Effect of Remote Ischemic Preconditioning in Total Knee Arthroplasty on Thiol-Disulfi de Balance: a Randomized Controlled Study.

PURPOSE OF THE STUDY The purpose of this study was to minimize tourniquet-induced ischemia-reperfusion injury (IRI) in total knee arthroplasty (TKA) surgery using the remote ischemic preconditioning (RIPC) model, as well as to assess antioxidant balance with thioldisulfi de homeostasis (TDH). The secondary goal is to evaluate the impact of RIPC on TKA clinical outcomes. MATERIAL AND METHODS Patients in the ASA I-III group who underwent elective TKA were enrolled in this prospective, randomized, double-blind clinical research. TDH parameters were measured individually in groups with (Group I) and without (Group K) RIPC at the following times: preoperative (T0), right before the pneumatic tourniquet was opened (T1), 1 (T2), 6 (T3), and 24 (T4) hours after it was opened. In addition, at 3-hour intervals, the postoperative pain level was assessed using a visual analog scale (VAS). RESULTS This study included 60 cases (Group K; n=30, Group I; n=30). Both groups had equal native thiol, total thiol, disulfi de levels, disulfi de/native thiol, disulfi de/total thiol, and native thiol/total thiol ratios (p>0.05 for each). The change in native thiol, total thiol, and disulfi de values at T0 and T4 periods, however, was not statistically signifi cant for Group K (p=0.049, p=0.047, p=0.037, and p=0.217, p=0.191, p=0.220, respectively). At the 15th hour, VAS values in group I were considerably lower than in Group K (p=0.002). DISCUSSION This prospective, randomized, controlled trial examined how RIPC affected tourniquet-induced IRI-induced oxidative stress in TKA surgery. Lower native, total, and disulfi de levels at each postoperative time point were signifi cant. RIPC may reduce tourniquet-induced IRI-induced oxidative stress and TDH in TKA surgery. RIPC also reduced postoperative discomfort. CONCLUSIONS Our fi ndings suggest that RIPC may protect against the oxidative stress caused by IRI during limb surgery with a tourniquet and improve postoperative clinical outcomes. Key words: remote ischemic preconditioning, ischemia-reperfusion injury, thiol-disulfi de balance, oxidative stress, total knee arthroplasty.

The relationship between serum estrogen concentration and post-dural puncture headache: a retrospective study.

OBJECTIVE: Post-Dural puncture headache (PDPH) is a severe and undesirable complication for the patient and anesthesiologist. PDPH is more common in female patients. However, its relationship with plasma estrogen levels has not been demonstrated. This study aimed to investigate the relationship between estrogen levels and PDPH in patients who underwent spinal anesthesia for in vitro fertilization (IVF) with supraphysiological estrogen levels. PATIENTS AND METHODS: In this retrospective study, the data of patients between the ages of 18-45 with the following characteristics were included in the study: those who underwent IVF procedure between January 2021 and August 2022, in the ASA I-II risk group, and who underwent spinal anesthesia using a 25 G Quinke-tipped spinal needle at the L3-L4 or L4-L5 vertebra levels. The 48 patients in the study were in two groups according to their estradiol values: 'Supra physiological estradiol levels' (Group I=24 patients) and 'Normal estradiol levels' (Group C=24 patients). The relationship between PDPH and estrogen, progesterone, spinal needle diameter, and patient demographic characteristics were evaluated. RESULTS: The estrogen and progesterone levels of patients in Group I were higher than in Group C (p<0.001 and p<0.001, respectively). PDPH was present in 6 (25%) patients in Group I and 5 (20.8%) patients in Group C (p=0.731). There was no significant correlation between PDPH and estrogen and progesterone levels (p>0.05). CONCLUSIONS: Since there is no relationship between the supraphysiological estrogen level and PDPH, high serum estrogen level should not be considered as an additional risk factor for PDPH in the decision of anesthesia type for IVF procedure.

Does the menstrual phase affect gastric emptying? Prospective, observational study.

OBJECTIVE: Pulmonary aspiration of gastric content is a serious complication of anesthesia. It is unclear what effects different parts of the menstrual cycle have on how long it takes for the stomach to empty. This prospective observational study assessed the relationship between menstrual cycle phases and gastric emptying using ultrasonography (USG) in volunteers of reproductive age. PATIENTS AND METHODS: Between days 8-10 of the menstrual cycle in the follicular phase and days 18-20 of the luteal phase, a total of 24 healthy volunteers received four stomach USG procedures. In both phases, the gastric antrum was evaluated with USG in the right lateral decubitus position after fasting for 10 hours, followed by 2 hours of fasting after liquid intake and 6 hours of fasting after solid food intake. The gastric content, gastric antrum area, and estimated gastric volume determined whether the stomach was full or empty. RESULTS: A full stomach was detected in 8 (8.3%) out of 96 measurements performed on the volunteers. After liquid food intake, a full stomach was detected in 2 subjects in the luteal phase, while all the subjects had an empty stomach during the follicular phase (p=0.500). After solid food intake, a full stomach was detected in 6 subjects in the luteal phase, and again, all subjects had an empty stomach during the follicular phase (p=0.031). CONCLUSIONS: Ultrasound assessment of gastric volume in volunteers of reproductive age has shown that gastric emptying of solid foods is slowed during the luteal phase of the menstrual cycle.