from UT review Flashcards
what is an absolute contraindication for surgery? why?
DKA/diabetic coma/skyhigh glucose– bc risk of ifxn is too high
what are three indicators of poor nutritional status that would make you want to delay surgery?
albumin 20%, transferrin
what are three indicators of poor nutritional status that would make you want to delay?
albumin 20%, transferrin
what are indicators of liver failure that would make someone want to delay surgery
bilirubin >2, PT > 16 (coags = imp before surgery!), ammonia > 150, clinical signs of encephalopathy
what are indicators of liver failure that would make someone want to delay surgery
bilirubin >2, PT (coags = imp before surgery!), ammonia > 150, encephalopathy
when should you recommend smokers stop smoking prior to surgery?
8 wks
what does Goldman’s Index do?
tells you who is at greatest risk from surgery
what is the most important factor in Goldman’s index (tells you who’s at greatest risk from surgery)
CHF– greatest factor for periop death
what is the most important factor in Goldman’s index (tells you greates risk for surgery)
CHF– greatest factor for periop death
How do you check if someone has CHF before surg?
ejection fraction. if
What are first 6 criteria for Goldman’s index (tells you who’s at greatest risk for surgery)
- CHF
- MI w/in 6 mo (surrogate for CV status)
- arrhythmia
- Old (>70 yo)
- Surgery is emergent
- AS (Aortic stenosis), poor medical condition, surgery in chest/abd
what are you checking on pt >50 or Pt w/recent MI (w/in 6 mo)
EKG - if abnormal —> stress test, if abnormal —> cardiac cath —> reperfusion with stenting or revasc w/CABG
what else should be checked before surg related to AS (aortic stenosis)
- Listen for murmur– late systolic- systolic ejection murmur, crescendo-decrescendo murmur that radiates to carotids. Increase w/squatting, decrease with decr preload
MEDS to STOP before surgery
7-10 days ahead, preferably 2 wks: Aspirin, NSAIDS, Vitamin E (affects coags)
5 days: warfarin
metformin- lactic acidosis
what should your INR be before operating?
how should insulin dependent pts take their insulin before surg?
1/2 nl dose in morning because NPO after midnight the night before
pts w/CKD on dialysis need to be dialized when?
24 hrs before
why do we check BUN and Cr before surgery i people with CKD
bc increased risk of bleeding due to uremic toxins –> uremic platelet dysfunc, especially if BUN > 100
what would you see in the labs if someone was bleeding due to uremic platelet dysfunc?
pt with CKD, BUN > 100, nl platelets but increased bleeding time
what is pressure support vent?
pt rules rate but a boost of pressure is given (8-20) to help give Tidal Volume
what is pressure support vent?
pt rules rate but a boost of pressure is given (8-20)
what is CPAP?
cont. positive airway pressure– pt must breathe on own (must have sufficient resp drive) but + pressure given all the time to keep alvioli open
what is CPAP?
cont. positive airway pressure– pt must breathe on own but + pressure given all the time
What is PEEP?
Positive end expiratory pressure– given at end of cycle to keep alveoli open (5-20)
what is the best test to evaluate management of pt on vent?
ABG– check pa02 and paCO2
what is the best test to evaluate management of pt on vent?
ABG
If person is on a vent and ABG shows Pa02 is high, you should…
lower Fi02– bc free radicals can form–> increase damage
If person is on a vent and ABG shows Pa02 is high, you should…
lower Fi02
If person is on a vent and ABG shows PaC02 is high (pH is low), you should…
increase rate or TV
which is a more eficient change? rate or TV?
