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Anesthesia > Previous Notes > Flashcards

Previous Notes Flashcards

1
Q

How to differentiate between ASA 1-6

A

ASA 1: normal, healthy, non smoker
ASA 2: controlled systemic disease, no functional limitation (ie controlled HTN/DM, pregnant, smoker)
ASA 3: severe systemic disease w/ functional limitation (morbid obesity, ESRD on HD)
ASA 4: severe disease that is constant threat to life (ESRD but not on routine HD, recent <3mo TIA/MI, HFrEF, valve dysfunction)
ASA 5: moribund, not expected to survive without OR (ie massive trauma, ICH w mass effect, ruptured AAA)
ASA 6: brain dead, organ retrieval

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2
Q

Do we continue or stop these meds prior to surgery:
- ACEi/ARB
- Diuretic
- alpha 2 agonist

A
  • ACEi/ARB: STOP - due to risk of refractory hypotension, need vasopressin or norepi
  • Diuretic: STOP - due to risk of hypokalemia from loop diuretics and hypovolemia
  • Alpha 2 agonist: CONTINUE - risk of rebound HTN
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3
Q

Do we continue or stop these meds prior to surgery:
- Metformin
- MAOi (selegiline)
- TCA (nortriptyline)
- Betablockers

A
  • Metformin: CONTINUE in healthy patients
    STOP in renal disease or surgeries affecting renal fx due to risk of metformin induced metabolic acidosis
  • MAOi (selegiline): CONTINUE - risk of pre-op HTN, but be wary and avoid meperidine (5HT reuptake inhibit) due to risk of Serotonin Syndrome and avoid sympathomimetics ie ephedrine and phenylephrine risk of hypertensive crisis
  • TCA (nortriptyline): CONTINUE - check ECG in pre-op for prolonged QT and wide QRS due to sodium channel blockade
  • Beta blockers: CONTINUE - risk of rebound HTN
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4
Q

Perioperative risks of morbid obesity and #1 cause of mortality in obese patients

A

risk of airway obstruction (hypercarbia), reduced wound healing/infection, hyperglycemia

DVT > PE is #1 cause of mortality in obese patients

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5
Q

What anatomy pertains to nausea?
Medication effects on areas?

A

Area postema: medulla, controls vomiting and opioids act in this area to trigger nausea

Nucleus tractus solitarii: dexamethasone acts on this

chemoreceptor trigger zone: near base of 4th ventricle which involve receptors of 5-HT, dopamine, and opioid (IE ondasetron)

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6
Q

What are MOA of ondasetron and aprepitant? side effects?

A

ondansetron: 5HT antagonist at chemoreceptor trigger zone

SFX: prolonged QT > headache > transaminitis > dystonia > cardiac event

aprepitant: NK1 receptor antagonist

SFX: malaise, rash, nausea

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7
Q

What are MOA of scopalamine and droperidol? side effects?

A

Scopalamine: antimuscarinic

SFX: dry mouth, tachycardia, blurry vision, urinary retention, constipation
(Tx anticholinergic crisis with physostigmine)

Droperidol: CNS antidopaminergic

SFX: extrapyramidal symptoms, dystonic rxn, prolonged QT

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8
Q

Mechanism of metoclopramide, uses?

A

Central: antidopaminergic
Peripheral: cholinergic agonist

  • Increases lower esoph sphicter tone
  • Use for enhanced GI motility
  • PONV dose must be 25-50mg, otherwise ineffective at PONV for primary or secondary agent
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9
Q

Aspiration ppx regimen, who is at higher risk?

A
  • Metoclopramide (antidopamine)
  • Ranitidine (H2 antagonist, longer acting and less sfx than cimetidine)
  • Na bicarbonate in pregnancy

High risk: pregnancy, delirium, severe DM (delayed gastric empty), hiatal hernia, morbid obesity, scleroderma, emergent surgery

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10
Q

What decreases lower esophageal sphincter tone? What increases it?

