Research Article Cardiac arrhythmias. II. Br Med J 1971; 2 doi: https://doi.org/10.1136/bmj.2.5760.511 (Published 29 May 1971) Cite this as: Br Med J 1971;2:511 Article Related content Metrics Responses Peer review This article has a correction. Please see:Correction - September 12, 1964 This is a PDF-only article. The first page of the PDF of this article appears below.