Calculation skills Flashcards
volume = dose/concentration
rate (volume/time) = dose-per-time/concentration
in this question its important to add the 500ml of glucose
1000 nanograms = 1mcg
to work out mmol (dose) = concentration (mmol/L) x volume (L)
what is mmol a measurement of
used to quantify the amount of a substance
In medicine what does mmol/L refer to
used to describe the concentration of electrolytes or solutes in the blood.
answer this question and what is an important point
beware of maximum dose
identify the distractor:
A 72-year-old man is having a catheter change. He needs a stat dose of gentamicin 5mg/kg. Weight 75kg.
Gentamicin is infused over 30 minutes.
Prescribing request
What dose (g) of gentamicin should be prescribed?
(write your answer in the box provided)
Gentamicin is infused over 30 minutes.
identify the distractor
Weight 16kg and height 98cm
what does this mean: “Drug B is initially available as a 2.5mg/1ml suspension but requires dilution with an equal volume of sodium chloride 0.9% prior to use.”
1ml + 1ml (adding equal amount) = 2ml
3.2.5mg/1ml = initial concentration
2.5mg/2ml = diluted concentration (x2, 1:2 dilution)
what dose this mean: “Drug B is initially available in 10ml ampoules of 50mg/25ml with each ampoule subsequently diluted with 90ml of sodium chloride 0.9% prior to use.”
10ml of drug with 90ml of diluting solution
1 part drug to 9 parts solution = 1:10 dilution
x10
25ml x 10 = 250ml
50mg/250ml is diluted concentration
answer this and identify the distractors
