RRa®Noninvasive Acoustic
Respiration Rate

Acoustic Respiration Rate (RRa) is a breakthrough measurement that allows clinicians to noninvasively and continuously monitor patients’ respiration rate

Rainbow Acoustic Sensor

Easy-to-Use > Patient-Tolerant

Sleeping patient with RRa sensor

How It Works

rainbow Acoustic Monitoring noninvasively and continuously measures respiration rate using an innovative adhesive sensor with an integrated acoustic transducer that is easily and comfortably applied to the patient's neck.

Using acoustic signal processing that leverages Masimo's patented Signal Extraction Technology® (SET®), the respiratory signal is separated and processed to display continuous respiration rate.

Acoustic Signal

Clinical Benefits of Respiration Rate Monitoring

Respiration rate is a critical vital sign that provides early identification of respiratory compromise and patient distress1

  • > Researchers found that monitoring of respiration rate is especially important for post-surgical patients receiving patient-controlled analgesia (PCA) for pain management as the sedation can induce respiratory depression and place patients at considerable risk of serious injury or death.2,3
  • > Although the Anesthesia Patient Safety Foundation (APSF) recommendations include oxygenation and ventilation monitoring in all patients receiving opioids,4 current methods for respiration rate monitoring can be limited by reliability or patient tolerance.5, 6
  • > rainbow Acoustic Monitoring may help you meet APSF recommendations for monitoring respiratory rate in post-operative patients.


  • 1 Buist et al. Resuscitation. 2004 Aug;62(2):137-41. Association between clinically abnormal observations and subsequent in-hospital mortality: a prospective study.
  • 2 Joint Commission on Accreditation of Healthcare Organizations. Sentinel event alert: patient controlled analgesia by proxy; JCAHO. 2004.
  • 3 Institute for Safe Medication Practices. Safety issues with patient-controlled analgesia: Part II – How to prevent errors; ISMP. 2003.
  • 4 Conclusions and Recommendations Fall 2011 Conference Essential Monitoring Strategies to Detect Clinically Significant Drug-Induced Respiratory Depression: Why and How? http://www.apsf.org/resources/oivi/
  • 5 Patino et al. Paediatr Anaesth. 2013 Sep 3. Accuracy of Acoustic Respiration Rate Monitoring in Pediatric Patients.
  • 6 Mimoz O. et al. British Journal of Anaesthesia 108 (5): 872–5 (2012).

Upgradable rainbow SET® Technology Platform

rainbow SET® is a noninvasive monitoring platform featuring Masimo SET® Measure-through Motion and Low Perfusion pulse oximetry with the option to measure multiple additional blood constituents and physiologic parameters.

  • > Oxygen Saturation (SpO2)
  • > Pulse Rate (PR)
  • > Perfusion Index (PI)
  • > Total Hemoglobin (SpHb®)
  • > Oxygen Content (SpOC)
  • > Pleth Variability Index (PVI®)
  • > Methemoglobin (SpMet®)
  • > Carboxyhemoglobin (SpCO®)
  • > Acoustic Respiration Rate (RRa®)
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Caution: Federal (USA) law restricts this device to sale by or on the order of a physician. See instructions for use for full prescribing information, including indications, contraindications, warnings, and precautions.