Exam 1 Flashcards

1
Q

How many animals are needed to generate a reference interval?

A

minimum of 40 animals

Davis uses about 100

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2
Q

T/F: as prevalence increases, PPV increases and PVN decreases.

A

True

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3
Q

What are the perfusion parameters? (list 6)

A
  1. mentation
  2. mucous membrane colour
  3. capillary refill time
  4. heart rate
  5. pulse quality
  6. extremities temperature
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4
Q

Clinical signs associated with hypovolemia-vasoconstriction (gen. d/t decreased preload)

A
  1. obtundation
  2. pale mucous membranes
  3. slow capillary refill time
  4. tachycardia (cats-brady)
  5. poor pulse quality
  6. cold extremities
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5
Q

Clinical signs associated with vasodilation (gen. d/t decreased afterload)

A
  1. obtundation
  2. hyperemic mucous membranes
  3. very fast capillary refill time
  4. tachycardia
  5. bounding pulse quality
  6. warm extremities
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6
Q

Define: Sedation

A

mild to moderate depression of the CNS

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7
Q

Sedation vs chemical restraint

A

chemical restraint is just heavier sedation

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8
Q

Site of action for local anesthetics

A
  1. Nociceptors
  2. Nerves
  3. Spinal Cord
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9
Q

Site of action for general anesthetics

A
  1. spinal cord
  2. thalamus
  3. cortex
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10
Q

What are the two Risk Classification Schemes?

A
  1. ASA status ( only takes into account patient)

2. Operative Risk ( estimates overall risk)

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11
Q

T/F: Emergency surgeries have the same level of risk as elective surgeries.

A

False: higher mortality rates for emergency

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12
Q

Purpose of pre-anesthetic fasting

A
  • reduce risk of vomiting/ regurgitation

- ruduce size of gi tract in Large Animals

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13
Q

Why give anesthetic pre-medication (pros and cons)?

A
  • decrease apprehension
  • provide analgesia
  • reduce dose of induction and maintenance drugs
  • minimize undesirable autonomic reflexes

Cons:

  • takes time/ organization
  • concerns about polypharmacy
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14
Q

Risk of mortality (during surgery) increases with:

A
  • systemic illness
  • emergency
  • after hours
  • lack of familiarity
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15
Q

Define: pain

A

unpleasant sensory and emotional experience associated with actual or potential tissue damage

nociception =/= pain

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16
Q

Pain Assessment (Physiological variables)

A
  • not sensitive nor specific

- HR, RR, blood pressure, GI sounds

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17
Q

Pain Assessment (Neuroendrocrine variables)

A
  • indicator of disease severity =/= pain

- stress hormones, endorphins, acute phase proteins

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18
Q

Pain Assessment (Objective Physical Measurements)

A
  • weight and food consumption
  • gait analysis
  • activity level
  • nociceptive threshold tests
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19
Q

Pain Assessment (Subjective Assessments)

A

use of pain scales:

  1. one dimensional scoring system
  2. multidimensional
  • good for bringing attention to and documenting many different parameters
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20
Q

One dimensional scoring system (subjective)

A
  • easy to sue
  • not good for small changes
  • high subjectivity
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21
Q

Multidimensional scoring system (subjective)

A
  • behavioral +/- physiological data

- n behaviour must be known + categorized

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22
Q

Acepromazine (drug category, moa)

A

Category: phenotiazine
MOA: central dopamin receptor antagonist

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23
Q

Acepromazine (4 Actions)

A
  1. mild sedation (highly variable)
  2. decreased alertness
  3. anesthetic sparing
  4. lasts a long time (4-6 hours)(non-reversible)
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24
Q

Acepromazine (adverse effects)

A
  1. Vasodilation (peripheral alpha 1 antagonism)
  2. syncope reported in boxers
  3. no analgesic action
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25
Q

Alpha-2 Agonists (drug examples)

A
  1. dexmedetomidine
  2. Xylazine
  3. Romifidine
  4. Detomidine
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26
Q

