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Related Concept Videos

Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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 blood...
Disorders of Erythrocytes01:27

Disorders of Erythrocytes

Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...
Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

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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Factors Affecting Erythropoiesis01:24

Factors Affecting Erythropoiesis

The cardiovascular system regulates the number of erythrocytes in the bloodstream to ensure optimal oxygen transport. It also prevents over-proliferation of these cells, which helps to maintain blood viscosity and flow rate.
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Pathophysiology of Cardiac Performance

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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Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry
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Published on: November 5, 2019

Cardiovascular function and dysfunction in sickle cell anemia.

L Julian Haywood1

  • 1Department of Medicine (Cardiology), Los Angeles County+University of Southern California Medical Center, CA 90033, USA. jhaywood@hsc.usc.edu

Journal of the National Medical Association
|February 28, 2009
PubMed
Summary
This summary is machine-generated.

Sickle cell anemia (SCA) impacts the heart, causing enlarged heart and myocardial ischemia due to anemia and blood viscosity. Key mortality risks include hypertension and pulmonary hypertension.

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Area of Science:

  • Hematology
  • Cardiology
  • Pathophysiology

Background:

  • Sickle cell anemia (SCA) was identified in 1910 and remains a significant clinical entity.
  • SCA presents complex pathophysiologic mechanisms, particularly concerning cardiopulmonary and circulatory systems.
  • Understanding SCA's cardiovascular impact is crucial for patient outcomes.

Purpose of the Study:

  • To review the pathophysiologic mechanisms of cardiopulmonary and circulatory disorders in sickle cell anemia.
  • To highlight the relationship between SCA and cardiac complications such as cardiomegaly and myocardial ischemia.
  • To identify mortality risk factors associated with sickle cell anemia.

Main Methods:

  • Review of existing data and literature on sickle cell anemia and its cardiovascular manifestations.
  • Analysis of pathophysiologic pathways linking anemia, blood viscosity, and cardiac dysfunction.
  • Identification of clinical factors contributing to mortality in SCA patients.

Main Results:

  • Cardiomegaly in SCA is linked to increased cardiac workload from anemia.
  • Myocardial ischemia results from severe anemia, microthrombi, and increased blood viscosity.
  • Sudden death can occur due to myocardial infarction or rhythm disturbances; hypertension and pulmonary hypertension are key mortality risks.

Conclusions:

  • Sickle cell anemia significantly affects cardiovascular health, leading to conditions like cardiomegaly and myocardial ischemia.
  • Early identification and management of risk factors such as hypertension are vital for improving survival in SCA patients.
  • Continued research into SCA's complex mechanisms is essential for developing effective therapeutic strategies.