Fall 2019 RNSG 1341 W4 21 Goes with Resp Modalities 21(1).docx - Respiratory Masks Nasal Cannula A nasal cannula is used when the patient requires a low

Fall 2019 RNSG 1341 W4 21 Goes with Resp Modalities 21(1).docx

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Respiratory Masks Nasal Cannula: A nasal cannula is used when the patient requires a low to medium concentration of oxygen for which precise accuracy is not essential. This method allows the patient to move about in bed, talk, cough, and eat without interrupting oxygen flow. Flow rates in excess of 4 to 6 L/min may lead to swallowing of air or may cause irritation and drying of the nasal and pharyngeal mucosa. Partial Rebreather Mask: Partial rebreathing masks have a reservoir bag that must remain inflated during both inspiration and expiration. The nurse adjusts the oxygen flow to ensure that the bag does not collapse during inhalation. A high concentration of oxygen can be delivered because both the mask and the bag serve as reservoirs for oxygen. Oxygen enters the mask through small bore tubing that connects at the junction of the mask and bag. As the patient inhales, gas is drawn from the mask, from the bag, and potentially from room air through the exhalation ports. As the patient exhales, the first third of the exhalation fills the reservoir bag. This is mainly dead space and does
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