Which of the following is NOT a type of threshold test?

Voltage stabilization is not considered a type of threshold test within the context of cardiac rhythm management. Threshold tests are typically designed to measure the lowest levels of stimulation or activity required to elicit a desired response from the heart, such as capturing a cardiac contraction.

Amplitude decrement, pacing retention, and current threshold assessment are all methods used to evaluate the heart's response to electrical stimuli at varying intensities. Amplitude decrement focuses on gradually reducing the amplitude of stimulation to identify the minimum effective level, while pacing retention tests involve assessing how well the heart can maintain capture under diverse conditions. Current threshold assessment similarly evaluates the lowest current necessary to achieve capture, making them empirical methods aligned with threshold testing practices.

In contrast, voltage stabilization is more likely to be related to ensuring the device operates within safe voltage levels to avoid excessive battery consumption or tissue damage, and it doesn't directly measure the threshold for consistent electrical conduction or cardiac response, which is the primary aim of threshold tests. This distinction is why voltage stabilization is not categorized as a threshold test.