Which of the following is the correct hand position for performing bag-mask ventilation using the E-C clamp technique?

## Bag-Mask Ventilation: E-C Clamp Technique **Key Point:** The E-C clamp (or EC clamp) is the gold standard hand position for single-operator bag-mask ventilation, providing optimal seal and airway patency. ### Anatomical Basis of E-C Clamp The technique derives its name from the hand configuration: - **C component:** Thumb and index finger form a C-shape around the mask, creating a circumferential seal - **E component:** The remaining three fingers (middle, ring, and little finger) form an E-shape on the mandible, lifting it anteriorly ### Mechanism of Action 1. The C-shaped grip with thumb and index finger applies gentle, even pressure on the mask edges 2. The E-shaped finger placement on the mandible (along the angle and body) lifts the jaw forward 3. This combination simultaneously: - Maintains mask seal - Relieves airway obstruction by anterior mandibular displacement - Prevents gastric insufflation through proper jaw positioning ### Clinical Application **High-Yield:** The E-C clamp is superior to other single-handed techniques because it allows the anesthesiologist's other hand to operate the bag, making it the preferred method in emergency and routine anesthesia practice. **Clinical Pearl:** Proper finger placement on the mandible should be at the angle of the mandible and along its body—NOT on soft tissues of the neck, which risks vascular compression and airway obstruction. ### Common Pitfalls - Placing fingers on the soft tissues of the neck instead of the bony mandible - Using excessive pressure on the mask, which can cause facial nerve compression and discomfort - Inadequate jaw thrust, leading to tongue falling back and airway obstruction **Tip:** Practice the E-C clamp on a manikin before clinical use. The three E-fingers should be positioned to lift the mandible upward and forward, not downward.