"The American Heart Association (AHA) recommends that the bladder width be 
40% of the circumference of the limb or 20% wider than the limb diameter."  

Kirkendall WM, Feinleib M, Freis ED, Mark AL. Recommendations for human 
blood pressure determinations
by sphygmomanometers. Subcommittee of the AHA Postgraduate Education 
Committee. Circulation.
1980; 62(5): 1146A–1155A

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