Effect of Kuanxiong Aerosol (宽胸气雾剂) on Patients with Angina Pectoris: A Non-inferiority Multi-center Randomized Controlled Trial

Objective To evaluate the effect and safety of Kuanxiong Aerosol (宽胸气雾剂, KA) on patients with angina pectoris. Methods Block randomization was performed to randomly allocate 750 patients into KA (376 cases) and control groups (374 cases). During an angina attack, the KA group received 3 consecutive sublingual sprays of KA (0.6 mL per spray). The control group received 1 sublingual nitroglycerin tablet (NT, 0.5 mg/tablet). Log-rank tests and Kaplan-Meier estimations were used to estimate the angina remission rates at 6 time-points after treatment (1, 2, 3, 4, 5, and >5 min). Logistic regression analysis was performed to observe the factors inflfluencing the rate of effective angina remission, and the remission rates and incidences of adverse reactions were compared for different Canadian Cardiovascular Society (CCS) classes of angina. Results The 5-min remission rates in the KA and control groups were not signifificantly different (94.41% vs. 90.64%, P >0.05). The angina CCS class signifificantly inflfluenced the rate of remission (95% confidence interval = 0.483–0.740, P 0.05), while they were signifificantly better for KA in the CCSI and II subgroups ( P