Doppler Ultrasound Pulse Detection in Out-of-Hospital Cardiac Arrest Patients: A Feasibility Study.
Overview
- Phase
- N/A
- Intervention
- Not specified
- Conditions
- Cardiac Arrest, Out-Of-Hospital
- Sponsor
- Medical University of Vienna
- Enrollment
- 75
- Locations
- 1
- Primary Endpoint
- Feasibility of femoral artery doppler ultrasound
- Status
- Completed
- Last Updated
- last year
Overview
Brief Summary
The goal of this prospective observational study is to investigate the feasibility of using doppler point-of-care ultrasound on the femoral artery with a portable device to assess the presence of a pulse in patients suffering from cardiac arrest in the out-of-hospital environment. The main question is how often researchers are successful in acquiring the necessary ultrasound signal in the out-of-hospital environment.
Detailed Description
In this prospective observational study, a dedicated research team will be dispatched to cardiac arrest patients treated in the prehospital environment by emergency medical services (EMS). The team will use a portable ultrasound device to identify the femoral artery and conduct a pulsed wave (PW) doppler measurement during chest compressions as well as during chest compression pauses for rhythm analysis and save the recorded images. These ultrasound pulse checks will be conducted in parallel with the normal treatment of the patient, including manual pulse checks, and will only be conducted if ultrasound is possible without interference in the resuscitation. All treatment decisions will rest with the treating EMS team.
Investigators
Philipp Metelka
Dr., Resident
Medical University of Vienna
Eligibility Criteria
Inclusion Criteria
- •Out-of-hospital cardiac arrest treated by EMS
- •Minimum age of 18 years
Exclusion Criteria
- •Pregnancy or suspected pregnancy
- •Disapproval of the treating EMS team
- •Adults under legal guardianship
- •Inability to perform femoral artery doppler ultrasound due to limited access to the patient and possible interference with the treating EMS team
- •Inability to perform femoral artery doppler ultrasound due to injuries or anatomic abnormalities in the femoral region or necessary emergent medical interventions in the femoral region
- •Decision to transfer the patient to the hospital with ongoing CPR for emergent procedures such as extracorporeal CPR before femoral artery doppler ultrasound could be attempted
- •Inability to safely perform femoral artery doppler ultrasound due to environmental hazards
Outcomes
Primary Outcomes
Feasibility of femoral artery doppler ultrasound
Time Frame: During cardiac arrest, up to 45 minutes
If an ultrasound image of the femoral artery of sufficient quality for Doppler ultrasound can be obtained, the primary outcome will be considered to be positive.
Secondary Outcomes
- Patient factors influencing probability of successful doppler ultrasound image acquisition(After cardiac arrest, through study completion (a maximum of 1 year))
- Time until ultrasound signal acquisition(During cardiac arrest, up to 45 minutes)
- Inter-observer variability in determining the quality of the doppler ultrasound signal.(After cardiac arrest, through study completion (a maximum of 1 year))
- Correlation of the result of manual pulse checks with doppler peak systolic velocity(During cardiac arrest, up to 45 minutes)
- Discordance between doppler ultrasound and manual pulse checks.(During cardiac arrest, up to 45 minutes)