Looking at patient data before or after 2001, investigators found the rates of most complications were consistent over time. However, rates of pulmonary edema decreased in the post-2001 period.
Multivariate analysis of these findings revealed 10 predictors of adverse cardiac events. Those included five general factors, including previous cardiac events or arrhythmia, four lesion-specific variables including pulmonary hypertension and coronary artery disease, and one process of care variable: late pregnancy assessment.
Only 4 of those 10 factors were included in the original CARPREG index, investigators noted.
In CARPREG II, each of the 10 factors is weighted with 1-3 points, depending on risk. For example, history of prior cardiac events was associated with a higher odds ratio, and so was assigned 3 points.