Spinal Aneshtesia

The goal of this observational study is to compare spinal anaesthesia success in adults with and without previous lower back surgery. The main question it aims to answer is: \- Does previous lower back surgery affect the success of spinal anaesthesia on the first needle insertion? Participants will receive spinal anaesthesia as part of their usual medical care. Researchers will record needle attempts, procedure time, and anaesthesia effectiveness. Participation will not involve additional procedures or changes to routine care.

The aim of this prospective randomized double-blind study is to compare the effectiveness of routine antiemetic prophylaxis for the prevention of intraoperative nausea and vomiting (IONV) in non-fasted parturients undergoing emergency cesarean section under spinal anesthesia. Nausea and vomiting are common complications during cesarean delivery performed under spinal anesthesia and may negatively affect maternal comfort and perioperative safety. The incidence of these symptoms may be particularly increased in emergency cesarean sections involving non-fasted (full-stomach) parturients. This study compares two commonly used antiemetic strategies, namely 5-hydroxytryptamine-3 (5-HT3) receptor antagonists and dopamine receptor antagonists, to determine their relative effectiveness in preventing IONV during surgery. The findings are expected to contribute to optimization of antiemetic prophylaxis protocols, improvement of maternal comfort, and reduction of perioperative complications associated with nausea and vomiting during emergency cesarean delivery.

Spinal anesthesia is a common and preferred anesthetic technique for lower extremity orthopedic surgery in elderly patients. However, it can cause a significant drop in blood pressure (hypotension), especially in high-risk older patients with multiple medical conditions. This complication can lead to serious consequences such as heart attack, stroke, or death in vulnerable patients. This study investigates whether keeping patients in a lateral (side-lying) position for 15 minutes after spinal anesthesia - instead of immediately turning them onto their back (supine position) - can reduce the risk of hypotension. When a patient lies on their side after receiving spinal anesthesia with a heavy (hyperbaric) local anesthetic, the medication tends to stay concentrated on the lower (operative) side, resulting in a more limited nerve block. This may help preserve blood pressure stability. We will enroll 70 patients aged 65 years or older with high anesthetic risk (ASA physical status III or IV) scheduled for unilateral lower extremity orthopedic surgery under spinal anesthesia. Patients will be randomly assigned to two groups: one group will be kept in the lateral decubitus position (operative side down) for 15 minutes before being turned supine, and the other group will be turned supine immediately after spinal anesthesia. Blood pressure, heart rate, and oxygen saturation will be monitored continuously. The primary outcome is the incidence of hypotension during the first 15 minutes after spinal anesthesia.

This randomized, double-blind, controlled clinical trial investigates the efficacy of a sub-anesthetic dose of ketamine (0.5 mg/kg IV) in preventing post-spinal hypotension in patients undergoing elective orthopedic surgeries under spinal anesthesia. The study compares ketamine with placebo (normal saline) in terms of blood pressure stability and incidence of hypotensive episodes following spinal anesthesia.

This prospective randomized double-blinded controlled trial will include 60 pediatric patients aged 1 - 6 years old, both sexes, with American society of anesthesiologists (I and II) and undergoing elective infra-umbilical surgeries with anticipated duration ≤ 90 minutes. Patients will be randomly divided into two equal groups: Weight-based dosing (Group A) and age-based dosing group (Group B). Both groups will receive hyperbaric bupivacaine 0.5%. The aim of the study is to evaluate the effectiveness of using age based dosing of Bupivacaine compared with standard method of weight based dosing in pediatric spinal anesthesia.

Acute kidney injury (AKI) is a significant postoperative complication. Risk factors for AKI include impaired renal perfusion, decreased functional renal reserve, as well as advanced age, peripheral arterial disease, diabetes mellitus, renovascular disease and congestive heart failure. Mean arterial pressure (MAP) below 55-60 mmHg has been associated with postoperative AKI. Traditional diagnostic criteria for AKI include increased serum creatinine levels and oliguria. However, creatinine levels do not rise until more than half of renal function is lost. Serum and urine NGAL levels rise earlier-within 24-48 hours-making it a promising early biomarker. In our study, hypotension is defined as systolic blood pressure \<100 mmHg or a \>30% decrease in MAP. Patients requiring ephedrine under these conditions will be evaluated as the hypotension group and compared with non-hypotensive patients in terms of NGAL, BUN (blood urea nitrogen), creatinine, and GFR (Glomerular Filtration Rate) values at baseline and at the 4th postoperative hour.