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patient and two nurses using the servo-u


Ventilation where the patient’s own respiratory drive controls timing and assist delivered by the ventilator.


Personalised ventilation provides unique patient insight and ventilation capabilities. It consists of a diagnostic tool that helps you monitor diaphragm activity (Edi) on the ventilator screen and a ventilation mode (NAVA) that uses the diaphragm activity to deliver assist adapted to the patient.

Personalised ventilation can help you:

Support throughout the treatment

illustration nava

Invasive NAVA

Synchronised assist, weaning and sedation management, supporting early diaphragm activation.

Illustation non-invasive nava

Non-invasive NAVA

Synchronised assist, independent of leakages allowing a gentler mask application.

illustration monitoring

Edi monitoring

Monitor diaphragm activity  and breathing effort after extubation. Can be used with High Flow therapy if needed.


See and deliver what your patient wants

In most intensive care units 20% of patients consume 80% of ventilation resources, which may lead to increased complications and unwanted outcomes. [11] For these patients conventional ventilation simply isn’t enough. With personalized ventilation, the ventilator shows you what the patient wants, which may help you wean earlier with increased comfort, decreased sedation and reduced complications.


During normal respiration, a spontaneous breath begins with an impulse generated by the respiratory centres in the brain. This impulse is then transmitted via phrenic nerves and electrically activates the diaphragm, leading to a muscle contraction. The diaphragm contracts into the abdominal cavity, which leads to a descending movement, creating a negative alveolar pressure and an inflow of air.

The signal that excites the diaphragm is proportional to the integrated output of the respiratory centre in the brain and controls the depth and cycling of the breath.

With personalised ventilation the electrical discharge of the diaphragm is captured by a special catheter fitted with an array of electrodes (the Edi catheter) and visualised on the ventilator screen. This is Edi, the electrical activity of the diaphragm. The Edi catheter is placed in the esophagus much like an ordinary feeding tube. With NAVA, Neurally Adjusted Ventilatory Assist, the Edi is used to deliver ventilation in time with and in proportion to the diaphragm activity.

1. Identify common ventilator challenges

Only 10% of experienced clinicians detect auto-triggering, one of many challenges that can result in patient-ventilator agitation, increased sedation and delayed weaning. This is because the ventilator waveforms show you what the ventilator delivers, not what the patient wants. [12]

Seeing patient diaphragm activity on screen (Edi) helps you:

  • monitor and safeguard the patient’s diaphragm activity [13] [14]
  • assess effort and work of breathing during weaning [15]
  • prevent muscular exhaustion during weaning trials, even after extubation. [16]

2. Keep the diaphragm active

Edi helps you detect diaphragm activity early and Neurally Adjusted Ventilatory Assist (NAVA) helps you exercise the diaphragm on a personalised level. [17] [18]

3. Protect the lung from injury and wean earlier

An active diaphragm is the first step towards successful weaning. The second step is to avoid lung injury. NAVA delivers assist in proportion to and in synchrony with the patient’s respiratory efforts, which can contribute to:

  • fewer periods of over- and under-assist [19] [20]
  • Improved patient-ventilator synchrony [12] [20]
  • reduced sedation [21] [22]
  • improved comfort scores [23]
  • improved sleep quality [24] [25]


Improve your knowledge with our eLearning courses

The basic concept of NAVA and Edi
NAVA module 1 (10 min)

  • Breathing regulation
  • Conventional ventilatory treatment
  • Edi and NAVA treatment

English (voice over) | Dutch | French | German | Italian | Spanish | Swedish

The basic concept of NAVA and Edi
NAVA module 2 (10 min)

  • Breathing regulation
  • Conventional ventilatory treatment
  • Edi and NAVA treatment

English (voice over)