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Related Concept Videos

Aortic Regurgitation I: Introduction01:15

Aortic Regurgitation I: Introduction

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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...
14
Aortic Regurgitation III: Medical Management01:25

Aortic Regurgitation III: Medical Management

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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 I: Introduction01:22

Mitral Stenosis I: Introduction

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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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Mitral Stenosis III: Medical Management01:26

Mitral Stenosis III: Medical Management

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Mitral stenosis, a condition marked by the narrowing of the mitral valve, necessitates an integrated approach for effective management. This approach includes preventative measures, medical therapy, and surgical interventions to reduce symptoms and prevent complications.PreventionPrevention of mitral stenosis primarily focuses on reducing the incidence of bacterial infections, particularly streptococcal infections, which can lead to rheumatic fever and subsequent valvular damage. Timely...
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Mitral Stenosis IV: Nursing Management01:27

Mitral Stenosis IV: Nursing Management

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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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Aortic Regurgitation IV: Nursing Management01:17

Aortic Regurgitation IV: Nursing Management

31
A nurse managing a patient with aortic regurgitation begins with a comprehensive assessment, including a review of the patient's medical history, family history, and lifestyle factors. During the cardiac examination, the nurse listens for heart sounds and checks for signs of valve abnormalities. The nurse also observes for symptoms such as dyspnea, orthopnea, and paroxysmal nocturnal dyspnea and assesses the patient's endurance and daily activity tolerance.Based on the findings, the nurse...
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Related Experiment Video

Updated: Jul 22, 2025

Full-root Aortic Valve Replacement by Stentless Aortic Xenografts in Patients with Small Aortic Roots
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Neurovascular coupling in severe aortic valve stenosis.

Ana Ovsenik1,2, Matej Podbregar3,4, Nikola Lakič5

  • 1Faculty of Medicine, Department of Biomedicine, University of Ljubljana, Ljubljana, Slovenia.

Brain and Behavior
|July 21, 2023
PubMed
Summary

Patients with severe aortic stenosis (AS) show impaired neurovascular coupling, indicated by higher visually evoked cerebral blood flow velocity responses (VEFR). This dysregulation may contribute to cognitive decline in AS patients.

Keywords:
aortic stenosiscerebral blood flowneurovascular couplingtranscranial Doppler

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Area of Science:

  • Cardiovascular Medicine
  • Neurology
  • Medical Imaging

Background:

  • Aortic stenosis (AS) obstructs left ventricular outflow, potentially impairing brain perfusion.
  • Hemodynamic alterations in AS may disrupt cerebral blood flow regulation.
  • Understanding neurovascular coupling in AS is crucial for assessing cognitive function.

Purpose of the Study:

  • To evaluate neurovascular coupling in patients with severe aortic stenosis.
  • To investigate cerebral blood flow regulatory mechanisms in AS using Transcranial Doppler ultrasonography.

Main Methods:

  • Assessed visually evoked cerebral blood flow velocity responses (VEFR) in the posterior cerebral artery.
  • Analyzed peak systolic, mean, and end-diastolic VEFR in 54 severe AS patients and 43 controls.
  • Utilized 10 cycles of visual stimulation and repeated-measures ANOVA for data comparison.

Main Results:

  • Severe AS patients exhibited significantly higher peak systolic VEFR (12.9% ± 5.6%) compared to controls (10.5% ± 4.5%; p = .009).
  • Mean VEFR was also significantly elevated in AS patients (14.4% ± 5.8%) versus controls (12.2% ± 4.9%; p = .021).
  • A trend towards higher end-diastolic VEFR was observed in AS patients (p = .061).

Conclusions:

  • This study demonstrates, for the first time, dysregulated neurovascular coupling in severe AS patients, evidenced by elevated VEFR.
  • Impaired neurovascular coupling may be a contributing factor to cognitive decline in individuals with aortic stenosis.
  • Transcranial Doppler ultrasonography is a valuable tool for assessing cerebral hemodynamics in AS.