In the present work we have directly proven that the more frequent administration of sodium-heparin in the TTECG group was associated with significantly less total coronary occlusions (p=0.0437) and intracoronary thrombus rate (p=0.0241), compared to controls. Moreover, the coronary flow before percutaneous coronary intervention was also significantly (p=0.0490) higher in the TTECG group as compared to controls. Our findings indicate that 1) recording and transmitting of TTECG and the TTECG-based consultation between paramedics and cardiologists during the first medical contact of STEMI patients is important for the optimal medical care and 2) prehospital administration of sodium-heparin reduces thrombus formation and occlusion.