(7) Determine the duration of flow by dividing the available liters by the flow
rate. For example, a cylinder with 288 available liters of oxygen that is to be
administered at a rate of 10 lpm will reach the safety level and need to be replaced by a
new cylinder after 29 minutes (288 / 10 = 28.8; fractions of a minutes are rounded up or
down, as appropriate).
e. Apply the Nasal Prongs or Non-Rebreathing Face Mask.
(a) Place the tips of the prongs in the patient's nose.
(b) Position the prongs so that the tips do not extend more than one
inch (2.5 cm) into the nose.
(c) Adjust the flow rate to the prescribed rate. A flow rate of one to six
liters per minute should provide an inspired oxygen concentration of 22 to 44 percent,
depending on the patient's breathing pattern.
(d) Secure the headband or retaining strap so that it is comfortable for
the patient and is sufficient to hold the apparatus in place.
(e) Fasten the tubing to the pillow and bed clothing. Ensure that the
tubing is secure and is not kinked or crimped.
(2) Non-rebreathing face mask. The patient who requires low, constant
concentrations of oxygen and whose breathing pattern varies greatly may need to use
the Venturi mask, especially if the patient is prone to retain carbon dioxide.
Obtain the proper size mask.
(b) Before applying, hold the mask near the patient's face to show him
how it and the retaining strap are to be placed.
(c) Start the oxygen at the prescribed rate. This is done prior to the
placement of the mask since the patient may be less apprehensive if he hears the
oxygen coming through the mask.
(d) Place the mask on the patient's face. Tell the patient to breathe
naturally while you are adjusting the mask over his mouth and nose.
(e) Adjust the headband or retaining strap so that it is comfortable for
the patient and holds the mask securely in place.