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Person—blood pressure (systolic) (measured), millimetres of mercury NN[N]

Identifying and definitional attributes

Metadata item type:Help on this termData Element
Short name:Help on this termBlood pressure—systolic (measured)
METeOR identifier:Help on this term270073
Registration status:Help on this termHealth, Standard 01/03/2005
Definition:Help on this termThe person's systolic blood pressure, measured in millimetres of mercury (mmHg).
Data Element Concept:Person—blood pressure (systolic)

Value domain attributes

Representational attributes

Representation class:Help on this termTotal
Data type:Help on this termNumber
Format:Help on this termNN[N]
Maximum character length:Help on this term3
Supplementary values:Help on this term
ValueMeaning
999Not stated/inadequately described
Unit of measure:Help on this termMillimetre of mercury (mmHg)

Data element attributes

Collection and usage attributes

Guide for use:Help on this termFor recording the systolic reading, use phase I Korotkoff (the first appearance of sound). If Blood pressure - systolic is not collected or not able to be collected, code 999.
Collection methods:Help on this term

Measurement protocol for resting blood pressure:

The systolic blood pressure is one component of a routine blood pressure measurement (i.e. systolic/diastolic) and reflects the maximum pressure to which the arteries are exposed.

  • The patient should be relaxed and seated, preferably for several minutes, (at least 5 minutes). Ideally, patients should not take caffeine-containing beverages or smoke for two hours before blood pressure is measured.
  • Ideally, patients should not exercise within half an hour of the measurement being taken (National Nutrition Survey User's Guide).
  • Use a mercury sphygmomanometer. All other sphygmomanometers should be calibrated regularly against mercury sphygmomanometers to ensure accuracy.
  • Bladder length should be at least 80%, and width at least 40% of the circumference of the mid-upper arm. If the Velcro on the cuff is not totally attached, the cuff is probably too small.
  • Wrap cuff snugly around upper arm, with the centre of the bladder of the cuff positioned over the brachial artery and the lower border of the cuff about 2 cm above the bend of the elbow.
  • Ensure cuff is at heart level, whatever the position of the patient.
  • Palpate the radial pulse of the arm in which the blood pressure is being measured.
  • Inflate cuff to the pressure at which the radial pulse disappears and note this value. Deflate cuff, wait 30 seconds, and then inflate cuff to 30 mm Hg above the pressure at which the radial pulse disappeared.
  • Deflate the cuff at a rate of 2-3 mm Hg/beat (2-3 mm Hg/sec) or less.
  • For recording the systolic reading, use phase I Korotkoff (the first appearance of sound). Wait 30 seconds before repeating the procedure in the same arm. Average the readings. If the first two readings differ by more than 6 mm Hg systolic or if initial readings are high, take several readings after five minutes of quiet rest.
Comments:Help on this term

The pressure head is the height difference a pressure can raise a fluid's equilibrium level above the surface subjected to pressure. (Blood pressure is usually measured as a head of Mercury, and this is the unit of measure nominated for this metadata item.)

The current (2002) definition of hypertension is based on the level of blood pressure above which treatment is recommended, and this depends on the presence of other risk factors, e.g. age, diabetes etc. (NHF 1999 Guide to Management of Hypertension).

Source and reference attributes

Submitting organisation:Help on this term

Cardiovascular Data Working Group

National Diabetes Data Working Group

Origin:Help on this term

The National Heart Foundation Blood Pressure Advisory Committee's 'Guidelines for the Management of Hypertension - 1999' which are largely based on World Health Organization Recommendations. (Guidelines Subcommittee of the WHO-SH: 1999 WHO-ISH guidelines for management of hypertension. J Hypertension 1999; 17:151-83).

Australian Bureau of Statistics 1998. National Nutrition Survey User's Guide 1995. Cat. No. 4801.0. Canberra: ABS. (p. 20).

National Diabetes Outcomes Quality Review Initiative (NDOQRIN) data dictionary.

Reference documents:Help on this term

'Guidelines for the Management of Hypertension - 1999' largely based on World Health Organization Recommendations. (Guidelines Subcommittee of the WHO) J Hypertension 1999; 17: 151-83.).

Diabetes Control and Complications Trial: DCCT New England Journal of Medicine, 329(14), September 30, 1993.

UKPDS 38 Tight blood pressure control and risk of macrovascular and microvascular complications in type 2 diabetes: UK Prospective Diabetes Study Group. British Medical Journal (1998); 317: 703-713.

Relational attributes

Related metadata references:Help on this term

Supersedes Blood pressure - systolic measured, version 1, DE, NHDD, NHIMG, Superseded 01/03/2005 .pdf (25.9 KB)

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