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Related Concept Videos

Regulation of Heart Rates01:31

Regulation of Heart Rates

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The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
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Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

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Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
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The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
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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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Dysrhythmias VI: Management of Dysrhythmias01:25

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Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
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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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Optimal Heart Rate Modulation Using Ivabradine.

Teruhiko Imamura1, Koichiro Kinugawa1

  • 1The Second Department of Internal Medicine, University of Toyama.

International Heart Journal
|July 19, 2021
PubMed
Summary

Ivabradine heart rate modulation therapy benefits patients with systolic dysfunction. An echocardiography-guided approach, targeting diastolic filling waves, may optimize cardiac output and outcomes, requiring further study.

Keywords:
Deceleration timeEchocardiographyHeart failureHemodynamics

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Area of Science:

  • Cardiology
  • Pharmacology
  • Medical Imaging

Background:

  • Heart rate modulation therapy with ivabradine is established for improving mortality and morbidity in patients with systolic dysfunction.
  • Current therapeutic strategies lack a definitive target heart rate for ivabradine, creating clinical uncertainty.

Purpose of the Study:

  • To introduce and explore the concept of echocardiography-guided ivabradine therapy.
  • To propose a novel therapeutic strategy aiming to maximize cardiac output and facilitate reverse remodeling by targeting diastolic filling waves.

Main Methods:

  • The proposed method involves using echocardiography to guide ivabradine therapy.
  • The specific echocardiographic target is to achieve zero overlap between two diastolic filling inflow waves during diastole.
  • This approach replaces traditional absolute target heart rate values.

Main Results:

  • The echocardiography-guided strategy aims to maximize cardiac output.
  • This approach is hypothesized to facilitate reverse cardiac remodeling.
  • The ultimate goal is to further reduce mortality and morbidity in patients with systolic dysfunction.

Conclusions:

  • Echocardiography-guided ivabradine therapy presents a novel strategy for heart rate modulation.
  • Further prospective studies are essential to validate the clinical implications of this approach.
  • The concept warrants expansion to other clinical scenarios beyond systolic dysfunction.