Use this method if you cannot perform mouth-to-mouth rescue breathing
because the casualty has a severe jaw fracture or mouth wound
or his jaws are tightly closed by spasms. The mouth-to-nose method
is performed in the same way as the mouth-to-mouth method except
that you blow into the nose while you hold the lips closed with
one hand at the chin. You then remove your mouth to allow the
casualty to exhale passively. It may be necessary to separate
the casualty's lips to allow the air to escape during exhalation.
