tokens: This communication presents two patients with clinically massive PE of recent onset ( confirmed by lung perfusion scans ) who were successfully treated with a single i . v . dose of 30 mg of anisoylated lys - plasminogen streptokinase activator complex ( APSAC , comparable to 1 , 500 , 000 U of streptokinase ) followed by systemic heparinization for 7 days .