A

Lowers: pregnancy, obesity, inhaled anesthetics, opioid, propofol

Increases: succinylcholine, metoclopramide

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11
Q

Where will aspirated material usually end up in Supine patient

A

Posterior segment of right lower lobe

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12
Q

Anterior vs posterior ischemic optic neuropathy risk factors and presentation

A

Painless loss of vision, sluggish pupils

Anterior- risk after cardiac surgery
Posterior- risk after spine surgery

Vascular rf - prone, cad, dm, smoking, spine fusion, htn

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13
Q

Phase 1 vs phase 2 hypothermia

A

Phase 1: 1st hr anesthesia, heat loss from drug induced redistribution usually 1-2 degrees

Phase 2: heat loss due to radiation&raquo_space; conduction, convection, evaporation

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14
Q

Describe neonates thermogenesis

A

Nonshivering thermogenesis from brown fat and skeletal muscle triggered by norepi, corticosteroids, and thyroxine

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15
Q

Drugs eliminated by RBC esterases

A

Remifentanil
Esmolol
Clevidipine

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16
Q

Drugs eliminated by pseudocholinesterase (aka plasma cholinesterase)

A
  • Succinylcholine
  • Ester-type LA (1× i), procaine, benzocaine, tetracaine
  • Mivacurium

(Amide-type LA is two i’s, Lidocaine, bupivicaine, ropivicaine)

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17
Q

CYP and opioid pharmacology of codeine, hydrocodone, and oxycodone

A

CYP 2D6 activates codeine into morphine and also activates tramadol (peds have higher sensitivity to codeine due to higher CYP2D6 activity than neonates)

CYP2D6 metabolizes oxycodone into oxymorhone and noroxycodone which are weaker, and also hydrocodone into hydromorphone (strong active metabolite ie dilaudid)

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18
Q

SSRI and st John wort effects on CYP

A

St John wort induces CYPs

Most SSRI inhibit 3A4 and 2D6 like fluoextine, paroxetine, and sertraline

(2D6 is for opioid metabolism)
(3A4 for propofol, midazolam, Lidocaine metabolism)

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19
Q

How does Beta 2 agrenergic agonism cause bronchodilation

A

GPCR causes increase of cAMP and decrease of intracellular Ca

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20
Q

symptoms of propofol infusion syndrome

A

metabolic lactic acidosis
rhabdomyolysis
hyperkalemia
renal failure
HLD (high triglycerides)
pancreatitis
cardiac failure

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21
Q

NMDA receptors are activated by what and how do they function

A

activated by glutamate

increase intracellular Ca from depolarized voltage gated Ca channels

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22
Q

Ketamine MOA

A

NMDAr antagonist by blocking glutamate

indirect GABA/mu agonism

direct negative inotrope activity but causes CNS stimulation that increases sympathetic outflow

dissociates thalamus from the RAS

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23
Q

Etomidate MOA

A

GabaA agonist

can cause adrenal suppression by inhibiting 11Bhydroxylase

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24
Q

medications used to treat muscle spasms

A

baclofen
dantrolene
tizanidine
diazepam

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25
Q

anesthesia drugs metabolized by CYP3A4

A

propofol, alfentanil, midazolam, lidocaine

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26
Q

what are IgE-related symptoms of with adverse reaction to medications

A

urticaria
angioedema
dyspnea
dysphagia
bronchospasm
anaphylaxis

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27
Q

what effect does intrapulmonary or intracardiac shunts have on gas vs IV inductions?

A

intrapulmonary shunt will slow gas induction but no effect on IV induction with higher effect on less soluble gas

intracardiac right>left shunt will slow gas induction and increase IV induction

intracardiac left>right shunt has no effect on gas or IV induction speed

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28
Q

what is the physiology of muscle action potential

A

presynaptic nerve depolarizes from Ca channels which releases ACh

Postsynaptic nerve has ACh receptors which activate Na channels that lead to action potential

motor end plate, nicotinic AChr require two ACh or one succinylcholine molecule (which is 2x ACh attached by acetate methyl), these bind at the alpha subunits

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29
Q

what is prochlorperazine moa and use? what are risks and subsequent treatment?

A

antidopaminergic, can be used for nausea

risk of dystonia (facial/neck spasms)/extrapyramidal symptoms, treatment is diphenhydramine or benztropine

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30
Q

what is the pathway of pain signaling

A

1st order = transduction to dorsal horn
2nd order = dorsal horn decussate to contralateral spinothalamic tract and ascends to thalamus
3rd order = thalamus to postcentral gyrus

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31
Q

what type of information does the spinothalamic tract carry

A

crude touch, pain, and temperature

32
Q

when blocking nerves what characteristics influence which are first to be blocked

A

small n are blocked before larger n due to having larger SA:Vol ratio (ie more exposure to LA)

myelinated nerves are blocked before unmyelinated nerves (unmyelinated nerves have more SA to cover than myelinated for access to receptors)

sensitivity to LA order:
C > a- delta > a-beta > a-alpha

33
Q

what do these nerves sense/purpose, size, and myelination status:
A-alpha
A-beta
A-delta
C

