Figure 2. Forest plot showing relative risk (RR) of lead deactivation, revision or replacement with quadripolar lead (QL) and bipolar lead (BL) at follow-up. The use of QL results in a 52% reduction (relative risk 0.48; 95% confidence interval [CI]: 0.36-0.64, p=0.00001) when compared with BL. M-H: Mentel-Haenszel.