Fig. 1From: Quantifying the learning curve for pulmonary thromboendarterectomyCUSUM plot depicts learning curve for PTE. Cumulative running sum (CUSUM) of the difference in DHCA (deep hypothermic circulatory arrest) time from the mean value is plotted on the vertical axis vs. case number on the horizontal axis. Two inflection points are seen at 22 and 95 casesBack to article page