View clinical trials related to Spinal Anesthesia.
Filter by:Spinal anesthesia induces bradycardia and hypotnesion, because itself decreases parasympathetic activity and increases sympathetic activity. These imbalance of autonomic nervous system can be measured by heart rate variability. Propofol and dexmedetomidine, which are used for sedation during spinal anesthesia, also affect autonomic nervous system, but the exact effects are not well known. The purpose of this study is measuring the effects of propofol or dexmedetomidine on autonomic nervous system in spinal anesthesia.
The recommended position of the mother under caesarean section after spinal anesthesia is 15 degrees left. However, recent research has challenged the basic principles and practicality of the left-turn 15 degree position. Higuchi et al used nuclear magnetic imaging to directly prove that in the supine position, the position of the full-left 30 degrees of the full-term pregnancy of the full-term pregnancy relieved the inferior vena cava compression and the left-angle of 15 degrees did not. Therefore, there are more and more controversies about the choice of cesarean section position. This experiment aims to explore effects of different positions (15 degrees left, 30 degrees left and supine) for elective cesarean section on lumbar anesthesia for fetal acid-base balance and maternal Hemodynamic.
Spinal anesthesia for caesarean section is associated with a decrease in systemic vascular resistance and cardiac output and may cause hypotension in a significant portion of the parturients. Hypotension during delivery may cause maternal and fetal complications. If parturients who are likely to develop hypotension after spinal anesthesia can be identified before surgery, anesthesiologists would have opportunity to take measures such as prophylactic vasopressor administration. Perfusion index (PI) measured by pulse oximetry reflects vasomotor tone which affects the degree of hypotension after spinal anesthesia. This is a non-invasive method of assessing the relative vascular tone with the use of pulse oximeter which calculates the ratio of pulsatile versus the non-pulsatile component of the blood flow. A lower PI indicates greater peripheral vasomotor tone. Pleth variability index (PVI) is calculated using maximum and minimum values of perfusion index during respiratory cycles. PVI is one of the dynamic indices that can predict fluid responsiveness. There are several studies investigating the predictive value of finger PI and PVI on hypotension after spinal anesthesia. However the aortocaval compression by the gravid uterus directly effects the lower extremity perfusion. So, in this study we aimed to investigate whether the right toe PI and PVI values at supine and left lateral positions can predict hypotension during caesarean section.
Spinal anesthesia for caesarean section is associated with a decrease in systemic vascular resistance and cardiac output and may cause hypotension in a significant portion of the parturients. Hypotension during delivery may cause maternal and fetal complications. If parturients who are likely to develop hypotension after spinal anesthesia can be identified before surgery, anesthesiologists would have opportunity to take measures such as prophylactic vasopressor administration. Perfusion index (PI) measured by pulse oximetry reflects vasomotor tone which affects the degree of hypotension after spinal anesthesia. This is a non-invasive method of assessing the relative vascular tone with the use of pulse oximeter which calculates the ratio of pulsatile versus the non-pulsatile component of the blood flow. A lower PI indicates greater peripheral vasomotor tone. Pleth variability index (PVI) is calculated using maximum and minimum values of perfusion index during respiratory cycles. PVI is one of the dynamic indices that can predict fluid responsiveness. The aim of this study is to investigate whether the PI and PVI values at different patient positions can predict hypotension during caesarean section.
Spinal anesthesia is often used for lower limb surgery in elderly. Hypotension is a side effect of spinal block. In this study, intravenous ephedrine and phenylephrine will be compared with each other to prevent spinal anesthesia-induced hypotension, which is defined in absolute terms as a systolic blood pressure < 100 mmHg or in relative terms as a 20% fall of systolic blood pressure from baseline.
Comparison between prophylactic continuous variable infusion of phenylephrine (starting dose 0,5mcg/kg/min) and norepinephrine tartrate (starting dose 0,1mcg/kg/min) to prevent hypotension and maintain cardiac output under spinal anesthesia during cesarean delivery.
This study aims to evaluate the efficacy of hyperbaric 5 mg bupivacaine + fentanyl 25 mcg versus hyperbaric 7.5 mg bupivacaine + fentanyl 25 mcg to lower incidence of hypotension
This study is to determine the minimum effective dose for intrathecal chloroprocaine in inguinal herniorrhaphy in outpatients using a Combined Spinal Epidural (CSE) anesthesia.
The aim of this study is to determine the ED90 of hyperbaric intrathecal bupivacaine for the super obese population undergoing cesarean section under a combined spinal epidural technique.
The aim of this study is to evaluate the effectiveness of low dose scheme with dexmedetomidine as an adjuvant. Taking in consideration optimum intraoperative surgical conditions, best post-operative pain free experience, and more stable hemodynamic.