View clinical trials related to Hypotension.
Filter by:The Autonomic (or "automatic") Nervous System (ANS) regulates internal processes, including control of heart rate and blood pressure (BP). When someone stands, and gravity tries to pull blood away from the brain, the ANS works to maintain BP and brain blood flow. Neurogenic Orthostatic Hypotension (NOH) occurs when our "fight-or-flight" part ("sympathetic") of the ANS fails. BP can drop a lot when upright, reducing blood flow and oxygen delivery to the brain, and this can cause symptoms of light-headedness, nausea, and fainting. One solution to help counter the effects of NOH may be to increase sympathetic activity by breathing higher levels of carbon dioxide. In healthy volunteers, small increases in the amount of inhaled carbon dioxide has been shown to increase BP in the upright position, and this improves symptoms! The objectives of the current study are to apply carbon dioxide in patients with NOH and healthy controls to: (a) evaluate the effects of breathing carbon dioxide on BP and brain blood flow, and (b) determine if a device that increases carbon dioxide while standing will work as a new therapy
Intraoperative hypotension is common in patients having non-cardiac surgery under general anesthesia and is associated with major postoperative complications including myocardial injury, AKI, and death. Intraoperative hypotension is also common in patients having vascular surgery. To treat intraoperative hypotension, vasopressors - such as norepinephrine - and fluids are used. However, high-dose vasopressor and excessive fluid therapy are also associated with postoperative complications. The depth of general anesthesia may be a modifiable cause of intraoperative hypotension. Deep levels of general anesthesia may cause cardiovascular depression with intraoperative hypotension and higher vasopressor requirements. Optimal depth of general anesthesia is defined as a state in which the patient is at low risk of recall of intraoperative events while maintaining blood pressure stability with minimal intervention. Depth of anesthesia can be confirmed using clinical signs, the concentration of inhaled or intravenous anesthetics, or neuromonitoring such as processed electroencephalography (pEEG). pEEG presents an opportunity to monitor changes in human brain electrical activity and to help estimating the patients' level of (un)consciousness and the optimal depth of anesthesia. EEG-guided general anesthesia may thus decrease norepinephrine doses needed to treat intraoperative hypotension in patients having surgery.
Maternal hypotension after spinal block is a common complication after subarachnoid block in this population whose incidence reached 60% in many reports. Hypotension is associated with maternal and neonatal complications; therefore, it is highly recommended to use vasopressors, prophylactically and interactively, for prompt control maternal blood pressure. Despite the presence of various preventive regimens (fluid loading, maternal positioning, and vasopressors), many mothers develop intraoperative episodes of hypotension which requires the use of a vasopressor bolus. Norepinephrine (NE) is an alpha adrenergic agonist with weak beta adrenergic agonistic activity; and is increasingly used in obstetric anesthesia with acceptable maternal and neonatal outcomes. NE bolus could be used for rapid correction of maternal blood pressure in a dose which variedranged between 3.7-10 mcg. Till date, al the available data for the management of maternal hypotension did not differentiate between severe and non-severe hypotension. The incidence of severe maternal hypotension (systolic blood pressure ≤60% of baseline) ranged between 7-20%. In a recent report, Hassabelnaby et al compared 6 mcg and 10 mcg NE boluses in management of maternal hypotension and found that the doses had the same success rate (≈90%); however, most of the participants in the mentioned study had non-severe hypotension. Therefore, we hypothesize that severe hypotension should be separately investigated for the possible superiority of the higher over the lower dose of NE bolus. Insufficient NE bolus would lead to failed management and prolonged hypotensive episode, whereas a higher dose might lead to reactive hypertension and/or bradycardia, which is sometimes severe. Therefore, determining the optimum dose for NE bolus would enable proper control of maternal hemodynamic profile
Maternal hypotension after spinal block is a common complication after subarachnoid block in this population. The incidence of maternal hypotension is nearly 60% when prophylactic vasopressors are not used. Therefore, it is highly recommended to use vasopressors, preferably as continuous infusion, for prophylaxis rather than delaying their use until hypotension occurs. Phenylephrine (PE) is the recommended drug for prophylaxis against hypotension during cesarean delivery; however, the use of PE is commonly associated with decreased heart rate and probably cardiac output because PE is a pure alpha adrenoreceptor agonist. Introduction of NE in obstetric practice had shown favorable maternal and neonatal outcomes and was associated with higher heart rate and cardiac output compared to PE. However, there is still some mothers who develop bradycardia and diminished cardiac output with the use of NE. The most desired scenario during hemodynamic management of mothers during cesarean delivery would achieve the least possible incidences of maternal hypotension, bradycardia and reactive hypertension. Therefore, it is warranted to reach a vasopressor regimen with the most stable hemodynamic profile. In the last year, epinephrine was reported for the first time in obstetric practice with acceptable safety on the mother and the fetus. However, there is still lack of data about the most appropriate dose for infusion during cesarean delivery. This study aims to compare three prophylactic infusion rates for epinephrine during cesarean delivery.
