Clinical Research Directory

Positional Effects on Lung Ventilation and Perfusion in Obesity

Electrical Impedance Tomography (EIT) is a non-invasive, bedside monitoring tool that provides real-time information on regional ventilation and perfusion. In particular, EIT has the potential to guide individualized mechanical ventilation in obese patients by revealing how gravitational and positional factors alter regional lung behavior. Assessing the effects of different horizontal positions on both ventilation and perfusion may help optimize respiratory management strategies tailored to body habitus. By comparing obese and non-obese healthy participants across different positions, this study aims to provide novel insights into the postural effects on lung aeration and perfusion distribution, and to highlight the role of EIT in tailoring individualized ventilation strategies.

Anesthesia, Perfusion, and Surgical practicEs in Cardiac Surgery

Perioperative management in cardiac surgery, particularly the use of anesthesia, cardiopulmonary bypass (CPB), and surgical techniques, remains highly variable across institutions. Current international guidelines lack clear recommendations due to insufficient high-quality comparative data. APECx is an adaptive, international, multicenter, prospective, observational study designed to address multiple of these evidence gaps. The adaptive design allows the study to proceed through subsequent phases. Each phase will collect comprehensive global data on specific peri-operative practices and their associated patient outcomes, all within a single, continuously evolving study.

PPG vs. ICG in Gastrointestinal Resections

This randomized controlled trial compares a novel optical technique against the standard of care for assessing tissue perfusion in gastrointestinal surgery. Participants are randomized to receive either intraoperative imaging photoplethysmography (iPPG) or indocyanine green (ICG) fluorescence imaging. In the ICG group, the fluorescence data are comprehensively analyzed in two distinct ways: (1) Qualitative Assessment: real-time visual interpretation of the angiogram flow by the operating surgeon; and (2) Quantitative Assessment: software-based analysis of fluorescence kinetics (e.g., time-to-peak, maximum intensity) to generate objective perfusion parameters. The study aims to determine the agreement between the iPPG-based evaluations and both the qualitative and quantitative dimensions of the ICG standard.

Brain PERfusion Evaluation by Contrast-Enhanced UltraSound

The objective of the study is to assess brain tissue perfusion by contrast-enhanced ultrasound perfusion imaging (PerCEUS) in acute brain injuries. More precisely, it aims : * to evaluate the heterogeneity of brain perfusion and thus diagnose brain tissue hypoperfusion with contrast-enhanced ultrasound. * to correlate contrast-enhanced ultrasound with perfusion measurements by usual multimodal monitoring.

Foot Perfusion by Dynamic Contrast Enhanced MRI in Patients With Peripheral Artery Disease

We investigate the peri-operative foot perfusion through dynamic contrast enhanced MRI in patients with peripheral artery disease

Micro-dosing Indocyanine Green (ICG) in Children

The goal of this cohort study is to identify the lowest dose of Indocyanine Green (ICG) that achieves satisfactory intra-operative fluorescence for the assessment of gastrointestinal or genitourinary tract perfusion in children.