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AP I EXAM 3: EMERGENCE and PACU ICU TRANSPORT
AP I EXAM 3: EMERGENCE and PACU ICU TRANSPORT
What does IV or inhalational anesthetics do to the ventilatory responses?
It blunts it. Both hypercarbia and hypoxemia.
What is apneic threshold?
PaCO2 where spontaneous ventilation is initiated.
CO2 level during emergence process?
Need to increase PaCO2
How do you increase PaCO2?
1. adjust RR & Vt
2. maintain FiO2 > .85 during hypoventilation (except COPD)
What do NMB drugs do?
Interrupt transmission of nerve impulses at NMJ of skeletal muscle.
Succinylcholine
Depolarize the end plate of nicotinic receptor.
1. short duration
2. depolarize end plate, then diffuses away
Dose of succinylcholine?
1mg/kg
Side effects of Sux?
1. bradycardia
2. fasciculation
3. hyperkalemia
4. myalgias
5. malignant hyperthermia
What type of receptor does SUX act on?
Muscurinic
Non depolarizing NMB:
1. inhibits cholinergic receptor
2. does NOT bind to Ach. Just block Ach receptor sites.
3. the non-depolarizers get pushed off as Ach continues to be released.
4. then non-depol get metabolized.
Which muscle is a good monitoring neuromuscular function during intubation?
Orbicularis oculi
Which one is better for emergence?
Adductor pollicis
Which muscle is most resistant to sensitivity?
Vocal cord
Which is most sensitive?
Extraocular
ToF
4 stimulations at 2Hz (0.5s)
Tetany
50-100 Hz usually 5 sec long
Head lift greater than 5 seconds is equivalent to?
ToF ratio > 0.7
0 twitch is equal to percentage of receptors blocked by drug?
99%

1 twitch: 95%
2: 90%
3: 85%
4. 75%
The parent of a child hospitalized with acute glomerulonephritis (AGN) asks the nurse why blood pressure readings are being taken so often. The nurse's reply should be based on knowledge of which of the following?
BP fluctuations are a common side effect of antibiotic therapy
BP fluctuations are a sign that the condition has become chronic
Acute hypertension must be anticipated and identified
Hypotension leading to sudden shock can develop at any time
Acute HTN must be anticipated and identified: Vital signs, in particular BP, provide information about the severity of AGN and early signs of complications. Acute HTN is anticipated and requires frequent monitoring for early intervention.
Reversal is done by what type of drugs?
ANTIcholinesterase

1. inhibits acetycholinesterase
What are some examples of anti-muscurinic?
Glycopyrolate or atropine
Neostigmine
Max is: 0.07mg/kg

Peak onset: 5-10min
Is reversal necessary?
1. make sure if the pt is adequately reversed.
2. if not, then use drugs
How do you assess for adequacy of ventilation?
1. via arterial blood gas
a. PaO2> 65 on FiO2<0.40
b. PaCO2 < 50 torr
2. ETCO2
3. SpO2: >90%
The need for NAW
Establish airway prior to extubation for pts that have obstructive issues:
1. obesity
2. OSA
3. Hx snoring
OSA
CPAP would help

Tongue is usually the tissue that causes the obstruction during sleep.
What usually causes the arousal of OSA pts?
Hypoxia
Factors that increase incidence of PONV?
1. female gender
2. hypotension
3. non smoker
4. pain/narcotic use
5. swallowed heme
6. nitrous oxide
Mechanism of anti-emetics?
Works on the chemotaxic trigger zone brain area.
What receptor antagonist does Zofran act on?

Droperidol?
Serotonin 5-HT3

Droperidol: a dopamine antagonist
Extubation criteria
1. airway reflexes intact
2. clinical stability
3. intact neurological function
4. normal body temp
5. normal coagulation
6. head lift
7. ToF
8. RR: 5-30
9. Vt > 5cc/kg
10. PaCO2 < 50 torr
11. Resting MV < 10L/min
12. LOC
13. muscle relaxant reversed
14. PaO2 > 65 on FiO2 < 0.40
What are some immediate hazards of extubation?
1. laryngospasm
2. vomiting
3. hypoxia/loss of airway
Purpose of deep extubation?
1. minimize tracheal stimulation
2. minimize coughing/bucking

NOTE: coughing causes increased:
1. IOP
2. ICP
3. BP
4. dehiscence
What are the contraindications of deep extubation?
1. difficult mask airway
2. difficult intubation
3. aspiration risk
4. airway edema
Citeria for deep extubation?
1. MAC 1.3
2. NMB COMPLETELY REVERSED.
3. spont. ventilation at reg. rate/rhythm
4. NO AIRWAY REFLEXES
5. 100% O2
6. lidocaine
What should you ALWAYS do when you DEEP extubate a pt?
Keep the oral airway in place
What should you do AFTER you deep extubate?
1. Suction one more time
2. place mask on pt
3. keep hand on bag
4. test for airway patency
5. help them breathe if need be
Awake tracheal intubation criterea?
1. pt breathing 100% O2
2. consider using OAW/NAW/bite block
3. Sx oropharynx
4. deflate cuff
5. adm PPV with bag
6. remove tube