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Related Concept Videos

Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

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Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
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Heart Failure I: Introduction01:27

Heart Failure I: Introduction

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Heart failure refers to a clinical syndrome caused by structural or functional cardiac disorders that prevent the heart from pumping an adequate amount of blood to meet the body's metabolic needs. This condition often arises from myocardial infarction or ischemia, leading to decreased cardiac output, reduced tissue perfusion, impaired gas exchange, fluid volume imbalance, and decreased functional ability.Heart failure can result from disruptions in the mechanisms that regulate cardiac output...
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Heart Failure VI: Adjunct Therapies01:22

Heart Failure VI: Adjunct Therapies

340
Additional therapies for treating patients with heart failure (HF) may include procedural interventions, supplemental oxygen, the management of sleep disorders, and nutritional therapy.Procedural InterventionsImplantable Cardioverter-Defibrillator: For patients at risk of life-threatening arrhythmias due to severe left ventricular dysfunction, an Implantable Cardioverter-Defibrillator (ICD) can detect and terminate these arrhythmias, preventing sudden cardiac death and improving survival rates.
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Heart Failure Drugs: Diuretics01:22

Heart Failure Drugs: Diuretics

971
Heart failure and kidney perfusion are interconnected in a complex way. Reduced renal perfusion and venous congestion are two significant factors that contribute to renal dysfunction in heart failure. The kidneys, primarily responsible for fluid balance in the body, are adversely affected due to compromised cardiac output and increased venous pressure. In response to reduced renal perfusion, the kidneys activate neurohumoral mechanisms to restore balance. However, these mechanisms can be...
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Heart Failure V: Medical Management01:30

Heart Failure V: Medical Management

319
Medical Management of Acute Decompensated Heart Failure (ADHF)The primary goals of therapy for patients hospitalized with acute decompensated heart failure (ADHF) include:Relieving symptomsOptimizing volume statusSupporting oxygenation and ventilationMaintaining cardiac output (CO) and end-organ perfusionIdentifying and addressing the cause of ADHFPreventing complicationsProviding patient education on factors precipitating HF exacerbationPlanning for dischargeOngoing monitoring and assessment...
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Related Experiment Video

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Author Spotlight: Investigating HR-Dependent Cardiac Function in Mouse Models Through a Novel Atrial-Pacing Approach
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Ventilatory constraints influence physiological dead space in heart failure.

Joshua R Smith1, Thomas P Olson1

  • 1Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA.

Experimental Physiology
|October 10, 2018
PubMed
Summary

In heart failure with reduced ejection fraction (HFrEF), reduced tidal and alveolar volumes increase physiological dead space during exercise. Greater ventilatory constraints worsen this effect, impacting breathing efficiency.

Keywords:
Hyperinflationoperating lung volumessystolic heart failuretachypnoea

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Area of Science:

  • Cardiopulmonary physiology
  • Exercise science
  • Heart failure research

Background:

  • Patients with heart failure with reduced ejection fraction (HFrEF) have impaired ventilatory efficiency and elevated physiological dead space.
  • The specific impact of breathing strategies on physiological dead space in HFrEF during exercise remains unclear.

Purpose of the Study:

  • To investigate how changes in tidal volume and alveolar volume affect physiological dead space in HFrEF patients during submaximal exercise.
  • To determine the contribution of ventilatory constraints to elevated physiological dead space in this population.

Main Methods:

  • Compared HFrEF patients (n=9) with healthy controls (CTL, n=9) during constant-load cycling exercise at matched ventilation.
  • Measured inspiratory capacity, lung volumes, and arterial blood gases to calculate physiological dead space (VD/VT), alveolar volume, and dead space ventilation.

Main Results:

  • HFrEF patients exhibited higher VD/VT and ventilatory equivalent for carbon dioxide slope than CTL subjects.
  • At similar ventilation, HFrEF patients had smaller tidal volumes and alveolar volumes.
  • Increased breathing frequency in HFrEF led to greater dead space ventilation.
  • Reduced inspiratory capacity and increased expiratory reserve volume in HFrEF were linked to VD/VT and alveolar volume.

Conclusions:

  • Reduced tidal and alveolar volumes contribute to elevated physiological dead space in HFrEF during submaximal exercise.
  • The severity of ventilatory constraints exacerbates physiological dead space in HFrEF.
  • These findings underscore the detrimental effects of ventilatory limitations on gas exchange during exercise in HFrEF.