Formula sheets, the key method steps for every topic and 6 practice problems, with full solutions at the back.
A woman at 28 weeks asks why her heart rate is higher than before pregnancy. Which response is accurate?
A woman at 37 weeks has severe itching of the palms and soles, worse at night, without a rash. Which condition should be considered?
A patient weighs 45 kg and is prescribed 7.5 mg/kg as a single dose. Find the dose D in mg.
A child weighing 10 kg is prescribed 10 mg/kg per dose of an oral suspension that contains 120 mg in 5 mL. What volume V do you give? Round to one decimal place.
Infuse 500 mL over 5 hours with a giving set of 20 gtt/mL. Find the drip rate R in drops per minute. Round to the nearest whole number.
A drip runs at 40 gtt/min through a set of 20 gtt/mL. There are 450 mL left in the bag. How many hours t until it is empty? Round to one decimal place.
Answer: B · A rise of about 10 to 15 beats per minute is normal in pregnancy
Blood volume and cardiac output rise in pregnancy, and the resting heart rate typically increases by 10 to 15 beats per minute. Blood pressure usually falls slightly in the second trimester.
Answer: C · Intrahepatic cholestasis of pregnancy
Itching of the hands and feet without a rash suggests intrahepatic cholestasis of pregnancy. Raised bile acids are linked with stillbirth, so liver function and bile acids are checked and timing of birth may be planned.
Answer: D = 337.5 mg
Dose calculation: the amount to give equals what is prescribed divided by what you have, times the quantity it comes in: amount = (desired dose/stock strength) × stock volume. Always keep the units the same (convert g to mg, mg to mcg first) and check that the answer is sensible.
Answer: V = 4.2 mL
Dose calculation: the amount to give equals what is prescribed divided by what you have, times the quantity it comes in: amount = (desired dose/stock strength) × stock volume. Always keep the units the same (convert g to mg, mg to mcg first) and check that the answer is sensible.
Answer: R = 33 gtt/min
Infusion rates: a pump is set in mL/h = volume/time in hours. A gravity drip is counted in drops per minute: gtt/min = volume (mL) × drop factor (gtt/mL)/time (min). The drop factor is printed on the tubing package: macrodrip sets deliver 10, 15 or 20 gtt/mL (blood sets often 10 gtt/mL in the US, 15 in the UK) and microdrip sets 60 gtt/mL. Always use the drop factor the question or package gives.
At the bedside you round to the nearest whole drop: 33 gtt/min.
Answer: t = 3.8 h
Infusion rates: a pump is set in mL/h = volume/time in hours. A gravity drip is counted in drops per minute: gtt/min = volume (mL) × drop factor (gtt/mL)/time (min). The drop factor is printed on the tubing package: macrodrip sets deliver 10, 15 or 20 gtt/mL (blood sets often 10 gtt/mL in the US, 15 in the UK) and microdrip sets 60 gtt/mL. Always use the drop factor the question or package gives.
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