Alpha-2 Agonists (6 Actions)

A
  1. Sedation (rousable)
  2. Analgesia
  3. Anxiolysis
  4. muscle relaxation
  5. potent drug sparing
  6. reversible effects
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27
Q

Alpha-2 Agonists (Adverse Effects)

A
  1. CV effects (initial vasoconstriction followed by decreased sympa. output)
  2. Diuresis, vomiting, reduced gi motility
  • much more potent in cattle than horses
  • sheep get pulmonary edema
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28
Q

Anticholinergics (dug examples, moa)

A

Drugs: atropine, glycopurrolate
MOA: muscarinic acetylcholine receptor antagonist (parasympatholytic)

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29
Q

Anticholinergics (5 Actions)

A
  1. increased HR
  2. bronchodilation
  3. decreased secretions
  4. decreased GI motility
  5. mydriasis

– no sedative or analgesic properties

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30
Q

Benzodiasepines (drug examples, moa)

A

Drugs: Diazepam, Midazolam
MOA: GABA receptor agonist

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31
Q

Benzodiasepines (6 Actions)

A
  1. Anxiolytic
  2. Amnestic
  3. Muscle relaxant
  4. Anticonvulsant
  5. Mild drug sparing
  6. Reversible
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32
Q

Benzodiasepines (adverse effects)

A
  1. agitation, mania, disinhibition in some healthy adults dogs/ cats
  2. not analgesic
  3. mixed resp. between young and old animals
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33
Q

Opioids (Mu agonist) (drugs, actions)

A

Drugs: morphine, oxymorphone, hydromorphone
Actions: Analgesia, Sedation (dogs, rabbits ruminants) or Euphoria (cats, horses)

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34
Q

Opioids (Mu agonist) (Adverse Effects)

A
  • minimal CV effets
  • resp. depression
  • hot cats, cool dogs
  • reversible
  • variable drug sparing (dog > cat > horse)
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35
Q

Opioids (Mu antag/ Kappa agonist) (all)

A

Drugs: Butorphinol
Short duration of effect (about 1 hour)
limited analgesia + good sedation

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36
Q

Opioids (Mu partial agonist) (all)

A

Drugs: Buprenorphine
acts v similar to agonist, but with less effect for longer
high affinity for receptor = non-reversible

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37
Q

T/F: Therapeutic Index is a measure of drug safety (LD50/ED50) and so a higher TI means a safer drug.

A

True

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38
Q

What is the Selectivity of a drug?

A

the preference of a drug for its respective ligand

normally expressed as a comparison between two receptors

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39
Q

Potency vs Efficacy

A

Potency: the dose needed to create a specific effect (hig potency means lower dose for the effect)

Efficacy: the maximal effect produced

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40
Q

T/F: Antagonists work by producing no intrinsic activity at the target receptor.

A

T: A reverse agonist is different than an antagonist

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41
Q

Non-competitive vs competitive antagonist

A

Non-competitive: decreased binding affinity of agonist to R

Competitive: can overcome antagonims w/ high enough [agonist]

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42
Q

Effects of untreated pain?

A
  • increased SNS activity (change in healing rate)
  • decreased mobility –> muscle wasting
  • splinting of chest muscles and diaphragm
  • decreased GI motility and urinary retention
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43
Q

Non-pharmacological pain management mechanisms (7 ways)

A
  1. handling
  2. nursing care
  3. weight optimization
  4. warm (chronic) and cold (acute) therapy
  5. Acupuncture
  6. dress wounds
  7. env. modifications (ramps vs stairs)
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44
Q

3 Drug types for pharmacological pain management

A
  1. Opioids
  2. NSAIDs
  3. Local Anesthetics

Also, alpha-2-agonists (dex, xylazine), NMDA receptor antagonists (ketamine, amantadine), Gabapentine/ pregabalin, Tramadol

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45
Q

Opioids (pain management)

A
  • moderate to severe pain
CNS: sedation in dogs -- euphoria in cats/ horses
resp. depression
decreased HR (vagal tone decrease)
urinary retention
cool dogs, hot cats
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46
Q

Local Anesthetics

A
  • Lidocaine, Procaine
  • reversibly block Na channels to prevent nerve trans.
  • [drug] and volume affects intensity and duration of effects

Dose dependent toxicity of CNS and CV

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47
Q

NSAIDs

A
  • both acute and chronic pain
  • COX-1,2 inhibitors reduce prostaglandins
  • not behavior modifying + oral formulations
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48
Q

What are the routes of administration of Opioids?

