VOCSN vhome AVAPS ST Settings Translation
The equivalent VOCSN vhome ventilator settings for your Philips EVO configuration are: Mode = AVAPS ST, Target Tidal Volume = 350 mL, IPAP Min = 18 cmH₂O, IPAP Max = 30 cmH₂O, EPAP = 8 cmH₂O, Backup Rate = 14 breaths/minute, and Inspiratory Time = 1.4 seconds.
Direct Settings Translation
Both the Philips EVO and VOCSN vhome ventilators utilize AVAPS (Average Volume Assured Pressure Support) technology, which automatically adjusts inspiratory pressure between set limits to deliver a target tidal volume 1. This means your settings translate directly without modification:
Core Parameters (Direct Transfer):
- Mode: AVAPS ST (identical nomenclature on both devices)
- Target Tidal Volume: 350 mL
- IPAP Minimum: 18 cmH₂O
- IPAP Maximum: 30 cmH₂O (within guideline-recommended maximum of 30 cmH₂O for patients ≥12 years) 1
- EPAP: 8 cmH₂O
- Backup Rate: 14 breaths/minute
- Inspiratory Time: 1.4 seconds
Verification of Settings Against Guidelines
Your current settings align well with established NPPV guidelines 1:
Pressure Support Range: Your IPAP range of 18-30 cmH₂O with EPAP 8 cmH₂O provides a pressure support window of 10-22 cmH₂O, which falls within the recommended 4-20 cmH₂O range 1.
Backup Rate: The rate of 14 breaths/minute is appropriate, as guidelines recommend setting the backup rate equal to or slightly less than the spontaneous sleeping respiratory rate (minimum 10 bpm) 1.
Inspiratory Time: Your 1.4-second inspiratory time is appropriate for a rate of 14 breaths/minute. At this rate, the cycle time is 4.3 seconds (60/14), making your inspiratory time approximately 33% of the cycle time, which falls within the recommended 30-40% range 1. This provides an I:E ratio of approximately 1:2.1, which is physiologically appropriate 1.
Clinical Considerations for AVAPS Mode
AVAPS mode has demonstrated equivalent efficacy to traditional BiPAP S/T in multiple studies 2, 3, 4, 5. The key advantage is that the ventilator automatically adjusts pressure support to maintain your target tidal volume of 350 mL, compensating for changes in respiratory mechanics, leak, or patient effort 1.
Common Pitfall: Ensure the IPAP minimum is set high enough above EPAP (your 10 cmH₂O difference is adequate) to provide meaningful pressure support. The minimum recommended pressure support is 4 cmH₂O 1.
Monitoring: After transitioning to the VOCSN device, verify that the ventilator is achieving the target tidal volume without consistently hitting either the IPAP minimum or maximum limits. If the device frequently operates at IPAP max (30 cmH₂O), this suggests inadequate ventilatory support and may require adjustment of the target tidal volume or pressure limits.
Device-Specific Settings to Configure
On the VOCSN vhome, you may also need to adjust:
- Rise Time: Set for patient comfort and synchrony (typically medium setting initially)
- Trigger Sensitivity: Adjust based on patient effort and to minimize auto-triggering
- Cycle Sensitivity: Fine-tune for optimal patient-ventilator synchrony 1
These parameters should be optimized based on patient comfort and ventilator data showing good synchrony, though they are not part of the core prescription settings 1.