A tale of two trials: a comparison of the post-acute coronary syndrome lipid-lowering trials A to Z and PROVE IT-TIMI 22

Circulation
Stephen D WiviottEugene Braunwald

Abstract

The Aggrastat to Zocor (A to Z) and Pravastatin or Atorvastatin Evaluation and Infection Therapy (PROVE IT) trials compared intensive and moderate statin therapy after acute coronary syndromes, with seemingly disparate results. We analyzed the design, implementation, and results of the two trials in an attempt to clarify the effects of early intensive statin therapy. Study design, end points, and definitions were compared. In each trial, comparisons were made between intensive and moderate arms for both trials' primary end points and death/myocardial infarction. Analyses were performed over various time points: at the end of the trials, < or =4 months, and >4 months. Subjects in A to Z had higher-risk demographics. More PROVE IT subjects were enrolled in the United States and underwent prerandomization revascularization. The low-density lipoprotein (LDL) difference was greater in A to Z than in PROVE IT early (< or =4 months) but less late. Significant C-reactive protein reduction was earlier in PROVE IT. With common end points, event rates were higher in A to Z, and early favorable separation of event curves was seen in PROVE IT but not in A to Z. Clinical end point rates and reductions were similar in both trials after 4 mont...Continue Reading

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