There is no heartbeat on the ECG. What if the doctor doesn't sign it?
If there is no heartbeat on the ECG and the doctor doesn't sign it, then the ECG is, uh, unacceptable. So we need to find out why there is no heartbeat on the ECG. Is the machine broken or is the doctor negligent? But in any case, without the doctor's signature, it is impossible for this ECG to be recognized by everyone.