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Related Concept Videos

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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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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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Related Experiment Video

Updated: Mar 9, 2026

Morphological and Functional Assessment of the Right Ventricle Using 3D Echocardiography
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Left ventricular outflow tract obstruction-be prepared!

J S Evans1, S J Huang2, A S McLean3

  • 1Senior Lecturer, James Cook University, Townsville, Senior Staff Specialist, Intensive Care Unit, Townsville Hospital, Queensland.

Anaesthesia and Intensive Care
|January 11, 2017
PubMed
Summary
This summary is machine-generated.

In critically ill patients, increased inotropic support and reduced fluids may cause left ventricular outflow tract obstruction (LVOTO). Early echocardiography diagnosis is crucial for managing this potentially life-threatening condition.

Keywords:
left ventricular outflow tract obstruction, echocardiography, critical care

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Area of Science:

  • Critical Care Medicine
  • Cardiology
  • Intensive Care

Background:

  • Current hypotension treatment trends emphasize inotropic support over fluid resuscitation to prevent fluid overload.
  • This approach can precipitate left ventricular outflow tract obstruction (LVOTO) in susceptible individuals.
  • LVOTO, classically linked to hypertrophic cardiomyopathy, also occurs in septic shock, myocardial infarction, and post-surgery.

Purpose of the Study:

  • To highlight the risk of dynamic LVOTO in critically ill hypotensive patients.
  • To emphasize the importance of considering LVOTO in patients receiving inotropic support.
  • To underscore the utility of echocardiography in diagnosing LVOTO.

Main Methods:

  • Review of clinical trends in hypotension management.
  • Analysis of predisposing factors and conditions associated with LVOTO.
  • Discussion of echocardiographic techniques for LVOTO detection.

Main Results:

  • LVOTO can be triggered by the combination of inotropic support and reduced fluid resuscitation.
  • Predisposing factors include age, sex, hypertension, diabetes, and specific anatomical conditions.
  • The onset of LVOTO is unpredictable, influenced by preload, afterload, heart rhythm, and rate.

Conclusions:

  • Dynamic LVOTO is a critical, treatable cause of hypotension in intensive care units.
  • Echocardiography is the preferred diagnostic tool for assessing LVOTO and its pathophysiology.
  • Prompt recognition and diagnosis of LVOTO are essential to prevent refractory hypotension.