Name: congestive heart failure causes and effects
Uploaded: 2025-05-15T09:19:11.000Z
Duration: 1 min 26 s
Channel: JoVE

K12 Standards

ohios-learning-standards-and-model-curriculum

Ohio’s Learning Standards and Model Curriculum

9-12

Human Anatomy and Physiology

Transport

Cardiovascular System

Imbalances in Cardiac Output

Congestive heart failure, or CHF, can reduce the heart's pumping efficiency.
In CHF, an increase in preload excessively stretches the myocardium, eventually leading to decreased pumping capacity.
It is commonly caused by coronary atherosclerosis, high blood pressure, myocardial infarctions, and dilated cardiomyopathy.
In coronary atherosclerosis, fatty deposits build up in the coronary arteries and impair blood flow to the myocardium.
Persistent high blood pressure forces the ventricles to work harder to overcome it, increasing myocardial strain.
A myocardial infarction causes the death of cardiac tissue, which gets replaced by noncontractile scar tissue, reducing pumping capacity.
Dilated cardiomyopathy may result from a number of causes, including drug toxicity or coronary artery disease, to name a few, weakening the myocardium.
Additionally, each side of the heart can fail independently, causing different symptoms.
If the left side fails, blood builds up in the lungs, causing pulmonary edema and potential suffocation.
If the right side fails, it leads to peripheral congestion, causing fluid buildup in tissues and edema in the extremities.

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&#8212;the right side continues to send blood to the lungs, but the left side fails to efficiently eject the blood back into the body's circulation. This results in fluid leakage from the blood vessels into the lung tissues, causing pulmonary edema and potentially leading to suffocation if untreated.
Right-side failure, on the other hand, leads to peripheral congestion. Here, blood pools in the body's organs and tissues. The resulting edema or fluid retention can impair cells' ability to obtain nutrients and oxygen and remove waste. This condition is often visible as swelling in extremities like feet, ankles, and fingers.
Several conditions can lead to CHF. Coronary atherosclerosis, where fatty buildups clog the coronary arteries, deprives heart cells of oxygen, making them contract ineffectively. Persistent high blood pressure can also lead to CHF by overworking the heart muscle, causing it to weaken over time. Multiple heart attacks can damage the heart and leave noncontractile scar tissue, reducing the heart's pumping efficiency. Dilated cardiomyopathy (DCM) is a condition where the heart's main pumping chamber, the left ventricle, becomes enlarged and weakened. This dilatation reduces the heart's efficiency, leading to impaired blood flow and increased risk of arrhythmias. The exact cause of DCM can vary, including genetic mutations, infections, toxins, and autoimmune reactions.

Congestive heart failure, or CHF, can reduce the heart's pumping efficiency.
In CHF, an increase in preload excessively stretches the myocardium, ...

Education

JoVE Core

Anatomy and Physiology

Unit 1

The Heart

KEY TERMS AND CONCEPTS

congestive heart failure causes and effects

Congestive heart failure (CHF) happens when the heart becomes an inefficient pump. The heart normally keeps blood leaving the heart and blood returning to it in balance. When that balance is disrupted, blood circulation drops and the body does not get enough flow.

CHF can affect the left side of the heart, the right side, or both. Left-side failure can cause pulmonary congestion, which means blood backs up in the lungs. The right side may still send blood to the lungs, but the left side cannot move it back into the body well. Fluid can then leak from blood vessels into lung tissue. This leads to pulmonary edema, and if it is not treated, it can cause suffocation.

Right-side failure causes peripheral congestion. In this case, blood pools in organs and tissues throughout the body. The extra fluid, or edema, can make it harder for cells to get oxygen and nutrients and to remove waste. Swelling is often visible in the feet, ankles, and fingers.

Several conditions can lead to CHF. Coronary atherosclerosis is one cause. In this condition, fatty buildup blocks the coronary arteries and cuts off oxygen to heart cells, so they contract poorly. Persistent high blood pressure can also weaken the heart over time because it forces the heart muscle to work too hard. Multiple heart attacks can damage the heart and leave behind scar tissue that does not contract.

Dilated cardiomyopathy, or DCM, is another cause of CHF. In DCM, the left ventricle, which is the main pumping chamber, becomes enlarged and weakened. This dilation lowers pumping efficiency and raises the risk of arrhythmias, which are abnormal heart rhythms. DCM can be linked to genetic mutations, infections, toxins, or autoimmune reactions.

