@oshadaviduranga2638 hi,nice to hear from SriLanka In Airway Pressure Release Ventilation (APRV) mode, the respiratory rate is not directly set in the traditional sense as it is in other ventilator modes like Volume-Controlled or Pressure-Controlled Ventilation. APRV primarily focuses on two time settings-T-high (time at high pressure, or the inspiratory phase) and T-low (time at low pressure, or the expiratory phase). How Respiratory Rate is Managed in APRV: T-high (Time at high pressure, P-high): Represents the duration the airway is held at a higher pressure to facilitate alveolar recruitment and oxygenation. It usually lasts longer than the expiratory phase. Typical range: 4-6 seconds, but can be adjusted based on the patient's needs. T-low (Time at low pressure, P-low): Represents the brief time allowed for exhalation, releasing pressure from the lungs. This setting influences CO₂ elimination and provides a brief period for exhalation before quickly returning to the high pressure. Typical range: 0.2-0.8 seconds (this is usually short to avoid full lung collapse and maintain alveolar recruitment). Calculating Respiratory Rate in APRV: The "effective" respiratory rate (RR) in APRV is determined by the combination of T-high and T-low settings. The equation for the respiratory rate is: 𝑅𝑅=60/ 𝑇ℎ𝑖𝑔ℎ+𝑇𝑙𝑜w For example: If T-high = 5 seconds and T-low = 0.5 seconds, the cycle time is 5.5 seconds. so 60/5.5 This results in an approximate respiratory rate of 10.9 breaths per minute. by varying Thigh and T low u can control the rate BILEVEL refers to portable non invasive vents , here we set IPAP and EPAP the pt breathes spontaneously and we cannot set a RR , only a backup RR can be set which comes into play if pt"s respiration fails , sometimes BILEVEL also refers to PSV in intubated pts on vent , here again we cannot set RR hope this answers your q
Sir Am listening to this from Sri Lanka . Could you please explain wether we can set a respiratory rate in the modes of Bilevel and APRV.Many thankz
@oshadaviduranga2638 hi,nice to hear from SriLanka
In Airway Pressure Release Ventilation (APRV) mode, the respiratory rate is not directly set in the traditional sense as it is in other ventilator modes like Volume-Controlled or Pressure-Controlled Ventilation. APRV primarily focuses on two time settings-T-high (time at high pressure, or the inspiratory phase) and T-low (time at low pressure, or the expiratory phase).
How Respiratory Rate is Managed in APRV:
T-high (Time at high pressure, P-high):
Represents the duration the airway is held at a higher pressure to facilitate alveolar recruitment and oxygenation.
It usually lasts longer than the expiratory phase.
Typical range: 4-6 seconds, but can be adjusted based on the patient's needs.
T-low (Time at low pressure, P-low):
Represents the brief time allowed for exhalation, releasing pressure from the lungs.
This setting influences CO₂ elimination and provides a brief period for exhalation before quickly returning to the high pressure.
Typical range: 0.2-0.8 seconds (this is usually short to avoid full lung collapse and maintain alveolar recruitment).
Calculating Respiratory Rate in APRV:
The "effective" respiratory rate (RR) in APRV is determined by the combination of T-high and T-low settings. The equation for the respiratory rate is:
𝑅𝑅=60/ 𝑇ℎ𝑖𝑔ℎ+𝑇𝑙𝑜w
For example:
If T-high = 5 seconds and T-low = 0.5 seconds, the cycle time is 5.5 seconds. so 60/5.5
This results in an approximate respiratory rate of 10.9 breaths per minute.
by varying Thigh and T low u can control the rate
BILEVEL refers to portable non invasive vents , here we set IPAP and EPAP
the pt breathes spontaneously and we cannot set a RR , only a backup RR can be set which comes into play if pt"s respiration fails , sometimes BILEVEL also refers to PSV in intubated pts on vent , here again we cannot set RR
hope this answers your q
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