A 42-year-old woman is brought into ED resus by ambulance with sudden onset breathlessness at 36 weeks gestation. She has been taking labetalol 200mg TDS for the last 2 weeks for new-onset hypertension.
Observations on arrival:
HR 115
BP 180/120
RR 38
O2 sats 92% on 15L non-rebreather
Temp 36.7
Alert to voice