1 / 19

Oxygen Delivery Devices

Oxygen Delivery Devices. they’re not what you think. Indications for oxygen use. Low ambient O 2 Hypoxemia Suspected hypoxemia Increased work-of-breathing Flaring Tachypnea Increased myocardial work Acute head injury. O 2 delivery systems. High-flow

nayda-hines
Download Presentation

Oxygen Delivery Devices

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Oxygen Delivery Devices they’re not what you think

  2. Indications for oxygen use • Low ambient O2 • Hypoxemia • Suspected hypoxemia • Increased work-of-breathing • Flaring • Tachypnea • Increased myocardial work • Acute head injury

  3. O2 delivery systems • High-flow • Venti-masks (air entrainment masks) • Mechanical aerosol systems • High-flow humidifier systems • Low-flow • Nasal cannula • Simple masks • Partial rebreathing masks • Non-rebreathing masks

  4. Entrainment ratios

  5. Delivered FiO2 with low-flow

  6. What’s my PaO2? • a: On room air? • b: On 0.50 FiO2? • c: On 0.80 FiO2?

  7. The answers: PaO2 = FiO2 x (barometric pressure - water vapor pressure) - PaCO2/RQ PaO2 = FiO2 X (760 - 43) - PaCO2/0.8 a: PaO2 = .21 X 713 - 40/0.8 = 100 b: PaO2 = .50 X 713 - 40/0.8 = 306 c: PaO2 = .80 X 713 - 40/0.8 = 520

  8. O2Hgb dissociation curve % Sat PO2 mmHg

  9. Resorption atelectasis 100% O2 nitrogen oxygen After ~15 minutes, blood N2 is depleted. Poorly ventilated & well perfused units (A) become atelectactic. B A PO2 =673 PCO2 = 40 PH2O = 47

  10. Non-rebreathing system Room air Gas source Expiratory gas Reservoir To patient One way valves

  11. exhaled gas oxygen room air Air entrainment devices

  12. O2Hgb dissociation curve shift ¯pH ­ CO2 ­ temp % Sat PO2 mmHg

  13. What happens to your pO2 and sats when your pH changes? ph = 7.4, pO2 = 100, sat 96% ph = 7.0, pO2 = ?, sat = ?

  14. Oxygen delivery = # trucks X how full they are loaded Xhow fast they go DO2 = 1.38(hgb X sat X CI) + (pO2 X 0.003)

  15. Entrainment ratios

  16. Estimating FiO2

  17. Simple mask • Open ports for exhaled gas • Air entrained through ports if O2 flow through does not meet peak insp flow • 35-55% O2 at 6-10 L/min Exhalation ports O2inlet

  18. Partial rebreather mask • O2 directed into reservoir • Insp: draw gas from bag & ? room air • Exp: first 1/3 of exhaled gas goes into bag (dead space) • Dead space gas mixes with ‘new’ O2 going into bag • Deliver ~60% O2 Exhalation ports O2 Reservoir

  19. Non-rebreathing mask One-way valves • Valve prevents exhaled gas flow into reservoir bag • Valve over exhalation ports prevents air entrainment • Delivers ~100% O2, if bag does not completely collapse during inhalation O2 Reservoir

More Related