Inter-device reliability of the NPi-100 pupillometer

Area of Science:

• Neurology
• Medical Devices
• Ophthalmology

Background:

• The pupillary examination is crucial in neurological assessments.
• Traditional flashlight-based pupil evaluation exhibits limited inter-rater reliability.
• Automated pupillometers offer objective pupil size and reactivity scoring.

Purpose of the Study:

• To evaluate the inter-device reliability of NPi-100 pupillometers.
• To determine if different NPi-100 devices yield consistent measurements.
• To assess the reliability of automated pupillary assessments in clinical practice.

Main Methods:

• 210 paired measurements using NPi-100 pupillometers.
• 33 practitioners assessed 20 patients at risk for cerebral edema.
• Statistical analysis included mean differences and Cohen's Kappa.

Main Results:

• No significant differences in mean pupil size (maximum and minimum) or reactivity between devices.
• Cohen's Kappa indicated almost perfect agreement for pupil size and reactivity.
• High inter-device reliability was observed for both right and left eyes.

Conclusions:

• NPi-100 pupillometers show high inter-device reliability.
• Automated pupillary assessments provide consistent objective data.
• This reliability supports the use of NPi-100 devices in neurological examinations.