Introduction Flashcards
tsp, ml conversion
1 tsp = 5 ml
tbsp, ml conversion
1 tbsp = 15 ml
fl oz, ml conversion
1 fl oz = 30 ml
cup, oz, ml conversion
1 cup = 8 oz = 240 ml
pint, oz, ml conversion
1 pint = 16 oz = 480 ml
qt, pint, ml conversion
1 qt = 2 pint = 960 ml
gl, qt, ml conversion
1 gallon = 4 qt = 3840 ml
kg, lb conversion
1 kg = 2.2 lbs
oz, g conversion
1 oz = 28.4 g
lb, g, oz conversion
1 lb = 454 g = 16 oz
grain, mg conversion
1 grain = 65 mg
inch, cm conversion
1 inch = 2.54 cm
meter, cm conversion
1 meter = 100 cm
% w/v equation
X g ÷ 100 ml
% v/v equation
X ml ÷ 100 ml
% w/w equation
X g ÷ 100 g
ratio strength equation
percentage strength = 100 ÷ ratio strength
ratio strength = 100 ÷ percentage strength
ppm, percentage strength conversion
ppm → percentage strength: move decimal left by four places
specific gravity equation
weight of substance (g) ÷ weight of equl volume of water (g)
g ÷ mL
alligation
high [ ] …………………….x parts of higher [ ]
————-desired [ ]———————-
low [ ]……………………….x parts of lower [ ]
- high goes high: write the higher [ ] on the top left
- low goes low: write the lower [ ] on the lower left
- write the desired [ ] in the middle
- subtract the diagonally to obtain the parts (high/low [ ] and the desired [ ])
- divide the total desired amount by the sum of parts to get amount per part
- x parts of higher multiplied by amount per part to get how much of higher
osmolarity equation
mOsm/L = [wt of substance (g/L)] ÷ [MW (g/mole)] x (# of particles) x 1000
isotonicity equation
E = [58.5 x i] ÷ [MW of drug x 1.8]
mols equation
mol = g ÷ MW
mmol = mg ÷ MW
milliequivalents equation
mEq = (mg x valence) ÷ MW = mmols x valence
carbs, proteins kcals
4 kcal/gram
fat kcal
9 kcal/gram
dextrose kcal
2.4 kcal/ gram
amino acid soln kcal
4 kcal/gram
ILE 10% = _ kcal/mL
1.1 kcal/ml
ILE 20% = _ kcal/ml
2 kcal/ml
ILE 30% = _ kcal/ml
3 kcal/ml
equation to determine fluid needs
1500 mL + (20 ml)(weight in kg - 20)
can also roughly estimate using 30-40 ml/kg/day
total energy expenditure equation
TEE = BEE x activity factor x stress factor
grams of nitrogen from protein equation
nitrogen (g) = protein intake (g) ÷ 6.25
corrected Ca for albumin < 3.5
not needed if ionized Ca
Ca corrected (mg/dL) = Ca + [(4.0 - albumin) x 0.8]
BMI
BMI = weight (kg) ÷ height (m^2) = [weight (lbs) / height (in^2)] x 703
IBW equation
males: 50 kg + [2.3 x (height - 60 inches)]
females: 45.5 kg + [2.3 x (height - 60 inches)]
Adj BW equation
AdjBW = IBW + 0.4 (TBW - IBW)
when to use TBW vs IBW
- use TBW if underweight
- if normal weight or greater, most drugs do TBW
- drugs that use IBW: acylovir, aminophylline, levothyroxine, and theophylline (but only if not underweight)
- drugs that use AdjBW: AG (but only if obse)
lab value determining dehydration
BUN:SCr > 20:1
Cockcroft-Gault
CrCl (ml/min) = [(140 - age) ÷ (72 x SCr)] x weight (kg)
multiply by 0.85 if female
pH value of acidosis
< 7.35
pH of alkalosis
> 7.45
arterial blood gas order
xx/xx/xx/xx/xx
pH / pCO2 / pO2 / HCO3 / O2 sat
respiratory alkalosis ABG lab value
pCO2 < 35
respiratory acidosis ABG definition
