Formula sheets, the key method steps for every topic and 6 practice problems, with full solutions at the back.
Which factor most increases a postnatal woman's risk of venous thromboembolism?
A woman at 28 weeks has itching, and her liver tests and bile acids are raised. Which advice is most important?
A vial contains 500 mg of powder. The label says: add 1.8 mL of water for injection to give a total volume of 2 mL. The prescription is 300 mg. What volume V of the reconstituted solution do you give?
An infusion contains 50000 units of a drug in 1000 mL. The prescription is 1200 units per hour. At what rate R do you set the pump, in mL/h?
Infuse 500 mL over 8 hours with a giving set of 15 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 15 gtt/mL. There are 300 mL left in the bag. How many hours t until it is empty? Round to one decimal place.
Answer: C · Caesarean birth
Pregnancy and the postpartum period are hypercoagulable. Caesarean birth, immobility, obesity, older age and previous VTE add to the risk. Early walking and, where indicated, prophylaxis reduce it.
Answer: B · Report reduced fetal movements straight away
Intrahepatic cholestasis is linked with stillbirth, especially with high bile acids. Women are monitored closely, told to report reduced movements and may be offered birth earlier. Cool baths and emollients ease itching.
Answer: V = 1.2 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 = 24 mL/h
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 = 16 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: 16 gtt/min.
Answer: t = 1.9 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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