Holliday Flashcards
The biggest absolute contraindication to surgery
DKA or diabetic coma
-blood sugars sky high, too many complications, infections, etc…
quantitative signs of poor nutrition, relative contraindications to surgery, eg delay if not emergent
alb v3
20% weight loss 3 mos
prealbumin/transferrin v200
ways to rescuscitate nutrition in order of preferability
po
enteral (g tube)
tpn (IV)
quantitative signs of severe liver failure, relatively contraindicating surgery, eg delay if not emergent
bili ^2
PT ^16
ammonia ^150
(or clinical encephalopathy)
how long must stop smoking for non emergent surgery
8 weeks
why is smoking a relative contraindication to surgery
impairs wound healing
especially in plastics… so must quit ^8wks for non-emergent surgery
what to watch out for in smoker waking up from anesthesia
don’t artificially sat O2 too high
in smokers/COPDers, chronic CO2 retainers, hypoxia is last respiratory drive, don’t suppress it by artificially satting too high
what does goldman’s index do and what are the most important factors
assesses cardiac risk of surgery
CHF (EF v35%) - check w echo
MI (MI v6mos ago) - check w EKG, stress test, cath (angio basically?), revascularize
arrrhythmias, elderly, aortic stenosis (late systolic crescendo decrescendo murmur), emergency surgery, also factors
what to expecially listen for on heart auscultation in preop patient`
late systolic crescendo decrescendo murmur - aortic stenosis
not good for goldman index, cardiac risks for surgery
medications to stop prior to surgery
aspirin (1-2wks prior)
NSAIDS, vitamin E (bleeding issues)
warfarin (want INR v1.5, can use Vit K)
Insulin - take half the morning dose because NPO after midnight
metformin (risk lactic acidosis)
when to get dialysis prior to surgery if CKD
24 hours prior
why do we check BUN and Cr prior to surgery?
uremic platelet dysfunction
BUN ^100 a risk for postop bleeding
numbers if preop patient at risk for uremic platelet dysfunction and postop bleed risk
BUN ^100
normal platelet count
prolonged bleeding time
Vent settings to know in SICU
Assist-Control - set TV and RR, if pt takes breath on their own the vent still gives the same TV… aka vent supports every breath whether pt or vent initiated… not good if pt tachypnic
Pressure Support - pt RR but boost of pressure (8-20) from vent, *important in weaning
CPAP - pt RR and TV but vent pressure all the time to keep alveoli open
PEEP - pressure given (5-20) at end of cycle to keep alveoli open *used in ARDS and CHF
vent setting important in ARDS and CHF
PEEP pressure given (5-20) at end of cycle to keep alveoli open
vent setting important in weaning
Pressure Support
pt RR but boost of pressure (8-20) from vent, *important in weaning
routine test to check while pt on vent
ABG
PaO2 PaCO2 pH
pt on vent
PaO2 too low
PaO2 too high
PaCO2 too low, pH is high
PaCO2 too high, pH is low
inc FiO2 dec FiO2 (free radical damage can worsen ARDS)
dec TV more than RR
inc TV more than RR
(TV multiplicative, also, changes ventilation of functional space only, whereas RR changes ventilation of dead space as well… but consider adjusting RR if lung perf or something a concern… i think…)
adjust minute ventilation
RR or TV
MV = RR x TV
adjust vent for PaCO2 and pH off balance
PaCO2 too low, pH is high
-dec TV (preferred to dec RR because more bang for buck, no dead space involvement)
PaCO2 too high, pH is low
-inc TV (preferred to inc RR)
Which is more efficient, adjusting TV or RR?
TV, changes functional ventilation only
while RR involves dead space as well as functional volume
Approach to acidosis
pH v7.4
check HCO3 and pCO2
-if both high, respiratory acidosis
-if both low, metabolic acidosis
check anion gap (Na - Cl - HCO3… 8-12 wnl) if metabolic
- GAP metabolic acidosis MUDPILES methanol uremia dka polyetheleneglycol/peraldehyde isoniazid lactate ethanol/etheleneglycol salicylates
- NONGAP metabolic acidosis Diarrhea, Renal Tubular Acidoses, abuse of Diuretics
MUDPLES
for anion gap (Na - Cl - HCO3 = ^12) metabolic acidosis
methanol uremia dka polyetheleneglycol/peraldehyde isoniazid lactate salicylates
non-gap metabolic acidosis etiologies
diarrhea - pooping out anions (HCO3…)
renal tubular acidoses
abuse of diuretics