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. 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 i...
Every minute counts during a cardiac arrest. Yet many bystanders freeze because they never learned what to do. An AHA CPR certification fixes that problem. It gives you the skills and the confidence to act fast. This guide walks you through each step, from choosing a class to claiming your eCard. Why an AHA CPR Certification Matters Cardiac arrest is common, and survival is low. The 2025 CARES Annual Report tracked more than 140,000 out-of-hospital cardiac arrests across the United States. Only 10.5% of those patients survived to hospital discharge. However, bystander CPR changes the odds. Patients who received CPR from a bystander survived at a rate of 12.8%. Patients who did not receive it survived at 7.7%. That gap shows why CPR training saves lives. Home is where most emergencies happen. The American Red Cross reports that just over 70% of out-of-hospital cardiac arrests strike at home. So the person you save is often someone you love. Bystander CPR reached 42.5% in 2025, the...