Anesthesia Interview Questions Flashcards
What is the difference between hypoxia and hypoxemia
Hypoxemia is the decrease in partial pressure of oxygen in the blood ⬇️PaO2 which will result in hypoxia.
Hypoxia is the reduce level of tissue oxygenation.
What is the normal value and how to calculate?
CO ( cardiac output)
HR x SV/1000
4.0 – 8.0 l/min
What is the normal value and how to calculate?
MAP( mean arterial pressure)
MAP = SBP + 2 (DBP)
3
Another way to calculate the MAP is to first calculate the pulse pressure (subtract the DBP from the SBP) and divide that by 3, then add the DBP:
MAP = 1/3 (SBP – DBP) + DBP
MAP goal>65
What is the normal value and how to calculate?
SVR (Systemic Vascular Resistance) to
80 x (MAP – RAP)/CO
800 – 1200 dynes · sec/cm5
What is the normal value and how to calculate?
PVR (Pulmonary Vascular Resistance)
80 x (MPAP – PAWP)/CO
< 250 dynes · sec/cm5
What is the normal value and how to calculate?
Cardiac Index (CI)
CO/BSA
2.5 – 4.0 l/min/m2
What is the normal value and how to calculate?
Coronary Artery Perfusion Pressure (CPP)
Diastolic BP – PAWP
60 – 80 mmHg
What is preload?
The amount of ventricular stretch at the end of diastole (LVeDP)
What is afterload?
The amount of resistance the heart most overcome to open the Arotic Valve and push blood out the LV into the systemic circulation (SVR)
What does contractilty mean?
Contractility is the strength of the heart ❤️ ❤️
What is the normal value and how to calculate?
SV (Stroke Volume)
CO/HR x 1000
60 – 100 ml/beat
What makes up SV (Stroke Volume)?
Preload
Afterload
Contractility
Cranial Nerve I
👃
(OH)
Olfactory (smell) 👃
Sensory
Cranial Nerve II
👁👁
(OH)
Optic nerve (vision) 👁👁
Sensory
Cranial Nerve III
👀 👁👁 🙄
(OH)
Oculomotor Nerve
eye movement & raising eyelids 🥸
Cranial Nerve (IV)
🙄🥺
(TO)
Trochlear
(eye movement up 🙄⬆️ and down 🥺⬇️)
Motor
Cranial Nerve V
🧏🏽♀️🧏🏿🧏🏼♂️🤧😪 😋
(TOUCH)
Trigeminal Nerve
(sensation to face🥵🥶, mucus membrane 😪and chewing)
Both
Cranial Nerve VI
👀🙄
(AND)
Abducen Nerve
(lateral eye movement 👀👀& outward gaze🙄)
Motor
Cranial Nerve VII
😜😉😀 👅🥲
(FEEL)
Facial Nerve
(facial expressions 😜🤪😆, taste👅 , and secretion gland😭😢🥲)
Both
Cranial Nerve VIII
👂
(VERY)
Vestibulocochlear Nerve (Hearing 🦻)
Sensory
Cranial Nerve IX
😝🤤 👅
(GOOD)
Glossopharyngeal Nerve (Swallowing,Salivation and taste 👅)
Sensory
Cranial Nerve X
🫁
(Velvet)
Vagus Nerve
(Diaphragm movement🫁& parasympathetic supply to visceral organs)
Both
Cranial Nerve XI
🗣👥💁🏽
(such A)
Accessory Nerve
(speech🗣, shoulder💁🏽 and head movement 👥)
Motor
Cranial Nerve XII
😋👅😝😛🤑🤑👻🐍
(HEAVEN)
Hypoglossal Nerve (tongue movement)😋😝😛👅👻
What is the normal value and how to calculate
Cerebral Perfusion Pressure (CPP)
Pressure in cranial department
MAP-ICP=CPP
60-80mmHg
⬆️BP —>⬆️CPP (worsening brain 🧠 edema)
⬇️BP—>⬆️ICP=⬇️CPP (blood flow to brain)
What is the normal value and how to calculate ?
Coronary Artery Perfusion Pressure (CPP)
Difference between the diastolic pressure and left ventricle end diastolic pressure
DBP-LeDP-CPP
60 – 80 mmHg
What atmosphere pressure at sea level?
760mmHg
What is protamine sulfate made of?
Sperm of salmon 🍣
What makes up Cryo?
Cryo is prepared from plasma and contains:Fibrinogen, factor 8 & 12 and Von Williebrand
What is Desmopressin (DDaVP)?
Vasopressin (antidiuretic) that induce the release of factor 8 and Von Willebrand from the endothelial cells
What is the indication for Protamine
Heparin reversal
What will be the indication to give FFP?
