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Conscious Sedation I > Chapter 13: Pharmacology, Anatomy, and Physiology > Flashcards

Chapter 13: Pharmacology, Anatomy, and Physiology Flashcards

1
Q

Respiration is driven automatically by the ________

A

Brainstem (Medulla Oblongata)

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2
Q

Respiration controlled voluntarily by the _______

A

Cerebral Cortex

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3
Q

Anatomy of Upper Airway

A

Nose, Pharynx, Nasopharynx, Oropharynx, Laryngopharynx

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4
Q

Anatomy of Lower Airway

A

Larynx, Trachea, Bronchi, Bronchioles, Respiratory Zone

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5
Q

What does the nose do? What is its function with inhalation sedation?

A

Warms air
Humidifies air
Filters particulate matter
Primary entrance of gases used in inhalation sedation

It is critical that the patient can breathe well (enlarged tonsils, deviated septum, seasonal allergies)

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6
Q

Pharynx

A 
Cylindrical tube of muscles
3 sections
-Nasopharynx
-Oropharynx
-Laryngopharynx
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7
Q

Nasopharynx

A

Behind nasal cavity

Contains adenoids, tonsils, Eustachian tubes

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8
Q

Oropharynx

A

Bordered superiorly by soft palate and inferiorly by the epiglottis
Opens into the mouth

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9
Q

Larygnopharynx

A

Epiglottis

Cricoid cartilage

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10
Q

Larynx

A

Vocal cords
Glottal opening is the narrowest part of the adult airway
Cricoid ring is narrowest part of the pediatric airway (younger 7-10y)
Cough is a protective reflex that stays intact when using N2O.

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11
Q

What is the narrowest part of the pediatric airway (7-10 years and younger)

A

Cricoid ring

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12
Q

What is the narrowest part of the adult airway?

A

Glottal opening

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13
Q

What makes up the respiratory zone?

A

Alveolar duct, sac and alveoli

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14
Q

Trachea

A

part of the lower airway; bifurcates asymmetrically at carina

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15
Q

Bronchi

A
  • R bronchus…2.5cm long and deviates 25 degrees
  • L bronchus…5cm long and deviates 45 degrees
  • L bronchus is smaller and deviates more
  • Aspirated objects usually in R bronchus
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16
Q

Bronchioles

A

Conducting; cannot exchange gases

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17
Q

Physiology of the respiratory mechanism

A

Medullary center in brainstem controls the automatic respiratory process of breathing

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18
Q

What controls the automatic respiratory process of breathing?

A

medullary center in the brainstem

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19
Q

Muscles of the respiratory mechanism

A

Diaphragm
Intercostals
Scalenes
Sternocleidomastoids

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20
Q

Respiratory distress vs. failure

A

abnormal breathing vs. clinical state of inadequate oxygenation, ventilation or both

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21
Q

What happens during inspiration?

A

Diaphragm contracts and creates a negative pressure and air moves in…this continues until lung pressure equals atmospheric pressure

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22
Q

What happens during expiration?

A

Diaphragm relaxes and chest wall recoils

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23
Q

What is tidal volume?

A

Amount of gas inspired into lungs…usually about 500ml

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24
Q

What is minute ventilation?

A

Tidal volume x RR…usually about 6-7l/min

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25
Q

What is anatomic dead space?

A

Portion of inspired air that occupies the conducting airway and does not participate in the exchange of gases

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26
Q

What is air made up of?

A

79% N2
21% O2
0.04% CO2
-gases move from high to low pressure

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27
Q

N2O movement

A

N2O/O2 is administered, high concentrations of these gases is found in the alveoli, the capillary having no N2O is quickly filled. When the N2O is terminated capillary concentrations are higher than alveolar and N2O rapidly moves into the alveoli and is exhaled

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28
Q

Pulse oximetry

A

O2 saturation of arterial blood, oxyhemoglobin concentration
Usually 98-100%
Usually measures HR as well
Pulse Ox measurement below 90% is significant

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29
Q

Is pulse ox required for minimal sedation?

