Formula sheets, the key method steps for every topic and 6 practice problems, with full solutions at the back.
A woman with epilepsy is planning a pregnancy. Which advice is most appropriate?
A woman in labour is 8 cm dilated. The fetal heart rate shows decelerations that begin and end with each contraction and mirror its shape, with moderate variability. What is appropriate?
A patient weighs 22 kg. The prescribed dose is 2 mg/kg per day, given in 2 equal doses. How many milligrams D are given per dose?
A patient weighs 68.2 lb. The prescription is 0.5 mg/kg as a single dose, and the stock contains 40 mg in 1 mL. Using 1 kg = 2.2 lb, what volume V do you give? Round to two decimal places.
Infuse 1000 mL over 10 hours with a giving set of 10 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 60 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 · Review her medicines with her doctor before conception
Preconception review allows a switch to the lowest-risk effective drug, often at the lowest effective dose, and higher-dose folic acid. Most women can breastfeed while taking antiepileptics.
Answer: D · Continue to monitor; this pattern is benign
These are early decelerations, caused by head compression in active labour. With moderate variability they are reassuring, and no intervention is needed beyond continued monitoring.
Answer: D = 22 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 = 0.39 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 = 17 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: 17 gtt/min.
Answer: t = 11.3 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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