Congestive Heart Failure Causes and Effects

congestive-heart-failure-causes-and-effects

overview of the heart

How the Heart Pumps Blood

The heart is a muscular organ in the chest that pumps blood through the body. It works as the main pump of the vascular system. The heart has four chambers. The two atria are on top, and the two ventricles are below. Blood enters the right atrium from the body as deoxygenated blood, which means it has less oxygen. It then moves to the right ventricle. The right ventricle pumps this blood to the lungs for oxygenation. Oxygenated blood returns from the lungs to the left atrium. It then passes to...

location and orientation of the heart

Heart Position, Apex, and Pericardium

The human heart sits in the mediastinum, the middle space of the thorax. It is about the size of a fist and weighs about 250 to 350 grams. The heart lies on the superior surface of the diaphragm and extends obliquely for about 12 to 14 cm. The heart is positioned anterior to the vertebral column and posterior to the sternum. About two-thirds of its mass lies to the left of the midsternal line. The lungs lie on either side of the heart. The broad base of the heart points toward the right...

layers of the heart wall

Heart Wall Layers and Their Roles

The heart wall has three layers: the epicardium, myocardium, and endocardium. Each layer has a different structure and job. Together, they help the heart pump blood through the body. The outermost layer is the epicardium. It is the visceral layer of the serous pericardium. This layer has a thin, transparent mesothelial surface and an inner layer of areolar connective tissue. Fat deposits are also found here, and they increase with age. The myocardium is the thickest layer of the heart wall.

chambers of the heart

Heart Chambers and Blood Flow Pathway

The heart chambers work together to move blood through the body and the lungs. The human heart has four chambers: the right atrium, right ventricle, left atrium, and left ventricle. The atria are the upper chambers, and the ventricles are the lower chambers. They are separated by the interatrial septum and the interventricular septum. The outside of the heart also shows clear dividing lines. The coronary sulcus separates the atria from the ventricles. The anterior and posterior...

heart valves

How Heart Valves Prevent Backflow

The heart valves keep blood moving in one direction through the heart. The main valve groups are the atrioventricular, or AV, valves and the semilunar valves. Together, they help stop blood from flowing backward as the heart chambers contract and relax. The AV valves stop blood from moving back into the atria when the ventricles contract. They work with the chordae tendineae, which are tough cord-like strands, and the papillary muscles. When the ventricles relax, the chordae tendineae are...

overview of systemic and pulmonary circulation

overview-of-systemic-and-pulmonary-circulation

Pathway of Blood Through Heart and Lungs

The circulatory system moves blood in two linked routes: pulmonary circulation and systemic circulation. Together, these circuits carry blood between the heart, the lungs, and the rest of the body. Pulmonary circulation comes first in this cycle. In pulmonary circulation, deoxygenated blood is pumped from the right ventricle to the lungs through the pulmonary trunk and pulmonary arteries. In the lungs, the blood picks up oxygen. It then returns to the heart through the pulmonary veins and...

coronary circulation

How the Heart Gets Its Blood

Coronary circulation is the blood supply that keeps the heart muscle alive. The heart does not use the same blood it pumps to feed itself. Instead, it depends on a separate vessel network that delivers oxygen and nutrients to the myocardium, or heart muscle. This is the shortest circulation in the body. Coronary circulation begins at the base of the aorta, where the left and right coronary arteries arise. These arteries wrap around the heart in the coronary sulcus and send blood inward to the...

conduction system of the heart

How the Heart Sets Its Own Beat

The heart sets its own beat through autorhythmicity, which is its built-in ability to generate electrical signals and start muscle contractions. This process depends on a self-regulating conduction system. It includes pacemaker cells and specialized conducting cells. Pacemaker cells are found in two main nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node can depolarize on its own. That electrical change starts an action potential that causes the atria to contract. <br...

electrocardiogram

Reading Heart Waves on an ECG

An electrocardiogram, or ECG/EKG, records the heart’s electrical signals during each heartbeat. Electrodes are placed on the arms, legs, and chest. The electrocardiograph then amplifies the signals and creates 12 tracings that show the heart’s electrical activity from different views. A normal ECG has three main waveforms. The P wave shows atrial depolarization, which is the spread of action potentials through the atria. The QRS complex shows rapid ventricular depolarization, and the T wave...

cardiac cycle

Heartbeat Stages and Valve Action

The heartbeat follows a set of stages that move blood through the heart. This process is driven by changes in pressure and by the opening and closing of the heart valves. It includes systole, or contraction, and diastole, or relaxation. The sequence starts in mid-to-late diastole, when the heart is fully relaxed. During this time, blood flows passively from the atria into the ventricles. Atrial systole then begins as the atria contract and push the remaining blood into the ventricles. Next...

