What is the maximum allowable impedance value?

The correct answer is based on the understanding of electrode impedance in polysomnography. In sleep studies, electrode impedance is a critical factor, as it can significantly affect the quality of the EEG, EOG, and EMG signals. A range of acceptable impedances ensures that the signals received are clear and free from artifacts due to poor electrical connections.

A maximum allowable impedance value of 5 KOhms strikes a balance between ensuring adequate signal integrity while allowing for practicalities in electrode application. Higher impedance levels can introduce significant noise and reduce the accuracy of the readings, which can lead to misinterpretation of sleep stages or other sleep-related events.

The other values, while plausible, are not the standard thresholds accepted in sleep study protocols. For example, 1 KOhm or 2 KOhm might be too restrictive for some practical applications, while 10 KOhms exceeds the recommended limits, leading to increased risk of poor data quality. Thus, the choice of 5 KOhms aligns with established guidelines for sleep studies, ensuring optimal data collection without compromising the integrity of the signals.