View clinical trials related to Hypotension.
Filter by:The investigators would like to explore whether Hypotension Prediction Index during and immediately after surgery can be used to improve the accuracy of scores that predict postoperative problems.
Maternal hypotension is a common complication after spinal anaesthesia for caesarean delivery. Prophylaxis against post-spinal hypotension (PSH) during caesarean delivery would prevent serious maternal and fetal complications. Various methods had been investigated for prophylaxis against maternal hypotension. The basic components of management of PSH are: 1. Fluid loading. 2. Pharmacological agents. 3. Positioning protocols. Although Fluid loading is superior to non-loading protocols during caesarean delivery, the incidence of Post-spinal hypotension is high with all fluid loading protocols. Thus; the value of fluid loading in caesarean delivery could not be used solely for prevention of PSH. Using vasopressors for prophylaxis against PSH is nearly fundamental during caesarean delivery. However, vasopressors are not devoid of side effects such as reflex bradycardia after phenylephrine and fetal acidosis after ephedrine. Thus, combining vasopressor prophylaxis and non-pharmacological protocols would help to decrease the dose of vasopressors, and consequently decreasing their side effects. Ondansetron had been also reported as a useful prophylactic drug from PSH with minimal side effects. Positioning protocols, such as operating table tilting or flexing, the use of wedges or mechanical displacers, leg wrapping or sequential compression devices, head down and head up positioning aim to reversing aortocaval compression and/or increasing venous return. The sitting position for a short period after spinal block in order to slow the onset of the spinal block. Keeping the patient in the sitting position after spinal block would also prevent extension of local anaesthetic solution to upper thoracic dermatomes which is an important factor in preventing maternal hypotension. no previous reports had evaluated the impact of sitting position within the context of a multimodal protocol for prophylaxis against maternal hypotension. In this study, we aim to evaluate the impact of 2-minute sitting position after spinal anesthesia on maternal hemodynamics when combined with prophylactic norepinephrine infusion plus preoperative bolus of ondansetron. We aim to reach the best possible maternal hemodynamic profile in addition to maintenance of adequate block level.
Spinal anesthesia is the preferred technique for elective cesarean section as per ASA guidelines. Hypotension is the main complication of this technique and is secondary to both sympatholysis and its associated decrease in systemic vascular resistance and to the Bezold-Jarisch reflex, which causes hypotension and bradycardia in response to noxious stimuli detected in the cardiac ventricles. In pregnant patients, spinal anesthesia induced hypotension is worsened by compression of the aorta and inferior vena cava by the gravid uterus. In this setting, hypotension could lead to uteroplacental hypoperfusion and fetal distress. In its 2020 guidelines for enhanced recovery after cesarean section, SOAP states that preventing spinal-induced hypotension is an important strategy to enhance maternal and neonatal outcomes in cesarean delivery Recent studies showed that 5-hydroxytryptamine-3 receptor antagonists, mostly used as nausea and vomiting prophylaxis agents, also contributed to inhibit the Bezold-Jarisch reflex and its associated hemodynamic consequences. Ondansetron is the most studied molecule in this field. Many recent studies and meta-analyses show renewed interest in the use of norepinephrine as a first line agent for preventing and treating spinal anesthesia-induced hypotension in obstetric anesthesia practice instead of phenylephrine. Norepinephrine has the advantage of a better cardiac output and cardiac frequency as compared to phenylephrine without any fetal side effect. The combination of ondansetron and phenylephrine for the prevention of spinal anesthesia-induced hypotension has been studied, but not the combination of ondansetron and norepinephrine. The main objective of this study is to evaluate the sparing effect of a standard dose of ondansetron on norepinephrine consumption during elective cesarean section under spinal anesthesia by determining the effective dose in 50% of subjects (ED50) of a prophylactic norepinephrine infusion after receiving a single dose of 4 mg of ondansetron or a saline control.
