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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
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Related Experiment Video

Updated: Nov 1, 2025

Magnetic Adjustment of Afterload in Engineered Heart Tissues
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Afterload-related reference values for myocardial work indices.

Qiancheng Li1, Hui Wang2, Haiyan Feng2

  • 1Department of CT, Jilin Province FAW General Hospital, Changchun, China.

Cardiovascular Ultrasound
|June 25, 2021
PubMed
Summary
This summary is machine-generated.

Myocardial work (MW) increases with systolic blood pressure (SBP) but work efficiency remains stable. Afterload-related reference values for MW parameters are needed for accurate clinical assessment.

Keywords:
AfterloadMyocardial workReference values

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Last Updated: Nov 1, 2025

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Area of Science:

  • Cardiology
  • Physiology
  • Biomedical Engineering

Background:

  • The pressure-strain loop (PSL) is a novel, noninvasive tool for assessing myocardial work (MW).
  • Systolic blood pressure (SBP) is the sole independent determinant of MW indices.
  • Previously, afterload-related reference values for MW parameters were unreported.

Purpose of the Study:

  • To establish reference values for myocardial work parameters across a wide range of SBP.
  • To investigate the relationship between SBP (afterload) and MW indices in healthy individuals and those with elevated SBP.

Main Methods:

  • Prospective selection of healthy individuals and subjects with SBP ≥ 140 mmHg.
  • Exclusion of individuals with myocardial remodeling.
  • Collection of MW parameters and grouping by 10-mmHg SBP increments.

Main Results:

  • Significant differences in global work index (GWI) and global constructive work (GCW) were observed across SBP groups.
  • GWI and GCW demonstrated a linear increase with rising SBP (afterload) from 90 to 189 mmHg.
  • Global wasted work (GWW) showed an increasing trend with SBP, though not all differences were significant.
  • Global work efficiency (GWE) remained stable, with a slight decrease noted above 160 mmHg SBP.

Conclusions:

  • The magnitude of myocardial work, unlike work efficiency, significantly varies with afterload.
  • These findings underscore the necessity of afterload-related reference values for precise clinical evaluation of myocardial function.
  • Clinical research and diagnosis require consideration of SBP-adjusted MW parameters for accurate interpretation.