OpenAnesthesia Flashcards
pump flow range
1.6-3 L/min/m2
CPB mixed venous goals
SvO2 >65%
CPB glucose
aggressive (80-110 mg/dL) management ass with worse outcomes
meds to avoid with reproductive assistance, why?
droperidol and metoclopramide; both can increase prolactin levels, which can follicle maturation and corpus function
LMWH clearance
renally - prolonged in renal insufficiency, directly proportional to creatinine clearance
how to monitor enoxaparin
PTT is not usually monitored, can test anti-Xa activity (peak at 4 hours), therapeutic for tx 0.6-1.0 U/ml and ppx 0.1-0.3 U/ml
uterine atony risk factors
oxytocin, multiples, polyhydramnios, chorioamnionitis (NSAIDs irreversibly inhibit platelet function but little affect on uterine tone)
TRALI mechanism
GVHD - leukocytes/neutrophils causing flood of neutrophils and inflammatory mediators to lungs causing increased microvasc permeability
Haldane effect
Deoxygenated blood can carry increasing amounts of carbon dioxide
Bohr effect
an increase of carbon dioxide in the blood and a decrease in pH results in a reduction of the affinity of hemoglobin for oxygen
IgA deficiency considerations
blood products need to be washed before administration
cryo contains
VIII (100 IU), vWF, XIII, and fibrinogen (250 mg)
type
patient’s RBCs mixed with serum with known antigens (ABOD)
screen
(indirect) put patients serum with RBCs with known antigens
crossmatch
patient’s serum with donor cells
therapeutic hypothermia
32-34 for 24 hours
emergent therapy for stroke 2/2 air embolism
hyperbaric O2
HBO uses
arterial air embolism, CO poisoning, decompression sickness, severe anemia, hypoperfusion, gas gangrene
HBO MAC effects
decrease in MAC because HBO increases partial pressure of volatiles at higher barometric pressure and gas density increases so rotameter flowmeters will read falsely high (2% sevo at 1 atm produces same as 0.66% sevo at 3 atm)
1 mm Hg CO2 decrease - CBF?
decreases 3-4%, goal 30-35
goal CPP with increased ICP
60-70 mm Hg
prevention of contrast nephropathy
periprocedural continuous hemofiltration, oral N-acetylcysteine, bicarbonate infusion
predisposition to renal damage with contrast
Cr >1.5, GFR < 60, DM nephropathy, hypovolemia, high dose contrast media, multiple myeloma
pierre robin ass syndromes
stickler syndrome, velocardiofacial syndrome, treacher-collins
pierre robin characteristics
micrognathia, glossoptosis (prone position may help), airway obstruction –> can cause cor pulmonale, can also see cleft palate, high incidence of central/obstructive apnea
congenital lobar emphysema management
inhalational induction, spontaneous ventilation preferred, single lung ventilation, nitrous contraindicated
congenital lobar emphysema characteristics
causes hyperinflation of lungs, resp distress in newborn-6 mos, left lung more common, left upper lobe most common,
congenital lobar emphysema physical exam
decreased breath sounds, hyper-resonant, hyperinflation on CXR
CPB roller pump
roller pump flow is predictable and depends on revolutions per minute of the pump, retrograde flow is not possible, but if there is outflow occlusion, pressure can build and cause tubing rupture or separation
CPB centrifugal pump
retrograde flow is possible, flow depends on pressure differential created by the spinning cones –> cause negative pressure that propels fluid forward, flow varies with afterload an preload
roller pump vs centrifugal
roller has predictable speed and cost less
best echo view for ischemia
transgastric mid-papillary short axis
fluconazole active against
candida, Cryptococcus, coccoidioides immitis
needed for nitrogen balance calculations
nitrogen intake, 24 hour urine nitrogen, 24 hour change in BUN (very sick usually have negative nitrogen balance)
PNA diagnosis from BAL
10,000 colonies, 1,000,000 for endotracheal aspirates, 1,000 for protected brush specimen
hyperkalemia treatment
hyperventilation, gluscose/insulin, beta agonist, lasix, dialysis, aldosterone agonist
nitroglycerin
much more potent venodilator than arterial dilator
hydralazine metabolism
metabolized by acetylation in the liver
synchronized cardioversion
shock synchronized with QRS to avoid shock during refractory period (R on T)
smoking cessation 48-72 hours
increased secretion, more reactive airway activity, decreased carboxyhgb, improved oxygentation
smoking cessation 2-4 weeks? 8 weeks?
