Ventilation-perfusion mismatches common in COVID-19 hypoxaemia

CT scans show 'striking perfusion abnormalities', US radiologists say

Ventilation-perfusion mismatches in the lungs contribute to hypoxaemia in patients with COVID-19, researchers report.

Doctors from Massachusetts General Hospital in Boston, US, used dual-energy CT imaging to characterise lung perfusion in three patients with COVID-19 who presented with elevated concentrations of D-dimer and clinical suspicion of pulmonary emboli.

No pulmonary emboli were observed but there were “striking perfusion abnormalities that have not been previously described”.

“In

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