When taking care of an emergency patient (Emergency Reception Service: UAS and Urgent Medical Assistance Service: SAMU), the installation of a peripheral venous route (VVP) is an important step. The benchmark method is the most widely used technique. This vascular access will allow the necessary therapy to be delivered quickly and efficiently. This can be difficult and sometimes doomed to failure for reasons related both to the patient (venous capital not very visible / felt or limited due to the profile of the patient), or sometimes also for reasons related to the patient. environment (limited lighting, difficult patient access). The only current alternatives lie in the use of a device such as the Intra-Bone Device (IID) or the installation of a central venous line. On the other hand, these alternatives are particularly invasive and / or very algogenic. There are other techniques, which are more affordable and "transportable" outside the hospital. Indeed, trans-illumination with a very short training seems to be a particularly interesting alternative. It allows, thanks to LEDs in contact with the skin, to backlight the superficial veins. It is proposed through this project to evaluate this tool for a category of patients considered "difficult" to infuse, both within hospital and outside hospital. The main objective of the study is to assess the effectiveness of the transillumination device, compared to the absence of such a device, on the placement of a peripheral venous line (PVP) in patients with a difficult vascular approach and managed in the emergency room and whose clinical condition does not require the installation of an intraosseous device. This is a multicenter, prospective, controlled, randomized and open clinical study, according to a cross-over design. The intervention evaluated is the placement of a PVR using the trans-illumination device. The control intervention is the placement of a PVR without this device, according to the reference method, which is the benchmark method. 400 patients presenting to the emergency room will be included in the centers of Nancy, Toul and Pont-à-Mousson. Depending on their randomization group, nurses will perform peripheral venous insertion by the transillumination method or by the control method.
The purpose of this study is to investigate the suitable infusion dose of phenylephrine for prophylaxis against postspinal anesthesia hypotension in parturients with preeclampsia undergoing cesarean section.
Postspinal hypotension (PSH) is common in obstetric anesthesia practice, with an incidence of up to 71 %. PSH can occur precipitously and, if severe, can result in both maternal and fetal/neonatal adverse events. Pregnant women with predelivery hypovolemia are at risk of cardiovascular collapse and the sympathetic blockade may severely decrease venous return. Hence, prevention of PSH is an essential element in obstetric anesthesia and fasting for aspiration prophylaxis may further add up to the hypovolemia for the patients not on maintenance fluids. Hemodynamic monitoring in obstetric patients has evolved during the last decade, with the development of minimally invasive and noninvasive continuous cardiac output (CO) monitors. Ultrasound (USG) is a method for noninvasive hemodynamic optimization in the ICU and ED, and it may be more helpful than other noninvasive methods. Transabdominal USG measurements of inferior vena cava (IVC) are noninvasive and thus are not associated with complications. USG of the IVC diameter is a useful and easy method for assessing a patient's volume status by calculating the IVC collapsibility index (IVCCI). Recently, the usefulness of point-of-care ultrasonographic examination, performed by anesthesiologists in real time, for perioperative management has been reported . Ultrasonographic studies have established the utility of measuring the inferior vena cava (IVC) or internal jugular Vein (IJV) for evaluating intravascular volume status . In particular, IVC diameter and collapsibility, obtained from ultrasonographic measurement, have been demonstrated to be predictors of hypotension after anesthetic administration.
Vasoplegic syndrome is characterized clinically by reduced systemic vascular resistance and normal or increased cardiac output. It is principally observed in cardiovascular and orthopedic interventions and is characterized by a systemic inflammatory response with the inability of the vascular endothelial muscles to contract and a resistance to the action of vasoactive drugs. This event extends the length of stay in the critical care area due to the need of vasoactive drugs. The investigators aim to assess the standardized application of midodrine in postoperative patients without sepsis and need of vasoactive drugs in order to reduce the length of stay in critical care area and for extension in hospital.
This research is expected to study ultrasonic measurement of internal jugular vein and inferior vena cava, which can be used as a good index to predict hypotension after anesthesia induction, and its measurement method is simple and quick.
This is observational study. The investigator will measure optic nerve sheath diameter by ultrasound on the eye after cesarean section under spinal anesthesia.
To compare haemodynamics and bispectral index values between conventional bolus propofol induction and target-controlled propofol infusion.