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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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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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Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
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When assessing blood pressure (BP), healthcare professionals must consider various factors and potential unexpected outcomes to ensure accurate readings and provide proper patient care. Adhering to these guidelines is essential to achieving the most reliable results.
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Doppler Optical Coherence Tomography of Retinal Circulation
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[Comparison between Goldmann, Icare Pro and Corvis ST tonometry].

P Bañeros-Rojas1, J M Martinez de la Casa2, P Arribas-Pardo1

  • 1Servicio de Oftalmología, Departamento de Glaucoma, Hospital Universitario Clínico San Carlos, Madrid, España; Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSSC), Madrid, Spain.

Archivos De La Sociedad Espanola De Oftalmologia
|May 13, 2014
PubMed
Summary

The Corvis ST (CST) tonometer showed non-significant intraocular pressure (IOP) differences compared to Goldmann applanation tonometry (GAT), unlike the Icare Pro (PRO). Central corneal thickness (CCT) affected all tonometer measurements.

Keywords:
Corvis STGlaucomaGoldmannIntraocular pressurePresión intraocularReboteReboundTonometryTonometría

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Accurate intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.
  • Various tonometry methods exist, each with potential biases and limitations.

Purpose of the Study:

  • To compare IOP measurements obtained from the Corvis ST (CST) non-contact tonometer against established Goldmann applanation tonometry (GAT) and Icare Pro (PRO) rebound tonometer.
  • To evaluate the influence of central corneal thickness (CCT) on IOP readings from these devices.

Main Methods:

  • A study involving 178 eyes of healthy subjects.
  • Randomized IOP measurements using GAT, PRO, and CST.
  • Central corneal thickness (CCT) measured via ultrasound pachymetry.
  • Statistical analysis including Bland-Altman plots to assess agreement.

Main Results:

  • Mean IOP readings were GAT: 15.5 ± 2.8 mmHg, CST: 15.4 ± 2.8 mmHg, and PRO: 14.6 ± 2.3 mmHg.
  • Non-significant differences were found between GAT and CST (0.1 ± 2.2 mmHg, P=.398).
  • Significant differences were observed between GAT and PRO (0.9 ± 1.7 mmHg, P<.001) and between PRO and CST (-0.8 ±-0.7 mmHg, P<.001).
  • A positive correlation between CCT and IOP readings was noted for all three tonometers (GAT: r=0.325, PRO: r=0.385, CST: r=0.428, all P<.001).

Conclusions:

  • The Corvis ST tonometer demonstrated better agreement with Goldmann applanation tonometry compared to the Icare Pro.
  • All tested tonometers' measurements were influenced by central corneal thickness.
  • These findings suggest CST may offer a more comparable alternative to GAT, with CCT being an important consideration for all methods.