Adaptive Servo Ventilation: Treatment for Central Sleep Apnea

Adaptive Servo Ventilation (ASV) – is a medical technology that utilizes positive airway pressure ventilatory support that is adjusted based on the detection of apneas, or pauses in breathing, during sleep. It is primarily used in the treatment of Central Sleep Apnea. It is also used for complex sleep apnea, mixed sleep apnea, periodic breathing – Cheyne – Stokes respirations. The device resembles CPAP machines (Continuous Positive Airway Pressure) and uses the same masks, hoses, and attachments.

How is Adaptive Servo Ventilation (ASV) different from CPAP and BiPAP?

While CPAP provides one continuous pressure, and BiPAP provides two pressures (on inhale and exhale), ASV adjusts the pressure based on an algorithm.

ResMed’s devices is called Adapt SV.

How Adaptive Servo Ventilation (ASV) Works

Per ResMed’s website, the algorithm is programmed as follows:

“The patient’s own recent average respiratory rate—including the ratio of inspiration to expiration and the length of any expiratory pause.The instantaneous direction, magnitude, and rate of change of the patient’s airflow, which are measured at a series of set points during each breath. A backup respiratory rate of 15 breaths per minute.”

 “By ventilating the patient appropriately during periods of hypopnea and apnea and reducing support during periods of hyperventilation and normal breathing,the ASV algorithm rapidly stabilizes breathing patterns and arterial blood gases and minimizes discomfort and arousals often associated with bilevel treatment.”


Adaptive Servo Ventilation
Similar design of Adaptive Servo Ventilation Unit

Comparison of CPAP, BiPAP, APAP (auto-PAP) and Adaptive Servo Ventilation (ASV) are described in the above sections.

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