Clipping of waveforms occurs when:

Clipping of waveforms occurs when the signal exceeds the maximum or minimum range that can be accurately captured by the digitizer. This is typically due to the signal's amplitude being greater than the allowed limits of the A/D converter, which results in the peaks of the waveform being "clipped" or flattened, leading to significant distortion in the captured data.

In digital signal processing, the digitizer has predefined voltage limits, and any part of the signal that exceeds these boundaries cannot be represented accurately, thus resulting in the lost information of those signal parts. This phenomenon is crucial to recognize because it can severely affect the interpretation and analysis of the data, leading to misleading results or erroneous clinical decisions.

The other options, while they pertain to issues that can affect signal quality or interpretation, do not specifically lead to clipping of waveforms. Aliasing concerns how signals are sampled and represented in the digital domain, sensitivity relates to the ability to detect low-level signals without dropping them and using an inappropriate sampling rate may lead to improper representation, but these do not produce the direct effect of clipping that occurs when the signal amplitude exceeds the digitizer's operating limits.