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Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
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Mitral Stenosis I: Introduction01:22

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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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Aortic regurgitation (AR) is when the aortic valve does not close or seal properly, leading to backward blood circulation from the aorta into the left ventricle during diastole. Common causes of AR include rheumatic heart disease, congenital valve defects, and aortic root dilation. Managing AR requires a multifaceted approach to alleviate symptoms, preserve left ventricular function, and address the underlying cause of the regurgitation. Patients with symptomatic AR or significant left...
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Mitral Stenosis IV: Nursing Management01:27

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A comprehensive nursing assessment is essential for patients with valvular heart disease, which involves any dysfunction of the heart valves that could impact blood flow and overall heart function.Subjective Data Collection:Chief Complaint and Present Illness: Start with the patient's primary concerns, focusing on the onset, duration, and progression of cardiac symptoms such as dyspnea, fatigue, chest pain, and palpitations.Past Medical History: Collect detailed information on any previous...
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Mitral Stenosis II: Clinical features and Diagnostic Tests01:23

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Mitral stenosis is a heart condition in which the mitral valve, which allows blood to flow from the left atrium to the left ventricle, becomes narrowed or stenotic. This narrowing hinders blood flow and leads to clinical symptoms requiring specific medical evaluations and management strategies. The following overview outlines the clinical symptoms, assessments, diagnostic findings, prevention methods, and treatments for mitral stenosis.Clinical ManifestationsDyspnea (shortness of breath): This...
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Exercise and Cardiovascular Response01:20

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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
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Lumped-Parameter and Finite Element Modeling of Heart Failure with Preserved Ejection Fraction
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Invasive Hemodynamic Exercise Response in Hemodynamically Significant Aortic Stenosis With Preserved Left Ventricular

Mulham Ali1,2,3, Peter Hartmund Frederiksen1,2, Jacob Eifer Møller1,2,4

  • 1Department of Cardiology, Odense University Hospital, Denmark (M.A., P.H.F., J.E.M., N.S.B.M., A.C., A.H., M.K.P., K.A.Ø., J.S.D.).

Circulation. Heart Failure
|February 23, 2026
PubMed
Summary

This study shows that discordant low-gradient aortic stenosis (AS) exhibits similar exercise hemodynamic responses to high-gradient severe AS, suggesting it is a severe form of AS. It also indicates heart failure with preserved ejection fraction physiology in this patient group.

Keywords:
aortic valveheart failurephenotypesstroke volumeventricular function

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Area of Science:

  • Cardiology
  • Hemodynamics
  • Aortic Stenosis

Background:

  • Guidelines suggest discordant low-gradient (LG) aortic stenosis (AS) can be severe, but assessment is challenging.
  • Right heart catheterization during exercise is the gold standard for evaluating ventricular hemodynamics.
  • No prior invasive studies compared exercise hemodynamic responses in discordant LG AS versus severe AS.

Purpose of the Study:

  • To describe exercise hemodynamics in patients with asymptomatic discordant AS and preserved left ventricular ejection fraction (≥50%).

Main Methods:

  • 86 patients with aortic valve area ≤1.5 cm² underwent right heart catheterization at rest and during maximal exercise.
  • Key measurements included pulmonary capillary wedge pressure (PCWP) and cardiac output (CO), calculating the PCWP/CO-slope.
  • Patients were stratified into discordant LG AS, moderate AS, and high-gradient (HG) severe AS groups.

Main Results:

  • The PCWP/CO-slope was significantly steeper in discordant LG AS (3.3) and HG severe AS (2.7) compared to moderate AS (1.9).
  • Systemic arterial compliance and AS severity were associated with the PCWP/CO-slope in a regression model.
  • Discordant LG AS patients showed a leftward-upward shift in the PCWP/CO-curve.

Conclusions:

  • Discordant LG AS and HG severe AS demonstrate similar exercise hemodynamic responses, indicating discordant LG AS is a severe form of AS.
  • The observed leftward-upward shift in the PCWP/CO-curve for discordant LG AS suggests co-existing heart failure with preserved ejection fraction physiology.