Date: 2002-04-09 Impact factor: 29.690
Authors: Donna K Arnett; Roger S Blumenthal; Michelle A Albert; Andrew B Buroker; Zachary D Goldberger; Ellen J Hahn; Cheryl Dennison Himmelfarb; Amit Khera; Donald Lloyd-Jones; J William McEvoy; Erin D Michos; Michael D Miedema; Daniel Muñoz; Sidney C Smith; Salim S Virani; Kim A Williams; Joseph Yeboah; Boback Ziaeian Journal: Circulation Date: 2019-03-17 Impact factor: 29.690