A

IV, IM, SQ, Topical (fentanyl patch)

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49
Q

What are the effects of NSAIDs

A
  • anti-inflammatory
  • anti-thrombosis
  • analgesia
  • anti-endotoxin
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50
Q

Why would you pair Xylazine (alpha 2) with morphine?

A

Xylazine will have synergistic effects

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51
Q

Indications for Ketamine, Amantadine?

A
  • chronic pain, antihyperalgesic
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52
Q

Define: hernia

A

defect in wall of body cavity that allows protrusion of an organ or organs

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53
Q

Hernia anatomy

A
  • Ring (connective tissue)
  • Sac
  • Contents
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54
Q

True vs False Hernia

A

True - congenital or degenerative process w/ intact hernial sac (peritoneum)

False - no hernia sac; usually acute/ traumatic

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55
Q

4 Causes of hernia

A
  1. congenital
  2. acquired/ degenerative
  3. traumatic
  4. incisional
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56
Q

Why treat a hernia?

A
  • pain
  • protect viscera
  • adhesions
  • abnormal organ fx
  • strangulation, incarceration, perforation, sepsis
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57
Q

Incarcerations vs strangulation

A

Incarceration - impeded organ fx

Strangulation - impeded blood flow

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58
Q

Herniopathy ( 3 parts)

A
  • reduction of contents
  • repair of defect
  • prevent recurrence
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59
Q

Oral Absorption (Cats vs Ruminants)

A

Cats:

  • shorter GI
  • intermittent eating
  • slow esophageal transit time

Ruminants:

  • degredation/ metabolism in rumen
  • rumen dilution effects
  • pH variation of rumen vs saliva
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60
Q

Drug Metabolism (cats vs dogs)

A

Cats: no glucoronidation
Dogs: no acetylation

61
Q

Drug Clearance (variations)

A
  • dogs have higher GFR than horses causing higher clearance rates
62
Q

ADME in Pediatric patients

A

A: decreased
D: increased % of TBW
M: decreased hepatic enzymes
E: decreased renal fx

63
Q

ADME in Geriatric patients

A

A: decreased
D: decreased CO, albumin; increased body fat
M: decreased hepatocyte #
E: decreased renal fx

64
Q

Loading Dose Eq

A

(target C)(Vd) / (F)

65
Q

What is the most common approach to the equine abdomen?

A

ventral midline

66
Q

Possible approaches to the Equine abdomen?

A
  1. Ventral midline
  2. Paramedian
  3. Parainguinal
  4. Laprascopic
  5. Flank
67
Q

Ventral Midline Approach (Equine)

A
  • most common approach

- Most colic surgeries (allows exteriorization of 75% of GI w/ minimal hemorrhage)

68
Q

Linea Alba

A
  • extends from xyphoid to prepubic tendon

- dense connective tissue made from the ext. abdominal oblique and transverse abdominus aponeurosis

69
Q

Closure of the ventral midline

A
  1. Linea Alba
  2. Subcutaneous Layer
  3. Skin
70
Q

Paramedian Approach

A
  • 8-12 cm lateral to midline
  • more hemorrhage (going through muscle)
  • main holding layer for closing is the external sheath of the rectus abdominus
71
Q

Parainguinal Approach

A
  • 12-14cm incision
  • gain access to the bladder (for stones)
  • used for cryptorchid fixing
72
Q

Laprascopic Approach

A
  • most commonly done standing w/ sedation

- ovariectomy, cryptorchidism, exploratory, close nephro-splenic space

73
Q

Flank Approach

A
  • not common in horses

- ovariectomy, uterine torsion, small colon

74
Q

Equine Rectal Exam (purpose)

A
  • look for gas distension, tight bands, impaction, distended small intestine
75
Q

How to prevent rectal tears?