A

Not required for minimal sedation, it is required for moderate sedation

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30
Q

Diffusion hypoxia

A

Results from N2O leaving lungs at a high rate (faster than that of replacement by N2)…diluting the O2
Headache, lethargy, nausea
Prevented by 100% O2 for 5 min and should always be used
Some researchers claim diffusion hypoxia is insignificant

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31
Q

Management of patients experiencing moderate sedation (greater than 50% N2O)

A

Practitioner is responsible for complications in intended level and deeper level
Obstruction of upper airway
Fasting guidelines

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32
Q

What could obstruct the upper airway?

A

Tongue

Foreign body

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33
Q

What should remain intact during moderate sedation?

A

Laryngeal and pharyngeal reflexes should remain intact
Cough
Gag

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34
Q

Obstruction of upper airway caused by foreign body (choking)

A

-Universal distress sign
-Are you choking?
-Heimlich maneuver
-If patient becomes unconscious
(Medical emergency)
-CAB’s
-Chest compressions

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35
Q

Obstruction due to tongue

A

Tongue
Head tilt – chin lift should open airway not caused by foreign body
Partial airway obstruction – snoring – risk factor
Complete airway obstruction – no sounds or exchange of air

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36
Q

should you use a pulse oximeter during moderate sedation?

A

yes - use a pulse ox during moderate sedation

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37
Q

What do you do if someone is vomiting during moderate sedation?

A

Discontinue N2O
Turn head to side
Suction, NOT THE SALIVA EJECTOR

Nedley’s notes: You could vomit and have that go down into the lungs – silent regurgitation
If it’s gastric fluid, that’s less harmful than a breakfast burrito

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38
Q

What are the fasting guidelines for moderate sedation?

A 
Fasting guidelins
		Ingested material		Minimum fasting period
		Clear liquid			2 hours
		Nonhuman milk		6 hours
		Light meals			6 hours
39
Q

How does N2O interact with the cardiovascular system?

A

N2O does not negatively affect the cardiovascular system to produce any significant physiologic changes
N2O has positive effects on myocardial ischemia
N2O may decrease blood pressure but is dose related…usually not affected at concentrations used in the ambulatory care setting

40
Q

How does N2O interact with the CNS?

A

Depresses the CNS…mechanism is unknown

Chronic exposure results in peripheral neuropathy, weakness, ataxic gait

41
Q

How does N2O interact with the respiratory system?

A

URTI…inadequate sedation

  • Expansive, increases pressure in patients with sinusitis
  • Silent regurgitation and aspiration…want to maintain protective reflexes…don’t allow patients to go unconscious vs sleep in pediatric patients, many times patients haven’t fasted
  • Titrate the N2O
  • No reported allergies to N2O
  • Contraindicated in patients on hypoxic drive
    • -COPD
    • -Emphysema
    • -Usually very ill…ASA III or IV
42
Q

Relative contraindications for the use of N2O/O2 sedation

A 
First trimester of pregnancy
Current URTI
COPD’s
Psychologic impairment
Current or recovering drug addiction
Middle ear disturbances
43
Q

recommendations regarding N2O/O2 sedation

A 
Emphysema, MD consult for hypoxic drive
COPD’s, MD consult for hypoxic drive
Tuberculosis, sterilize
HIV, sterilize
URTI, postpone
Pneumothorax postpone
Cystic fibrosis postpone?...No active infection
44
Q

Hematopoetic system

A 
Affects bone marrow after increased concentrations for extended periods may interfere with vit B12 dependent methionine synthase involved in DNA synthesis and erythrocyte production
Ok for
Anemias
Methemoblobinemia
SCA
Leukemia
Hemophilia
Polycythemia vera
45
Q

What is the interaction like between N2O and the endocrine system? What is the endocrine system?

A

No negative effects

the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, among other things

46
Q

Effects of N2O on the hepatic system?

A

no negative effects

47
Q

Effects of N2O on the gastrointestional system?

A

N2O is expansive and is contraindicated in patients with a bowel obstruction
Ask about kid on stool softeners

48
Q

Effects of N2O on the genitourinary system

A

Not during 1st trimester of pregnancy
MD consult for 2nd and 3rd trimesters of pregnancy
Leave decision to use or not use N2O to patient and medical personnel
Ok with kidney disease

49
Q

Effects of N2O on the neuromuscular system

A 
Ok to use with
Multiple Sclerosis
Muscular Dystrophy
Cerebral Palsy
Myasthenia Gravis
50
Q

What are the concerns with N2O on ear and eye?

