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Chambers of the Heart01:16

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The human heart is a complex organ made up of four chambers: the right and left atria and the right and left ventricles. These internal chambers are separated by partitions known as the interatrial and interventricular septa. The exterior of the heart features a groove known as the coronary sulcus that demarcates the atria from the ventricles, while the anterior and posterior interventricular sulci distinguish between the two ventricles.
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IntroductionAortic regurgitation is characterized by the backward flow of blood from the aorta into the left ventricle during diastole and arises from the improper closure of the aortic valve. This condition results in left ventricular volume overload and can stem from both acute and chronic etiologies, each contributing uniquely to the disease's progression and symptomatology.Acute and Chronic CausesAcute aortic regurgitation often results from events that suddenly impair the integrity of the...
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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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Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
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Right Heart Catheterization: An OverviewRight heart catheterization is an invasive diagnostic procedure that measures right-sided cardiac and pulmonary artery pressures, calculates cardiac output, and identifies intracardiac shunts. It provides detailed hemodynamic data essential for diagnosing and managing various cardiovascular conditions, such as pulmonary hypertension.Access SitesCommon access sites for right heart catheterization include the internal jugular vein in the neck region, the...
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Double-outlet right ventricle revisited.

Ameneh Ebadi1, Diane E Spicer1, Carl L Backer2

  • 1University of Florida Health Congenital Heart Center, Gainesville, Fla.

The Journal of Thoracic and Cardiovascular Surgery
|May 23, 2017
PubMed
Summary

Double-outlet right ventricle (DORV) definition is clarified: bilateral infundibula are not essential, and DORV can occur with an intact ventricular septum. This study re-evaluates key anatomical features of DORV.

Keywords:
double-outlet right ventricleinterventricular communicationmalpositionventricular septal defect

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Area of Science:

  • Pediatric Cardiology
  • Congenital Heart Disease
  • Cardiac Anatomy

Background:

  • Double-outlet right ventricle (DORV) is a complex congenital heart defect.
  • Existing definitions, particularly regarding bilateral infundibula and ventricular septal defects, remain debated.
  • Accurate anatomical characterization is crucial for diagnosis and surgical planning.

Purpose of the Study:

  • To examine the anatomic controversies surrounding double-outlet right ventricle.
  • To clarify the defining features of DORV based on morphological assessment.
  • To investigate the presence of atrioventricular-to-arterial valvular continuity in DORV.

Main Methods:

  • Morphological analysis of 100 hearts with DORV, defined as >75% support of both arterial roots by the right ventricle.
  • Assessment of arterial-atrioventricular valvular continuity, subarterial infundibular musculature, and ventricular septal status.
  • Utilized specimens from multiple major children's hospitals.

Main Results:

  • Fibrous continuity between an arterial valve and an atrioventricular valve was observed in most hearts.
  • Bilateral infundibula were present in only 23% of the specimens.
  • An intact ventricular septum was found in 5% of the examined hearts.

Conclusions:

  • Bilateral infundibula are not a defining characteristic of double-outlet right ventricle.
  • The interventricular communication in DORV exhibits variable morphology, including perimembranous extension.
  • Double-outlet right ventricle can occur even with an intact ventricular septum, challenging traditional diagnostic criteria.