decreased secretions, decreased airway reactivity; decreased overall post-op morbidity and mortality
MS management
sensitive/insensitive to NMBD, suc may cause hyperkalemia, hyperthermia may cause exacerbations, neuraxial not recommended?, MAC may be reduced
MS
autoimmune disease of inflammation, demyelination, and axonal damage to CNS, tx with corticosteroids, methotrexate, azathioprine, glatiramer acetate, interferon-beta
autonomic hyperreflexia
HTN followed by profound vagal response (brady), may see vasodilation and flushing above injury (2/2 high afterload)
layers for paramedian neuraxial
skin, sub Q fat, paraspinal muscles, ligamentum flavum, dura mater, subdural space, arachnoid mater, subarachnoid space
DMD heart changes
dilated CM from fatty infiltration, prominent Q waves, inverted T waves, cardiac involvement seen in 90% patients, can lead to LV failure and sudden death (ACE-I and bb)
DMD presentation
most severe MD, 3-5 years start, waddling gait, progressive falls, difficulty with stairs, gower (both hands to get up from seated position)
becker’s dystrophy
problem with dystrophin results in leaking muscle membranes and elevation of CPK, pseudohypertrophy of muscles from fibrofatty infiltrates
LA absorption
ICE-BS intercostal, caudal, epidural, brachial, sciatic/femoral
gasserian ganglion
formed from 3 divisions of trigeminal nerve, trigeminal nerve root emerges from here and travels to its nucleus in the pons
trigeminal neuralgia cause
irritation of nerve root by blood vessel (superior cerebellar artery), MS, tumor, trauma
trigeminal neuralgia treatment
carbamezapine (tegretol), oxycarbemezapine (trileptal), phenytoin, baclofen, gabapentin, microvascular decompress, nerve lesions, motor cortex stim
carbamezapine and phenytoin side effects
hyponatremia, agranulocytosis, hepatic toxicity; gingival hyperplasia
WHO analgesic ladder
- non-opioid w/wo adjuvants 2. weak opioids w/wo adj 3. strong opioids w/wo adj
acute hemolytic reaction
can occur 3-21 days after transfusion, elevated unconjugated bili, back pain, fever, SOB, chest pain, pain at sight of infusion, HA, change in vitals, pulm edema, bleeding, renal failure
febrile transfusion reaction
0.5% RBC transfusions, 30% platelet transfusions, see increase > 1 degree C, HA, chills, back pain, may take 2 hours to develop
febrile transfusion reaction treatment
stop transfusion (may be hemolytic), acetaminophen, diphenhydramine, leukoreduced transfusions in the future and premed with acetaminophen
LVAD contraindications
PFO/ASD, AI, MS (tends to improve MR)
acute hemorrhage and resus, which factor is first to reach critical low
fibrinogen
can fibrillating atrium be paced
no
Pacemaker
Paced, Sensed, Response to sensed event, Rate modulation, Multisite pacing
highest risk for abnormal placentation
placenta previa (increased maternal age, C-sections)
bronchial blocker disadvantage
higher cost, not able to add CPAP or suction operative lung
missed musculocutaneous on ax block
maintain biceps motor, elbow flexion and supination, sensation to lateral forearm
tibial nerve stim
innervates gastroc and soleus muscles of calf - controls plantar flexion of toes and ankle
2-chloroprocaine epidural use
associated with decreased efficacy of subsequent epidural opioids because it antagonizes mu and kappa opioid receptors (onset 6-12 min, peak 10-20, duration 30-60 min)
2-chloroprocaine epidural use
associated with decreased efficacy of subsequent epidural opioids
SC stimulator procedure management
can be extensive dissection and awake has lower fail rate; can use spinal, LA with conscious sedation, thoracic epidural (single shot)
spinal cord stim
send pulsed electrical signals to spinal cord to control chronic pain, stim electrodes are placed in epidural space, generator in lower abd or gluteal region, and generator remote
spinal cord stim indications
failed back surgery syndrome, refractory angina pectoris, PVD, CRPS I
failed back surgery syndrome
40% of patients s/p spinal surgery
refractory angina pectoris
angina caused by CAD not controlled with meds, surgery, etc –> treat with SCS decrease chest pain, hospital admission, increase exercise duration, less morbidity than other open procedures for pain
SCS for PVD
when PVD is inoperable –> improves quality of life, limb mobility, pain relief
AMS differential diagnosis post craniotomy
hemorrhage, tension pneumocephalus, venous/arterial stroke, hydrocephalus, infection, seizures, metabolic, retraction/surgical injury
CBF, slowing, flat EEG
50ml/100g/min (15% CO), 20, 12
CMRO2
3ml/100g/min
PaCO2 and CBF/CBV
decrease CBF 1-1.5 and CBV 0.05
cerebral vasospasm treatment
hypertensive euvolemia (HTN, hypervolemia, hemodilution), nimodipine, balloon angioplasty, papaverine/verapamil intraterial injection (vasodilators)
cerebral vasospasm presentation and detection
3-10 s/p SAH (think hydrocephalus, seizure, hyponatremia, rebleed), use cerebral angiography, transcranial Doppler (increased arterial velocity
vasospasm prevention
nimodipine, remove subarachnoid blood ASAP, instill thrombolytics (urokinase), antinflam (NSAIDs/steroids)
AAA repair renal problems
see ATN, decrease chance with good intravascular volume and heart function
AAA crossclamp complications (increase)
increased wall motion abn, increased wedge and CVP, increased coronary blood flow, increased mixed venous, increased epi/norepi, renal vasc resistance
AAA crossclamp complications (decrease)
decreased CO, EF, RBF, CO2 production, renal cortical blood flow, GFR
intralipid dose
1.5ml/kg bolus and 0.25 ml/kg/min infusion