very common occurance in prolonged flight patients complaining of breathlessness sudden onset . reduced fluid intake and stasis of blood in legs prone to develop blood clots in calf veins which migrate to the heart thence to lungs . if the clot is massive and causing a big filling defect in central pulmonary artery , the case should be operated immediately . if the clots are peripheral then it. other is managed medically . othe r causes of clot formation is patient on contraceptive pills .
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