Every bag-valve-mask ventilation depends on one thing: a good mask seal. Without it, air leaks out, and the patient gets less oxygen than you intended. Rescuers can build that seal in two main ways. One rescuer can use the E-C clamp, or two rescuers can split the work. This guide explains both techniques, compares them, and shows when a second rescuer makes the biggest difference.
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Why the Mask Seal Matters
The bag-valve-mask, or BVM, delivers positive pressure ventilation. That pressure only helps if it stays inside the airway. A poor seal lets air escape around the mask. A poor seal is also one of the most common BVM mistakes, so technique choice matters. For a complete introduction to the device, see our guide to bag-valve-mask ventilation.
The One-Person E-C Clamp Technique
Sometimes you are the only rescuer. In that case, use the E-C clamp. Follow these steps:
Position yourself at the top of the patient's head, and open the airway using the sniffing position. Use a jaw thrust instead if spinal injury is possible.
Place the mask over the nose and mouth, with the narrow end on the bridge of the nose and the wide end between the lower lip and chin.
Form a "C" with your thumb and index finger on top of the mask, pressing it onto the face.
Form an "E" with your remaining three fingers along the bony part of the jaw. Lift the jaw up toward the mask. Avoid pressing on the soft tissue under the chin.
Squeeze the bag with your other hand for about one second, until the chest rises.
Strengths: It needs only one rescuer, and it works when help has not arrived.
Limits: One hand must hold the seal and lift the jaw, so leaks are more likely. Small hands, large faces, and beards make it harder.
The Two-Person Technique
The two-person technique splits the work. It uses two rescuers with two clear roles:
Rescuer one stays at the head. They open the airway and hold the mask with both hands. Their thumbs press down on the mask, and their fingers lift the jaw.
Rescuer two squeezes the bag, using one or both hands, and delivers each breath over about one second.
Both rescuers watch the chest for visible rise.
Strengths: Two hands on the mask create a stronger seal. The rescuer at the head can focus entirely on the airway. The rescuer at the bag can focus on volume and rate.
Limits: It needs a second trained person, so it may not be possible in every situation.
Side-by-Side Comparison
Seal quality: One-person: more likely to leak. Two-person: stronger and more consistent.
Hands on the mask: One-person: one hand. Two-person: both hands.
Who squeezes the bag: One-person: the same rescuer. Two-person: a second rescuer.
Rescuer fatigue: One-person: higher. Two-person: lower.
Staffing: One-person: one rescuer. Two-person: two rescuers.
Why Teams Prefer Two Rescuers
Current AHA resuscitation guidance favors a two-person technique when enough rescuers are available. The reason is practical. A better seal means more of each breath reaches the lungs. Splitting the tasks also reduces errors, such as squeezing too hard, ventilating too fast, or missing a leak. Those are the same mistakes we cover in our guide to common BVM errors.
When a Second Rescuer Matters Most
Ask for help early in these situations:
Facial trauma: Injury can make it hard to fit the mask against the face.
Beards and unusual anatomy: Hair and facial shape can break the seal.
Prolonged resuscitation: Squeezing a bag and holding a mask both tire the hands quickly.
Difficult airways: Two hands give better control of the jaw and airway.
What Both Techniques Share
Whichever technique you use, the goals stay the same:
Choose the correct mask size.
Connect oxygen at 10 to 15 L/min.
Position the head to open the airway.
Watch for visible chest rise with every breath.
Avoid over-ventilation, which can cause gastric insufflation, vomiting, and aspiration.
Deliver about one breath every six seconds for adults, and about one breath every two to three seconds for children and infants.
FAQ
When should two rescuers be used for BVM ventilation?
Use two rescuers whenever staffing allows. It matters most with facial trauma, beards, difficult anatomy, and long resuscitation efforts.
How do you achieve an effective seal with a bag-valve-mask?
Use the correct mask size and position the head to open the airway. Then use either the one-person E-C clamp or the two-handed technique. Confirm the seal by watching for chest rise.
Is the E-C clamp technique still useful?
Yes. It is the core one-rescuer technique, and every provider should be able to perform it. It just works best when a second rescuer is not yet available.
Practice Both Techniques Hands-On
Reading about the seal is not the same as building one. In our BLS for Healthcare Providers course, you practice both the E-C clamp and the two-person technique on manikins, with instructor feedback. Sign up for BLS classes in Cincinnati and gain the confidence to respond effectively.
Looking for broader training? Explore our CPR certification in Cincinnati courses. All classes are American Heart Association-authorized and taught in a stress-free, hands-on format.
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