In the case of cardiac arrest during hemodialysis, what is the first action a technician should take?

In the event of cardiac arrest during hemodialysis, the first action a technician should take is to call for assistance. This is crucial because immediate emergency response is necessary to address the life-threatening situation. By calling for assistance, the technician ensures that trained medical professionals can arrive promptly to provide advanced life support, which is essential during a cardiac emergency.

While stopping ultrafiltration or returning the patient's blood might be necessary actions in other contexts during a crisis, they do not address the immediate need for medical attention in the case of a cardiac arrest. Applying a pericardial thump is generally not a recommended action in most adult patients and is not considered a first-line response in such emergencies. The priority should always be to secure help and prepare for potential resuscitation efforts. Thus, initiating the call for assistance is a critical step in ensuring the patient's safety and increasing chances of survival.