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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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Blood pressure measurement is a fundamental clinical procedure, providing crucial data for assessing cardiovascular health. Among the various sites for this measurement, the brachial and popliteal arteries are predominantly utilized due to their accessibility and the reliability of their readings. This lesson delves into the anatomical significance, methodology, and considerations of measuring blood pressure at these locations.
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Related Experiment Video

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Measuring Stress on a Third-Generation Balloon-Expandable Aortic Valve During Expansion.

Francesco Nappi1, Thibaut Schoell2, Sanjeet Singh Avtaar Singh3

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Summary

This study analyzed mechanical stresses on the Edwards SAPIEN 3 transcatheter aortic valve during crimping and expansion, especially with aortic calcification. Peak stresses occurred at leaflet attachment points, indicating risks for thrombosis and degeneration.

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Materials Science

Background:

  • Transcatheter aortic valve replacement (TAVR) is a key treatment for aortic stenosis.
  • Third-generation balloon-expandable valves like the Edwards SAPIEN 3 (S3-TAV) are widely used.
  • Aortic calcification poses challenges to TAVR device performance and longevity.

Purpose of the Study:

  • To determine mechanical stresses on the S3-TAV during crimping and expansion in the presence of aortic calcification.
  • To identify critical regions of stress concentration within the valve.
  • To correlate simulated stress patterns with potential clinical complications like thrombosis and degeneration.

Main Methods:

  • Reconstruction of a 3D computer-aided design (CAD) model of the S3-TAV.
  • Finite element analysis (FEA) simulations of valve crimping, reopening, and systemic pressure loading.
  • Utilized high-resolution micro-computed tomography scans for accurate geometric meshing.
  • Material properties derived from surgical bioprostheses and cobalt-chromium alloys.

Main Results:

  • Peak stresses during crimping were concentrated at the commissural tips, the leaflet attachment sites.
  • These stress hotspots are identified as potential sites for thrombosis and valve degeneration.
  • Persistent bulky calcifications post-expansion can lead to paravalvular leakages (PVLs), precursors to thrombosis and degeneration.

Conclusions:

  • The crimping process induces significant stress at the commissural tips of the S3-TAV.
  • Aortic calcification is a critical factor influencing valve stress distribution and potential failure modes.
  • Understanding these mechanical stresses is crucial for improving TAVR device design and patient outcomes.