Bleeding, vitamin K deficiency, DIC
What are the drugs that can be given via ETT
N- naloxone
A- atropine
V- vasopressin
E- epi
L- lidocaine
What is the proper dosing when giving medication down ET tube?
And the recommended dose saying 2 to 2 1/2 times the IV dose
Dilute 5 to 10 ML sterile water or normal Sailing into the ET tube followed by bag valve ventilation
What are the pain receptors?
- Mu
- Kappa
- Delta
- nociception
- zeta
What is Mu -1 receptor responsible for?
The mu-1 receptor is responsible for analgesia and dependence.
What is Mu-2 responsible for?
The mu-2 receptor is vital for euphoria, dependence, respiratory depression, miosis, decreased digestive tract motility/constipation
What is Mu-3 responsible for?
Mu-3 receptor causes vasodilation
How many Mu
3
Where is M you found?
Primarily in the brainstem 🧠 the medial thalamus (supra spinal)
Where is kappa receptors found?
Found primarily in the limbic, brainstem spinal cord and dienaphic area
What are Kappa receptor responsible for?
They provide analgesia, diuresis, and dysphoria.
Where is the Delta receptor located
🧠 brain
What are Delta receptor responsible for?
They play a role in analgesia and reduction in gastric motility.
What is vitamin K depending clotting factors?
Factor 2, 7,9,10, protein C & S
How long does vitamin K take before it’s therapeutic?
24hrs
What medication would vitamin K reverse?
To reverse warfarin(Coumadin)
How do you monitor heparin?
aPTT
Normal aPTT?
Normal:30-40 sec
What is the therapeutic level for aPTT when a person is on a heparin drip?
Therapeutic:15-25 sec
What is the antidote for heparin?
Protamine Sulfate
What is heparin induced thrombocytopenia (HIT)?
⬇️ PLT it worsen clot
What does heparin inhibits?
Inhibit thrombin conversion to fibrinogen -> fibrin
What lab value is used to measure Coumadin level?
PT/INR
What is the normal PT/INR level?
Normal: 0.75-1.25 sec
What is the therapeutic PT/INR level for a person who is on Coumadin?
Therapeutic level: 2-3 sec
What should you not eat or drink when you are on Coumadin?
Green leafy vegetable.
No alcohol
What pain receptor does morphine and fentanyl work on?
Mu receptor
How much more potent fentanyl is then morphine?
50-100 times more
Which pain receptor provide spinal allergies it and which provides supra spinal anesthesia?
Mu: supra-spinal
Kappa: spinal
Delta: spinal
What is the reversal for narcotics? What is the proper dosage?
Narcan: 0.4-2mg (IV/IM/SC) repeat q 2-3min
NOT EXCEED 10mg (0.01mg/kg)
What is the reversal drug for benzodiazepine?
Flumazenil: 0.2mg IV 15-30 sec
MAX DOSE 3mg/hr
What are the different vent settings?
https://rebelem.com/wp-content/uploads/2018/09/Mechanical-Ventilation-Modes-1-1024x755.png
What are the percentage of O2 on RA?
21%
What is the percentage of oxygen in 1 L NC?
24%
How do you calculate a percentage of oxygen at 2 L, 3 L, 4L…etc?
2L add 4 = 28%
3L add 4 = 32%
4L add 4 = 36%
5L add 4 = 40
6L add 4 = 44%
What is the percentage of oxygen in a nonrebreather mask?
Nonrebreather mask:10-15L (60-90%)
What percentage of oxygen is given in simple face mask?
6-15L (35-55%)
What is the difference between an LMA and ETT?
An LMA does not manipulate the Gladys or the trachea like an ETT
How does a pulse ox work?
The pulse oximeter operates on the principle of absorption of light by the solutes in a solution. The Beer-Lambert law states that the amount of light absorbed by a solute is proportional to the concentration of the solute and the distance the light is transmitted through the solution.
What does NPH stands for in insulin?
NPH (neutral protamine hagedorn) insulin lowers blood glucose within 1 to 2 hours after administration and exerts a peak effect at 6 to 10 hours.
What makes up a bag of Zosyn?
ZOSYN is a combination product consisting of a penicillin-class antibacterial, piperacillin, and a beta-lactamase inhibitor, tazobactam.
indicated for the treatment of patients with moderate to severe infections caused by susceptible isolates of the designated bacteria in the condition.
What is the difference between NS and LR?
They are both isotonic solutions which is similar to the body osmotic pressure. They both are crystalloids. This means that they have small molecules that can easily flow through membranes, such as the cell membranes in your body’s tissues.
The differences in particles mean that LR doesn't last as long in the body as NS does. Lactated ringers contain: Sodium chloride Sodium lactate Potassium chloride Calcium chloride dihydrate Water for injection
What is the normal blood flow through the heart?
