The conventional method for determining pupil size and reactivity is a manual penlight examination. This examination depends on the observer and is undoubtedly subjective.
The NPi®-300 Pupillometer from NeurOptics allows easy automated and reproducible measurements of pupil size, symmetry, the pupillary light reflex, and reactivity. Using an algorithm developed and validated by NeurOptics, all measurement parameters are combined in the device to give the NPi®.
Because the entire neurological network is involved, the NPi® provides an objective and accurate record of overall pupil reactivity.
The Pupillometer is therefore an important component of multimodal neuromonitoring, allowing easy access to many other pupillary response parameters.
Successive NPi measurements enable any change in the neurological condition of a patient to be recorded quickly and reliably. Measurements taken for each pair of eyes are stored on a device called SmartGuard. They can be displayed as a trend by the Pupillometer itself and transferred to a PC using a reader called SmartGuard Reader.
With additional software, pupil measurements can also be transferred to the digital patient record in the PDMS.
The NPi® (Neurological Pupil index) developed by NeurOptics has already been used in numerous studies and publications that depend on reliable measurements. It has also been included in guidelines (AHA and ERC).
Indications for pupillometry include objective, reproducible, and documentable pupillary response measurements in patients with stroke, subarachnoid hemorrhage, or traumatic brain injury. It can also be used as a prognostic tool in resuscitated cardiac arrest patients and patients on ECMO.