Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
| Name | Class |
|---|---|
| Ludwig Boltzmann Institute Digital Health and Patient Safety | OTHER |
| Emergency Medical Service of Vienna | UNKNOWN |
Not provided
Not provided
Not provided
Not provided
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.
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.
Not provided
Not provided
Not provided
Not provided
Not provided
| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Included patients |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Point-of-care vascular ultrasound | Other | Point-of-care ultrasound will be used to image the femoral vessels and to perform a pulsed-wave doppler measurement of blood flow during chest compressions and during pauses for rhythm and manual pulse checks. |
| Measure | Description | Time Frame |
|---|---|---|
| Feasibility of femoral artery doppler ultrasound | 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. | During cardiac arrest, up to 45 minutes |
| Measure | Description | Time Frame |
|---|---|---|
| Time until ultrasound signal acquisition | The time until successful acquisition of the doppler ultrasound signal will be measured in 2-minute CPR-intervals and 30-second intervals (e.g. second CPR-interval, first 30 seconds). | During cardiac arrest, up to 45 minutes |
| Discordance between doppler ultrasound and manual pulse checks. |
Not provided
Inclusion Criteria:
Exclusion Criteria:
Not provided
Not provided
Not provided
Not provided
The study population comprises non-pregnant adults suffering out-of-hospital cardiac arrest of any cause who are treated with CPR by emergency medical services.
Not provided
| Name | Affiliation | Role |
|---|---|---|
| Philipp Metelka, MD | Medical University of Vienna | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Emergency Medical Service of Vienna | Vienna | 1030 | Austria |
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
| ID | Term |
|---|---|
| D058687 | Out-of-Hospital Cardiac Arrest |
| D006323 | Heart Arrest |
| ID | Term |
|---|---|
| D006331 | Heart Diseases |
| D002318 | Cardiovascular Diseases |
Not provided
Not provided
Not provided
Not provided
Not provided
The presence of a doppler ultrasound flow signal during rhythm analysis and the result of the manual pulse check that is performed in parallel by the treating EMS team will be evaluated and analyzed for discordance. |
| During cardiac arrest, up to 45 minutes |
| Correlation of the result of manual pulse checks with doppler peak systolic velocity | The correlation of the result of manual pulse checks performed by the treating EMS team with the peak systolic velocity measured by doppler ultrasound will be analyzed. | During cardiac arrest, up to 45 minutes |
| Patient factors influencing probability of successful doppler ultrasound image acquisition | Patient factors sex, age, approximated bodyweight and suspected cause of cardiac arrest will be analyzed for correlation with successful doppler ultrasound image acquisition. | After cardiac arrest, through study completion (a maximum of 1 year) |
| Inter-observer variability in determining the quality of the doppler ultrasound signal. | The sonographer on site will assess the quality of the acquired doppler ultrasound images, as well as two ultrasound experts who will be blinded to the performing sonographer. The difference between these assessments will be analyzed. | After cardiac arrest, through study completion (a maximum of 1 year) |