RESULTS
In the preoperative period, we evaluated 87 patients, among which 17 (19.5%) were excluded because of an MMSE < 24. The demographic characteristics of the patients are summarized in Table 1. The general and spinal anesthesia groups were similar in terms of mean age, BMI, distribution of gender, ASA scores, and comorbidity percentages (p > 0.05).
The intraoperative characteristics are summarized in Table 2. In the spinal anesthesia group, the duration of operation was significantly longer compared to the general anesthesia group (p = 0.003) . The intraoperative mean arterial pressure, SpO2, heart rate levels, and postoperative length of hospital stay were similar between groups.
The postoperative MMSE scores were significantly lower than the preoperative scores only in the general anesthesia group (p = 0.003), while the postoperative MoCA scores were lower than the preoperative scores in both the general and spinal anesthesia groups (p = 0.000 and 0.019, respectively, as seen in Table 3). The intraclass correlation coefficient (ICC) between the MMSE and MoCA was found to be statistically significant (p < 0.01; Table 4).
According to the postoperative MoCA measurements, the incidence of POCD (MoCA < 21) 17 was similar between the general and spinal anesthesia groups (31.9% [n = 15] and 34,7% [n = 8], respectively, with p = 0.810) and the overall incidence was 32.9% (n = 23). The gender distribution was similar between POCD and normal patients (the F/M [n%] ratios were 6/17 [21.6%/73.9%] and 7/39 [15.2%/84.8%], respectively, with p = 0.334). The mean age, duration of operation, and postoperative laboratory parameters were also similar between the POCD group (MoCA < 21) and normal group (MoCA ≥ 21) (Table 5).