TV is a more efficient change– bc increased rate = increased deadspace (Minute ventilation equation)
steps to checking type of acidosis
- check pH–> respiratory acidosis
– if HC03 is low and PaCO2 is low —> metabolic acidosis –> metabolic acidosis - Check AG (Na- [Cl+HCO3])
– nl = 8-12
Gap: MUDPILES
steps to checking type of alkalosis
- check pH –> if > 7.4 = alkalotic
- check bicarb and paC02
- - if HCO3 = low, and paC02 = low —> respiratory alkalosis
- - if HCO3 = high and paCO2 = high –> metabolic alkalosis - Check urine Cl
- - if [Cl] = less than 20 –> vomiting/NG, antacids, diuretics
- - if [Cl] > 20 –> Conn’s, Bartter’s Gittleman’s
steps to checking type of alkalosis
- check pH –> if > 7.4 = alkalotic
- check bicarb and paC02
- - if HCO3 = low, and paC02 = low —> respiratory alkalosis
- - if HCO3 = high and paCO2 = high –> metabolic alkalosis - Check urine Cl
- - if [Cl] = less than 20 –> vomiting/NG, antacids, diuretics
- - if [Cl] > 20 –> Conn’s, Bartter’s Gittleman’s
what are three indicators of poor nutritional status that would make you want to delay?
albumin 20%, transferrin
how would you maximize someone’s nutrition?
enteral feedings (NOT TPN!)
what are indicators of liver failure that would make someone want to delay surgery
bilirubin >2, PT (coags = imp before surgery!), ammonia > 150, encephalopathy
what are common causes hyperchloremic (>20) metabolic alkalosis?
Conn’s (hyper aldo) & Bartter’s, Gittleman’s
If smoker, what should you watch post-op as waking up from anesthesia?
O2 sat– don’t go to 100 bc used to retaining C02, need signal to breathe (possible BS per schwarzstein)
what are common causes of metabolic acidosis?
MUDPILES Methanol uremia DKA Propylene glycol isoniazide lactic acidosis (MOST COMMON) ethylene glycol salicylates
Causes of Non gap metabolic acidosis
diarrhea (pooping out bicarb –> metabolic acidosis), diuretics, renal tubular acidoses (RTAs) (I
How do you check if someone has CHF before surg?
ejection fraction. if
What are first 6 criteria for Goldman’s index (tells you who’s at greatest risk for surgery)
- CHF
- MI w/in 6 mo (surrogate for CV status)
- arrhythmia
- Old (>70 yo)
- Surgery is emergent
- AS (Aortic stenosis), poor medical condition, surgery in chest/abd
what are you checking on pt >50 or Pt w/recent MI (w/in 6 mo)
EKG - if abnormal —> stress test, if abnormal —> cardiac cath —> reperfusion with stenting or revasc w/CABG
what else should be checked before surg related to AS (aortic stenosis)
- Listen for murmur– late systolic- systolic ejection murmur, crescendo-decrescendo murmur that radiates to carotids. Increase w/squatting, decrease with decr preload
MEDS to STOP before surgery
7-10 days ahead, preferably 2 wks: Aspirin, NSAIDS, Vitamin E (affects coags)
5 days: warfarin
metformin- lactic acidosis
what should your INR be before operating?
how should insulin dependent pts take their insulin before surg?
1/2 nl dose in morning because NPO after midnight the night before
pts w/CKD on dialysis need to be dialized when?
24 hrs before
why do we check BUN and Cr before surgery i people with CKD
bc increased risk of bleeding due to uremic toxins –> uremic platelet dysfunc, especially if BUN > 100
what would you see in the labs if someone was bleeding due to uremic platelet dysfunc?
pt with CKD, BUN > 100, nl platelets but increased bleeding time
what is an assist control vent?
set TV & rate, but if pt takes a breath, vent gives the volume
what is pressure support vent?
pt rules rate but a boost of pressure is given (8-20)
when is pressure support vent particularly important?
imp for weaning
what is CPAP?
cont. positive airway pressure– pt must breathe on own but + pressure given all the time
What is PEEP?
Positive end expiratory pressure– given at end of cycle to keep alveoli open (5-20)
when is PEEP used most often?
ARDS and CHF
what is the best test to evaluate management of pt on vent?
