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Information: European Society of Hypertension recommendations for conventional, ambulatory and home blood pressure measurement
E O'Brien, R Asmar, L Beilin, Y Imai, JM Mallion, G Mancia, T Mengden, M Myers, P Padfield, P Palatini, G Parati, T Pickering, J Redon, J Staessen, G Stergiou & P Verdecchia. Journal of Hypertension 2003, Vol 21, 5: 821-848
Extract from NICE Hypertension Guideline Update CG127 2011: http://www.nice.org.uk/nicemedia/live/13561/56008/56008.pdf
Because automated devices may not measure blood pressure accurately if there is pulse irregularity (for example, due to atrial fibrillation), palpate the radial or brachial pulse before measuring blood pressure. If pulse irregularity is present, measure blood pressure manually using direct auscultation over the brachial artery. [new 2011]
Stergiou GS, Kollias A, Destounis A, Tzamouranis D. Automated blood pressure measurement in atrial fibrillation: a systematic review and meta-analysis. J Hypertens. 2013 Jan;31(1):215-6. doi: 10.1097/HJH.0b013e32835ae9b3. PubMed PMID: 23221943.