How did biotelemetry in Emergency Medical Services (EMS) utilize wireless technology in the 1970s?

Transmitting a patient's electrocardiogram (ECG) readings back to a hospital emergency room while en route

In the 1970s, one of the most significant applications of biotelemetry focused on improving acute emergency medical services (EMS). Ambulances were equipped with wireless technology allowing them to capture critical data from patients experiencing emergencies, most notably cardiac events. This data, specifically the patient's electrocardiogram (ECG) readings, was transmitted wirelessly to the emergency room staff at the destination hospital while the ambulance was still in transit. This capability was revolutionary because it allowed doctors to remotely assess the nature of the emergency and prepare the necessary interventions and personnel before the patient even arrived, significantly reducing the time required for critical care delivery.