ABG
how do you treat hypokalemia (Paralysis, ST depression, U waves happens)?
Give K (but don’t forget to moniter renal func!!! can become hyperkalemic quickly), max 40 mEq/hr
Peaked T waves, prolonged PR and QRS, sine waves = assoc w/which electrolyte derangement?
increased K
Txt for hyperkalemia (Peaked T waves, prolonged PR and QRS, sine waves)
Give Ca-gluconate then insulin + glucose, kayexalate, albuterol (B-agonist) and Na-bicarb. Last resort: dialysis!
In pt when ca is too high or too low, what is next best step?
EKG– look at QT interval, assess risk for torsades
which is a more eficient change? rate or TV?
TV isa more efficient change– bc increased rate = increased deadspace (Minute ventilation equation)
steps to checking type of acidosis
- check pH–> respiratory acidosis
– if HC03 is low and PaCO2 is low —> metabolic acidosis –> metabolic acidosis - Check AG (Na- [Cl+HCO3])
– nl = 8-12
Gap: MUDPILES
steps to checking type of alkalosis
- check pH –> if > 7.4 = alkalotic
- check bicarb and paC02
- - if HCO3 = low, and paC02 = low —> respiratory alkalosis
- - if HCO3 = high and paCO2 = high –> metabolic alkalosis - Check urine Cl
- - if [Cl] = less than 20 –> vomiting/NG, antacids, diuretics
- - if [Cl] > 20 –> Conn’s, Bartter’s Gittleman’s
If pH
-> respiratory acidosis (with metabolic comp)
what are risks of TPN?
acalculus cholecystitis, hyperglycemia, liver dysfxn, zinc deficiency, other ‘lyte probs
if pH > 7.4 = & if HCO3 = high and paCO2 = high what is the acid/base status?
–> metabolic alkalosis
If pH
metabolic acidosis w/resp comp
what are common causes hyperchloremic (>20) metabolic alkalosis?
Conn’s & Bartter’s Gittleman’s
what are common causes of hypochloremic (
vomiting, NG tube, antacids, diuretics
what are common causes of metabolic acidosis?
MUDPILES Methanol uremia DKA Propylene glycol isoniazide lactic acidosis ethylene glycol salicylates
Non gap metabolic acidosis
diarrhea, diuretics, renal tubular acidoses (RTAs) (I
Pt comes in w/confusion, HA, cherry red skin– what are you concerned with? what test should you run? what is the txt?
CO poisoning, test carboxyhemoglobin (pulse ox is worthless because left ward shift- 02 doesn’t dissoc from Hgb). Txt w/100% O2 (hyperbaric if CO-Hb is really elevated!)
what do you do w/hyponatremia…
- check plasma osms– make sure it’s real (not high glucose)
- check volume status
If you see clotting in a person w/edema, HTN & foamy pee think…
nephrotic syndrome (losing prots in urine– some of the first to go are things like antithrombin III and other anti-clotting prots)
suspected diagnoses for hypovolemia (tachy, dry mucus memb, tenting) w/ hyponatremia?
diuretics, vomiting + free water consumption
what’s special about ATIII deficiency as surgery students?
Heparin won’t work– can’t give it to them!
If you see clotting in a young woman w/multiple spontaneous Abortions, think…
Lupus anticoagulant
If you see clotting in someone who’s post-op & decreased plts and heparin was started w/in 5-14 days, think…
HIT (heparin induced thrombocytopenia)– sometimes they won’t say they gave them heparin, they’ll just say they’re “post-op”- code for given heparin! But if it’s low platelets + clotting + post-op THINK HIT!
what do you treat HIT (heparin induced thrombocytopenia) with? (Ab to heparin bound to PF4)
Leparudin or agatroban (synthetic heparin)–
if a pt is BLEEDING with an isolated decrease in platelets, think…
ITP (idiopathic thrombocytopenic purpura)
if a pt is BLEEDING w/normal platelets but increased bleeding time and PTT think…
vWD (Von Willebrand’s Disease)– problem with platelet function, not number
if pt is bleeding with low platelets, increased PT, PTT bleeding time, low fibrinogen and high Ddimer and schistocytes, think…
DIC- caused by gram - sepsis (LPS), disseminated carcinomatosis, OB stuff
how do you treat hypernatremia?
