Background. Neuropathic pain is the main component of chronic postoperative pain syndrome. The use of magnesium sulfate for prevention of pain syndrome is theoretically based on its ability to N-methyl-D-aspartate receptors block in the spinal cord.
OBJECTIVE
To assess the effect of magnesium sulfate as an adjuvant analgesic for prevention of postoperative and chronic pain syndrome after surgery under combined anesthesia.
MATERIAL AND METHODS
The study included 112 patients randomized into 2 groups: magnesium sulfate infusion (n=37) and saline infusion (n=75). On the first postoperative day, ketorolac 30 mg was prescribed in all patients. After 2—3 days, pain relief was carried out at patient request. We analyzed pain severity on the first and the third postoperative days using the Brief Pain Inventory. After 3, 6 and 12 months, the Mac Gill pain questionnaire was used for two indicators (index of the number of selected descriptors and general rank index). Statistical analysis was performed using the Past 4.0 software (Sytel Studio). Wilcoxon criterion was used for pairwise comparisons of pain index, Fisher’s and Mann-Whitney tests — for analysis of Mac Gill scores.
RESULTS
For most categories, we found no significant between-group difference except for evaluative category in 3 months after surgery. In the main group, patients felt less effect of mild pain syndrome, and none had severe pain. At the same time, between-group difference of this indicator was significant (p=0.022).
CONCLUSION
The use of magnesium sulfate ensures higher quality of life in 3 months after surgery compared to the control group.