View clinical trials related to Hypotension.
Filter by:Patients referred to neurosurgery routinely and safely undergo deep brain stimulation (DBS) for treatment of symptoms related to neurodegenerative conditions, most commonly Parkinson's disease. In the investigators experience, and published evidence shows, that stimulation has effects on the autonomic nervous system. In patients undergoing therapeutic DBS for a particular subtype of Parkinsonism, Multiple System Atrophy, the further effects on autonomic parameters such as blood pressure and bladder symptoms as well as the originally intended indications (gait and movement disorder) will be investigated. The mechanisms of any effects will also be studied by using a number of techniques such as magnetoencephalography (MEG) and Muscle Sympathetic Nerve Activity (MSNA) recording. Key goals are to: 1. Demonstrate that stimulation of the peduculopontine nucleus (PPN) improves autonomic function and has an attendant improvement on patients' quality of life 2. Investigate the role of the PPN and how it interacts with other brain areas. This translational strategy will lead to a larger efficacy study of DBS for MSA as well as revolutionizing neural-based treatments in other autonomic disorders such as orthostatic hypotension and pure autonomic failure.
Protamine remains the anticoagulant of choice for cardiopulmonary bypass (CPB). The process of protamine neutralization of heparin came with the side effects sometimes; it can be life threatening or fetal reaction. The adverse cardiopulmonary response of protamine has been observed during entire history of clinical cardiac surgery. The true mechanism reaction is difficult to defined and the complexity of the clinical situation The classification of protamine reaction has been divided in to main 3 types (transient systemic hypotension secondary to rapid administration, anaphylactic and anaphylactoid reaction and catastrophic pulmonary vasoconstriction. The reaction from pharmacologic histamine release is the most common type of reaction. Protamine was believed to induce hypotension by this mechanism, and it was demonstrated to release histamine by degranulation of isolated mast cells From the hypothesis that the systemic hypotension cause by the released of histamine. The investigators will measure the serum tryptase which is the enzyme that released from degranulation of human mast cell. Comparing the serum tryptase level of the patient at baseline, 30 min and 60 min after protamine was given. There for the hypothesis of this study is administrating of H1 and H2 blocker helps attenuate the drop in MAP after protamine is given.
This study will be collecting data on participants undergoing lower body negative pressure (LBNP) to simulate progressive blood loss. The goal of the study is to collect data to allow for development of an algorithm with machine learning to predict blood pressure responses to hypovolemia by analyzing the arterial waveforms collected during LBNP.
A study to compare between intravenous atropine and glycopyrrolate in preventing spinal anesthesia induced hypotension in patients undergoing major lower limb orthopedic surgeries. Hypotension is the most common complication in spinal anesthesia that can be life threatening. If this can be prevented patients comfort can be increased and satisfaction as well.
- The primary endpoint is the effect of the addition of oral Diltiazem and Tranexamic Acid to general anesthesia aided reduction in blood loss during functional endoscopic sinus surgery (FESS). - The secondary endpoint is surgeon's assessment of the surgical field and hemodynamics.
This will be a Phase II single center, double-blind, randomized, placebo-controlled, efficacy study. Subjects will complete six visits. The first will be a screening visit. There will be four assessment visits: baseline, 2 weeks after the double-blinded trial begins, the end of the blinded trial, and after 4 weeks of washout. There will also be an additional randomization and medication dispensing visit immediately following the dose optimization period and preceding the double-blinded trial.
The new American Heart Association (AHA) blood pressure guidelines are expected to raise the prevalence of high blood pressure to ~46% in the United States. One recommendation for lowering blood pressure is aerobic exercise, which produces a period of lowered blood pressure (post-exercise hypotension; PEH) that lasts up to 24 hours. It is believed that PEH may be responsible for the observations of lowered blood pressure following initiation of exercise. However, most Americans eat too much salt, which expands plasma volume and may prevent PEH, rending aerobic exercise ineffective in improving blood pressure status.
This observational study is to evaluate Perfusion Index Change as a Predictor of Hypotension During Propofol Sedation in Adult Patients Undergoing Hip Surgery Under Spinal Anesthesia.
The investigators propose this study to test the hypotheses that inferior vena cava (IVC) diameter can predict hypotension after labor analgesia (epidural, combined spinal-epidural) and neuraxial anesthesia for cesarean section (epidural, combined spinal-epidural and spinal block) in full-term pregnant patients.
Patients with acute hip fractures are old and vulnerable. With a majoriry classified as being ASA 3 or more. Frequently they receive spinal anesthesia perioperatively inducing hypotension. Even a short hypotensive period may induce postop cardiac T roponinT leakage as well as renal failure noted by Changes in Serum Creatinin or Cýstatin C This will be investigated and correlated to intraoperative hypotension as step one. Preliminary this will be followed by an intervention with vasopressor treatment perioperatively to preserve an adequte MABP