Restoration of Consciousness With Ultrasonic Deep Brain Stimulation During Anesthetic Sedation

University of Michigan168 enrolled

Overview

The purpose of this study is to see if mental functions take place during different levels of anesthesia using two commonly used drug (propofol and dexmedetomidine) and will include low-intensity focused ultrasound pulsation (LIFUP) to stimulate specific areas of the brain while undergoing functional Magnetic Resonance Imaging (fMRI or "brain imaging"), which shows areas in the brain involved in thinking at different depths of anesthesia. That is, ultrasound is being used to stimulate the brain and multiple pictures will be taken of the brain. As a result of this study, we expect to gain a deeper understanding of mental function during different levels of anesthesia, and to evaluate if the use of ultrasonic brain stimulation accelerates return to consciousness.

The FDA determined this trial is a non-significant risk (NSR) device study. Although Propofol and Dexmedetomidine, which are FDA-approved drugs for use in patients undergoing an anesthetic for medical treatment, will be used in this trial, the FDA determined that the trial will not be studying these drugs. Rather, the FDA determined this trial will be studying the NSR device. To ensure consistency with the FDA's determination, the field for "U.S. FDA-regulated Drug" in this record has been marked as "No."

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

BASIC_SCIENCE

Masking

NONE

Enrollment

168

Conditions

Mental Function

Interventions

Propofol for fMRIPROCEDURE

Propofol infusion

Dexmedetomidine for fMRIPROCEDURE

Dexmedetomidine infusion

Dorsolateral prefrontal cortex (DLPFC) pulsationDEVICE

BXPulsar 1002 low-intensity focused ultrasound pulsation (LIFUP) on the DFPFC

Anterior insular cortex (AIC) pulsationDEVICE

BXPulsar 1002 LIFUP to AIC

Central thalamus (CT) pulsationDEVICE

BXPulsar 1002 LIFUP to CT

Eligibility

Sex: ALLMin age: 18 YearsMax age: 40 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Healthy study participants with American Society of Anesthesiologists (ASA) Physical Status Classification System-1 status * The participants will be right-handed adults * Body mass index (BMI) less than 30. * All subjects will be English speakers. Exclusion Criteria: * Medical contraindication to MRI scanning; are unable to undergo MRI scanning because of possible pregnancy or currently breastfeeding, * BMI\>30, * metallic substances in the body, claustrophobia, anxiety, or cardiopulmonary disease; or have an intracranial structural abnormality on T1-weighted MRI scans. * History of allergy to propofol, dexmedetomidine, any components of propofol or dexmedetomidine, eggs or egg products, soybean or soybean products, * Neurological, cardiovascular, or pulmonary illness; * Significant head injury with loss of consciousness; * Learning disability or other developmental disorder; sleep apnea or any severe snoring history; gastroesophageal reflux disease (GERD) or heartburn; pancreatitis or a history of pancreatitis, or sensory/motor loss sufficient to interfere with performance of the study; epilepsy/seizure disorder (including a history of seizures) or stroke (including a history of stroke). * Participants with tattoos in the head or neck region will be excluded from study; other tattoos are subject to determination by investigators based on their assessment regarding participant safety. * Recent food or liquid intake (within 8 hours). * History of drug use, have a positive drug screen, are unwilling to abstain from alcohol for 24 hours prior to dosing, or have a current history of nicotine use. -----Negative pregnancy test result, if applicable. * Potential participants who have participated in a clinical trial using an investigational drug or device within 30 days will be considered for enrollment after 30 days.

Outcomes

Primary Outcomes

Functional connectivity (e.g., Pearson correlation coefficient) of Blood Oxygen Level Dependent (BOLD) time courses

Time frame: Up to 90 minutes

Secondary Outcomes

Grip force (in mmHg) of participants' hand squeezing on a rubber ball in response to instructions