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Related Concept Videos

Development of the Heart01:27

Development of the Heart

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The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
As the embryo undergoes lateral folding, these paired tubes approach each other, merging into a single primitive heart...
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Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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Imaging Studies for Cardiovascular System III: X-Ray01:20

Imaging Studies for Cardiovascular System III: X-Ray

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The most common cardiovascular diagnostic test is an X-ray. It produces images of the heart, blood vessels, and adjacent structures.
Definition and Purpose
An X-ray, or radiograph, is a non-invasive method that uses ionizing radiation to take images of internal structures. It is mainly used in cardiac imaging to examine the heart, lungs, and major blood vessels, aiming to identify abnormalities in the heart's size, shape, and position, such as heart failure, congenital defects, and vascular...
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Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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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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Author Spotlight: Effect of Left Atrial Ligation on Avian Embryonic Hearts and HLHS Implications
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Cardiac Development and Related Clinical Considerations.

Namrita J Odackal1,2, Mary Crume2, Tanvi Naik3

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Area of Science:

  • Neonatal cardiology
  • Fetal physiology
  • Cardiovascular development

Background:

  • Premature infant hearts exhibit diverse anatomy and physiology across gestational ages.
  • Immature cardiac tissue is susceptible to ex utero stressors.
  • Hemodynamics in preterm neonates are influenced by intracardiac shunts and the fetal-to-neonatal transition.

Purpose of the Study:

  • To review the anatomy, hemodynamics, and electrophysiology of the preterm heart.
  • To highlight clinical considerations for managing premature neonates.
  • To synthesize current literature on preterm cardiac function.

Main Methods:

  • Literature review of studies on preterm infant cardiac anatomy, physiology, and hemodynamics.
  • Analysis of factors affecting cardiac function in premature neonates.
  • Synthesis of clinical implications for neonatal intensive care.

Main Results:

  • Preterm heart development is heterogeneous, impacting clinical management.
  • Understanding cardiac hemodynamics and shunts is crucial for transition.
  • Interventions significantly affect preterm cardiac function.

Conclusions:

  • Clinical management of preterm neonates requires tailored approaches based on cardiac development.
  • Further research is needed to fully understand the preterm heart.
  • Integrating knowledge of anatomy, hemodynamics, and electrophysiology improves care.