Estimation of CPR Chest Compression Depth

Study Overview
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Brief Summary
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Optimal chest compression depth during CPR is 4.56cm which is at variance with the current guidelines of 5.0-6.0cm. A change in guidelines is only worthwhile if healthcare professionals can accurately judge a subtle reduction in chest compression depth during CPR by a relatively small amount.

Detailed Description
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Chest compression depth and rate during cardiopulmonary resuscitation (CPR) are important predictors of return of spontaneous circulation and survival following cardiac arrest. Stiell et al (2014) found optimal survival at a compression depth of 4.56cm, which is at variance with the current guidelines of 5.0-6.0cm. A change in guidelines is only likely to improve survival rates if healthcare professionals can accurately implement these subtle depth modifications into the basic life support (BLS) algorithm. This study aims to determine if healthcare professionals can accurately judge compression depth without real-time feedback.

Official Title
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Can Rescuers Accurately Deliver Subtle Changes to Chest Compression Depth if Recommended by Future Guidelines?

Conditions
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Cardiac Arrest

Intervention / Treatment
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* Behavioral: Compression depth


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: NHS professionals (staff or students), who have successfully completed a hospital-accredited basic life support (BLS) course, including a practical CPR component. Exclusion Criteria: Pregnancy, significant medical illness or injury that would impair delivery of chest compressions

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Sequential Assignment
Interventional Model Description: Prospective, randomised.
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Target compression depth 4.0-5.0 cm<br>The rescuer is asked to perform two minutes of chest compressions on a manikin, aiming to compress to the target depth at a rate of 100-120/min | Behavioral: Compression depth<br> <br> |
| Experimental: Target compression depth 4.5-5.5 cm<br>The rescuer is asked to perform two minutes of chest compressions on a manikin, aiming to compress to the target depth at a rate of 100-120/min | Behavioral: Compression depth<br> <br> |
| Experimental: Target compression depth 5.0-6.0 cm<br>The rescuer is asked to perform two minutes of chest compressions on a manikin, aiming to compress to the target depth at a rate of 100-120/min | Behavioral: Compression depth<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Compression to target window depth | Mean compression depth | Two minutes | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Compression to target rate | Mean compression rate | Two minutes | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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CPR, Basic life support