Which condition might indicate high resistance in a lead?

When evaluating conditions that indicate high resistance in a lead, a fractured wire is a strong indication. Fractured wires within leads disrupt the normal electrical conductivity, resulting in increased resistance. This higher resistance can lead to various electrical issues, such as inadequate pacing or sensing, and can compromise the proper functioning of the device.

In contrast, normal electrode function, positive impedance, and a stable heart rhythm do not suggest high resistance. Normal electrode function indicates that the lead is operating correctly, while positive impedance readings could still fall within an acceptable range for certain applications. A stable heart rhythm signals that the heart is following its expected electrical pattern without disruptions, which does not relate to issues of lead resistance. Thus, the presence of a fractured wire is the most direct evidence of high resistance affecting lead performance.