Recent-ish advancements in tech here have made it possible to continuously measure the amount of exhaled CO2 from a patient's breath, transmit EKGs wirelessly for review by a physician in a hospital, and automatically cycle a blood pressure cuff at any interval we want. All in a patient's living room with equipment carried in one hand. In the very near future these devices will widely incorporate video laryngoscopy using their screens to assist in endotracheal intubations. Video laryngoscopes are already everywhere in the field, but they use their own screen/tablet and require extra work to get recordings out of for documentation purposes.
Ultrasound (the traditional kind - nothing like this article's stickers) is already on board some ambulances. Mostly used for locating deeper veins on people that are otherwise tough/impossible to get IV access on, checking for pneumothorax, or verifying death by confirming there's no heart wall movement.
It's not out of the realm of possibility for the cardiac monitors to gobble up the ultrasound functionality next, and incorporate that into the EKG lead stickers.