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Fundamentals of RT

Fundamentals of RT - Units 4-5 SPC

Boiling point of Oxygen? -183C or -297F @ 1ATM
1 cubic foot of liquid O2 = ? 860 cubic feet of gaseous O2
1 cubic foot of gaseous O2 = ? 28.3L of gas
What is the cylinder volume ofE?G?H?K? E = 22 CU. FT.G = 187 CU. FT.H = 244 CU. FT.K = 275 CU. FT.
What are the colors and uses of medical gases?O2?CO2?He?N2?N2O?He/O2? O2 = Green - TherapyCO2 = Gray - LabHe = Brown - LabN2 = Black - LabN2O = Blue - AnesthesiaHe/O2 = Brown/Green - Therapy
Organizations NFPA? Regulates storage and handling as well as central supply gas and piping systems
Organizations DOT? Regulates cylinder construction, testing and transport
Organizations CGA? Sets all saftely standards ASSS, PISS, DISS
Organizations FDA? Set medical gas purity standards
PISS (Pin Index Safety System) Yoke regulators of smaller cylinders E-AA
DISS (Diameter Index Safety System) Threaded male body to female inlet port, used in central piping and flowmeter outlets
ASSS (American Standard Safety System) Threaded outlet from the stem of large cylinders G,H,K to hex nut of regulator
Thorpe Tubes COMPENSATED, needle distal to float, float will jump upon insertion, read accurately with back pressure
Duraton of Flow Calculation PSIG times the Factor all divided by Flow
Cylinder Factor of E? G? H? E = .28, G = 2.41. H = 3.14
1 LB of liquid O2 converts to how many L gaseous O2? 344L
What are Oxygen concentrators? Electrically powered units that use mloecular sieves containing Zeolite to absorb N2, H2O, and CO2 from air. At ,6L/M, 92-97% delivered
Alveolar Equation PAO2 = FIO2(PB-H2O) - PaCO2/.8If FIO2>.60 eliminate /.8Quick and dirty - 7 x FIO2 - CO2
O2 - Hypoventilation Noted in COPD w/elevated PaCO2 and HCO3, develop hypoxic drive via peripheral chemoreceptors, as PaO2 above 60 mmHg, dive is diminished leading to hypoventilation
Absorption Atelectasis High FIO2> . 50 = Nitrogen washout of alveolar gas. With bronchial obstruction alveolar collapse(atelectasis) may occur as O2 is absorbed in the blood
Oxygen Toxicity Caused by elevated PIO2 = damage to lung tissue, increased free radical, edema and fibrosis
ROP - Retinoparthy of Prematurity Noted in babies, High PaO2> 80mmHg (American Academy of Pediatrics), leads to scarring and blindness
Goals of O2 Therapy 1. Treat Hypoxemia 2. Reduce WOB 3. Reduce myocardial workload as PVR is decreased
Indications for O2 Therapy 1. Documented Hypoxemia = PaO2 < 60mmHg and SaO2 < 90% 2. Suspected Hypoxemia from acute M/I and severe trauma
Clinical Manifestations of Hypoxemia Tachycardia, tachypnea, cyanosis, restlessness, confusion, pulmonary hypertention
Responsive Hypoxia Increase in PaO2 with FIO2 due to V/Q mismatch, use low or high flow O2 device
Refractory Hypoxemia PaO2 demonstrates minimum response with increase FIO2 due to shunting, use PEEP or CPAP to maintain constant airway pressure
Low Flow Systems - Under 15L/M Will not meet pt peak inspitory needs, nasal cannualas - 2-4L, transtracheal O2 cateter, Simple mask - 6-10L, Partial and Non-rebreather masks 12-15L
Air/O2 ratio 100-%(L air)/%-20*, *use 21 if FIO2< .40
Calculate Total Flow Flow x AIR/O2 = total flow
What is Reservoir Tubing used for? Maintain FIO2, and increase L flow by adding tubing
Created by: mac6672