A new analysis of 17 studies suggests that a simple breathing measurement called the ventilatory ratio (VR) may help predict death risk in patients with acute respiratory distress syndrome (ARDS). ARDS is a serious lung condition that often requires a ventilator to help patients breathe. Researchers found that higher VR values were linked to a 55% higher risk of death, with a 95% credible interval of 1.27 to 1.96.
However, the evidence is not strong enough to change practice yet. The analysis showed moderate-to-high variation across studies, and the overall certainty of the evidence was rated as low using the GRADE system. This means the link between VR and mortality is uncertain and could change with more research.
No safety concerns were reported in the studies. The ventilatory ratio is a noninvasive measure that can be calculated from standard ventilator settings, so it is easy to obtain. But doctors should not rely on VR alone to make decisions about patient care.
For now, VR is a promising but unproven tool. More prospective studies are needed to confirm whether it adds value to existing measures like the PaO2/FiO2 ratio. Patients and families should discuss any concerns about ARDS treatment with their healthcare team.
