Clinical Research Directory

Blood Viscosity and Outcomes After Elective Craniotomy

This prospective observational study aims to evaluate the association between intraoperative blood viscosity and postoperative clinical outcomes in adult patients undergoing elective intracranial craniotomy. Blood viscosity is an important determinant of microcirculatory flow and cerebral perfusion, but its role in perioperative outcomes remains unclear. In this study, intraoperative blood viscosity and related hematologic parameters will be measured, and their relationships with cerebral oxygenation and postoperative complications will be analyzed. The study will enroll adult patients undergoing elective intracranial surgery at a single tertiary center. The findings of this study may improve understanding of perioperative hemodynamic and hemorheological factors and help identify potential risk markers for adverse postoperative outcomes.

Brain Regions and Functional Neuronal Network Characteristics of Dexmedetomidine Analgesia

Background: Dexmedetomidine (Dex) is a highly selective 2-adrenergic receptor agonist with significant analgesia affection. This study is planned to explore the brain regions and functional neuronal network involved in promoting analgesia of Dexmedetomidine. Methods: Select 28 patients with the proposed intraoperative MR-guided radiofrequency ablation of epilepsy. The subjects were randomized into the Dexmedetomidine group (Dex group) (n=14) and the Placebo group (PO group) (n=14). DEX group: continuous intravenously administered 1.5 µg kg-1 h-1 dexmedetomidine 15min before anesthesia induction, continuous infusion for 15min after anesthesia induction, and then Intraoperative functional magnetic resonance imaging scanning was started. PO group: the equivalent administered speed 0.9% sodium chloride was continuously pumped for 15min before anesthesia induction, then induce and intraoperative fMRI scanning started after continuous 30min infusion. The intraoperative fMIR scan results were compared and analyzed to find the unique analgesic brain regions of DEX, and the differences of the functional neuronal network of analgesia effect between the two groups.On January 8, 2024, the protocol was amended and approved by the Institutional Review Board (IRB) of China International Neuroscience Institution (Approval No. CINI-AD-20220706). In this approved amendment, to ensure a direct assessment of the most clinically meaningful patient-centered benefit, the primary outcome was redefined as postoperative pain measured by the Numerical Rating Scale (NRS) at 4, 24, and 48 hours. The pre-specified imaging measures BOLD were re-designated as secondary outcomes to explore the neural correlates of the analgesic effect. This protocol amendment was finalized prior to the enrollment of the first participant on January 15, 2024.