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A 6-day-old term girl, home since day two and feeding well until this morning, is brought in mottled and lethargic. Heart rate is 186 per minute, respiratory rate 68 per minute and capillary refill 4 seconds. Femoral pulses cannot be felt; brachial pulses are strong. Oxygen saturation is 95 per cent on the right hand and 84 per cent on the right foot. There is a soft ejection systolic murmur and the liver edge is 3 cm below the costal margin. Membranes ruptured at delivery and the maternal group B streptococcus swab was negative. Which one of the following treatments is most urgently required?
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