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BDS4 > Sedation > Flashcards

Sedation Flashcards

1
Q

9 principles of GDC?

A
  1. Put patient’s interests first
  2. Communicate effectively with patients
  3. Obtain valid consent
  4. Maintain and protect patient’s interests
  5. Clear and effective complaints procedure
  6. Work with colleagues in way that is in patients interest
  7. Maintain, develop and work within our professional knowledge and skill
  8. Raise concerns if pt at risk
  9. Ensure personal behaviour maintains confidence in us and dental profession
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2
Q

What is conscious sedation?

A

Technique which uses drugs to depress CNS but are able to maintain verbal contact with pt

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3
Q

Which medical conditions are aggravated by stress of dental treatment and therefore may be indications for sedation?

A

Ischaemic heart disease
Hypertension
Asthma
Epilepsy
UC
Crohn’s

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4
Q

Medical conditions which affect cooperation and therefore may be indications for sedation?

A

Movement/learning difficulties
Spasticity disorders
Parkinsons

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5
Q

Psychosocial issues which may be indication for sedation

A

Phobias
Gagging
Persistent fainting
Idiosyncrasy to LA

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6
Q

Causes of dental anxiety?

A

Trauma
Learned (parents,playground)
Fear of criticism
Lack of communication
Invasion of body orifice
Surgery appearance
Staff continuity
Age
Socioeconomic group

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7
Q

Dental procedures which may indicate sedations?

A

Surgical extraction of wisdom teeth
Ortho extractions
Implants

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8
Q

ASA Classification?

A
  1. Normal healthy pt
  2. Mild systemic disease
  3. Severe systemic disease
  4. Severe systemic disease that is a constant threat to life
  5. Moribund pt who is not expected to survive without operation
  6. Brain dead pt whose organs are being removed for donor purposes
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9
Q

Medical contraindications to IV sedation?

A

Intracranial pathology
COPD
Myasthenia gravis
Hepatic insufficiency
Pregnancy and lactation

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10
Q

Medical contraindications to inhalational sedation?

A

Blocked nasal airway
COPD
Pregnancy

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11
Q

Social contraindications to sedation?

A

Uncooperative
Unaccompanied
Children- for IV
Elderly

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12
Q

Dental contraindications to sedation?

A
  1. Procedure too difficult for LA alone
  2. Procedure too long/ traumatic
  3. Spreading infection: airway threatening, limits LA
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13
Q

Advantages of sedation?

A

Decrease dentist/staff/pt stress
Fewer medical incidents
More productive appointments

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14
Q

Disadvantages of sedation?

A

Training/equipment required
Recovery time and after care

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15
Q

Indications for Inhalation sedation(IS)?

A

Anxiety
Needle phobia
Gagging
traumatic procedure
Medical conditions aggravated by stress
Unaccompanied adults requiring sedation

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16
Q

Contraindications for IS?

A

Common cold
Tonsillar/adenoidal enlargement
Severe COPD
first trimester of pregnancy
Fear of mask/claustrophobia
Pt with limited ability to understand

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17
Q

Equipment required for IS?*

A

Gas cylinders
Pressure reducing valves
Flow control meter
Reservoir bag
Gas delivery hoses
Nasal hood
Waste gas scavenging system

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18
Q

Components of flow control meter?*
Emergency measures within it?

A

Quantiflex oxygen flow meter
Mixture control dial
Flow control knob
Nitrous oxide flow meter
Air entrapment valve
Oxygen flush button

Air entrapment valve- if gases fail, valve opens allows room air into circuit
Oxygen flush button- flushes 35l O2/min

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19
Q

What is a reservoir bag?*

A

2/3L bag
Moves with each inspiration/expiration
Helps monitor respiration

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20
Q

What are gas delivery hoses?*

A

1 hose delivers fresh gases from machine
1 hose delivers waste gas to scavenging system
Non return valve in expiratory limb prevents rebreathing expired gases

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21
Q

Advantages of IS?

A

Rapid onset(2-3mins)
Rapid peak action(3-5mins)
Depth altered either way
Flexible duration
Rapid recovery
No injection for sedation
Few side effects
Drug not metabolised
Some analgesia
No amnesia

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22
Q

Disadvantages of IS?

A

Equipment/gases expensive
Space occupying equipment
Not potent
Requires ability to breathe through nose
Staff addiction
Difficult to accurately determine actual dose

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23
Q

Signs of adequate IS?

