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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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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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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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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
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Intraventricular vortex properties in nonischemic dilated cardiomyopathy.

Javier Bermejo1, Yolanda Benito, Marta Alhama

  • 1Department of Cardiology, Hospital General Universitario Gregorio Marañón, Facultad de Medicina, Universidad Complutense de Madrid, and Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain;

American Journal of Physiology. Heart and Circulatory Physiology
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PubMed
Summary

Vortices in the left ventricle (LV) are larger and stronger in patients with nonischemic dilated cardiomyopathy (NIDCM). These enlarged vortices help improve blood flow and transport within the remodeled heart chambers.

Keywords:
diastolic functiondoppler echocardiographyfluid dynamics

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Area of Science:

  • Cardiovascular Physiology
  • Medical Imaging
  • Hemodynamics

Background:

  • Left ventricular (LV) vortices play a role in mechanical efficiency and blood mixing.
  • Understanding vortex dynamics is crucial for assessing cardiac function, particularly in conditions like nonischemic dilated cardiomyopathy (NIDCM).

Purpose of the Study:

  • To characterize the size, position, circulation, and kinetic energy (KE) of LV main vortex cores in NIDCM patients.
  • To analyze the physiological correlates of these vortex features.
  • To compare vortex characteristics between NIDCM patients and healthy controls.

Main Methods:

  • Digital processing of color-Doppler images to analyze flow evolution.
  • Study included 61 patients with NIDCM and 61 age-matched controls.
  • Vortex features were analyzed over the cardiac cycle, with particular attention to diastolic filling phases.

Main Results:

  • LV vortex features exhibited a biphasic temporal course during diastole, with peak KE occurring at the A wave, storing significant inflow energy.
  • Patients with NIDCM demonstrated larger and stronger vortices (increased circulation and KE) compared to controls, even after LV size correction.
  • Vortex KE correlated with inflow KE and LV short-axis diameter; Doppler measurements showed strong correlation with phase-contrast MRI.

Conclusions:

  • The biphasic nature of diastolic filling dictates normal LV vortex physiology.
  • Vortex formation is exaggerated in NIDCM due to cardiac remodeling, with enlarged vortices aiding in reducing pressure losses and facilitating blood transport.
  • Ultrasound-based methods can accurately assess these vortex dynamics.