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Nasal ALAR SpO2 Pulse Oximetry Sensor

The Nasal Alar SpO2 Sensor is uniquely designed to take advantage of the robust vascular physiology of the nasal ala, suitable for use in ICU, ITU and Critical Care.


The challenge with traditional pulse oximetry is that when the need is most critical, the technology is most challenged and least likely to provide a consistent and reliable measurement. The most frequently used site for pulse oximetry is the – less than optimal – distal portion of the finger. The fingertip is subject to a number of challenges that make it inconsistent as a monitoring site including: decreased peripheral perfusion resulting from cardiovascular disease or hypovolemia, hypothermia, anxiety, or vasoactive medications; signal distortion due to motion; and ambient light interference, to name a few. In addition, during surgery the patient’s hands are often covered or wrapped, providing limited access by the anesthesiologist.

The nasal ala, the fleshy part of the nose adjacent to the opening of the nares (nostril), is a region rich in vasculature that offers a unique monitoring site for pulse oximetry. This site is fed by both the external and internal carotid arteries. The internal carotid provides blood to the brain, and this multi-directional arterial supply provides strong, reliable photoplethysmography signals that are rapidly responsive to changes in the patient’s arterial oxygen saturation. Unlike the extremities, this measurement site is less susceptible to patient movement and loss of signal due to variations in peripheral perfusion. And it is easily accessed by an anesthesiologist during surgery.

Placement of the Nasal Alar SpO2 Sensor is simple, fitting comfortably on the nasal ala. Since secure sensor placement does not depend upon adhesive attachment, the sensor is easily removed and reapplied as necessary for use throughout the length of the patient’s hospital stay.


Studies and Advertorials 

Medtech innovation briefing [MIB113] for our Nasal Alar SpO2 sensor – ALAR

Here is a new comparative study (2018) examining nasal and forehead oximetry accuracy and pressure injury in critically ill patients:

Evaluation of the nasal pulse oximetry sensor during robot-assisted laparoscopic prostatectomy

Pentland Medical Alar Advertorial – AAGBI Journal

Key features

  • Provides reliability and measurement accuracy
  • Is unaffected by diminished peripheral perfusion
  • Enables faster detection of oxygen saturation changes
  • Provided consistent accuracy even at very low saturations
  • Easy access – Nasal ala attachment site is easily accessed during surgery
  • Economical, secure and comfortable – Non-adhesive attachment is easy to re-position and allows use for lengthy procedures or length of stay.
  • Robust monitoring – Alar site is resistant to monitoring interruptions that result from ambient light interference or motion-induced signal distortion.



NHS Improvement Guidelines for SpO2 Sensor Placement, 2019

NHS Improvement Guidelines for SpO2 Sensor Placement


Available Items
ALARA1X Nasal ALAR Sensors 24/box