Is the ARMA Trial the Same as ARDSNet?
Yes, the ARMA trial is essentially synonymous with the ARDSNet low tidal volume trial—they refer to the same landmark study that established lung-protective ventilation as the standard of care for ARDS. 1, 2, 3
Understanding the Terminology
The confusion arises from naming conventions:
- ARMA stands for "ARDS Network Randomized Controlled Trial" and is the formal name of the specific trial
- ARDSNet refers to the ARDS Clinical Trials Network, which is the research consortium that conducted the ARMA trial
- In clinical practice, people often use "ARDSNet protocol" or "ARDSNet strategy" to refer to the lung-protective ventilation approach validated by the ARMA trial
What the Trial Established
The ARMA/ARDSNet trial (published in 2000) compared two ventilation strategies 2, 3:
Low tidal volume arm (the winner):
- 6 mL/kg predicted body weight
- Plateau pressure ≤ 30 cm H₂O
- Reduced mortality compared to traditional ventilation
High tidal volume arm (control):
- 12 mL/kg predicted body weight
- Plateau pressure ≤ 50 cm H₂O
Clinical Implementation
When clinicians say "use the ARDSNet protocol," they mean implementing the lung-protective strategy from the ARMA trial 1, 2:
- Target tidal volumes of 6-8 mL/kg predicted body weight
- Keep plateau pressure ≤ 30 cm H₂O
- Accept permissive hypercapnia if needed
- This remains the foundation of ARDS ventilation management
Common Pitfall
Don't confuse the trial name with the protocol itself. The ARMA trial was a one-time study, but the "ARDSNet protocol" or "ARDSNet strategy" refers to the ongoing clinical application of its findings. The protocol details remain "widely available" 1 and continue to guide current practice, as confirmed in recent 2017 and 2024 guidelines 2, 4, 3.
The terms are used interchangeably in clinical conversation, but technically ARMA is the trial and ARDSNet is both the network that conducted it and the shorthand for the resulting ventilation protocol.