Replace w/D5W or hypotonic fluid
what do you worry about when correcting hypernatremia?
cerebral edema
how quickly can you correct hyper/hyponatremia?
btwn .5 and 1 meq/hr or between 12 & 24 meq/day
numbness, chvostek or troussaeu, prolonged QT interval happens with what electrolyte derangement?
decreased Ca
stones, bones, groans, psychotic overtones and shortened QT interval happens with what electrolyte derangement?
increased Ca
Burn pts are very susceptible to ifxn. how should you give someone abx after a burn?
topically! No PO or IV abx because breeds resistance!!
how do you treat hypokalemia (Paralysis, ST depression, U waves happens)?
Give K (Kidneys!), max 40 mEq/hr
Peaked T waves, prolonged PR and QRS, sine waves = assoc w/which electrolyte derangement?
increased K
Txt for hyperkalemia (Peaked T waves, prolonged PR and QRS, sine waves)
Give Ca-gluconate then insulin + glucose, kayexalate, albuterol and Na-bicarb. Last resort: dialysis!
what should someone do with a chemical burn (esp in eyeballs)?
irrigate > 30 min prior to ER
what is best first step for someone who had an electrical burn?
EKG– arrhythmia is most likely to kill person
if someone w/an electrical burn had LOC or an abnormal EKG, what should you do?
48 hr telemetry
If after a burn a urine dipstick is positive for blood but microscopic exam is negative for RBCs what is going on?
think rhabdo causing myoglobinuria, causing renal failure– (think ATN)
If after a burn a urine dipstick is positive for blood but microscopic exam is negative for RBCs what is going on? and what else should you check?
rhabdo –> myoglobinuria – think ATN. Check K+ – might be too high from cells breaking open
what are risks of TPN?
acalculus cholecystitis, hyperglycemia, liver dysfxn, zinc deficiency, other ‘lyte probs
erythematous, painful but not peeling burn = what degree?
1st degree– effects epidermis
dark or pale burn w/no sensation is what degree burn?
3rd degree, through epidermis and dermis to the nerves
what is the concern w/circumferential burns?
compartment syndrome
loss of integrity of epidermis, very painful burn is what type?
2nd degree
how could you treat a circumferential burn to avoid compartment syndrome?
consider escharotomy
if pt comes in with singed nose hairs, wheezing, soot in mouth/nose, what should you be concerned about
laryngeal edema! Low threshhold for intubation!
if guy is stabbed in the neck and there are crackly sounds w/palmating the anterior neck tissue, what should we do?
fiberoptic broncoscope!! (might have airway.laryngail injury with sub q emphysema)
If guy has huge facial trauma, blood obscures the oral and nasal airway and GCS = 7, what should you do?
cricothyroidotomy (when you can’t asses airway)
If you see clotting in a person w/edema, HTN & foamy pee think…
nephrotic syndrome
if you have intubated a pt and find decreased breath sounds on the left, what happened?
you intubated the rt mainstem broncus– pull out!!
what’s special about ATIII deficiency?
Heparin won’t work
If you see clotting in a young woman w/multiple spontaneous Abortions, think…
Lupus anticoagulant
A pt dies suddenly after a 3rd yr medical student removes a central line. Dx? when else to suspect it?
Dx: air embolism.
Suspect it also when: lung trauma, vent use overzealous w/tidal volume, during heart vessel surgery
what do you treat HIT (heparin induced thrombocytopenia) with?
