# The prognostic value of thromboelastography MA/R ratio in predicting mortality in acute respiratory failure patients

## TL;DR

This study shows that a low thromboelastography MA/R ratio at ICU admission is strongly linked to higher mortality in patients with acute respiratory failure.

## Contribution

The study demonstrates that the MA/R ratio is an independent predictor of mortality in acute respiratory failure patients.

## Key findings

- Patients in the lowest MA/R quartile had significantly higher 28-day mortality (59.8%) compared to others.
- MA/R ratio was identified as an independent mortality predictor with a threshold of 9.7 indicating increased risk.
- Kaplan-Meier analysis showed shorter survival times for patients in the lowest MA/R quartile.

## Abstract

Thromboelastography (TEG) MA/R ratio reflects coagulation status and thrombus strength. This study evaluated its prognostic value in acute respiratory failure (ARF). A retrospective analysis of 371 ARF patients admitted to the ICU, stratified by MA/R quartiles. Outcomes included 28-day mortality, deep vein thrombosis (DVT), mechanical ventilation duration, and ICU stay. Cox proportional hazards regression model was used to assess hazard ratios, restricted cubic spline was employed to evaluate the nonlinear relationship between MA/R and mortality, and Kaplan-Meier analysis was conducted to compare survival time across different MA/R groups. Patients in the lowest MA/R quartile (Q1) had significantly higher 28-day mortality (59.8% vs. 22.1–28.0% in Q2-Q4; P < 0.001) and elevated inflammatory markers (cytokines, procalcitonin, lactate, creatinine; P < 0.05). DVT incidence, ventilation duration, and ICU stay did not differ between groups. Multivariate analysis identified MA/R as an independent mortality predictor (P < 0.05), with mortality risk sharply increasing below a threshold of 9.7. Kaplan-Meier curves showed shorter survival in Q1 (P < 0.001). The MA/R ratio measured at ICU admission can rapidly identify coagulation dysfunction in patients with acute respiratory failure, with a low MA/R ratio being a strong indicator of poor prognosis.