A

A-alpha: motor, myelinated and large size

A-beta: touch, myelinated and medium size

A-delta: sharp pain, myelinated small

C: temperature, preganglionic unmyelinated

34
Q

Dosing for neostigime and glycopyrrolate for reversal

A

Neo: 0.04-0.07 mcg/kg
Glyco: 0.2mg per 1mg of neo

Titrate in 1cc each every 5-10min

35
Q

How to calculate time remaining of O2 cylinder

A

Maximum pressure of E cylinder is 2200psig

Formula:
Hours remaining = cylinder factor × remaining pressure/(flow rate in L/min)

D = 0.16
E cylinder = 0.28

36
Q

what are the three inhibitory descending pathways that play a role in CRPS?

A

serotonergic, muscarinic, and noradrenergic

37
Q

what functions does Mu1 opioid receptor contribute to?

A

analgesia and physical dependence

38
Q

What is the delta opioid receptor involved in?

A

analgesia, physical dependence, and antidepression

39
Q

compare metabolites of morphine: M3G and M6G

A

M3G is asoc with hyperalgesia, agitation, myoclonus, and delirium

M6G is assoc with drowsy, Nausea/vomit, coma, respiratory depression

40
Q

what characteristics of alfentanil allow for its fast onset

A

lowker pKa, meaning high amounts are not ionized
approximately 6.5 for pKa and 89% non-ionized

moderate lipid solubility

41
Q

mechanisms of tramadol

A

NMDA antagonist, SNRI, and weak opioid R agonist

42
Q

how is codeine metabolized

A

CYP2D6 will activate codeine into morphine

43
Q

NSAIDs effects on prostaglandins

A

decrease PG synthesis which will result in decrease centrally transmitted pain signals at the dorsal horn and decrease substance P and glutamate

44
Q

How does gabapentin work?

A

works as an anticonvulsant and alleviates neuropathic pain and it decreases glutamate by binding to the alpha2-delta subunit of the voltage gated Calcium Channel

45
Q

What are the risk factors for post-puncture headache following attempted epidural injection

A

young female, thin, pregnant, previous PDPH, larger needle, beveled needles over pencil tip, and air LOR over saline

46
Q

what is the duration of holding therapeutic vs ppx lovenox prior to conducting neuraxial procedure?

A

therpeutic enoxaparin = 24hr
ppx enoxaparin = 12 hr

47
Q

which type of local anesthetic has higher rates of allergic reaction?

A

aminoamides such as lidocaine have methylparaben which has historically caused higher rates of rxn

48
Q

when considering a high spinal, what levels are the cardiac accelerators located

A

T1-4

49
Q

during femoral nerve block, what does it mean when you nerve stim a patellar twitch vs a sartorius twitch

A

femoral nerve gives rise to the saphenous nerve which innervates the medial lower leg and foot

causing patellar twitch indicates correct proximity to the femoral nerve

causing sartorius twitch means you need to proceed lateral and deeper

50
Q

what is the difference between adductor canal block and the femoral block

A

both aim at the distal branches of the femoral nerve (saphenous) but ADDC block is noninferior to femoral block and has less ris kof falls. Indicated for knee surgery

51
Q

popliteal fossa nerve block aims at what? what are the distal branches of nerves here?

A

sciatic nerve which divides into the common peroneal and posterior tibial nerve in the popliteal fossa

common peroneal further divides into the deep peroneal which gives sense between 1-2 toes and and motor to the toe extensors and anterior tibialis, and the superficial peroneal which sense to the dorsum of foot and evert foot

posterior tibial n gives off sural nerve branch at the gastrocnemius which provides sense to the posterolateral calf

52
Q
A
53
Q

are the layers of a tap block?

A

external oblique, internal oblique, and transversus abdominus

54
Q

what is the function of musculocutaneous nerve and which block will directly cover this?

