# Particularities in Surgical Results Following Obstetrical and Gynecological Surgery Using Pharmacological, Anesthesiological and Genetic Markers

## TL;DR

This study explores how genetic markers, specifically the OPRM1 receptor polymorphism, affect postoperative pain and surgical outcomes in obstetrical and gynecological patients.

## Contribution

The study identifies a correlation between the OPRM1 A11G polymorphism and postoperative pain management needs in patients with benign surgical outcomes.

## Key findings

- The OPRM1(+) mutation was more common in patients with benign surgical outcomes, such as uterine myomectomy and mastectomy.
- Patients with the OPRM1(+) mutation required higher analgesic doses for postoperative pain control.
- The study highlights the role of genetic markers in influencing variability in pain response to opioid therapy.

## Abstract

Aim: Finding innovative paraclinical parameters is necessary for advancing clinical research, in obstetrics and gynecology for subjective symptoms such as pain, especially in patients with a weakened immune system, following, for example, different obstetrical and gynecological surgeries. The purpose of this study was to analyze if genetic markers can correlate with the postoperative outcome and surgical results in obstetrics and gynecology. We wanted to analyze whether patients carrying the G gene responsible for the A11G polymorphism of the OPRM1 receptor really have a higher need for analgesic doses for postoperative pain control, depending on the histopathological results, benign or malignant tumors, dimensions of tumors, type of incision performed, and hospitalization period. Materials and Methods: We analyzed 111 patients, including both obstetrical and gynecological cases. Blood samples (2 mL) for DNA analysis were obtained before surgery in a tube containing EDTA as an anticoagulant and immediately stored at −20 °C until required for further use. The blood samples, which were collected at the time of intravenous cannulation before surgery, were analyzed for the presence of SNP 118AG. Results: We examined the mutation of the opioid receptor called OPRM1 for the polymorphism noted with AG with a plus sign (+) (present) in 24.3% of the patients, with a minus sign (−) (AA) (absent) in 66.7% of the patients, and with a result with both genes modified (GG) in 9%. We correlated the data obtained in histopathology and clinical anamnesis with these results. The OPRM1(+) morphine receptor mutation was more frequently encountered in patients with biopsy uterine curettage (60%) with benign results in anatomopathology, uterine myomectomy of at least 5 cm fibromas with benign results in anatomopathology (50%), Madden mastectomy (50%), interventional hysteroscopy (33.3%) with extraction of benign tumors such as polyps or endometrial hyperplasia, caesarean section-associated surgeries (20.7%), and ovarian cystectomy (20%) (p = 0.048) that had a final benign anatomopathology result. Conclusions: Pain management in the postoperative phase is difficult for clinicians because of the response of patients to opioid therapy. Some of this variability in pain response may result from single nucleotide polymorphisms (SNPs) in the human opioid receptor mu-1 (OPRM1) that alter receptor binding or signal transduction. Part of the difficulty in identifying genes and variants that affect postsurgical pain is the inconsistent findings and poor replicability of results.