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Assessment of blood pressure in brachial artery(two-step method)01:23

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Measuring blood pressure is a fundamental skill in healthcare that aids in diagnosing and monitoring hypertension and other cardiovascular conditions. An aneroid sphygmomanometer, commonly used in clinical settings, offers a manual and precise method for blood pressure measurement. The technique for using this instrument involves specific steps that must be carefully executed to ensure accuracy. The following detailed description outlines a two-step technique for assessing blood pressure using...
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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
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[Clinical evaluation of the Pascal dynamic contour tonometer].

M Detry-Morel1, J Jamart, M B Detry

  • 1Cliniques Universitaires Saint Luc, UCL, Bruxelles, Belgique.

Journal Francais D'Ophtalmologie
|April 10, 2007
PubMed
Summary

The Pascal dynamic contour tonometer (DCT) shows good reproducibility for intraocular pressure (IOP) measurement but overestimates IOP compared to applanation tonometry (APL). DCT is independent of central corneal thickness (CCT), unlike APL.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Intraocular pressure (IOP) measurement is crucial for glaucoma diagnosis and management.
  • Corneal properties can influence IOP measurements, necessitating tonometers independent of these factors.

Purpose of the Study:

  • Assess variability of Pascal dynamic contour tonometer (DCT) IOP measurements.
  • Compare DCT with applanation tonometry (APL) and evaluate correlations with central corneal thickness (CCT).
  • Analyze ocular pulse amplitude (OPA) variability and its clinical correlations.

Main Methods:

  • Prospective study including normal subjects, ocular hypertension, and glaucoma patients.
  • DCT and APL IOP measurements were taken, with varying sequences and observers.
  • DCT measurements with quality levels 1-3 were analyzed.

Main Results:

  • DCT IOP measurements were reproducible with slight overestimation (mean 2.0 mmHg) compared to APL.
  • DCT was independent of CCT, particularly in thin corneas, unlike APL.
  • OPA variability was high and correlated with blood pressure, cardiac frequency, and glaucoma severity.

Conclusions:

  • DCT and APL IOP measurements correlate well and are reproducible.
  • DCT is advantageous in thin corneas due to CCT independence.
  • OPA requires careful clinical interpretation due to high variability and numerous correlations.