A 
Ear
Middle ear conditions
Recent ear infections
Eye
Recent surgery…gas bubble in patients that were expose to perfluorpropane or hexafluoride gas could expand and complicate healing
51
Q

What kind of effect does N2O have with sedative medications?

A

synergistic effect

52
Q

What is the interaction with N2O and bleomycin sulfate?

A

bleomycin sulfate is a cancer medication that increases the incidence of pulmonary fibrosis

53
Q

Benefits of using N2O with pediatric patients?

A
  • Nasal hood restricts the field of vision
  • Use O2 only in patients that won’t give consent
  • Sometimes patients aren’t breathing nasally
  • Helps with head position
54
Q

What do you want to ask parents and patients about prior to sedation?

A
  • Abnormalities of major organ systems
  • Previous adverse events with sedation or analgesia
  • Drug allergies, current medications
  • Time and nature of last oral intake
  • History of tobacco, alcohol, or substance abuse
55
Q

ASA I

A
  • Normal healthy patient
  • Patient with no systemic disease
  • Candidate for N2O/O2 sedation
56
Q

ASA II

A
  • Patient with mild systemic disease
  • Mild to moderate physiologic disturbance that is under good control
  • No compromise of normal activity
  • Candidate for N2O/O2 sedation
57
Q

ASA III

A
  • Patient with severe systemic disease
  • Patients with major systemic disturbances that are difficult to control
  • Creates a major impact on surgery or anesthesia
  • Candidate for N2O/O2 sedation following medical consultation
58
Q

ASA IV

A
  • Patient with severe systemic disease that is a constant threat to life
  • Patients with severe and potentially life threatening systemic disease
  • Significantly limits their activity
  • Medical emergencies are likely
  • N2O/O2 sedation is usually not indicated
59
Q

ASA V

A
  • Moribund patient that is not expected to live without an operation
  • Moribund patient in whom surgery is last effort to save their life
60
Q

ASA VI

A
  • Declared brain-dead patient whose organs are being removed for donor purposes
  • Clinically dead but being maintained for organ donation
61
Q

ASA E

A
  • Patient requires emergency procedure

- Designation for a patient in any ASA classification requiring an emergency procedure

62
Q

Pre-procedural patient evaluation

A 
Vital signs
Height
Weight
Body temperature
Blood pressure (BP)
Pulse (HR)
Respiration (RR)
63
Q

What’s measured preoperatively, intraoperatively, and postoperatively?

A

BP, HR, RR usually measured preoperatively, intraoperatively, and postoperatively

64
Q

What do you use to evaluate the airway?

A

Precordial-pretracheal stethoscope

65
Q

Why is a pre-procedure evaluation of the airway necessary?

A

Pre-procedure evaluation of the airway
Uncovers abnormalities that could increase the likelihood of airway obstruction
Positive pressure O2 may be necessary if respiratory compromise occurs during sedation

66
Q

What may be necessary if respiratory compromise occurs during sedation?

A

Positive Pressure O2

67
Q

What needs to be done prior to a pre-sedation appointment?

A

History & Physical exam

68
Q

What are doctors looking for during a history?

A

Previous problems with anesthesia or sedation?
Stridor, snoring, or sleep apnea?
Advanced rheumatoid arthritis?
Chromosomal abnormalities?

69
Q

What are you looking at during a physical exam?

A

Habits, Head and Neck, Mouth, Jaw

70
Q

Concern with habits for sedation?

A

obesity - are they overweight?

71
Q

What kinds of things are you looking for during a head and neck exam?

A 
Short neck
Limited neck extension
Mass
Trauma
Tracheal deviation
Dysmorphic facial features
72
Q

What kinds of things are you looking for when examining the mouth?

A

Limited opening
Macroglossia
Tonsillar hypertrophy
Nonvisible uvula

73
Q

What are you looking for when examining the jaw?

A

Micrognathic
Retrognathic
Trismus

74
Q

What does the ASA task force recommend to monitor during sedation?

A

Level of consciousness
Pulmonary ventilation
Oxygenation
Hemodynamics

75
Q

How can you determine a patient’s level of consciousness?

A

Monitored by the patients response to verbal commands

76
Q

How do you monitor pulmonary ventilation?

