Figure 2. Cumulative Mortality Through 90 Days and 1-Year Follow-up, Classified by Normal and Low Thermodilution (Td) and Estimated Oxygen Uptake Fick (eFick) Cardiac Index Categories.

A, Shown are the cumulative proportions of patients who had died by 90 days and 1 year after catheterization, stratified by cardiac index classification in the Veterans Affairs Clinical Assessment, Reporting, and Tracking (VA CART) cohort. All patients who survived had at least 1 year of follow-up. Patients with concordantly low cardiac index estimates by both Td and eFick had the highest mortality risk. Those with either normal cardiac index by both methods or isolated low eFick cardiac index had the lowest risk. The incidence of death was intermediate for patients with low cardiac index by Td but normal eFick cardiac index. B, Shown are the corresponding Vanderbilt cohort results. The findings are qualitatively equivalent (eg, isolated low Td was associated with worse prognosis than isolated low eFick). However, in this cohort, there was marginally increased risk of death for those with isolated low eFick cardiac index relative to normal cardiac index by both methods.