Leparudin or agatroban
if a pt is bleeding with an isolated decrease in platelets, think…
ITP (idiopathic thrombocytopenic purpura)
what’s next best step if pt is in hemorrhagic/hypovolemic shock (tachy, hypotensive, flat neck veins, nl CVP)
2 large bore periph IV- 2L NS or LR over 20 min followed by blood if we don’t see approp rise in VS
if pt is bleeding with low platelets, increased PT, PTT bleeding time, low fibrinogen and high Ddimer and schistocytes, think…
DIC- caused by gram - sepsis, carcinomatosis, OB stuff
how do you confirm pericardial tamponade?
FAST scan or just treat if strong clinical suspicion
what is the rule of 9s for a child?
head: 19 thorax/abdo: 18 back: 18 each arm front and back: 9 each leg front and back: 14 genitalia: 1
what is the parkland formula for hydration s/p burn in an adult?
Kg x %BSA x 3-4
what is next best step for tension pneumo?
needle decompression, followed by chest tube. Don’t do CXR.
after a burn, what fluid should you use to replenish pts with?
Ringers lactate or NS
what do you see on a Swan-Ganz catheter in hypovolemic shock in terms of RAP/PCWP, SVR and CO?
RAP/PCWP decreases
SVR increases
CO decreases
what topical medication for s/p burns doesn’t penetrate an eschar and can cause leukopenia?
silver sulfadiazine
what topical med for s/p burns penetrates eschar but hurts like hell?
mafenide
what topical burn med doesn’t penetrate eschar and causes hypokalemia and hyponatremia?
silver nitrate
what do you see on Swan-Ganz cath in vasogenic shock in terms of RAP/PCWP, SVR and CO?
RAP/PCWP decreased
SVR decreased
CO increased (EF decreases)
what is best first step for someone who had an electrical burn?
EKG
if someone w/an electrical burn had LOC or an abnormal EKG, what should you do?
48 hr telemetry
If after a burn a urine dipstick is positive for blood but microscopic exam is negative for RBCs what is going on?
myoglobinuria– think ATN
what do you see on Swan-Ganz cath for neurogenic shock in terms of RAP/PCWP, SVR and CO?
RAP/PCWP decreased
SVR decreased
CO increased (EF decreases)
how do you txt neurogenic shock?
in adrenal insuff: txt w/dexamethasone and taper over several weeks
what are the criteria for compartment syndrome?
- 5 P’s: Pain, parasthesia, pallor, paralysis and poikilothermia (inability to regulate temp) and/or pulselessness
- Or compartment Pressure > 30 mmHg
what is the treatment for compartment syndrome s/p burn?
fasciotomy (or escharotomy)– at bedside!
if trauma pt comes in unconscious, what should you do?
intubate!!
if a trauma pt comes in w/a GCS
intubate!!
if a guy is stung by a bee and develops stridor and tripod posturing, what should you do?
intubate!!
if guy is stabbed in the neck, GCS = 15, but there’s an expanding mass in the lateral neck, what should you do?
intubate!!
if guy is stabbed in the neck and there are crackly sounds w/palmating the anterior neck tissue, what should we do?
fiberoptic broncoscope!!
txt for cardiogenic shock?
diuretics, tx the HR to 60-100, then address the rhythm. Next give vasopressor support if necessary
once you’ve intubated the pt, what’s the best next step?
check bilat breath sounds! then check pulse ox, keep it > 90%
if you have intubated a pt and find decreased breath sounds on the left, what happened?
you intubated the rt mainstem broncus– pull out!!
a pt has has inward mvmt of the rt ribcage upon inspiration. Dx? txt?
Dx: flail chest (> 3 consec rib fractures)
Txt: O2 and Pain control
a pt has confusion petechial rash in chest, axilla and neck and acute SOB. Dx? when to suspect it?
Dx: fat embolism
Suspect it: after long bone fracture (esp femur)
A pt dies suddenly after a 3rd yr medical student removes a central line. Dx? when else to suspect it?
Dx: air embolism.
