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Terms
Definitions
CVP - Normal values; related to…
2-6 mmHg; Right heart fx
PAP - Normal values; related to…
25/8 Mean 14 Range 9-18 mmHg; Lungs
PCWP - Normal values; related to…
4-12 mmHg; Left heart fx
CO - Normal values
4-8 L/min
Usual cause high CVP
Fluid overload, diurese
When CVP low
Usually dehydration or vasodilation, give fluids or vasoconstrictors
Possible pathology increased CVP
Right heart failure, cor pulmonale, tricuspid valve stenosis
(xray)Central venous catheter placement
Tip should rest in right atrium or vena cava
(xray) Pulmonary artery catheter placement
Tip should be over the right lower lung field
Most common complication of PA catheter insertion
Arrythmias
How you will know you are in the pulmonary artery
Dicrotic notch
How to fix pressure dampening (dicrotic notch absent)
a. Check for air bubbles b. Aspirate (to remove potential clot)
c. Flush catheter
d. Rotate catheter
Hb range
12-16 gm/dL
Vd/Vt - Formula; range
PaCO2-(PeCO2)/PaCO2; 20-40%, up to 60% if ventilated
High Vd/Vt usually relates to
Pulmonary embolus
Alveolar air equation (PAO2)
((Pb-PH2O)FIO2) - PaCO2/0.8
A-a Gradient - Formula; values
A-aDO2 = PAO2 - PaO2; Normal 25-65. 65-299 = V/Q mismatch, >300 = shunt
It is best to obtain the A-a gradient when
The patient is on 100% FIO2
Arterial Oxygen Content - Formula; values
CaO2 = (Hbx1.34xSaO2) + (PaO2x0.003);
Venous Oxygen Content - Formula; values
CvO2 = (Hbx1.34xSv02) + (PvO2x0.003);
Arterial-Venous Oxygen Content Difference - Values
C(a-v)O2; Normal 4-5 vol%; difference INCREASES when Qt is DECREASING
Best measurement of oxygen being delivered to the tissues
CaO2
The CvO2 should be drawn from
Pulmonary artery
P/F ratio - values
Normal >380 (PaO2 of 80/21%), <200 ARDS
Fick Equation
Qt = VO2/C(a-v)02x10
If a BP cuff and an arterial line display different values. Trust the
BP cuff
Neonate, acceptable PaO2
50-80 mmHg, all other values same
(xray) Obliterated costophrenic angles; concave superior surface; meniscus
Pleural effusion
(xray) Flattened diaphragm
Air trapping
(xray) Radiolucent
Normal
(xray) Fluffy infiltrates, butterfly/batwing pattern
Pulmonary edema
(xray) Air bronchogram
Pneumonia
(xray) Ground glass, honeycomb, reticulogranular
ARDS/IRDS
(xray) Thumb sign
Acute epiglottitis
(xray) Steeple sign
Croup
(xray) Airway placement
2-5 cm above carina; level w/ 4th rib/T-4, aortic knob
(xray) Chest tube placement
Should be in the neural space
Primary Dx tool for bronchiectasis
Bronchogram
Used to determine risk for aspiration
Barium swallow
Low K+ can cause
Metabolic alkalosis
Hypokalemia - cause; ECG
Excessive fluid loss (vomiting, dehydration); Flattened T-wave
Cl- follows
Na+
Eosinophils associated w/
Asthma, allergic reactions
Monocytes associated w/
TB
PT - use; values
Monitors Warfarin (Coumadin) Therapys, 12-15 sec
APTT - use; values
Monitors Heparin therapy; 24-32 sec
Acid Fast stain
Tuberculosis
Culture
Identifies organism
Sensitivity
Identifies which antibiotics kills organism
TcPO2/TcPCO2 electrodes should be moved
Q4H
TcPO2/TcPCO2 calibration
Room air and zeroing solution
Best indicator of perfusion
Urine output
Dry non-productive cough
Think cancer
Digital clubbing
Chronic hypoxemia (think COPD)