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Related Concept Videos

Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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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.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart...
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The Cardiac Cycle01:13

The Cardiac Cycle

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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and...
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Cardiac Cycle01:29

Cardiac Cycle

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The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
During the cardiac cycle, blood flow through the heart is regulated entirely by changing pressure gradients. This sequence of events begins with the heart in a state of total relaxation, known as mid-to-late diastole, during which blood passively flows from...
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Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be...
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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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Cardiac amyloidosis: The great masquerader.

Jubran Rind1, Nagib Chalfoun1, Richard McNamara2

  • 1Michigan State University School of Human Medicine.

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Cardiac amyloidosis can mimic hypertrophic cardiomyopathy, leading to misdiagnosis. Cardiac MRI and ECG are crucial for accurate diagnosis, differentiating amyloidosis from other cardiomyopathies and guiding treatment.

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Area of Science:

  • Cardiology
  • Cardiovascular Imaging

Background:

  • Cardiac amyloidosis often presents with left ventricular hypertrophy (LVH), mimicking other cardiac conditions.
  • Echocardiographic findings in cardiac amyloidosis can resemble hypertrophic cardiomyopathy (HCM), including asymmetric septal hypertrophy and outflow tract obstruction.

Observation:

  • A 76-year-old male patient presented with cardiomyopathy exhibiting echocardiographic features suggestive of asymmetric HCM.
  • The patient's presentation highlighted the diagnostic challenge posed by overlapping clinical and imaging findings.

Findings:

  • Cardiac magnetic resonance imaging (MRI) and electrocardiography (ECG) were instrumental in correctly diagnosing cardiac amyloidosis.
  • These advanced imaging and diagnostic tools differentiated amyloidosis from HCM in this complex case.

Implications:

  • Accurate differentiation of cardiac amyloidosis from HCM is critical for appropriate patient management.
  • Timely diagnosis through advanced imaging influences treatment strategies and patient outcomes in cardiovascular disease.