The astronaut, guided in real time and interpreted by two independent radiologists on earth, performed a follow-up ultrasound, which confirmed the diagnosis.
Since NASA had not encountered this condition in space before, multiple speciality discussions weighed the unknown risks of the clot traveling and blocking a vessel against anticoagulation therapy in microgravity.
Although the ISS pharmacy had 20 vials of the injectable blood thinner enoxaparin, there was no anticoagulation-reversal drug.
The injections posed their own challenges—syringes are a limited commodity, while drawing liquids from vials is notoriously difficult because of surface-tension effects.
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