Suspect it also when: lung trauma, vent use, during heart vessel surgery
if pt is hypotensive and tachycardic, worry about…
shock!
If pt is hypotensive, tachy w/flat neck veins and nl CVp what should you wory about?
shock! hypovolemic vs hemorrhagic
what’s next best step if pt is in hemorrhagic/hypovolemic shock (tachy, hypotensive, flat neck veins, nl CVP)
2 large bore periph IV- 2L NS or LR over 20 min followed by blood
if heart sounds are muffled, there’s JVD and electrical alternans and pulsus paradoxus– what are you worried about?
pericardial tamponade
how do you confirm pericardial tamponade?
FAST scan
what is the txt for pericardial tamponade?
Needle decompression, pericardial window or median sternotomy
if there are decreased breath sounds on one side and tracheal deviation AWAY from the collapsed lung what are you worried about?
tension pneumothorax
what is next best step for tension pneumo?
needle decompression, followed by chest tube. Don’t do CXR.
what would you expect on PE with hypovolemic shock?
hypotensive, TACHY, DIAPHORETIC, COOL, CLAMMY extrem
what do you see on a Swan-Ganz catheter in hypovolemic shock?
RAP/PCWP decreases
SVR increases
CO decreases
how do you txt hypovolemic shock?
crystalloid resuscitation
what causes vasogenic shock?
decreased resistance w/in capitance vessels, seen in sepsis (LPS) and anaphylaxis (histamine)
what is PE on person with vasogenic shock?
AMS, hypotension, WARM, DRY extrem (early), late looks like hypovolemic
what do you see on Swan-Ganz cath in vasogenic shock?
RAP/PCWP decreased
SVR decreased
CO increased (EF decreases)
how do you treat vasogenic shock?
fluid resuscitation (may cause edema) and tx offending organism
what is neurogenic shock?
form of vasogenic shock caused by spinal cord injury, spinal anesthesia, or adrenal insufficiency (suspect in pts on steroids encountering a stressor!!) causes an acute loss of sympathetic tone.
what do you see on PE in neurogenic shock?
hypotensive, BRADYCARDIC, WARM, DRY etrem, absent reflexes and flaccid tone. Adrenal insuff will have hypoNa and HyperK
what is the workup for penetrating wound in zone 1 of the neck (from the cricoid down)
aortography
how do you txt neurogenic shock?
in adrenal insuff: txt w/dexamethasone and taper over several weeks
what is cardiocompressive shock?
cardiactamponade or other processes exerting pressure on the heart so it can’t fulfill its role as a pump
what do you see on PE in cardio-compressive shock?
hypotensive, tachy, JVD, decreased heart sounds, nl breath sounds, pulsus paradoxus
if pt has a stab wound to the abdomen, but pt is stable- what do you do?
FAST exam. DPL (diagnostic peritoneal lavage) if FAST is equivocal. Exlap if either FAST or DPL are positive
if blunt abdo trauma pt w/hypotension/tachy, what should you do?
ex-lap
what is cardiogenic shock?
failure of heart as a pump– arrhythmias or acute heart failure
what would you expect to see on PE in person w/cardiogenic shock?
SOB, clammy extremities, rales bilat, S3, pleural effusion, decreased breath sounds, ascites, peripheral edema
what would you expect to see on swan-ganz cath in termsof RAP/PCWP, SVR and CO in cardiogenic shock?
RAP/PCWP increased
SVR increased
CO decreased
txt for cardiogenic shock?
diuretics, tx the HR to 60-100, then address the rhythm. Next give vasopressor support if necessary
what would we hear/see on PE for person with a pneumothorax?
absent/decreased breath sounds on one side, hyperressonance to percussion, distended neck veins and tracheal deviation if tension pneumo
what would we hear on PE for person with hemothorax?
absent/decreased breath sounds on one side, dull to percussion
when do we take someone to the OR for hemothorax?
high output > 1.5 L immediately or greater than 200 cc/hr over first 4 hours