title: Short-term representatives of daytime and night-time ambulatory blood pressures.
abstract: OBJECTIVE
  To see whether measurements of ambulatory blood pressure during short-term daytime and night-time periods can represent complete daytime and night-time pressures accurately.
  
  
  METHODS
  Short-term measurements would be less uncomfortable for patients, easier to perform and could lead to fewer missing values, outliers or artefacts than full-day measurements, especially when repeated monitorings are required.
  
  
  METHODS
  Ambulatory blood pressure was measured every 15 min for 24 h in 254 subjects with normal or borderline office blood pressure. Each pressure profile included at least 80 valid readings. Mean blood pressures for different 1-, 2-, 3-, 4-, 5- and 6-h spans were calculated and compared with mean daytime and night-time values using paired Student's t-test.
  
  
  RESULTS
  One or two-hour spans of daytime blood pressure poorly represented mean daytime pressure. In contrast, 4-h readings, selected between 1000-2200 h represented daytime blood pressure with good accuracy. Over the total sample, 4-h mean blood pressure readings from 1000-2200 h differed from daytime readings by less than 2 mmHg and 2-h mean readings from 0300-0700 h differed from mean night-time readings by less than 1 mmHg.
  
  
  CONCLUSIONS
  We suggest that 4-h measurements of ambulatory blood pressure during the daytime and 2-h measurements at night (with time spans selected as indicated as above) may be of value.
authors.affiliation: Service de Médecine Interne et de Pathologie Cardiovasculaire, Hôpital Begin, Saint Mandé, France.
authors.forename: X
authors.initials: X
authors.lastname: Chanudet
authors.forename: N P
authors.initials: NP
authors.lastname: Chau
authors.forename: P
authors.initials: P
authors.lastname: Larroque
mesh_terms: D000293:Adolescent; D000328:Adult; D001794:Blood Pressure / Q000502:physiology*; D015924:Blood Pressure Monitors; D002940:Circadian Rhythm / Q000502:physiology*; D006801:Humans; D008297:Male; D012016:Reference Values; D013997:Time Factors