Deoxygenated blood enters the inferior or superior vena cava or coronary sinus and ➡️enters the right atrium blood ⬇️
passes through the tricuspid valve
and enters right ventricle blood moves ➡️through the pulmonic valve and enters the pulmonary arteries were blood is carried to the lungs 🫁
the lungs blow off CO2 and picks up O2 into the blood in the pulmonary capillaries from there the oxygenated blood enter the pulmonary veins from the vein blood 🩸 enter the left atrium ➡️ passes through the mitral valve to enter the left ventricle, the left ventricle contract moving blood through the aortic valve into the aorta and to the systemic arteries and system
What does inotropic drugs do?
⬆️ contractility
What are the effects of chronotropic agents?
⬆️ or ⬇️ heart rate and rhythm by affecting rhythm produced by SA node
What are the two types of chronotropic?
Positive chronotropes ⬆️ increase heart rate. ex: Atropine, milrinone, theophylline
negative chronotropes ⬇️ decrease heart rate.
ex: digoxin, metoprolol, acetylcholine
What effect does dromotropic agents?
affects the conduction speed (in fact the magnitude of delay) in the AV node, and subsequently the rate of electrical impulses in the heart.
Positive dromotropy increases conduction speed (e.g. epinephrine stimulation) ex: phenytoin
negative dromotropy decreases stimulation(e.g. vagal stimulation) ex:verapamil
What are the receptors associated with sympathetic nervous system?
Alpha: smooth muscle contraction and vasoconstriction (andrenergic receptor)
Beta1: ❤️ heart. Beta 2: 🫁 lungs (adrenergic receptor)
Dopa: renal,splenic, coronary and brain
Causes vasodilation
Dopamine effects on CO?
⬆️ HR
⬆️ preload
⬆️ afterload
☑️ vasopressor effects
⬆️ contractility
Beta1 receptor or alpha depends on dose
Epi effects on CO ?
⬆️ HR
⬆️ preload
⬆️ afterload
☑️ vasopressor effects
⬆️ contractility
Alpha & beta receptors
Dobutamin effects on CO ?
Slight ⬆️ HR
Slight vasodilator
⬆️ contractility
Norepinephrine effects on CO ?
⬆️ HR
⬆️ preload
⬆️ afterload
☑️ vasopressor effects
⬆️ contractility
Alpha 1 some beta receptor
Phenylephrine effects on CO ?
Slight ⬆️ HR
⬆️ preload
⬆️ afterload
☑️ vasopressor effect
⬆️ contractility
Alpha receptor only
Vasopressin effects on CO ?
Slight ⬆️ HR
⬆️ preload
⬆️ afterload
☑️ vasopressor effect
Milrinone effects on CO ?
Slight ⬆️ HR
Slight ⬆️ preload
Slight ⬇️ afterload
Slight vasodilator
⬆️ contractility
PDE 3 receptor (Phosphodiesterase 3)
Nitroglycerin effects on CO?
⬇️ preload
⬇️ afterload
☑️ vasodilator
Digoxin effects on CO?
⬇️ HR
⬆️ contractility
Nipride effects on CO?
⬇️ preload
⬇️ afterload
☑️ vasodilator
Calcium chloride effects on CO?
⬆️ contractility
Amiodarone effects on CO?
⬇️HR
Beta Blocker effects on CO!
⬇️ HR
⬇️ then ⬆️ preload
⬇️ afterload
☑️ vasodilator
⬇️ contractility
Ace Inhibitors effects on CO?
⬇️ preload
⬇️ afterload
☑️ vasodilator
Nicardipine effects on CO?
⬇️ then ⬆️ preload
⬇️ afterload
☑️ vasodilator
⬇️ contractility
Dopamine concentration and dosage?
Concentration: 4mg/250
Dosage: 2-20mcq/mcq/min
Epi for concentration and dosage?
Concentration: 2mg/250
Dosage: 0.05mcq-5mcq
1-10mcq
Dobutamin concentration and dosage?
Concentration : 500mg/250ml
Dosage: 2.5 mcq-20mcq/kg/min
Norepinephrine concentration and dosage?
Concentration: 4mg/250
Dosage: 0.5-30mg/min
0.01mcq-3mcq/kg/min
Phenylephrine concentration and dosage?
Concentration: 40mg/250
Dosage: 50-200mcq/min
Vasopressin concentration and dosage?
Concentration: 20units/100
Dosage: 0.02-0.04u/min
Nitroglycerin concentration and dosage?
Concentration: 50mg/250
Dosage: 5mcq-20mcq
Amiodarone concentration and dosage?
Concentration:150mg/100 over 10 mins
Infusion: 360mg/100
1mg/hr for 6hrs than ⬇️ 0.5mg /hr for 18hrs
Digoxin dosage?
Dosage:0.0625mg- 0.25mg