When using a bag-valve-mask (BVM) during CPR, which action is essential?

When using a bag-valve-mask (BVM) during CPR, using the E-C hand position to hold the mask in place is crucial. This technique involves forming a letter "E" with your thumb and fingers while using your thumb to create a seal on the bottom of the mask and your fingers to maintain a firm grip on the top. This hand position helps ensure a proper seal over the patient's mouth and nose, which is essential for delivering effective positive pressure ventilations.

If the mask is not sealed properly, the air being forced into the lungs can escape, preventing adequate ventilation and ultimately diminishing the effectiveness of the CPR efforts. Therefore, maintaining a good seal is paramount to ensure that oxygen is being delivered directly into the patient’s airway.

Other actions like delivering ventilations as a one-person technique, only sealing the mask when delivering breaths, or skipping the check for chest rise are not optimal practices. Each of these actions can lead to ineffective ventilation and compromise the patient's outcome. Proper technique and adherence to guidelines ensure that the BVM can be used effectively and efficiently during CPR.