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Heart Failure Drugs: β-Blockers01:22

Heart Failure Drugs: β-Blockers

β-adrenergic antagonists, commonly known as β-blockers, block the effects of sympathetic neurotransmitters such as noradrenaline (NA) and adrenaline (ADR). They have several beneficial effects in heart failure treatment. They reduce heart rate, the force of contraction, and cardiac muscle relaxation. They also slow the atrial-ventricular conduction rate and raise the threshold for arrhythmias. The concentration of β-blockers determines their effects on bronchodilation, vasodilation, and...
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Heart failure (HF) manifests primarily as dyspnea, fatigue, and fluid retention, resulting in peripheral and pulmonary edema. Symptoms may vary depending on which ventricle is more affected, left or right.Left-Sided Heart FailureAlso known as left ventricular failure, this condition results from the left ventricle's inability to fill or eject sufficient blood into the systemic circulation. It leads to pulmonary congestion, which occurs when the left ventricle fails to eject blood effectively...
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Heart Failure II: Pathophysiology01:29

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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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Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
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Published on: March 21, 2013

Vasovagal syncope in patients with reduced left ventricular function.

Christopher M Stanton1, Phillip A Low, David O Hodge

  • 1Division of Cardiovascular Diseases, Mayo Clinic, Rochester, MN 55905, USA.

Clinical Autonomic Research : Official Journal of the Clinical Autonomic Research Society
|January 11, 2007
PubMed
Summary

Vasovagal syncope (VVS) can occur in patients with left ventricular dysfunction. This study found VVS predominantly presents as a vasodepressor response, not a cardioinhibitory one, in this population.

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Area of Science:

  • Cardiology
  • Neuroscience

Background:

  • Vasovagal syncope (VVS) is typically mediated by arterial mechanoreceptors.
  • The Bezold-Jarisch reflex is a key mechanism, though triggers can vary.
  • VVS is considered uncommon in individuals with left ventricular dysfunction.

Purpose of the Study:

  • To investigate the occurrence and characteristics of VVS in patients with left ventricular dysfunction.
  • To examine patient demographics and hemodynamic responses during tilt table testing in this specific subset.

Main Methods:

  • 128 consecutive patients with ejection fraction <40% underwent 70-degree, 45-minute tilt table testing.
  • Patient characteristics and hemodynamic data were reviewed for those with a positive neurocardiogenic response.
  • Hemodynamic responses were analyzed, categorizing them as cardioinhibitory, mixed, or vasodepressor.

Main Results:

  • 15 patients (11.7%) experienced a positive neurocardiogenic response indicative of VVS.
  • The mean age of affected patients was 70.1 years, with a mean ejection fraction of 27.7%.
  • The majority of vasovagal responses (9/14) were vasodepressor type, with only 5 being mixed type; no cardioinhibitory responses were observed.

Conclusions:

  • Vasovagal syncope can occur in patients with significant left ventricular dysfunction.
  • The findings suggest a predominantly vasodepressor mechanism in this population, differing from typical VVS presentations.
  • Further research is warranted to elucidate the specific mechanisms of VVS in patients with left ventricular dysfunction.