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Overview of the Heart

Overview of the Heart

The heart, a muscular organ located in the chest, functions as the body's pump, circulating blood through the vascular system. It has four chambers: two atria on top and two ventricles below. The right atrium receives deoxygenated blood from the body and passes it to the right ventricle, which pumps it to the lungs for oxygenation. The left atrium receives oxygenated blood from the lungs and transfers it to the left ventricle, which pumps it to the rest of the body.
The heart's structure...

Conduction System of the Heart

Conduction System of the Heart

Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...

COPD: Pathogenesis and Clinical Features

COPD: Pathogenesis and Clinical Features

Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...

COPD: Management Using Bronchodilators and Corticosteroids

COPD: Management Using Bronchodilators and Corticosteroids

Chronic obstructive pulmonary isease (COPD) involves a group of progressive lung disorders characterized by persistent airflow limitation and chronic respiratory symptoms. Asthma-COPD Overlap Syndrome (ACOS), encompassing features of both asthma and Chronic obstructive pulmonary disease (COPD), is a group of progressive lung disorders that includes chronic bronchitis, emphysema, and refractory (non-reversible) asthma. ACOS leads to complex clinical presentations that combine the inflammatory...

Anatomy of the Heart

Anatomy of the Heart

The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.

Anatomy of the Heart

Anatomy of the Heart

The heart is a hollow, muscular organ approximately the size of a fist, consisting of four chambers. It is enclosed in the pericardium, a fibrous sac with two layers: the visceral and parietal pericardium, separated by a fluid-filled space containing serous fluid to reduce friction.
The heart has three layers: the innermost endocardium, the muscular myocardium, and the outer epicardium, all working together for optimal cardiac function.
Chambers of the Heart
The heart is made up of four...

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Related Experiment Video

Updated: Jan 28, 2026

Author Spotlight: Investigating HR-Dependent Cardiac Function in Mouse Models Through a Novel Atrial-Pacing Approach

Author Spotlight: Investigating HR-Dependent Cardiac Function in Mouse Models Through a Novel Atrial-Pacing Approach

Published on: July 21, 2023

Right heart function in COPD.

William Macnee¹

¹Department of Respiratory and Environmental Medicine, University of Edinburgh, ELEGI Colt Laboratories, MRC Centre for Inflammation Research, The Queen's Medical Research Institute, Edinburgh, Scotland, United Kingdom. w.macnee@ed.ac.uk

Seminars in Respiratory and Critical Care Medicine

|May 25, 2010

Summary

This summary is machine-generated.

Pulmonary hypertension in COPD patients, often mild, indicates a poor prognosis. Severe cases lead to right heart failure, and effective treatments beyond oxygen therapy remain debated.

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Area of Science:

Cardiology
Pulmonology
Respiratory Medicine

Background:

Pulmonary hypertension (PH) is a frequent complication in severe hypoxic chronic obstructive pulmonary disease (COPD).
While often mild, PH presence signifies a poor prognosis, with severe cases leading to right heart failure.
The pathophysiology is linked to hypoxic pulmonary vasoconstriction and arterial wall remodeling.

Purpose of the Study:

To review the current understanding of pulmonary hypertension in COPD.
To discuss the controversial hypotheses linking hypoxemia, PH, and adverse outcomes.
To evaluate the debated efficacy of interventions targeting pulmonary arterial pressure (PAP) or right ventricular function.

Main Methods:

Literature review and synthesis of existing research on PH in COPD.
Analysis of the proposed mechanisms including hypoxic pulmonary vasoconstriction and structural remodeling.
Discussion of current therapeutic strategies and areas requiring further investigation.

Main Results:

Hypoxemia in COPD commonly causes PH, impacting right ventricular function, exercise tolerance, and survival.
The direct impact of interventions on PAP or RV function on long-term survival is not definitively proven.
Long-term hypoxemia correction is the only therapy with proven survival benefits.

Conclusions:

Pulmonary hypertension in COPD is a significant prognostic factor, particularly severe forms.
Therapeutic interventions for PH in COPD require further research to establish efficacy and impact on survival and symptoms.
Focus remains on long-term hypoxemia management while exploring novel treatments for PH and right ventricular dysfunction.