In BLS, how is ventilation provided for an unresponsive infant?

Ventilation for an unresponsive infant is provided using both mouth-to-nose and mouth-to-mouth techniques because these methods are effective in ensuring adequate airflow to the infant's lungs. Infants have smaller airways and require gentle ventilation, making it necessary to create a seal that can be accomplished by using both techniques simultaneously.

Using mouth-to-nose allows for effective ventilation when the infant's mouth may not easily accommodate a seal. Mouth-to-mouth is also applicable but can be limited by an infant's size. This combination ensures that rescuers can provide sufficient breaths while minimizing the risk of airway obstruction or injury to the delicate structures in an infant's airway.

Other options, such as using a bag-valve mask only or a manual ventilator, may not be suitable for infants who require more delicate handling and where proper equipment might not always be available in an emergency setting. Moreover, mouth-to-mouth only might not provide the necessary seal for effective ventilation. Understanding these techniques and their appropriate contexts ensures that rescuers can respond effectively in emergencies involving infants.