A

Patient relaxed/awake
Reduced blink rate
Laryngeal reflexes/vital signs unaffected
Gag reflex obtunded
Mouth open on request
Decreased reaction to painful stimuli
Decrease in spontaneous movement
Verbal contact maintained

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24
Q

Symptoms of adequate IS?

A

Mental and physical relaxation
Decreased reaction to painful stimuli
Paraesthesia- lips,fingers,toes
Lethargic/euphoria
Detachment
Warmth
Altered awareness of passage of time
Dreaming
Giggles

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25
Q

Signs and symptoms of over sedation of IS?

A

Repeated mouth closing
Spontaneous mouth breathing
Nausea/vomiting
Irrational and sluggish responses
Decreased cooperation
Incoherent speech
Uncontrolled laughter,tears
Patients not enjoying effects
LOC

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26
Q

Preoperative instructions for IS?

A

Light meal before
Take routine medication
Children accompanied by competent adult
Adults accompanied at first sedation appointment then may come alone
No alcohol on day of appointment
Sensible clothing
Arrange care of children
Plan to remain in clinic for 30mins after appointment

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27
Q

IS technique?

A

Set up machine
Select nasal hood
Connect to hoses
Set mixture dial to 100% O2
Settle pt in dental chair
Reinforce explanations of procedure

Set flow to 5-6l per minute
Position hood on patient’s nose

Encourage nasal breathing
Check reservoir bag movements(small movements=decrease flow, large movements=increase flow)

Check pt comfortable with hood
Ask pt to signal when begins to feel different
Reduce o2 by 10%
Wait 1 min and repeat
After o2 reached 80% reduce by 5% per minute
Stop titration when pt ready for treatment

Constant reassurance and hypnotic suggestion
Monitor for signs and symptoms of adequate sedation- if pt over sedated increase o2 in 5-10% increments until satisfactory sedation- if pt under sedated decrease o2 in 5% increments until satisfactory sedation

For recovery gradually increase o2 by 10-20% per minute until 100%
Administer 100% o2 for 2-3 mins to prevent diffusion hypoxia
Remove hood and turn gas flow off
Return pt to upright slowly, giving praise/reassurance

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28
Q

What is diffusion hypoxia

A

May occur with administration of inadequate amounts of o2 during or immediately after n2O anaesthesia
Influences partial pressure of oxygen

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29
Q

Success rate for IS

A

50-90%
Difference due to: pt populations
Greater success for ortho extractions
Poorer in pt with pain

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30
Q

On completion of treatment under Is, what should be done?

A

Adult pt may leave unaccompanied at dentists discretion
Child pt must be accompanied by competent adult
Ask pt how they felt procedure went
Reassure pt that feeling shivery is normal

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31
Q

Describe the mechanics of breathing?

A

Diaphragm used for quiet breathing
Inspiratory muscles contract
Increased thoracic volume
Decreased thoracic pressure
Air pushed in along pressure gradient
Expiration is passive
Intercostal and accessory muscles used for more forceful breathing

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32
Q

Fill in names

A
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33
Q

How does pulmonary gas exchange take place?

A

Gas exchange occurs between alveolar air and pulmonary capillary blood
Gases move across alveolar wall by diffusion
Diffusion is determined by partial pressure gradients

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34
Q

How is gas transported in blood?

A

O2 and co2 are transported in blood
Erythrocytes play important role in transport of both
Haemoglobin important for o2
Nitrous oxide doesn’t bind to haemoglobin
Nitrous oxide is carried in simple solution in blood

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35
Q

Structure of haemoglobin?

A

Globular protein
MW= 68000
2 alpha and 2 beta protein chains
4 haem groups: porphyrin ring, Fe atom
Fe reversibly binds o2
200-300 Hb molecules/rbc

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36
Q

What do Bohr shifts in Hb-O2 dissociation curves show?

A

Shift to left= increased affinity for O2 caused by decreased temp, increased pH
Shift to right= decreased affinity for o2 caused by increased temp, decreased pH

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37
Q

How is breathing controlled?

A

Voluntary, automatic process.
Breathing rhythm generated by respiratory centres in brainstem
Basic rhythm modified by signals from various sensory receptors

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38
Q

Which sensory receptors send signals to respiratory centres for control of breathing?

A

Peripheral chemoreceptors
Central chemoreceptors
Joint and muscle receptors
Lung stretch receptors

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39
Q

What is hypoxic hypoxia?

A

Decreased o2 reaching alveoli
Decreased o2 diffusion into blood

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40
Q

What is anaemic hypoxia

A

Decreased o2 transport into blood

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41
Q

What is stagnant (ischaemic) hypoxia?