A
  • lots of lube

- gentle palpation, relax w/ contraction

76
Q

IV vs Inhalent Anesthetic Induction

A

IV: must have vein, titrate dose to effect, rapid onset, typically smooth, (alfaxalone, ketamine, propofol)

Inhalent: when IV is difficult, stressful for animal, CV depression, env. pollution (isoflurane, sevoflurance, desflurane)

77
Q

T/F: Injectable anesthetics cannot be removed and overdose can be fatal

A

T

78
Q

What is the end effect of redistribution of anesthetic in the body

A

redistribution is the mech by which anesthetics move from CNS to other tissues to allow for waking up (in IV anesthetics; inhalants will saturate)

79
Q

Why do we pre-oxygenate?

A
  1. hypoventilation or apnea
  2. delayed intubation
  3. sensitive to hypoxemia
80
Q

Alfaxalone (cat, MOA, Effects)

A

Category: neuroactive steroid
MOA: enhances GABA at GABAa receptors
FDA: dogs and cats (IM formulation available)
Effects: min CV depres, mod resp depres, rapidly metabolized –> suitable for total IV anesthesia (dogs), recovery can be rough

81
Q

Ketamine (cat, moa, effects)

A

Category: cyclohexanones
MOA: NMDA receptor antagonist uncouples sensory and motor systems
FDA: cats and primates (IV, IM, SQ, PO)
Effects: anesthesia and some analgesia, muscle rigidity, sympa NS stimulant, min, resp depression

82
Q

Propofol

A

Category: hindered phenol
MOA: enhances GABA at GABAa receptors
FDA: dogs
Effects: mod. CV and Resp depression (fast admin = apnea), anesthesia and no analgesia, caution for cats, smooth recoveries

83
Q

IV Anesth. Maintenance (pros/ cons)

A

Pros:

  • increase depth quickly
  • limited costs/ overhead
  • simple/ can be made complex

Cons:

  • reduction in depth can be slow
  • can be rough recovery
84
Q

Inhalant Anesth. Maintenance (pros/ cons)

A

Pros:

  • depth easily controlled
  • recovery requires no metabolism
  • admin via ET tube
  • {drug} can be measured

Cons:

  • need anesthetic machine
  • atm. pollution and toxicity
  • limited portability
85
Q

Inhalant Maint. (common agents)

A
  • Isoflurane
  • Sevoflurane
  • Desflurane
86
Q

Minimum Alveolar Concentration (MAC)

A
  • alverolar [inhaled anesthetic] at which 50% of subjects fail to move in response to supramaximal noxious stimuli
  • ED95 =~ 1.3 MAC
87
Q

Factors that decrease MAC

A
  • sedatives, analgesics, inj. anesthetics
  • systemic disease, hypothermia
  • increasing age, pregnancy
88
Q

Inhalant Solubility

A

Iso > Sevo > Des>

lower solubility = fast onset/ offset, but less potent

89
Q

Inhalant Clinical Effects

A

CNS depression
NOT analgesic
dose dependent decrease in CO and BP (vasodilation and negative inotropy)

90
Q

PE signs of dehydration (hydration parameters)

A
  1. Skin Turgor
  2. Mucous Membrane Moisture
  3. Eye Position
  4. Body Weight
91
Q

How does BCS affect skin turgor test?

A

fat holds onto water so BCS 8 dog can be dehydrated without presenting turgor test positive

92
Q

How to correctly interpret BW for dehydration status?

