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Microcirculation clinical trials

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NCT ID: NCT06368635 Recruiting - Clinical trials for Coronary Artery Disease

The Cerebral Microcirculation Diseases and Coronary Microcirculation Disease Study

CCMD
Start date: January 1, 2024
Phase:
Study type: Observational

Ischaemic heart disease (IHD) and degenerative brain disease are two major sources of death and disability affecting all countries. While the consequences of obstructive disease in major vessels supplying blood to both organs have been widely documented, less attention has been paid to disease processes affecting the microcirculation that may affect cardiac and cerebral function. Yet, over the last decade significant progress has been made in understanding the substrate of microvascular disease in both organs. In the heart, arteriolar thickening and capillary rarefaction that reduce the conductance of the microvasculature and its ability to vasodilate in response to increased myocardial oxygen demands constitute the leading cause of coronary microvascular dysfunction (CMD). In the brain, concentric hyaline thickening of deep penetrating small arteries (arteriolosclerosis) with associated fibrosis of the vessel wall constitutes the most frequent substrate for cerebral small vessel disease (CSVD). Of note, both CMD and CSVD share common risk factors, such as age, hypertension, and diabetes.3 These factors might have a common effect on the microvascular domain of cardiac and cerebral vascular beds. Although a potential link between both conditions has been hypothesized based on the similarities between pathological changes and risk factors, advance in knowledge exploring this has been hampered by lacking objective evidence of CMD and pathological brain changes indicative of CSVD in prior research studies. Thus, the relationship between CMD and CSVD is unknown. The main objective of this study was to analyse the relationship between cerebrovascular disease and CMD in patients with atherosclerotic coronary artery disease (CAD).

NCT ID: NCT06191913 Completed - Microcirculation Clinical Trials

Microcirculatory Alteration by a Vascular Occlusion Test Using Near-infrared Spectroscopy in Pediatric Cardiac Surgery

Start date: January 18, 2021
Phase:
Study type: Observational [Patient Registry]

Cardiopulmonary bypass cause microcirculatory alterations. Near infrared spectroscopic measurement of tissue oxygen saturation and vascular occlusion test are novel technologies for assessing the microcirculatory function of peripheral tissue specifically in patients undergoing cardiac surgery with cardiopulmonary bypass

NCT ID: NCT06141681 Recruiting - Microcirculation Clinical Trials

Evaluation of Microcirculation With Photoplethysmography (Pulse Oximetry) in Healthy Volunteers and Ventilated Patients

Start date: June 19, 2023
Phase:
Study type: Observational

The objective of this observational study is to explore microcirculation in healthy volunteers and in ventilated patients in the operating room and in critical care. The general objective of this study is to evaluate microcirculation with photoplethysmography (PPG) in different pathophysiological situations and to compare PPG with available standard methods. Specifically, evaluate the correlation between the determinations of AC-DC waves obtained by Photoplethysmography (PPG) and those obtained in different dynamic tests in healthy volunteers. To compare microcirculation assessments [capillary refill time (CRT), perfusion index (PI), perfusion index variability (PIV)] with measurements obtained by PPG in the context of critically ill patients. To compare microcirculation assessments (CRT, PI PVI) with measurements obtained by PPG in the context of patients on invasive mechanical ventilation (IMV) in the operating room and in critical care.

NCT ID: NCT05990907 Active, not recruiting - Hemodynamics Clinical Trials

Influence of RIC on the Orthostatic Competence of the Microcirculation

Start date: July 30, 2023
Phase: N/A
Study type: Interventional

The goal of this clinical trial (pilot study) is to learn about the microcirculatory regulation of the lower extremity under orthostatic stress with and without RIC - Remote Ischemic Preconditioning in healthy participants. The main question it aims to answer are: Do the beneficial effects of RIC withstand orthostatic stress? / Does RIC benefit lower extremity microcirculation in ortho-statically stressed subjects? Is there a relationship/correlation between the variables of microcirculation and hemodynamics in the context of RIC and orthostatic loading?

NCT ID: NCT05829785 Completed - Obesity Clinical Trials

Influence of Obesity on Microvascular Reactivity During General Anesthesia

Start date: June 1, 2018
Phase:
Study type: Observational

The purpose of this study was to investigate the effect of obesity on changes in microvascular reactivity and tissue oxygen saturation (StO2) during general anesthesia using near-infrared spectroscopy in conjunction with vascular occlusion tests (VOT). For this prospective observation investigation, a total of 128 patients who underwent elective surgery under general anesthesia at Pusan National University Hospital between June 2018 and February 2021 were participated in this study. Baseline StO2 on thenar eminence, hemodynamics, and laboratory profile were monitored before (Tpre) and 30 min after general anesthesia (Tpost). During vascular occlusion tests (VOT), the occlusion slope representing oxygen consumption of muscle and recovery slope representing microvascular reactivity were also collected at Tpre and Tpost. For analysis, the patients were divided into two groups: overweight (body mass index [BMI] ≥ 25 kg/m2) and normal weight (BMI < 25).