A

Decreased o2 transport in blood

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42
Q

What is cytotoxic hypoxia?

A

Decreased o2 utilisation by cells

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43
Q

What is cyanosis?

A

Blue colouration of skin, mucous membranes
Due to >5gm deoxygenated Hg/deoxyhaemoglobin of blood (1/3rd of normal)
2 main forms: central and peripheral

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44
Q

What is central cyanosis?

A

Generally due to decreased o2 delivery to blood, hypoxic hpoxia:
- low atmosphere po2
- decreased airflow in airways
- decreased o2 diffusion into blood
- decreased pulmonary blood flow
- shunting

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45
Q

What is pulmonary cyanosis?

A

Due to decreased o2, delivery to localised and peripheral part of body.
Often due to decreased blood flow to tissues- stagnant hypoxia

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46
Q

How to manage patients with involuntary movements?

A

Assessment: mental and physical status, anxiety, pain experience

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47
Q

How to manage patients with learning difficulties?

A

Assessment:
Will behaviour management be possible?
Is pharmacological management needed?
Sedation or GA or both?

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48
Q

What are some conscious sedation techniques?

A

Inhalational
IV
Oral
Transmucosal- rectal

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49
Q

What can be used for IV sedation?

A

Midazolam
Propofol

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50
Q

Advantages of oral/transmucosal sedation?

A

Avoid cannulation
Can make induction more pleasant
Better cooperation/ future behavior

51
Q

Disadvantages of oral/transmucosal sedation?

A

Baseline reading
Bitter taste
Lag time
Untitrateable
Difficulty in monitoring level of sedation
Behaviour in recovery

52
Q

How to decide between GA and sedation?

A

Safety (controlled airway with GA/ difficult intubation)
Cooperation
Waiting lists and access to services
Pain
PMH
Still a need for a GA

53
Q

Describe remimazolam?

A

Benzodiazepine ring and methyl ester molecule
Rapid breakdown and onset
Distribution half life 0.5 to 2 min
Terminal elimination half life 7 to 11 mins

54
Q

Differences between midazolam and remimazolam?

A

M vs R- Distribution half life(4-18mins vs 0.5-2mins) Elimination half life(1.5-2hrs vs 7-11mins)

55
Q

Complications of cannulation in IV sedation?

A

Venospasm
Extravascular injection
Intraarterial injection
Haematoma
Fainting

56
Q

What is venospasm?

A

Disappearing vein syndrome

57
Q

How to manage venospasm?

A

Time dilating vein- worse with repeated attempts
Warm water/ gloves in winter

58
Q

What is an extravascular injection?

A

Active drug placed into interstitial space

59
Q

How to manage extravascular injection?

A

Prevention: good cannulation, test dose of saline
Treatment: remove cannula, apply pressure, reassure

60
Q

How to manage intra arterial injection?

A

Prevention: avoid anatomically prone sites- ACF Medial to biceps tendon.
Palpate before attack

Management:
-Monitor for loss of pulse(cold,discolouration)
- leave cannula in situ for 5mins post drug
- remove if no problems
- symptomatic leave and refer to hospital (procaine 1%)

61
Q

What is a haematoma?

A

Extravasation of blood into soft tissues due to damage to vein walls

62
Q

Prevention of haematoma?

A

Good cannulation technique
Pressure post operatively
Care with elderly

63
Q

Treatment of haematoma?

A

Time
Rest
Reassurance
If severe: - initial ice pack- moist heat 20 mins after 24 hours- consider heparin containing gel

64
Q

What to do if pt faint?

A

Lift legs over head

65
Q

Complications of IV drug administration?

A

Hyper/hypo responders
Paradoxical reactions
Oversedation
Allergic reactions

66
Q

Reasons for hyporesponders?

A

May be due to tolerance: BZD induced, cross tolerance, ideopathic

67
Q

What are paradoxical reactions?

A

Appear to sedate normally
React extremely to all stimuli
Relax when stimuli removed
Check for failure of LA
Do not go on adding sedatives
Watch immature teenagers

68
Q

How to manage oversedation

A

Stop procedure
Try to rouse pt
ABC
If no response to stimulation and support reverse with flumazenil 200micrograms then 100micrograms increments at minute intervals- watch for 1-4 hours

69
Q

Management of respiratory depression?

A

Check oximeter
Stimulate pt- ask to breathe
Supplemental oxygen- nasal cannulae 2 litres per minute
Reverse with flumazenil

70
Q

How to manage loss of airway control and/or respiratory arrest?

