Figure 1.

Prevalence of right ventricular outflow tract obstruction in the setting of cardiac surgery. Forest plot of the 4 included studies with 5 cohorts. The prevalence ranged from 1% to 11%, depending on the studied population. Studies were separated based on whether or not they were performed on a specific population. In the 5 included cohorts with a total of 1122 patients, the overall prevalence was estimated to be 4.0% (confidence interval [CI]: 1%-9%). Significant heterogeneity was observed in the included studies (I² = 85%).