A

only use for day to day measurements

93
Q

Determining Deficity Volume

A

% dehydration (0.05 - 0.12) x BW(kg)

94
Q

Crystalloid Fluids

A

LRS, Plasmalyte, 0.9% NaCl

good when patient 165>Na>130

95
Q

Maintenance Fluid Rates

A

2-4mL/kg*hour

96
Q

Potassium Supplementation (fluids)

A

max safe = 0.5mEq/ kg*hour

higher blood [K] means lower mEq/L KCl administered

97
Q

Colloids in Fluid Therapy

A

Colloids - high MW molecules that largely remain IV to generate oncotic pressure
NAtural: Albumin
Synthetic: Hetastarch, Vetstarch

98
Q

Colloids (possible adverse effects)

A
  • coagulopathy
  • increased risk of renal injury
  • pruritis
  • anaphylaxis (rare)
99
Q

Why give IV fluids in anesthetized patients?

A
  • replace fluid loss (evaporation)
  • meet maintenance requirements
  • compensate for losses (hemorrhage)
  • replace deficits
  • ultimate goal is to maintain tissue perfusion
100
Q

Pre-existing fluid deficits and anesthesia?

A

try to rehydrate prior to anesthesia as dehydration may become more severe during surgery

101
Q

Why give isotonic crystalloids?

A
  • can give large columes
  • minimal electrolyte imbalances
  • bicarb precursors minimize pH changes
102
Q

What’s the problem with the traditional fluid plan (10-20mL/kg*hour)

A
  • rates are likely excessive

- leads to fluid accumulation (interstitial edema, decreased 02 transfer)

103
Q

Why is there altered fluid balance during anesthesia?

A
  • change in vascular tone/ blood pressure
  • decreased urine production and output
  • degradation of glycocalyx (endothelial protective layer) promotes extravasation
104
Q

What is the most effective type of opioid analgesic?

A
  • mu receptor agonists
105
Q

Do alpha-2-agonists (Xylazine, dex) have a significant effect on the CV system?

A

yes

106
Q

Can you use Xylazine to produce sedation w/out ataxia in a horse?

A

No

107
Q

Meloxicam can be used as an analgesic in an aged cat with renal failure?

A

No, NSAIDs further reduce GFR making it not suitable

108
Q

Glycopyrrolate offsets the vagally-mediated decrease in heart rate produced by initially giving morphine?

A

True

109
Q

What drug combination would be the MOST appropriate choice for pre-anesthetic medication in a friendly but extremely hyperactive 12-month old 20kg dog prior to elective ovariohysterectomy (OVH) in student surgery lab?

A

Opioid (painful surgery) + Ace (anxiolytic/ sedation mainly)

110
Q

Give an example of an ASA 1 animal.

A

18 month-old dog with a skin laceration

any minor wound that poses no threat to the animal’s wellbeing overall

111
Q

Which of the injectable benzodiazepines would be the best choice for IM administration?

A

Midazolam

Diazepam is not for IM as it is poorly soluble in water

112
Q

Morphine causes a non-specific mast cell degranulation

A

True

113
Q

Does Acepromazine do analgesia?

A

no

114
Q

Does smaller suture mean tighter knots?

A

yes

115
Q

Generally, you should always try to use the smallest suture that is suitable to use?

A

True

116
Q

Function of breathing circuits

A
  • deliver O2 and anesthetic; remove O2

- provide means of ventilation

117
Q

Minute Ventilation

A

(Tidal Volume) * (Respiratory Rate)

118
Q

What is the most popular type of non-rebreathing system?

A

Bain Circuit

119
Q

Non-rebreathing system facts

A
  • low resistance
  • simple and inexpensive
  • rebreathing prevented by high gas flow rate
  • used w/ smaller animals (<10kg)
120
Q

What type of rebreathing system would you use in smaller animals?

