What does a flat line on an EKG strip usually indicate?

A flat line on an EKG strip, often referred to as asystole, typically indicates that there is no electrical activity occurring in the heart. This absence of electrical activity means the heart is not contracting, which suggests that it is not effectively pumping blood throughout the body. Therefore, when assessing an EKG, a flat line is a critical finding that must be addressed immediately, as it signifies a life-threatening situation.

In contrast, normal sinus rhythm would show distinct waves indicating heartbeats, while bradycardia refers to a slower than normal heart rate, both of which would not present as a flat line. An electrolyte imbalance can cause various changes in the heart's rhythm or morphology, but it would not typically result in a flat line unless it leads to a more severe condition like asystole.