How Small Is Too Small?
Adult Manual Ventilation – Done Right
Small adult resuscitators (Bag-Valve-Masks) are being used on adult patients, despite independent clinical evidence showing they can under-ventilate in pre-hospital conditions. The Ambu® SPUR II® is ideally sized to deliver effective adult ventilation while staying within AHA guidelines
Want to see the proof? Download our clinical evidence summary with independent studies showing why SPUR II outperforms undersized bags.
1. Snyder, Brian D., Michael R. Van Dyke, Ryan G. Walker, Andrew J. Latimer, Benjamin C. Grabman, Christopher Maynard, Thomas D. Rea, Nicholas J. Johnson, Michael R. Sayre, and Christopher R. Counts. “Association of Small Adult Ventilation Bags with Return of Spontaneous Circulation in Out-of-Hospital Cardiac Arrest.” Resuscitation 193 (December 2023): 109991. https://doi.org/10.1016/j.resuscitation.2023.109991
Experience Adult Ventilation — Without Guesswork
Try it yourself in a hands-on demo. SPUR II and EOlife X help EMS leaders, educators, and clinicians validate their practice, confirm results, and improve outcomes.
SPUR II is Ideally Sized for Adult Patients
It’s built to deliver reliable results in the field:
- Gives consistent, guideline-aligned adult tidal volume
- Designed to sit at the upper limit of American Heart Association (AHA) guidelines
- Helps offset real-world losses from mask leaks and dead space
The result: Adult ventilation that stays compliant without crossing the line into “too small.”
The Risk of Small Adult Bag-Valve-Masks
Small bags, big risk: Bag-Valve-Masks recommended up to 85 pounds are often used on adults, but evidence indicates they may be associated with under-ventilation in adult patients.
According to the AHA recommendations, chest rise cannot be assessed during continuous chest compressions, making delivered tidal volume critical, and because mask leakage often reduces effective ventilation, pediatric-sized bags may further limit adequate volume, whereas adult-sized bags have been associated with higher rates of return of spontaneous circulation (ROSC) in adult cardiac arrest.
In the field, the primary challenge during bag-valve-mask ventilation is air leakage, which leads to hypoventilation, according to a study published in the European Resuscitation Council.
Smaller bags amplify this problem, making it difficult — or impossible —to compensate for
- Mask leakage
- Airway and device dead space
- Challenging environmental conditions
EOlife X: Measure What Actually Reaches the Lungs
EOlife X is a training device that objectively measures manual ventilation performance.
It provides real-time feedback by:
- Measuring delivered tidal volume
- Quantifying mask leakage
- Identifying under-ventilations associated with undersized Bag Valve Masks
- Reinforcing proper use of appropriately sized adult bags like SPUR II
