This is a randomized, double-blind, active drug- and placebo-controlled, dose-escalation clinical study conducted in patients scheduled to undergo abdominal surgery. It aims to evaluate the tolerability, safety, pharmacokinetics, and efficacy of SYH9089 Injection for postoperative analgesia in these patients.
1. Fully understand the purpose and significance of this study, voluntarily participate in this study, voluntarily sign the informed consent, and voluntarily abide by the process of this study; 2. 18 years old ≤ age ≤75 years old, regardless of gender; 3. 19.0kg/m2≤BMI≤28.0kg/m2, ≥50.0kg for men and ≥45.0kg for women; 4. American Society of Anesthesiologists (ASA) grade I-II; 5. Elective abdominal surgery under general anesthesia, and the anticipated surgical incision is approximately 8-10 cm (inclusive), including at least one single incision of ≥ 5 cm in length; 6. Can understand the research process and the use of various scales involved in this study, and can effectively communicate with researchers.
Patientss with poorly controlled blood pressure despite medication: systolic blood pressure ≥160 mmHg and/or diastolic blood pressure ≥100 mmHg; or systolic blood pressure <90 mmHg;
12-lead ECG: QTcF ≥450 ms for males or ≥470 ms for females, or a history of severe arrhythmias such as second-degree type II or higher atrioventricular block, or a history of cardiac insufficiency;
Coagulation function: PT > ULN + 3 seconds and/or APTT > ULN + 10 seconds;
Liver function: ALT and/or AST ≥ 2 × ULN; TBIL ≥ 1.5 × ULN; ALB < 30 g/L;