Figure 5. Forest plot showing relative risk (RR) of all-cause mortality with quadripolar lead (QL) and bipolar lead (BL) at follow-up. The use of QL results in a 44 % reduction (relative risk 0.56; 95% CI: 0.38-0.81, p=0.002) in all-cause mortality when compared with BL. M-H: Mentel-Haenszel.