A

Stimulate pt/assess consciousness
Maintain/clear airway
Ventilate pt
Reverse sedation
Consider other medical incident

71
Q

Complications of IS

A

Oversedation
Pt panics

72
Q

Order of assessment for IV sedation?*

A

PMH, DH, SH
EO, IO, Vital signs
Treatment Plan
Consent
Information for pt and escort

73
Q

Questions to ask during DH for IV sedation?*

A

Referral source
Previous bad experience
Previous sedation/GA
Symptoms
Discuss Proposed procedure

74
Q

What should there be special emphasis on during MH for IV sedation?

A

Drug history
Drug allergy
Previous sedation/GA
Recreational drug use

75
Q

Which drugs increase sedative effects of midazolam?

A

Alcohol
Opiods
Erythromycin
Antidepressants, antihistamine, antipsychotic
Recreational drugs

76
Q

How would u ASA classify a pt who is a current smoker, pregnant, well controlled epilepsy, well controlled asthma, NIDDM, BP=140-159/90-94, Obesity (30-<40)?

A

ASA 2

77
Q

How would u ASA classify a pt with IDDM, >6/12 post MI, >6/12 post CVA, stable angina, COPD, BP=160-199/95-114, BMI>40?

A

ASA 3

78
Q

How would u ASA classify pt with unstable angina, <3/12 post MI, <3/12 post CVA, severe COPD, BP>200/115?

A

ASA 4

79
Q

Where should an ASA1 pt be treated?

A

May be treated in primary care

80
Q

Where should an ASA 2 pt be treated?

A

May be treated in primary care

81
Q

Where should an ASA 3 pt be treated?

A

Should be secondary care

82
Q

Where should an ASA 4 pt be treated?

A

Must be secondary care

83
Q

What conditions do sedatives affect?

A

Almost all sedative agents cause respiratory depression
Psychiatric disease- sedatives may trigger neurosis/ psychosis
Theoretical risks to pregnancy

84
Q

What is a term used to describe interactions between drugs which have similar or antagonistic pharmacological effects when given IV sedative?

A

Pharmacodynamic interactions-
Examples:
Antidepressants + BDZ’s
Antihypertensive + BDZ’s

85
Q

What are pharmacokinetic interactions?

A

1 drug alters absorption, distribution, metabolism or excretion of another, thereby increasing or reducing amount of drug available to produce its pharmacological effects

86
Q

What vitals signs are assessed prior to IV Sedation?

A

HR
BP
Oxygen saturation
BMI

87
Q

What measurements are underweight, healthy, overweight and obese for BMI?

A

<18.5= underweight
18.5-24.9= healthy weight
25-29.9= overweight
>30= obese

88
Q

What is the BMI cut off for sedation and fir the chair in terms of weight?

A

BMI 35 and 28 stones

89
Q

What are the ideal properties of an IV sedation agent?

A

Anxiolysis
Sedation
Ease of administration
Non- irritant
Quick onset/ recovery
No side effects
Low cost

90
Q

What are the actions of Benzodiazepines?

A

Acts on receptors in CNS to enhance effect of GABA( gamma amino butyric acid)- prolongs time for receptor repolarisation
Mimics effects of glycine on receptors

*GABA- cerebral cortex and motor circuits
GABA- inhibitory CNS neurotransmitter
Glycine- brainstem and spinal cord

91
Q

How do benzodiazepines cause respiratory depression?*

A

CNS depression and muscle relaxation
Decreases cerebral response to increased CO2
Synergistic relationship with other CNS depressants
Increased respiratory depression in already compromised patients

92
Q

What affect do benzodiazepines have on CV?*

A

Decreased BP by muscle relaxation decreasing vascular resistance
Increased HR due baroreceptor reflex compensating for BP fall

93
Q

Side effects/ effects of benzodiazepines?

A

Drug interactions(erythromycin, antihistamines)
Tolerance
Dependence
Sexual fantasies

Increased respiratory depression
Decreased BP
Increased HR

94
Q

Properties of diazepam?*

A

Elimination half life= 43+/-13 hours
Redistribution half life=40 mins
Metabolites
Risk of rebound sedation
Dose= 0.1-0.2mg/kg
Long recovery
Unpredictable

95
Q

Properties of midazolam?

A

One preparation is 5mg/5ml
PH= 3.5
Elimination half life=90-150 mins
Metabolised in liver
Extra hepatic metabolism in bowel so less affected by liver disease

96
Q

Benefits of midazolam vs diazepam?