pCO2 > 45
metabolic acidosis ABG dfinition
HCO3 < 22
metabolic alkalosis ABG definition
HCO3 > 26
anion gap equation
AG = Na - Cl - HCO3
pH equation
pKa + log [salt/acid]
or base/salt
% ionization of a weak acid
% ionization = 100 ÷ [1 + (10^(pKa - pH))]
% ionization of a weak base
% ionization = 100 ÷ [1 + (10^(pH - pKa))]
ANC equation
ANC = WBC x [(% segs + % bands) ÷ 100]
celsius, farenheit conversion
C = (F - 32) ÷ 1.8
time to burn (TTB) equation
TTB (with sunscreen in min) = SPF x TTB (wihtout sunscreen)
risk equation
number of subjects i ngroup with unfavorable even ÷ total number of subjects in group
relative risk equation
risk in treatment group ÷ risk in control group
relative risk reduction
(% risk in control group - % risk in treatment group) ÷ (% risk in the control group)
absolute risk reduction
% risk in contorl group - % risk in treatment group
NNT or NNH
1 / ARR
odds ratio equation
[(patients who were exposed and had event) x (patients not exposed and had no event)] ÷ [(patients exposed and had no event) x (patients not exposed and had event)]
pack year smoking hx
cigarrets or packs per day ÷ years smoked
hazard ratio equation
hazareed rate in the treatment group ÷ hazard rate in teh control group
initial basal bolus insulin in T1DM calculation
- TDD = 0.5 U /kg/day
- half to basal and other half to rapid acting (split evenly amongst meals)
insulin correction dose
(BG - target BG) ÷ correction factor
friedewald equation
LDL = TC - HDL - (TG ÷ 5)
do NOT use if TG > 400
BSA equation
mosteller equation
sqrt [ (cm x kg) ÷ 3600]
bioavailability equation
F = 100 x (AUC extravascular ÷ intravenous) x (dose IV ÷ extravascular)
Vd equation
amount of drug in body ÷ [ ] of drug in plasma
Cl equation
Cl = (F x dose) ÷ AUC = ke x Vd
drug [ ] prediction equations
- C2 = C1 x e ^ (-kt)
- ke = [ ln ( C1 ÷ C2)] ÷ t
half life equation
0.693 ÷ke
loading dose equation
(desired [ ] x Vd) ÷ F
MAP equation
2/3 DBP + 1/3 SBP
phenytoin correction for albumin < 3.5
total phenytoin ÷ [(02 x albumin) + 0.1]
KCl PO soln to tablets
KCl 10% = 20 mEq/15 ml
elemental Ca in calcium carb
calcium carb = 40% elemental Ca
elemental Ca in calcium citrate
calcium citrate = 21% elemental Ca
aminophylline, theophylline conversion
theophylline → aminophyline: divide by 0.8
statin dose equivalence
- pitavastatin 2mg
- rosuvastatin 5mg
- atorvastatin 10mg
- simvastatin 20mg
- lovastatin 40mg
- pravastatin 40mg
- fluvastatin 80mg
metoprolol PO IV conversion
IV:PO = 1:2.5
loop diuretic dose equivalence
- ethacrynic acid 50mg
- furosemide 40mg
- torsemide 20mg
- bumetannide 1mg
all loops have a 1:1 IV PO ratio except furosemide (1:2)
insulin dose conversion
- usually 1:1 conversion
- NPH dosed BID → glargine : glargine dose = 80% of NPH TTD
- glargine or detemir = 80% of toujeo
levothyroxine IV PO conversion
IV: PO = 0.75:1
steroids dose equivalence
- cortisone 25mg
- hydrocortisone 20mg
- prednisone and prednisolone 5mg
- methylpred 4mg
- triamcinolone 4mg
- dexamethasone 0.75mg
- betamethasone 0.6mg
Lithium conversions
5 mL Li citrate syrup = 300mg Li carb = 8 mEq Li+ ion