T2 - Blueprint (Josh) Flashcards
V/Q Ratio:
Avg ventilation is —
Avg perfusion is —
Which means, normal V/Q Ratio is —
V = 4 L/min
Q = 5 L/min
V/Q = 4/5 = 0.8 (more perfusion than ventilation)
What would cause a V/Q less than 0.8?
less O2 going into the the blood in lungs
- Shunting
What would cause a V/Q more than 0.8?
less blood getting into the alveoli than normal
- PE
- Cardiogenic shock
What level of shunting is abnormal?
What level of shunting is life-threatening?
greater than 10%
greater than 30%
What is the horizontal axis of the Oxyhemoglobin curve?
Vertical axis?
PaO2 (oxygen unbound and able to get to tissue)
SaO2 (oxygen bound to Hgb)
When the Oxyhemoglobin Curve shifts right, what does this mean?
Hgb gets rid of O2 more readily
- Hypercapnia
- Acidosis
- Rise in 2,3 DPG
- Fever
When the Oxyhemoglobin Curve shifts left, what does this mean?
Hgb holds on to the O2 so it doesn’t perfuse to tissue
- Alkalosis
- Low CO2
- Low temp (CoLd)
- Low 2,3 DPG
- Increased Carb. Monoxide
What are two ways to estimate shunting?
A-a Gradient (10-20 mmHg normal)
PaO2/FiO2 Measurement (normal is 286)
What does a wide A-a gradient (greater than 20 mmHg) mean?
more O2 in alveoli than in arterial blood
indicating there is a lot of shunting going on
With V/Q Mismatch, the A-a gradient is —
With Alveolar Hypoventilation, the A-a gradient is —
wide (because the O2 in alveoli isn’t perfusing well)
normal (because the Alveoli aren’t getting O2)
Is this a health lung?
PaO2 = 95
FiO2 = 50%
95 divided by 0.5 = 190
not a healthy lung function
too much shunting
normal should be 286
ABGs:
Normal PaO2
Normal PaCO2
PaO2 = 80-100 mmHg
PaCO2 = 35-45 mmHg
ABGs:
Normal Bicarb
21-28 mEq/L
- rises when acidic to buffer
ABGs:
Normal SaO2
95-100
What is a normal PETCO2?
20-40 mmHg
- Partial Pressure of End Tidal CO2
***Measures amount of expired CO2 in exhaled air
What conditions raise PETCO2?
anything that reflects inadequate gas exchange or an increase in cellular metabolism (both of which increase production of CO2)
- Hypoventilation
- Bronchial intubation
- Partial airway obstruction
- COPD
- Fever
- Increased CO and BP
What conditions lower PETOC2?
anything that reflects poor pulmonary ventilation
- PE
- Apnea
- Hypothermia
- Sedation
- Sleep
- Cooling
- Reduced CO and BP
Bronchoscopy:
NPO how long?
8 hrs prior
***assess gag reflex before allowing to drink
Bronchoscopy:
What about a fever?
mild fever around 24 hours is not uncommon
Thoracentesis:
How much can be withdrawn daily?
1000mL
Thoracentesis:
Why do we need them to deep breath post procedure?
help expand the lungs
BNC:
Rates?
FiO2?
1-6 L/min
24-44%
Simple Mask:
Rates?
min of 5 L/min
***monitor for aspiration
***no humidity
Partial Rebreather:
Rates?
FiO2?
6-11 L/min
60-75%
***1/3 Vt with each breath
Nonrebreather:
Rates?
FiO2?
12-15 L/min
greater than 90%
Aerosol Mask
Rates?
FiO2?
never less than 8 L/min
28-100%
Aerosol Mask:
What do we nee do with FiO2 amounts greater than 50%?
high flow setup
Tracheostomy Mask/Hood:
Rates?
FiO2?
never less than 8 L/min
28-100%
What is the most accurate way to deliver O2?
Venturi Mask
***ideal for CO2 retainers
How do you determine correct placement of ETT?
End-tidal CO2 detector
Auscultate x 5
Inspect chest expansion
CXR to determine depth (3-4 cm above carina)
With ETT, what pressure should cuff be?
14-20 mmHg
When suctioning ETT, what should we NEVER use?
saline
ETT Extubation Process
Hyperoxygenate first
Suction ET and Oral cavity
Rapidly deflate cuff
Remove at PEAK INSPIRATION
Instruct client to cough
Monitor q 5 mins
Trach:
How can we prevent aspiration of food?
elevate HOB at least 30 ins after eating
Trach:
How often should we turn client?
q 1-2 hrs and support out of bed activities and early ambulation
Trach:
What kind of swabs and mouthwash?
those without ETOH
Chlohexidine
Mechanical Ventilation:
What are the Modes we talked about?
AC (Assist Control)
PRVC
Synchronized Intermittent Mandatory Ventilation (SIMV)
BiPAP
CPAP
Mechanical Ventilation:
What are the Setting we talked about?
Tidal Volume (Vt)
Mniute Ventilation
I:E Ratio
Rate
FiO2
PIP (Peak Inspiratory Pressure)
CPAP
PEEP (Positive End Expiratory Pressure)
Pressure Support
Mechanical Ventilation:
How is Minute Ventilation calculated?
MV = RR x Vt
RR = 12 and Vt = 600
Then, MV = 12 x 0.6 = 7.2 L/min
Mechanical Ventilation:
What is normal I:E ratio and what would we set it at for COPD?
normal is 1:2
set at 1:4 for COPD to prevent breath stacking
Mechanical Ventilation:
Which setting provides positive pressure at end of expiration?
Which setting provides positive pressure at beginning of inspiration?
PEEP
Pressure Support
Mechanical Ventilation
Which setting augments the patients own Vt?
Pressure Support
***assists movement of air through tubing in order to augment the client’s Vt
Mechanical Ventilation:
— is the amount of pressure it takes for ventilator to deliver Vt or breath.
Number changes from breath to breath
PIP
**if increases, look for kink, biting, or mucous plug
Describe the Cardiovascular Compromise that being on a Vent can cause?
Increases intrathoracis pressure, which leads to
decreased venous return, which leads to
decreased preload, which leads to
decreased CO and BP, which leads to
tachycardia, hepatic dysfunction, renal dysfunction and impairment of cerebral venous return (ICP)
VAP:
What are some things we can do to prevent VAP?
HOB elevated 30-45 degrees
ETT w/ dorsal lumen to allow continuous suction above cuff
Oral care
Handwashing
What are included in ventilator bundles?
VAP precautions
DVT precautions
Gastric Reflux precautions
Sedation vacations
What would CSF lead look like with a nose bleed?
positive glucose test
***halo on filter paper