SYSTEM AND METHOD FOR CONTROLLING RESPIRATORY THERAPY BASED ON DETECTED RESPIRATORY EVENTS
A method for providing positive airway pressure treatment may include delivering breathing gas toward a patient at a first pressure, detecting one or more sleep respiratory events associated with the patient, and in response to detecting the one or more sleep respiratory events, automatically triggering a ramp function to increase the pressure of the breathing gas delivered toward the patient from the first pressure to a second pressure at a predetermined rate.
1 . A method for providing positive airway pressure treatment, the method comprising:
delivering breathing gas toward a patient at a first pressure;
detecting one or more sleep respiratory events associated with the patient; and
in response to detecting the one or more sleep respiratory events, automatically triggering a ramp function to increase the pressure of the breathing gas delivered toward the patient from the first pressure to a second pressure at a predetermined rate.
2 . A method according to claim 1 , wherein:
the first pressure comprises a comfort pressure suitable to allow the patient to fall asleep; and
the second pressure comprises an effective pressure suitable to resist respiratory events.
3 . A method according to claim 1 , wherein the ramp function gradually and smoothly increases the pressure of the breathing gas from the first pressure to the second pressure.
4 . A method according to claim 1 , wherein the ramp function increases the pressure of the breathing gas from the first pressure to the second pressure in a stepped manner.
5 . A method according to claim 1 , wherein the one or more sleep respiratory events are selected from the group consisting of apnea, hypopnea, snoring, flow limitation, and combinations thereof.
6 . A method according to claim 1 , further comprising:
weighting the one or more detected respiratory events; and
determining a weighted sum of the one or more respiratory events; and
wherein automatically triggering a ramp function in response to the detection of the one or more sleep respiratory events comprises automatically triggering a ramp function if the weighted sum of the one or more detected respiratory events exceeds a predetermined threshold.
7 . A method according to claim 1 , wherein the ramp function increases the pressure of the breathing gas at a rate of between about 1 cm H 2 O per minute and about 5 cm H 2 O per minute.
8 . A method according to claim 1 , wherein:
breathing gas is delivered toward the patient over a plurality of breath cycles, each breath cycle including an inhalation portion and an exhalation portion; and
the second pressure comprises a single positive pressure level during both inhalation and exhalation phases of the breath cycle.
9 . A method according to claim 1 , wherein:
breathing gas is delivered toward the patient over a plurality of breath cycles, each breath cycle including an inhalation portion and an exhalation portion; and
the second pressure comprises a predetermined inhalation pressure delivered during the inhalation portion of the breath cycle and a predetermined exhalation pressure delivered during the exhalation portion of the breath cycle, the predetermined exhalation pressure being lower than the predetermined inhalation pressure.
10 . A method according to claim 1 , wherein:
breathing gas is delivered toward the patient over a plurality of breath cycles, each breath cycle including an inhalation portion and an exhalation portion;
the first pressure comprises a first predetermined inhalation pressure delivered during the inhalation portion of the breath cycle; and
the second pressure comprises a second predetermined inhalation pressure delivered during the inhalation portion of the breath cycle and a second predetermined exhalation pressure delivered during the exhalation portion of the breath cycle, the second predetermined inhalation pressure being greater than both the first predetermined inhalation pressure and the second predetermined exhalation pressure.
11 . An apparatus for providing positive airway pressure treatment, the apparatus comprising:
an event detection device operable to detect sleep respiratory events associated with a patient;
a gas delivery apparatus connected to the event detection device operable to deliver breathing gas toward the patient; and
a controller operable to automatically trigger a ramp function in response to the detection of one or more sleep respiratory events by the event detection device, wherein triggering the ramp function comprises controlling the gas delivery apparatus to increase the pressure of the breathing gas delivered toward the patient to a second pressure at a predetermined rate.
12 . An apparatus according to claim 11 , wherein:
the first pressure comprises a comfort pressure suitable to allow the patient to fall asleep; and
the second pressure comprises an effective pressure suitable to resist respiratory events.
13 . An apparatus according to claim 11 , wherein the ramp function gradually and smoothly increases the pressure of the breathing gas from the first pressure to the second pressure.
14 . An apparatus according to claim 11 , wherein the ramp function increases the pressure of the breathing gas from the first pressure to the second pressure in a stepped manner.
15 . An apparatus according to claim 11 , wherein the one or more sleep respiratory events are selected from the group consisting of apnea, hypopnea, snoring, flow limitation, and combinations thereof.
16 . An apparatus according to claim 11 , further comprising an accumulator operable to assign weights to respiratory events and determine a weighted sum of respiratory events; and
wherein the controller is operable to automatically trigger the ramp function if a weighted sum of the one or more detected respiratory events exceeds a predetermined threshold.
17 . An apparatus according to claim 11 , wherein the ramp function increases the pressure of the breathing gas at a rate of between about 1 cm H 2 O per minute and about 5 cm H 2 O per minute.
18 . An apparatus according to claim 11 , wherein:
the gas delivery apparatus is operable to deliver breathing gas toward the patient over a plurality of breath cycles, each breath cycle including an inhalation portion and an exhalation portion; and
the second pressure comprises a single positive pressure level during both inhalation and exhalation phases of the breath cycle.
19 . An apparatus according to claim 11 , wherein:
the gas delivery apparatus is operable to deliver breathing gas toward the patient over a plurality of breath cycles, each breath cycle including an inhalation portion and an exhalation portion; and
the second pressure comprises a predetermined inhalation pressure delivered during the inhalation portion of the breath cycle and a predetermined exhalation pressure delivered during the exhalation portion of the breath cycle, the predetermined exhalation pressure being lower than the predetermined inhalation pressure.
20 . An apparatus for providing positive airway pressure treatment, the apparatus comprising:
a gas delivery apparatus operable to deliver breathing gas toward a patient,
a controller communicatively coupled to the gas delivery apparatus and operable to:
receive data indicating one or more detected sleep respiratory events associated with the patient; and
automatically trigger a ramp function in response to receiving the data indicating one or more detected sleep respiratory events, wherein triggering the ramp function comprises controlling the gas delivery apparatus to increase the pressure of the breathing gas delivered toward the patient to a second pressure at a predetermined rate.
21 . An apparatus according to claim 20 , wherein:
the first pressure comprises a comfort pressure suitable to allow the patient to fall asleep; and
the second pressure comprises an effective pressure suitable to resist respiratory events.
22 . An apparatus according to claim 20 , wherein the ramp function gradually and smoothly increases the pressure of the breathing gas from the first pressure to the second pressure.
23 . An apparatus according to claim 20 , wherein the ramp function increases the pressure of the breathing gas from the first pressure to the second pressure in a stepped manner.
24 . An apparatus according to claim 20 , wherein the one or more detected sleep respiratory events are selected from the group consisting of apnea, hypopnea, snoring, flow limitation, and combinations thereof.
25 . An apparatus according to claim 20 , further comprising an accumulator operable to assign weights to respiratory events and determine a weighted sum of respiratory events; and
wherein the controller is operable to automatically trigger the ramp function if a weighted sum of the one or more detected respiratory events exceeds a predetermined threshold.