Hemodynamic instability is frequent during surgery and intraoperative hypotension is associated with excess morbidity and excess mortality in high-risk patients. In major abdominal surgery the incidence of intraoperative hypotension remains high. For the past few years, some teams have proposed evaluating norepinephrine as a first-line drug in the presence of hypotension or even before hypotension occurs Thus in obstetrics, the preventive use of norepinephrine for cesareans performed under spinal anesthesia was associated with a reduction in the incidence of hypotension per operative without deleterious effect for the newborn or parturient. In the absence of any observed complications, several teams began to use noradrenaline prophylactically in other surgery. However, no study has demonstrated its benefit, particularly the term of surgical complication in abdominal surgery. The objective of this work is to assess the preventive use of norepinephrine in major abdominal surgery on the occurrence of intraoperative hypotension, postoperative organ dysfunction and postoperative medical and surgical complications.
Blood pressure optimization has been considered as a crucial factor to avoid perioperative vital organ hypoperfusion, and perioperative hypotension has been addressed as a risk factor for complications and adverse clinical outcomes. Hypotension prediction index (HPI) is an novel machine-learning derived parameters, and was developed to predict the risk of future hypotension.Series of clinical studies have verified its clinical efficacy in avoiding perioperative hypotension. Major orthopedic surgeries, such as spine surgery, joint surgery, long bone fracture surgery, are quite common in elder people, who are vulnerable to perioperative adverse outcomes.Thus the investigator design this study to testify the clinical efficacy of implementing HPI in perioperative goal-directed hemodynamic therapy in elder patients receiving major orthopedic surgery.
Despite prophylactic measures, hypotension remains a common side-effect of spinal anesthesia. Electroacupuncture influences hemodynamics. We hypothesized that transcutaneous electrical acupuncture point stimulation (TEAS) at traditionally used acupuncture points would reduce the severity of hypotension after spinal anesthesia in geriatric patients undergoing hernia surgery.
This prospective cohort study aim to investigate the ability of multiple types of assessments including 1) the modified Venous Excess Ultrasound (VExUS) assessment, 2) non-invasive estimation of absolute blood volume (ABV), and 3) change in carotid Doppler at the start of IKRT to predict IDHE in acutely ill hospitalized patients. The secondary aim will be to determine whether each modality improves the prediction of IHDE compared to the evaluation of the attending physician and whether they also predict cerebral hypoxia during IKRT measured by near-infrared spectroscopy (NIRS). Finally, detailed hemodynamic data including relative blood volume monitoring, tissue oximetry, and other parameters will be collected continuously during IKRT sessions enabling exploratory analyses aimed at identifying hemodynamic phenotypes related to IDHE during IKRT.
Our study aims to investigate the value of postural perfusion index changes as a non-invasive method to predict hypotension following spinal anesthesia for elective cesarean delivery.
The prospective study is planned in a university hospital. Spinal anesthesia is widely used for cesarean section currently for its safety, low cost, reliability, easiness to administer, immediate effect, and well-operating conditions. However spinal anesthesia has some complications as hypotension, bradycardia and Post Dural Puncture Headache (PDPH). A practical strategy for avoiding hypotension during initiation of spinal anesthesia for cesarean delivery includes intravenous crystalloid, in conjunction with administration of vasopressors. PDPH is one of the most frequent complications of spinal anesthesia. Conservative therapies such as bed rest, hydration, and caffeine are commonly used as management. For this study, coffee group of patients will be given unsweetened brewed coffee 150 ml until 2-4 hours before surgery. Patients who accept to drink brewed coffee ( coffee group) and water( control group) will be included in the study. The patient's heart rate, blood pressure, oxygen saturation will be monitored and recorded during operation. Intraoperative will be recorded to amount of vasopressor and intraveous crystalloid. Whether the patient develops PDPH in the postoperative period will be followed for 3 days. In addition abdominal auscultation for bowel sounds hourly and the time of first bowel movements will be recorded. According to the patient's statement, the time of first flatulence and defecation will be followed and recorded.