NCT ID: NCT05681052 Recruiting - Septic Shock Clinical Trials

Mottling Score and Central Venous Oxygen Saturation in Septic Shock Patients

Start date: October 1, 2022
Phase:
Study type: Observational

Mottling score and central venous oxygen saturation are described as a clinical evaluation of tissue perfusion. This study describes mottling incidence and mottling score in septic shock patients according to central venous oxygen saturation.

NCT ID: NCT05606536 Recruiting - Microcirculation Clinical Trials

The Impact of Intra-operative Fluid Infusion Rate on Microcirculation

Start date: October 1, 2022
Phase: N/A
Study type: Interventional

Intraoperative fluid therapy (IFT) is an integral part of anesthesia care during surgery. Its main indication is the optimization of oxygen supply to the tissues. For elective surgery that is not associated with higher blood loss and a long period of preoperative fasting, including fluids IFT is dosed to cover the basal daily need for fluids. However, it is not clear whether this fluid dose is optimal. Surgery is a stress factor that leads, among other things, to damage of the endothelial glycocalyx (EG). EG binds a significant amount of plasma, which is released during EG destruction and causes relative hemodilution. Isovolumic hemodilution is an established intraoperative procedure that serves to better control bleeding in procedures where bleeding is expected. However, partial hemodilution occurs even with standard IFT, and even when fluids are hardly given at all. Flow parameters in microcirculation have not yet been described depending on IFT conduction. The parameters of the microcirculation reflect its functioning, which will consequently affect the postoperative phase of the patient's moaning and clinical outcome.

NCT ID: NCT05234645 Completed - Clinical trials for Endothelial Dysfunction

Short Term Effects of Probiotics in the Human Micro-vascular Physiology

PIMCO-KEFIR
Start date: April 1, 2019
Phase: N/A
Study type: Interventional

While the beneficial properties of kefir consumption have been thoroughly studied for many years, very little research has been conducted to explore the potential protective properties of kefir consumption to the endothelium in humans. Therefore, the aim of the current study is to explore the short-term efficacy of kefir consumption in improving endothelial function in older and younger healthy, sedentary adults.

NCT ID: NCT04982016 Not yet recruiting - Microcirculation Clinical Trials

Effects of Fluid Therapy on Microcirculatory Reactivity

Start date: September 2021
Phase: N/A
Study type: Interventional

Through preoperative fluid therapy, to investigate whether it can alleviate the microcirculation dysfunction after induction of anesthesia, and reduce the incidence of perioperative fluid therapy-related complications, thereby accelerating rehabilitation.

NCT ID: NCT04962048 Terminated - Diabetes Clinical Trials

The Influence of Pulse-synchronized Negative Pressure on the Dermal Microcirculation

PSyNeP
Start date: May 28, 2021
Phase: N/A
Study type: Interventional

The technology of the pulse-synchronous alternating pressure system has been patented and is ready for application. Since the device is a combination of commercially available products with a software controlling the duration/initiation of the negative pressure, no harm for the study participant is expected. With no adequate preclinical model of impaired microcirculation being available, and due to the non-invasive nature of the device, the rationale to test the product in a controlled setting in clinical patients is justified. The intervention takes place twice a day for two consecutive days with objective assessment of the microcirculation before and after the intervention. Thereby, the immediate effect of the intervention is to be evaluated. A fifth assessment takes place on the third day without prior intervention to assess a possible long-term effect (comparison against first measurement - base line). The primary aim of this project is to investigate the tolerability and the comfort of pulse-synchronized negative pressure (PSNP) applied by the device manufactured by Orputec GmbH on the dermal microcirculation. Evaluation of patient comfort and tolerability will be performed by a Numerical Rating Scale (NRS). The application of the device (PSNP) significantly influences the dermal microcirculation (measuring by LD, HS, TH). The aims of this project is to investigate the tolerability / comfort and the effect of pulse-synchronized negative pressure (PSNP) applied by the device manufactured by Orputec GmbH on the dermal microcirculation. Objective evaluation of microcirculation with laser doppler (LD), hyperspectral imaging (HS), thermal imaging (TH).