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
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
Optimizing Manual Ventilation in Prehospital Care: Ambu® SPUR® II FAQ
Not all adult bag- valve- masks are created equally. Small bags, often used on adult patients, can lead to under-ventilation — a risk highlighted in independent clinical evidence. The Ambu® SPUR® II is sized specifically for adult patients to deliver guideline-aligned tidal volumes consistently in prehospital care.
This FAQ explains how the SPUR II supports evidence-aligned ventilation, objective monitoring, provider control, and operational efficiency to help physicians optimize airway management protocols and patient outcomes.
Q1: Why should I consider switching to the Ambu SPUR II if I already have a
bag-valve-mask?
A: The SPUR II is designed for adult patients and delivers the right amount of air every time. Studies show that smaller or older bag-valve- masks can under-ventilate adults, which can put patients at risk. SPUR II gives reliable performance, clear feedback, and easy handling. When used with EOlife®, it also provides data to help providers check their technique and improve patient care.
Q2: How does the Ambu® SPUR® II ensure reliable, high-quality positive pressure ventilation (PPV)?
A: The SPUR II is engineered for procedural consistency. Its unique single-shutter valve system delivers low-resistance airflow, while the thin-walled compression bag allows clinicians to accurately gauge a patient’s lung compliance in real-time. This combination helps maintain effective ventilation and quickly identify changes in the airway or breathing.
Q3: How does the Ambu SPUR II improve control and ventilation performance during high-stress prehospital scenarios?
A: The SPUR II provides tactile and visual feedback, recreating the trusted “Ambu feel” in a disposable bag-valve- mask. Its improved recoil time, thin-walled compression bag, and unique single-shutter valve system enable precise control and reliable stroke volume delivery. The SafeGrip™ surface and integrated handle allow one-handed operation for consistent ventilation under pressure.
Q4: How does the Ambu SPUR II enhance ventilation training when paired with EOlife X?
A: The SPUR II delivers AHA guideline–compliant tidal volumes with a lightweight, ergonomic design that reduces fatigue. When paired with EOlife® X, it provides real-time feedback on ventilation performance, including tidal volume and rate. Together, they create a data-driven training solution that helps clinicians refine techniques and improve manual ventilation skills.
Q5: Why should EMS physicians use the Ambu SPUR II as their standard manual
bag-valve-mask?
A: The SPUR II is designed to deliver guideline-aligned tidal volume while reducing provider fatigue. Its fast recoil time and ergonomic design make ventilation reliable even in high-acuity prehospital settings. Using SPUR II consistently helps ensure adult patients receive effective, safe ventilation every time.