A

axillary block or can isolate MCn at coracobrachialis

MC nerve gives sense to lateral forearm and motor to the brachialis

55
Q

what are the max lidocaine and epi doses during tumescent liposuction

A

max lidocaine dose is 35-55mg/kg with amx concentration of 0.1%

max epi dose is 0.055mg/kg (1:1,000,000)

56
Q

what nerve provides afferent sensory info for the gag relfex

A

glossopharyngeal n

57
Q

how does ability to prognath compare to mallampati score for difficult airway

A

prognath ability has higher PPV and accuracy than MP

58
Q

what structure are you moving during jaw thrust maneuver

A

lifting genioglossus muscle which anchors the tongue to the mandible

59
Q

what is the equation for SVR and how to convert woods to dynes

A

SVR = 80(MAP-RAP)/CO

where RAP is similar to CVP

60
Q

during right dominant cardiac anatomy, what supplies the AV node? what about in left dominant anatomy?

A

right dominant: posterior descending artery supplies AV node

left dominant: left circumflex can occassionally supply but usually supplied by right coronary

61
Q

what are the major venous structures of the heart?

A

coronary sinus drains most of the heart and empties into the the junction of the right atrium and the vena cava

great cardiac vein: LAD/LCA
anterior cardiac vein: RCA
middle cardiac vein: PDA

62
Q

what is ficks principle state

A

oxygen uptake of a tissue is equal to the product of the oxygen delivered to the tissue and the difference in oxygen content of the blood approaching and leaving the tissue

63
Q

Ficks equation of oxygen consumption. what can you calculate with this

A

vO2 = CO(CaO2-CvO2)
where vO2 is consumption

64
Q

amiodarone mechanism, indications, SFX, and contraindications

A

block potassiun channels, class III antiarrhythmic

used fro refractory ventricular arrhythmia

however sfx include bradycardia, hypotension, and prolonged QT

cIND: complete heart block and preexisting bradyacardia

65
Q

nicardipine mechanism, metabolism

A

calcium channel blocker

directly causes cerebral vasodilation with mild inc in CBF

hepatic metabolism, has increased half life in liver failure patients

no effect on cardiac function, purely systemic by decreasing afterload with arterial dilation

66
Q

diltiazem mechanism

A

CCB that acts peripherally and on cardiac

cardiac depressant that can treat angina.

67
Q

describe transcranial doppler use during carotid endarterectomy

A

monitors for cerebral hyperperfusion and athersclerotic plaque emboli via blood flow of MCA (temporal)

reduction of >50% is indication of shunting while doubling of flow is hyperemia and anes can decrease cerebral perfusion pressure

68
Q

how do EEG and SSEP monitoring correlate with blood flow in carotid endarterectomy

A

EEG can detect regional and global decrease in cerebral blood flow that can lead to intraop stroke

SSEP can detect cortex ischemia

however most strokes from CEA are thromboembolic, not ischemic)

69
Q

describe deep hypothermic circulatory arrest and what is its target temperature and goal duration

A

target temp 15-22C
cooling process over 30-60min
lowers metabolic rate of brain
normal duration is about 30-40min depending on temperature

70
Q

what physiologic changes occur when cross clamping aorta (include arterial and venous)

A

causes increase in catecholamine release which causes venoconstriction, increasing CVP

coronary perfusion increases but cardiac output decreases, increase PAWP and increase blood volume, with increases arterial BP proximal to clamp

decrease perfusion to kidneys

71
Q

how does PA catheter measure CO

A

thermodilution by cold injection at right heart and measure temp at PA

multiple measurements and take average

can be inaccurate during low cardiac state or tricuspid regurgitation

72
Q

how much does atrial kick contribute to left ventricle volume

A

up to 40%

73
Q

what is the target temp for post-arrest hypothermia?

A

32-36C for 12-24hrs

fastest coolling is endovascular cooling which can decrease temp by 4C/hr

rewarm slowly over 24hrs to goal 37C
risks of rewarming include arrhythmias, electrolyte abn, hypotension, GI bleed, infection

74
Q

milrinone mechanism

A

PDE3 inhibitor increasing cAMP and is effective in betablockade!

increases cardiac index without increasing myocardial demand while decreasing SVR, PVR, preload, and afterload by dilating pulm and systemic arteries

needs to be renally adjusted

75
Q

dobutamine mechanism

A

selective B1 agonist, 1st line for dec CO but adequate BP

76
Q

norepinephrine receptor target affinity

A

alpha&raquo_space;>B1>B2

do nto give IM due to risk of ischemia and tissue necrosis (phenylephrine has reduced risk of necrosis)

77
Q

anaphylaxis treatment intraop, what is epi dose for peds vs adults

A

remove offending agent
100% O2
DC anesthetic agents
25cc/kg IVF
epinephrine (peds = 1mcg/kg, adults = 50-100mcg IV)

Anesthesia (11 decks)

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