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Titolo:
PROPERTIES OF THE RANDOM ZERO SPHYGMOMANOMETER
Autore:
KRONMAL RA; RUTAN GH; MANOLIO TA; BORHANI NO;
Indirizzi:
CARDIOVASC HLTH STUDY COORDINATING CTR,1501 4TH AVE,SUITE 2025 SEATTLE WA 98101
Titolo Testata:
Hypertension
fascicolo: 5, volume: 21, anno: 1993,
pagine: 632 - 637
SICI:
0194-911X(1993)21:5<632:POTRZS>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
BLOOD-PRESSURE;
Keywords:
BLOOD PRESSURE MONITORS; RANDOMIZED CONTROLLED TRIALS; BLOOD PRESSURE DETERMINATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
R.A. Kronmal et al., "PROPERTIES OF THE RANDOM ZERO SPHYGMOMANOMETER", Hypertension, 21(5), 1993, pp. 632-637

Abstract

The random zero sphygmomanometer is widely used in studies involving blood pressure measurement because it is believed to eliminate digit preference and reduce measurement error. We performed blood pressure measurements sequentially using random zero and standard sphygmomanometers in random order in 1,356 participants in the Cardiovascular Health Study. Despite adherence to the manufacturer's instructions, we observed a substantially nonuniform distribution of zero levels generated bythe random zero sphygmomanometer and a disturbing correlation betweenthe zero level and blood pressures taken with the standard sphygmomanometer. With the random zero device, the pooled estimated slopes for the regression of standard systolic and diastolic pressures on the zerolevel were -0.71 and -0.17, respectively (both p < 0.0001). The only plausible explanation for this relation between the random zero deviceand the standard device is that by some unknown mechanism the subject's blood pressure is influencing the zero level. Systolic and diastolic blood pressures measured with the random zero device were, respectively, 1.65 and 1.84 mm Hg lower (both p < 0.0001) than standard blood pressures. Digit preference was detectable in the uncorrected blood pressure and zero level measured with the random zero device but was eliminated after calculation of the corrected blood pressure. For most epidemiological studies, the random zero sphygmomanometer offers no significant advantage over the standard sphygmomanometer. It may still be useful in those epidemiological studies and clinical trials where blinding is important.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 13:40:40