correlation between ecg and cardiac cycle

correlation-between-ecg-and-cardiac-cycle

ECG Waves Across the Cardiac Cycle

ECG waves show how the heart’s electrical signals line up with the cardiac cycle. The electrical activity appears before the heart muscle’s mechanical contraction and relaxation. On an electrocardiogram, the main waves help link each electrical event to a specific stage of the heartbeat. A cardiac action potential starts in the SA node, or sinoatrial node, and spreads through the atria and the AV node in about 0.03 seconds. This creates the P wave on the ECG and triggers atrial contraction.

disturbances in heart rhythm

Heart Rhythm Disorders and Emergency Care

Heart rhythm disorders, also called arrhythmias or dysrhythmias, happen when the heart’s conduction system has a defect. They can make the heart beat irregularly, too fast, or too slow. People may notice chest pain, shortness of breath, or fainting. Many things can trigger an arrhythmia. Stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte imbalances are all possible causes. These triggers can disrupt the electrical signals that control the...

heart sounds

Auscultation and Normal Heart Sounds

Auscultation is the process of listening to internal body sounds with a stethoscope. Heart sounds are created by turbulence in blood flow when the heart valves close. These sounds are usually heard best a little away from the valves, where the blood flow spreads the sound. The heart makes four types of sounds, but a stethoscope usually picks up only S1 and S2. S1 is the “lub” sound. It happens when the atrioventricular, or A-V, valves close at the start of ventricular systole. S1 is usually...

cardiac output and stroke volume

How Heart Rate Shapes Cardiac Output

Cardiac output shows how much blood the heart pumps each minute. It is the volume ejected by the left or right ventricle into the aorta or pulmonary trunk. Heart rate and stroke volume work together to set this value. Heart rate is the number of heartbeats per minute, and stroke volume is the amount of blood pumped out with each beat. Cardiac output is found by multiplying heart rate by stroke volume. In an average resting adult male, it is about 5.25 L/min. That estimate uses a heart rate of...

regulation of stroke volume

Stroke Volume: Preload to Afterload

Stroke volume depends on preload, contractility, and afterload. These three factors work together to control how much blood a ventricle ejects with each heartbeat. Understanding them helps explain how the heart keeps blood moving through the circulatory system. Preload is the stretch on the heart before it contracts. It is linked to the Frank-Starling law of the heart, which says that when the heart fills with more blood during diastole, it contracts more forcefully during systole. Preload is...

regulation of heart rates

How the Heart Adjusts Its Beat

Heart rate changes through signals from the autonomic nervous system, hormones, and the heart's own built-in control systems. The autonomic nervous system has two main parts. The sympathetic nervous system raises heart rate, and the parasympathetic nervous system lowers it. The sympathetic nervous system releases norepinephrine and epinephrine. These chemicals act on beta-1 adrenergic receptors in the heart. They increase the rate of depolarization in the sinoatrial (SA) node, which is the...

exercise and cardiac output

How Exercise Strengthens the Heart

Exercise strengthens the heart and improves cardiovascular health. Aerobic exercise is especially effective. The American Heart Association recommends 150 minutes of moderate to intense aerobic exercise each week for a healthy heart. Brisk walking, running, bicycling, cross-country skiing, and swimming are all examples. These activities are best done three to five times per week. During sustained exercise, muscles need more oxygen. The body meets this demand through enough cardiac output and...

Congestive heart failure (CHF) happens when the heart becomes an inefficient pump. The heart normally keeps blood leaving the heart and blood returning to it in balance. When that balance is disrupted, blood circulation drops and the body does not get enough flow. CHF can affect the left side of the heart, the right side, or both. Left-side failure can cause pulmonary congestion, which means blood backs up in the lungs. The right side may still send blood to the lungs, but the left side cannot...

development of the heart

Heart Tube Formation and Folding

Heart tube formation and folding shape the early human heart. The process begins in the mesoderm, a middle layer of embryonic tissue, on day 18 or 19 after fertilization. It starts in the cardiogenic area, a group of mesodermal cells at the head end of the embryo. These cells extend into cardiogenic cords and then change into hollow endocardial tubes. As the embryo folds from side to side, the paired tubes move closer together. They join into one primitive heart tube by day 21. By day 22, this...

key terms and concepts

Learn how congestive heart failure affects left and right heart function, causes pulmonary and peripheral congestion, and links to atherosclerosis and DCM.

Congestive Heart Failure Causes and Effects | JoVE K12

anatomy and physiology

JoVE Core Anatomy and Physiology showcases the anatomical and physiological details of the human body in comprehensive, clear, and engaging video animations. This collection of lessons focuses on the structures, components, functions, and requirements of the human body. It is complemented by scientist-in-action videos that demonstrate the application of this knowledge in real-world medical and research settings.

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Layers of the Heart Wall

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Chambers of the Heart

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Heart Valves

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Coronary Circulation

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Cardiovascular System

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Congestive Heart Failure Causes and Effects

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