Increased physiologic dead space fraction is associated with mortality after comprehensive stage 2 operation

Area of Science:

• Pediatric Cardiac Surgery
• Critical Care Medicine
• Respiratory Physiology

Background:

• The comprehensive stage 2 operation is a critical intervention for single ventricle cardiac disease.
• Extubation timing after complex pediatric cardiac surgery can significantly influence patient outcomes.
• Predictive markers for mortality in this high-risk population are crucial for clinical decision-making.

Purpose of the Study:

• To evaluate the predictive capability of physiologic dead space fraction for mortality in patients undergoing the comprehensive stage 2 operation.
• To determine the association between extubation timing and post-operative outcomes.
• To identify early indicators of adverse events in this patient cohort.

Main Methods:

• A single-center retrospective observational study of 180 patients undergoing the comprehensive stage 2 operation.
• Patients were categorized into early, standard, and delayed extubation groups.
• Statistical analyses included Fine-Gray models, Youden's J statistic, and logistic regression to assess outcomes and predictive values.

Main Results:

• Delayed extubation was associated with significantly higher rates of mortality, cardiac arrest, stroke, and need for interventions (P < 0.001).
• Physiologic dead space fraction was elevated in the delayed extubation group and in non-survivors, with 0.3 identified as a discriminatory point.
• A 0.1 unit increase in physiologic dead space fraction on post-operative day 1 increased mortality odds by 2.26 times (p < 0.001) and on day 3 by 3.79 times (p = 0.01).

Conclusions:

• Delayed extubation significantly impacts morbidity and mortality in patients after the comprehensive stage 2 operation.
• Elevated physiologic dead space fraction within the first 60 hours post-ICU admission is a strong predictor of increased mortality.
• Physiologic dead space fraction serves as a valuable early warning marker for adverse outcomes in this vulnerable patient group.