This study was conducted to explore whether the non-synonymous single-nucleotide polymorphisms in SCN9A gene can predict individual basal pain perception and postoperative pain intensity in the general population undergoing upper abdominal surgery. Methods: Patients receiving elective upper abdominal surgery under general anesthesia were recruited into this study. Genotyping of SCN9A was carried out by direct sequencing. The investigators measured their preoperative pressure pain threshold (PPT) and pressure pain tolerance (PTO). The visual analog scale (VAS) was used for pain evaluation at rest during patient-controlled analgesia (PCA) treatment 0 h, 12 h ,24 h and 48h after operation. And the PCA press frequency and drug consumption were recorded.
Patients with the following diseases were excluded: known history of chronic pain, psychiatric diseases or communication disorders, diabetes mellitus, severe cardiovascular diseases, kidney or liver diseases with poor hepatic function, alcohol or drug abuse, heavy smoker, pregnancy or at the lactation period.
Study Type
OBSERVATIONAL
Enrollment
200
Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology
Wuhan, Hubei, China
Opioid Consumption Dose 48h After Operation.
Time frame: 48 hours after the operation
PCA Press Frequency 48h After Operation.
Time frame: 48 hours after the operation
The Visual Analog Scale 48h After Operation.
The visual analog scale (VAS) is used for pain evaluation at rest during patient-controlled analgesia (PCA) treatment 48h after operation. And the visual analog scale is from 0 to 10 which 0 represent no pain while 10 represent unbearable pain
Time frame: 48 hours after the operation
Preoperative Pressure Pain Threshold (PPT)
The probe of pressure algometer was positioned perpendicularly to the skin surface of the patient, and the investigator applied continuous pressure at approximately the same rate according to the visual LCD display on the algometer. subjects were asked to say "pain" when they started to feel pain during the stimulation. The value from the LCD was recorded as the pressure pain threshold.
Time frame: 12 hours before the operation
Preoperative Pressure Pain Tolerance (PTO)
The probe of pressure algometer was positioned perpendicularly to the skin surface of the patient, and the investigator applied continuous pressure at approximately the same rate according to the visual LCD display on the algometer. subjects were asked to say "ok" when they started to feel the pain became intolerable during the stimulation. The value from the LCD was recorded as the pressure pain tolerance.
Time frame: 12 hours before the operation
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