Hawksley Random-Zero (Garrow Muddler)
Device Name:
Random Zero and Garrow Muddler
Manufacturer:
Hawksley & Sons Ltd., 25 Marlborough Road, Lancing Business Park, Lancing, Sussex BN15 8TN, UNITED KINGDOM.
Measuring functions:
Blood Pressure and PR
Primary Client Use:
Intended for professional use
Measurement Site:
Upper Arm
Measurement Occurrence:
Single measurements only
Availability:
Obsolete
Description:
The Hawksley Random-Zero (Garrow Muddler) is a desk (tabletop) manually-operated mercury sphygmomanometer. Blood pressure measurements are taken from the upper arm. It is intended for professional use. This device is now obsolete.
Assessment:
The technology used in the Hawksley Random-Zero (Garrow Muddler), to measure blood pressure, has failed in a clinical validation study, in a general population, according to a recognised standard protocol, as published in a peer-reviewed publication.
Recommendations:
Accuracy AssessmentRecommendationBasis
BP Medaval None This is a manual device.
Validation Publications:

O'Brien E, Mee F, Atkins N, O'Malley K. Inaccuracy of the Hawksley random zero sphygmomanometer. Lancet. 1990 Dec 15;336(8729):1465-8. PMID: 1979092.

SP10:1987 - Fail General population (Note: Failed DBP)

BHS:1990 - Fail (C/D) General population

Relevant Publications:

Beevers DG, Bloxham CA, Backhouse CI, Lim CC, Watson RD. The Remler M2000 semi-automatic blood pressure recorder. Br Heart J. 1979 Sep;42(3):366. PMID: 508463. Available from: PMC482165. Letter.

Measurements from the Hawksley Random-Zero (Garrow Muddler) UK 77075 Version are compared to those from the Remler M2000, though not in a formal validation.

Zezulka AV, Sloan PJ, Davies P, Beevers DG. Clinical evaluation of the Infrasonde D4000 blood pressure monitor. Postgrad Med J. 1985 Apr;61(714):321-3. PMID: 4022862. Available from: PMC2418217.

The publication describes the Hawksley Random-Zero (Garrow Muddler) being used as a validation control device.

Jamieson MJ, Webster J, Witte K, Huggins MM, MacDonald TM, de Beaux A, Petrie JC. An evaluation of the A&D UA-751 semi-automated cuff-oscillometric sphygmomanometer. J Hypertens. 1990 Apr;8(4):377-81. PMID: 2160495.

The publication describes the Hawksley Random-Zero (Garrow Muddler) being used as a reference device for comparison with the A&D UA-751.

Eriksson M, Carlberg B, Jansson JH. Comparison of blood pressure measurements between an automated oscillometric device and a Hawksley random-zero sphygmomanometer in the northern Sweden MONICA study. Blood Press Monit. 2012 Aug;17(4):164-70. doi: 10.1097/MBP.0b013e328356ef58. PMID: 22781634.

Measurements from the Hawksley Random-Zero (Garrow Muddler) are compared to those from the Omron M7, though not in a formal validation.

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