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Apart from being immobile for few days there is no other risk factors which could predispose him to have PE.The ECG is shows sinus tachy(no signs of AF)and the tachycardia has resolved after 24hr.there were no obvious signs of DVT but the Doppler has shown signs of DVT in the right calf area. No other past medical history apart from hypertension and nothing significant apart from the symptoms i mentioned.