A

1) Observation: observe chest rise and fall and check the reservoir bag
2) Auscultation: Pre-trachael stethoscope

77
Q

How do you monitor oxygenation?

A

with a pulse oximeter

78
Q

How often should intraoperative documentation of monitoring vital signs during moderate sedation be done?

A

Intraoperative documentation monitoring of vital signs for moderate sedation is recommended every 5 min

79
Q

How can you be prepared for emergencies?

A
  • BLS certified including management of airway obstruction

- AED

80
Q

Additional equipment needed during emergencies (5 things)

A
  • Antagonist medications
  • Positive pressure ventilation system
  • Adequate suction…not a saliva ejector
  • Advanced airway equipment
  • Resuscitation equipment
81
Q

Titration of N2O/O2 gases

A

Titration is a method of drug administration in which definitive amounts of the substance are given in incremental doses until a specific endpoint is reached; its the current standard of care

82
Q

Using “fixed dose” or rapid induction?

A

Large concentrations of N2O initially, up to 50% used especially in children is not recommended except under specific conditions administered by a trained pediatric dentist

83
Q

Advantages of using N2O

A
  • Only amount of drug required by the patient is given
  • Allows for biovariability
  • Uncovers idiosyncratic reactions early
  • Minimizes negative experiences with oversedation
84
Q

What are the benefits to adjusting N2O levels? When should you increase and decrease levels?

A
  • Great advantage is the ability to adjust the levels of sedation
  • Increase level when more painful approaches
  • Decrease level when procedure nears completion
  • Previous sedation levels are not important?…Biovariability
  • Negative experiences are usually due to oversedation…medication is blamed rather than operator error
85
Q

What are the signs and symptoms of appropriate minimal sedation?

A

Patient is comfortable and relaxed
Patient acknowledges reduced fear and anxiety
Patient is aware of surroundings
Patient responds to directions and conversation
Protective cough and gag reflexes remain intact
Eyes become less active and glazed look appears
Patient may experience…tingling in extremities, heaviness, warmth, light feeling, vasodilation of face and neck

86
Q

Why should you limit talking?

A

Limit talking to receive the drug’s effects

87
Q

Questions should focus on how patient is feeling as opposed to what they are feeling

A
  • Biovariability suggests that some patients will have tingling and others will not
  • If patient doesn’t feel what you told them they should they may believe that the drug is not having an effect
88
Q

What happens during oversedation?

A

Signs of oversedation may not always be obvious
Operator should always be present to monitor the patient
Instruct patient to inform operator if they feel uncomfortable (hard in kids)
Engage the patient verbally periodically to assess response…need constant chatter with kids

Nedley’s Notes:
“what’d you have for breakfast?”
“how does your stomach feel?”
Keep at 50% … can be above for injection… he stays routinely above it because that’s just what the flowmeter says 60%
Tell a story and distract when injecting so they can’t respond

89
Q

Signs and Symptoms of Oversedation

A

Detachment/dissociation from environment
Dreaming, hallucination, or fantasizing
Floating and/or flying
Inability to move, communicate or keep mouth open
Humming or vibrating sounds that progressively worsen
Patient may experience…drowsiness, dizziness, nausea, lightheadedness, fixed eyes, uncomfortable warmth
Patient may progress to…sluggish, delayed responses, slurred words or no verbal response, agitated or combative behavior, vomiting (especially in children), unconsciousness

Nedley’s Notes:
Silent regurgitation - Prevent with patient being NPO, add monitor to listen for signs of vomitus coming up,
If you just turn off the nitrous they’ll wake up and you can’t finish the procedure… just turn it down

90
Q

Why is N2O/O2 called laughing gas?

A

uncontrolled laughter

91
Q

2 Keys to successful administration of N2O/O2?

A
  • Titration of the drug

- Careful monitoring (observe and evaluate)

92
Q

Fundamental principles for appropriate administration

A

Informed consent
Bio-variability, do not adopt a fixed dose philosophy
100% O2 at beginning and end
Do not leave patient unattended
NPO status…will not prevent vomiting but could decrease the chance of aspiration

93
Q

Pre-operative Unit Preparation

A

Equipment
Flowmeters
Scavenging masks
Vacuum system

Conscious Sedation I (9 decks)

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