Fig. 2

Forest plots showing the benefits associated with presence of LVCR. They include the same eleven studies, but in the left panel a fixed-effect analysis was used and in the right panel a random-effect analysis. Individual studies (identified by first author and reference number) are shown on the left, and their corresponding odds ratios (and confidence intervals) on the right. The area of each square is proportional to the weight in the final result. The measure effect is plotted as a diamond, and its lateral margins indicate confidence intervals for this estimate. Rocchi G and Lancellotti P studies used exercise, all the others dobutamine as stressor