A

Non-rebreathing system

121
Q

Minimum flow rate for a non-rebreathing system

A

FGF of 200 mL/ kg*min with an overall minimum of 500mL/ min

122
Q

Bain Circuit facts

A
  • inspired [anesth] = vaporizer setting
  • very little time lag
  • Gas is cool and dry (heat and h2o loss)
    • pressure ventilation possible
123
Q

Rebreathing Circuit facts

A
  • ability to remove CO2 from exhaled gases prior to rebreathing
  • more parts/ complexity
  • can use much lower gas flow rates
124
Q

Track the path of a Circle System circuit

A

yeah . boi

125
Q

Reservoir Bag

A
  • provides a means by which to ventilate patient
  • allows visible and tactile obersvation of breathing
  • bag size = 5 * Tidal Volume
126
Q

CO2 absorption (rebreathing)

A
  • needs H2O
  • Ca(OH)2 is main chemical
  • Signs of exhaustion = granules harden, color change
127
Q

In a rebreathing circuit how should flow rate and minute ventilation match up?

A
  • They should be roughly equal during anesthesia

- As anesthesia begins, it is ok to have higher flow rate to prime the line with anesthetic

128
Q

Scavenging Waste Gases (anesthetic circuits)

A
  • use a charcoal waste canister to collect the gases
129
Q

Breathing Circuit hazards

A
  • disconnection issues
  • increased deadspace
  • pressure buildup in circuit
130
Q

Why place an ET tube?

A
  • maintain patent airway
  • ability to deliver gas
  • ability to manually ventilate
  • some protection against aspiration
131
Q

Two cuff types

A
  • high pressure, low volume

- low pressure, high volume

132
Q

Rule of Thumb: you should always try to place the largest ET tube that comfortably fits in the trachea

A

True

133
Q

Where can a misplaced ET tube go?

A

Esophageal

Pharyngeal

134
Q

Intubation techniques (species differences)

A
  • Blind (horses, rabbits)
  • Manual (cattle)
  • Direct Visualization (most domestic species)
  • using a guide tube (difficult to visualize)
135
Q

Laryngeal Sensitivity Scales

A

cats&raquo_space; dogs > horses

136
Q

What species is particularly sensitive to largyngospasm? How will you treat this?

A

Cats; treat by applying lidocaine to the arytenoids prior to intubating

137
Q

How will you secure the ETT?

A
  • gauze tie, plastic tube

- tie onto tube ( do not constrict the tube and occlude)

138
Q

Intubation complications

A
  • upper airway trauma
  • tracheal trauma (overinflated cuff)
  • tracheal tears
139
Q

Confirming ET tube placement

A
  • visual
  • bag movement
  • fogging of tube
  • gas out of tube
  • palpation
140
Q

What are Halsted’s principles (6 of them)?

A
  • good surgery practices
  • gentle handling of tissues
  • aseptic technique
  • preservation of blood supply + careful hemostasis
  • removal of dead space
  • avoidance of tension
  • accurate tissue apposition
141
Q

What are the two types of suture needles?

A
  1. Taper - sensitive tissues (GI, Bladder, muscle)

2. Cutting - easily cuts through increased collagen tissue

142
Q

Things to consider in suture choice?

A
  • rate of tensile strength loss (PDS - longterm strength)
  • knot security (primary site of failure)
  • handling characteristics
  • tissue reactivity (suture granuloma)
143
Q

Surgical Site Infection (SSI)

A
  • not the same as tissue reactivity
  • inflammation =/= infection
  • amount of suture used is inversely related to number of bacteria needed in SSI
  • use monofilament if possible
144
Q

Suture Tension

A
  • excessively tight suture can reduce blood supply
  • too loose –> incision gap
  • goal: hold tissue in apposition while leaving room for inflammation
145
Q

Suture Handling Characteristics

A
  • material memory
  • tendency to return to original shape after deformation
  • monofilament has more memory than multifilament
146
Q

What color tank is oxygen?

A

green

147
Q

Function of the pin index system (anesth. machine)

A

safety feature to prevent connection of wrong gases

148
Q

O2 flush valve

A
  • deliver 35-70 L/ min at 50-60 psi (very high flow and pressure)
  • used to check or flush circuit when patient is disconnected
  • never use on non-rebreathing circuit –> death
149
Q

function of the control valve

A
  • reduce pressure from 50-60psi –> 15psi