Prognostic Influence of Lung Compliance in Patients with Cardiogenic Shock and Invasive Mechanical Ventilation.

Abstract

Background: There is limited data regarding the influence of lung compliance on the outcome of patients with cardiogenic shock (CS). Thus, a registry study was conducted to assess the prognostic influence of lung compliance in invasively ventilated patients with CS.

Methods: Hospital records for consecutive invasively ventilated CS-patients from June 2019 to May 2021 were collected into a prospective registry. Our study evaluated the prognostic influence of lung compliance on 30-day all-cause mortality. Statistical analyses comprised t-tests, analysis of variance (ANOVA), Kruskal-Wallis-tests, Spearman's correlation, Kaplan-Meier survival analyses, and Cox regression.

Results: A total of 141 patients with CS requiring invasive mechanical ventilation were included. Stratification by quartiles revealed that patients with the lowest lung compliance (≤23.8 mL/cmH₂O) experienced the highest mortality rates (77.1% vs. 66.7% vs. 48.6% vs. 51.4%; log-rank p = 0.018) both overall and among the subgroup of CS-patients with cardiac arrest (80% vs. 74% vs. 53% vs. 59%; log-rank p = 0.037). After stratifying by the median, patients with lung compliance <30.4 mL/cmH₂O demonstrated a significantly higher 30-day all-cause mortality compared to those above this threshold (71.8% vs. 50.0%; log-rank p = 0.007) for both the overall cohort and the cardiac arrest subgroup (77.2% vs. 55.9%; log-rank p = 0.008). Multivariable adjustment confirmed that lung compliance <30.4 mL/cmH₂O was significantly associated with increased 30-day all-cause mortality in the entire cohort (hazard ratio [HR] = 1.698; 95% CI 1.085-2.659; p = 0.021). Notably, this association was not significant in CS-patients with cardiac arrest (HR = 1.523; 95% CI 0.952-2.438; p = 0.080). Additionally, those with lung compliance below the median experienced fewer ventilator-free days (p = 0.003).

Conclusions: In invasively ventilated CS-patients, low lung compliance was associated with higher all-cause mortality and fewer ventilator-free days at 30 days.

Clinical trial registration: NCT05575856, https://clinicaltrials.gov/study/NCT05575856.