sleeplessinlosangeles wrote:I clearly have complex sleep apnea, both obstructive and central however it's the central which is really kicking my hiney since my CPAP machine has no effect.
I was looking at Adaptive Servo-Ventilation (ASV) technology but I don't understand how this can possibly work.
Unless it's physically shoving the air into my lungs (very painful) how is it going to get air into my lungs when I simply am not making the effort to take the breath? If the signal to breathe is not present, how does it bypass this?
Frankly, looking at it logically I'm more than a little skeptical. The max pressure of the machine is 10cm. My CPAP machine is already set to 10cm and it does nothing for my central apnea.
So, since the machine at 10cm cannot possibly be forcing air into ones lungs how is it possible that it could get you to take the breath if you are not receiving the signal to do so? Seems a bit fishy to me.
Adaptive Support Ventilation (ASV)
Adaptive Support Ventilation (ASV) is a positive pressure mode of mechanical ventilation that is closed-loop controlled. In this mode, the frequency and tidal volume of breaths of a patient on the ventilator are automatically adjusted based on the patient’s requirements. The lung mechanics data are used to adjust the depth and rate of breaths to minimize the work rate of breathing. In the ASV mode, every breath is synchronized with patient effort if such an effort exists, and otherwise, full mechanical ventilation is provided to the patient.
ASV technology was originally described as one of the embodiments of US Patent No. 4986268. In this invention, a modified version of an equation derived in physiology in 1950  to minimize the work rate of breathing in man, was used for the first time to find the optimum frequency of mechanical ventilation. The rationale was to make the patient's breathing pattern comfortable and natural within safe limits, and thereby stimulate spontaneous breathing and reduce the weaning time. A prototype of the system was built by the inventor in late 1980s. The inventor is Dr. Fleur T. Tehrani who is a university professor in the US. Shortly after the Patent was issued in 1991, Hamilton Medical, a ventilator manufacturing company, contacted the inventor and discussed marketing the technology with her. Some years later, Hamilton Medical marketed this closed-loop technique under license of this Patent as ASV.
Since the issuance of the Patent, a number of articles have been published by the inventor and her colleagues that are related to the invention, and some of them describe further advancements of the closed-loop techniques presented in the Patent.
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