A

Painless
Quicker onset/ recovery
2-3 times more potent
More reliable
Water soluble vs insoluble(not written in benefits- just something to mention)

97
Q

Who is part of sedation team?

A

Operator- sedationist
Dental nurse
Runner
Receptionist
All must have appropriate sedation training- must be able to manage sedation related emergencies- annual ILS training and sedation scenario training

98
Q

Why is a butterfly cannula not recommended?

A

Metal
Clots and obstructs
Easily dislodged

99
Q

Where are the sites of cannulation?

A

Dorsum of hand: accessible, superficial and visible, poorly tethered, affected by peripheral vasoconstriction so may need to warm hand
Antecubital fossa: brachial artery and median nerve, keep lateral, second choice, less stable

100
Q

Describe procedure for IV sedation?

A

Pre-op pulse and BP
Escort must stay in building
Consent
Cannulation
High volume aspiration
Pulse oximeter
NIBP monitoring every 5-10mins
Drug administration- midazolam- 2mg bolus- 1mg increments every 60 seconds- max 7.5 mg generally
Emergency- flumazenil, means of ventilation

101
Q

How do u know that u are at end point of IV sedation?

A

Slurring/slowing of speech
Relaxed
Delayed responses to commands
Willingness to accept treatment
Verrill’s sign-ptosis
Eve’s sign loss of motor coordination

102
Q

What is the procedure for recovery after IV sedation?

A

Escort can be with pt during recovery
60 mins after last increment
Cannula needs to be removed before leaving
Ensure pt can walk unaided
Escort given post op instructions

103
Q

Treatment for respiratory depression?

A

Talk, shake, hurt
Head tilt, chin lift, jaw thrust
O2 (2l/min via nasal cannulae)
02 (5l/min via hudson mask)
Flumazenil
Ambu bag
Airways

104
Q

Properties of flumazenil?

A

Preparation 500mcg in 5ml
Dose-200mcg then 100mcg increments every 60s until response seen
Shorter half life than midazolam-50 mins
Risk of resedation

105
Q

What are the key points for a pt under conscious sedation?

A

Remains conscious
Retains protective reflexes
Understands and responds to verbal commands

106
Q

What are the stages of the paediatric pt assessment?

A

History
Pt factors
Goals
Treatment plan

107
Q

What takes place in paeds history for sedation?

A

Pain
Nature of anxiety
DH
MH

108
Q

What is included in the pt factors assessment for paeds sedation?

A

Understanding
Coping style
Cooperation

109
Q

What anxiety assessment tools are there for paeds sedation?

A

Adapted Faces version of Modified Child Dental Anxiety Scale (MCDASf)
Score 9-45 (9=no dental anxiety, >31=extreme dental fear)

110
Q

Whose goals are included in the paeds sedation assesssment?

A

Pt
Parent
Clinician

111
Q

What is used for the management of pain and anxiety in the treatment plan for paeds sedation?

A

NPBM
LA
GA
Sedation

112
Q

How can LA be given to children?

A

Some will use Wand STA system

113
Q

Examples of non pharmacological behaviour management?

A

Hypnosis
CBPT

114
Q

What gases are used in IS for children?

A

Nitrous oxide and oxygen

115
Q

IS indications for paeds?

A

Age
Anxiety level
Management of gag reflex
Medical considerations
PDH
dental needs

116
Q

IS contraindications

A

Age
Anxiety level
Medical considerations
PDH
Dental needs
Pt choice

117
Q

What must u do during IS treatment of child?

A

Keep talking to pt- continue behaviour management
Ensure child avoids mouth breathing
Monitor- max dose when child feels tingling or starts giggling- stop if ears ringing or sore head
Postoperative instructions

118
Q

What is common after IV sedation in children?

A

Amnesia

119
Q

IV indications in paeds?

A

Age
Anxiety levels
Medical considerations
PDH
Dental needs

120
Q

IV Contraindications in paeds?

A

Age
Anxiety levels
Medical considerations
Dental needs

121
Q

What is TCI Propofol in paeds?

A

Target controlled infusion sedation- useful for very long and very short procedures- mean rapid onset and recovery

122
Q

What is an alternative form of sedation for paeds?

A

Oral and transmucosal sedation- midazolam- less controlled- cannulation

123
Q

What is CBT?

A

Provides psychoeducation and uses behavioural modification techniques and cognitive restructuring skills to challenge unhelpful behaviours and beliefs- effective in helping people with dental anxiety, depression, PTSD

BDS4 (50 decks)

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