Thank you for your kind reply. I apologize for not being clear enough in my question.
Please let me clarify my question. Indeed the Respironics systems do label this variable as “Vibratory Snoring.” What I don’t understand is what the machine is actually measuring when it reports this. For example, it might be measuring a rapid but shallow variation in the air pressure caused by some anomaly in the patient’s airway. It might be measuring a certain kind of audio signal, etc.
It is my understanding that actual snoring is a result of a partial collapse of the airway and that rapid opening and closing causes the sound others refer to as ‘snoring.’ In my case, this value for many years was reporting in the range of 0-3 events per hour. Then, starting in August or September, the value began a rather rapid increase over a period of several days until settling around a value of ~20 events per hour. VS and also Hypopneas should normally respond to an increase in EPAP. I tried that, increasing my EPAP upwards by a few cmH2O. Instead of seeing a decrease as expected, the VS number increased by 50% to about ~30 events per hour. Reducing the EPAP value back to the former value dropped the VS number back to the ~20 or so.
Hence the question of what is actually being measured?