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Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

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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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Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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Cardiomyopathy IV: Restrictive Cardiomyopathy01:29

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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
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Cardiomyopathy I: Introduction and Classification01:25

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Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...
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Coronary Artery Disease II: Pathophysiology01:26

Coronary Artery Disease II: Pathophysiology

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Coronary Artery Disease (CAD) originates from a series of events that impair the function of coronary arteries, the blood vessels responsible for delivering oxygen-rich blood to the heart muscle. The pathophysiology of CAD is closely linked to atherosclerosis, a chronic inflammatory and lipid-driven condition affecting the vascular endothelium.1. Endothelial DamageThe process begins with damage to the vascular endothelium, which serves as a protective barrier between the blood and the vessel...
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Updated: Sep 26, 2025

Evaluation of Left Ventricular Structure and Function using 3D Echocardiography
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Glycemic status, non-traditional risk and left ventricular structure and function in the Jackson Heart Study.

Chizobam Ani1,2,3, David Shavlik4, Synnove Knutsen4

  • 1Loma Linda University (LLU), Loma Linda, USA. cani@llu.edu.

BMC Cardiovascular Disorders
|April 22, 2022
PubMed
Summary

Diabetes and prediabetes are linked to early left ventricular changes in African Americans, even without traditional heart disease risk factors. These findings highlight the importance of glycemic control for cardiovascular health.

Keywords:
African AmericanDiabetesDiabetic cardiomyopathyLeft ventricular structure

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Area of Science:

  • Cardiology
  • Endocrinology
  • Public Health

Background:

  • Left ventricular abnormalities may precede cardiomyopathy in African Americans with diabetes (DM).
  • This study investigates the link between prediabetes (PDM), DM, and HbA1c with cardiac structure and function in the Jackson Heart Study (JHS) cohort.
  • Participants were free of coronary artery disease (CAD), arrhythmia, valvular heart disease, and end-stage renal disease (ESRD).

Purpose of the Study:

  • To examine the association of PDM, DM, and HbA1c levels with left ventricular structure and function.
  • To identify early cardiac changes related to glycemic status in a high-risk population.
  • To understand the impact of diabetes on cardiac parameters independent of traditional risk factors.

Main Methods:

  • Retrospective cross-sectional analysis of 2234 JHS participants.
  • Evaluated associations between PDM, DM, HbA1c, and various left ventricular parameters (e.g., ejection fraction, mass index, wall thickness).
  • Statistical analyses included linear regression, with sensitivity analyses for hypertension.

Main Results:

  • DM was associated with altered stroke volume index, diastolic volume index, myocardial contraction fraction, cardiac index, relative wall thickness, and left ventricular mass index.
  • Prediabetes showed associations with lower stroke volume index, diastolic volume index, and systolic volume index.
  • Higher HbA1c levels correlated with reduced stroke volume index, diastolic volume index, myocardial contraction fraction, and increased cardiac index and relative wall thickness.

Conclusions:

  • Glycemic status significantly impacts left ventricular structure and function in African Americans without traditional cardiovascular disease risk factors.
  • These findings suggest that diabetes and prediabetes are associated with early cardiac remodeling.
  • Further longitudinal studies are recommended to confirm these associations and explore underlying mechanisms.