Proton pump inhibitors versus H2-antagonists: a meta-analysis of their efficacy in treating bleeding peptic ulcer.

PURPOSE: To evaluate whether proton pump inhibitors are more effective than H2-antagonists (H2-A) for the treatment of bleeding peptic ulcer.

DATA SOURCES: PubMed database until January 2000.

STUDY SELECTION: Comparative randomized trials of proton pump inhibitors (omeprazole, lansoprazole, or pantoprazole) vs. H2-A (cimetidine, ranitidine or famotidine).

DATA EXTRACTION: Meta-analysis combining the odds ratios (OR) of the individual studies in a global OR (Peto method). OUTCOMES EVALUATED: Persistent or recurrent bleeding, need for surgery, or mortality.

DATA SYNTHESIS: Eleven studies fulfilled the inclusion criteria and contained data for at least one of the planned comparisons. Persistent or recurrent bleeding was reported in 6.7% (95% CI: 4.9-8.6%) of the patients treated with proton pump inhibitors, and in 13.4% (95% CI: 10.8-16%) of those treated with H2-A (OR 0.4; 95% CI: 0.27-0.59) (chi2-homogeneity test, 18; P=0.09). Surgery was needed in 5.2% (95% CI: 3.4-6.9%) of the patients treated with proton pump inhibitors, and in 6.9% (95% CI: 4.9-8.9%) of the patients treated with H2-A (OR 0.7; 95% CI: 0.43-1.13). Respective percentages for mortality were 1.6% (95% CI: 0.9-2.9%) and 2.2% (95% CI: 1.3-3.7%) (OR 0.69; 95% CI: 0.31-1.57). SUB-ANALYSIS: Five studies evaluated the effect of both therapies given in bolus injections on persistent or recurrent bleeding rate, which was 6% (95% CI: 3.6-8.3%) and 8.1% (95% CI: 5.3-10.9%), respectively (OR, 0.57; 95% CI: 0.31-1.05). Persistent or recurrent bleeding in high risk patients (Forrest Ia, Ib and IIa) occurred in 13.2% (95% CI: 7.9-8%) of the patients treated with proton pump inhibitors and in 34.5% (27-42%) of those treated with H2-A (OR 0.28; 95% CI: 0.16-0.48). In patients not having endoscopic therapy, persistent or recurrent bleeding was reported, respectively, in 4.3% (95% CI: 2.7-6.7%) and in 12% (95% CI: 8.7-15%) (OR 0.24; 95% CI: 0.13-0.43). Less marked differences were observed in patients having adjunct endoscopic therapy: 10.3% (95% CI: 6.7-13.8%) and 15.2% (11.1-19.3%) (OR 0.59; 95% CI: 0.36-0.97). Moreover, the significance disappeared in this group when a single outlier study was excluded.

CONCLUSIONS: Proton pump inhibitors are more effective than H2-A in preventing persistent or recurrent bleeding from peptic ulcer, although this advantage seems to be more evident in patients not having adjunct sclerosis therapy. This beneficial effect seems to be similar or even more marked in patients with Forrest Ia, Ib or IIa ulcers. However, proton pump inhibitors are not more effective than H2-A for reducing surgery or mortality rates. Nevertheless, the data are too scarce and heterogeneous to draw definitive conclusions, and further comparative trials are clearly warranted.