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Related Concept Videos

Measurement of Blood Pressure01:17

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Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a...
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The movement of blood in a human body, commonly referred to as blood flow, is determined by the volume of blood that traverses a certain section of the bodily system per unit time. It is the rhythmic contraction of the heart's ventricles that primarily instigates this movement. As the ventricles contract, blood is forced into the prominent arteries, which then flow from areas of greater pressure to lower pressure areas. This movement continues into smaller arteries and arterioles and...
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Area of Science:

  • Cardiology
  • Hypertension Management
  • Clinical Measurement

Background:

  • The non-invasive measurement of blood pressure (BP) is crucial for managing hypertension.
  • Traditionally, one arm is designated as the reference arm for follow-up BP measurements.
  • The reproducibility of this reference arm assignment has not been thoroughly evaluated.

Purpose of the Study:

  • To assess the reproducibility of assigning the reference arm based on higher blood pressure (BP) in hypertensive patients.
  • To determine the intravisit and intervisit agreement for this reference arm assignment method.

Main Methods:

  • Simultaneous BP measurements were taken on both arms of 313 hypertensive patients using a validated double-cuff device.
  • Measurements were conducted across two visits, with each visit including two sets of three readings.
  • The arm with the higher BP (≥1 mmHg difference) was designated as the reference arm for each set of readings.

Main Results:

  • Intravisit agreement for reference arm assignment was moderate (κ = 0.60 at visit 1, κ = 0.45 at visit 2).
  • Intervisit agreement was weak (κ = 0.25), with 36.8% of patients changing their reference arm between visits.
  • A significant proportion of patients (21.8% to 29.1%) switched reference arms within the same visit based on different reading sets.

Conclusions:

  • The reproducibility of assigning a reference arm based on higher BP is weak to moderate.
  • Current methods for reference arm assignment in hypertensive patients are not definitive.
  • Individualized and repeated assessment of the reference arm is recommended for accurate hypertension management.