Non-invasive CNAP Monitoring technology

The next generation of noninvasive monitoring of bloodpressure and cardiac output:
Merging the advantages of noninvasive, risk-free methods with the benefits of continuity in the same accuracy as invasive standards for bloodpressure and cardiac output parameters.

Noninvasive and continous

  • Noninvasive and beat-to-beat management of full hemodynamics: blood pressure, hemodynamics (CO, SV etc.) and fluid status (PPV/SVV)
  • Enhancing standard hemodynamic assessment with e.g. Goal Directed Therapy (GDT) also in low and medium risk surgeries - without the need for an arterial catheter.
  • All from one sensor: appreciated in  research applications as no additional equipment necessary ​


Easy to use

  • Quick set-up through slip-on design of CNAP® finger sensor 
  • Plug & play
  • Waveform and values available shortly upon startup


Cost effective

  • Saving time and money due to the reusable CNAP® finger sensor
  • Error-free application through easy handling
  • Requiring minimal training effort


Product Features

  • Real-time systolic, diastolic, mean blood pressure and pulse rate
  • High-fidelity CNAP® blood pressure waveform

  • CO (Cardiac Output with CNAP® HD and Pulse Contour analysis), SV (Stroke Volume), PPV/SVV (Pulse Pressure Variation, Stroke Volume Variation)* and SVR (Systemic Vascular Resistance) allowing for hemodynamic monitoring and fluid optimization*
  • Easy-to-use CNAP® finger sensor for a quick and easy setup for every day clinical use

  • Automatic sensor sizing
  • Different calibration modes to upper arm blood pressure (NBP, oscillometric)

  • easy integration in patient monitoring "BP Wave Out"
  • adjustable alarming system
  • 8.4” colour anti-reflective screen
  • integrated thermal printer
  • rechargeable internal battery for up to two hours of CNAP® operation
  • measurement duration up to 24 hours
  • additional analog out connector - customizable assignment

How does CNAP work?

CNAP® stands for Continuous Noninvasive Arterial Pressure and has been developed and steadily improved by CNSystems. 

CNAP® blood pressure is measured beat-to-beat on the finger artery by means of the very easy-to-use CNAP® double finger sensor applying different interacting methods and algorithms defined and patented as our CNAP® technology. Automatic calibration of the finger blood pressure values to the brachial artery by means of an integrated NBP upper arm measurement (or other possible calibration modes) delivers absolute blood pressure values. 

The CNAP® blood pressure technology is integrated in the CNAP® Monitor.

From the CNAP® blood pressure signal many other essential hemodynamic parameters provided by the CNSystems product portfolio are derived for completing the hemodynamic picture for an easy diagnosis and therapy and for improving patient outcome.

How accurate is it? – Validation

A large number of clinical and scientific studies have been performed validating CNAP® blood pressure against standard blood pressure measurement methods such as invasive (and continuous) arterial line (IBP) or noninvasive (but intermittent) NBP upper arm blood pressure measurement.


  • CNAP® measurements are comparable to invasive arterial line measurements in terms of Continuity, accuracy and waveform dynamics.1,2,3
  • CNAP® delivers reliable results for the efficient treatment of ICU and ER patients.4,5, 6,7
  • CNAP® provides excellent results during the induction of anesthesia.8
  • CNAP® shows outstanding performance in monitoring pediatric patients.9,10
  • CNAP® proves as an appreciated research tool for analysing psychophysiological response. 11,12,13
  • CNAP® helps to maintain better BP stability by quicker recognition of hypo-/hypertension and the treatment response without the need for arterial catheterisation which improves outcome in comparison to NBP

How does CO with CNAP® HD work?

Our Cardiac Output-algorithm used in the CNAP® Monitor HD is based on pulse contour analysis (PCA), where the highly accurate CNAP® blood pressure waveform provides the basis for cardiac output measurements.

CO* with CNAP® HD incorporates physiological considerations as well as patient parameters. Four physiological factors determine cardiac output and can be represented by the markers shown in Figure 1.

Physiological factors:

  • Preload
  • Contractility
  • Afterload
  • Compliance of vessels

All these markers can be derived from an accurate pulsewaveform:

CO provided by CNAP® HD was developed using mathematical learning tools based on methods from high-energy physics using comprehensive data sets for evaluation.

Our CO measurement is an easy-to-use and accurate method for continuous cardiac output measurement with the same sensor that is used for beat-to-beat blood pressure!