View clinical trials related to Intravascular Volume.
Filter by:The study will be conducted to asses preoperative condition of venous system by VExUS score and it's relation with the incidence of spinal induced hypotension in geriatric patients undergoing surgery with spinal anaesthesia.
Ultrasound measurements of the inferior vena cava (IVC) have been proposed as a noninvasive tool to help guide fluid management. Well-established correlations exist between respiratory cycle-induced changes in IVC diameter and C entral Venous Pressure (CVP) . Beyond providing an estimate of CVP, the caval index, or percentage collapsibility of the IVC , has been proposed as a predictor of preload reserve. This noninvasive rapid measurement of CVP is especially important in critical care settings. It can help in differentiating hypovolemic, septic and cardiogenic shock. Changes in volume status will be depicted by change in the diameter of the IVC . However, the validity and reliability of sonographic assessment of the inferior vena cava have been matters of controversy, and its applicability has been shown to be limited by technical difficulties. Recent study has shown a significant relationship between the internal jugular vein/common carotid artery (IJV/CCA) cross-sectional area ratio and CVP in pediatric burn patients .
Assessment of intravascular volume status is crucial in order to predict the efficacy of volume status in major abdominal surgery. The aim of the study is to verify the feasibility and usefulness of the internal jugular vein distensibility index as an adjunct to the pleth variebility index(PVI) to predict fluid responsiveness in major abdominal surgery.
The minimum period of fasting recommended by the 'American Society of Anesthesiologists' for the preoperative period is 6 hours for solid foods and 2 hours for clear liquids. Knowing the effect of preoperative fasting time on intravascular volume status may lead us to determine the amount of fluid to be administered intraoperatively. Cardiac preload static indicators are often insufficient to predict the need for fluid and are often measured by invasive methods. Knowing the adequacy of the preload is important in anesthesia practice; there is no hemodynamic benefit of fluid replacement in non-responsive patients. In this study, the investigators aimed to determine the effect of preoperative fasting period on cardiac index change after anesthesia induction in pediatric patients aged 5-12 years. The primary implication of this study is to determine the fasting period of fluid evacuation by assessing patients' intravascular volume status.
Fluid therapy optimization in the perioperative period has been considered as major contributor to improve oxygen delivery. A recent, noninvasive approach to estimate fluid requirements in the anesthetized patient with arterial line is the assessment of difference in pulse pressure (dPP). Intraoperative fluid management by dPP is a goal-directed fluid management approach to avoid both hypervolemia and hypovolemia. However, several clinical factors may impede dPP measurements. Surgical manipulations in abdominal procedures may interfere with hemodynamic stability due to obstruction of the caval vein. Physiological considerations make us hypothesize that only intense pressure impedes caval blood flow and thus hemodynamics and dPP. Therefore, the investigators want to assess those changes after standardized application of three different pressure levels (2 N, 5 N, 10 N) on the caval vein.