Related Experiment Video
Updated: May 11, 2026
05:14
Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
Published on: September 16, 2025
[Pressure wave shape comparison between two non-invasive tonometric devices].
D Agnoletti1, S Millasseau, J Topouchian
1Centre de diagnostic et de thérapeutique, Paris Descartes University, Hôtel-Dieu, AP-HP, 1, place du Parvis-Notre-Dame, 75181 Paris cedex 04, France.
Annales De Cardiologie Et D'Angeiologie
|June 1, 2013
Summary
The SphygmoCor and PulsePen devices show different radial and carotid pressure waveforms. These differences impact hemodynamic parameter calculations, particularly for radial-derived metrics.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
- Medical Device Technology
Background:
- Pulse wave analysis (PWA) is crucial for estimating central hemodynamic parameters using applanation tonometry.
- Previous work indicated discrepancies in radial second systolic peak (rSPB2) between SphygmoCor and PulsePen devices.
- Validation of PWA devices against invasive catheterism shows good agreement in harmonic patterns.
Purpose of the Study:
- To quantitatively assess and compare differences in radial and carotid pressure waveforms obtained from SphygmoCor and PulsePen devices.
- To evaluate the impact of device-specific waveform differences on calculated hemodynamic parameters.
Main Methods:
- Radial and carotid pressure waveforms were recorded from 38 patients under stable hemodynamic conditions.
- Measurements were performed using both SphygmoCor and PulsePen devices.
- Waveforms were digitally extracted for subsequent off-line analysis.
Main Results:
- SphygmoCor yielded lower values for radial rSBP2, mean arterial pressure, form factor, and augmentation index compared to PulsePen.
- Carotid augmentation index and form factor showed no significant difference between the two devices.
- Carotid systolic pressure (cSBP) was significantly higher when measured with PulsePen versus SphygmoCor (2.7 ± 4.4 mmHg, P<0.001).
Conclusions:
- The SphygmoCor and PulsePen sensors are not interchangeable, producing distinct pressure waveform shapes.
- These waveform discrepancies lead to significant differences in computed hemodynamic parameters, especially for radial-derived indices.
- Further research is needed to compare invasive pressure measurements with indices derived from these non-invasive devices.
Related Concept Videos
01:30Equipments Used To Measure Blood Pressure
Direct Method
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
01:23Assessment of blood pressure in brachial artery(two-step method)
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...
01:19Assessing Blood pressure using a doppler ultrasound
To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
01:28Special considerations while measuring blood pressure
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.
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
01:17Sound as Pressure Waves
Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
The pressure fluctuation depends on the difference in displacements between the successive points in the...
01:17Measurement of Blood Pressure
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 stethoscope.