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Arrhythmias
Alternate Names : Abnormal Heart Rhythms, Dysrhythmias
Pictures & Images
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Heart, Front View
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The external structures of the heart include the ventricles, atria, arteries and veins. Arteries carry blood away from the heart while veins carry blood into the heart. The vessels colored blue indicate the transport of blood with relatively low content of oxygen and high content of carbon dioxide. The vessels colored red indicate the transport of blood with relatively high content of oxygen and low content of carbon dioxide.
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Atrioventricular Block, EKG Tracing
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This picture shows an ECG (electrocardiogram, EKG) of a person with an abnormal rhythm (arrhythmia) called an atrioventricular (AV) block. P waves show that the top of the heart received electrical activity. Each P wave is usually followed by the tall (QRS) waves. QRS waves reflect the electrical activity that causes the heart to contract. When a P wave is present and not followed by a QRS wave (and heart contraction), there is an atrioventricular block, and a very slow pulse (bradycardia).
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Normal Heart Rhythm
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An electrocardiogram (ECG) test measures the electrical activity of the heart. A normal resting heart rate is 60 - 100 beats per minute.
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Bradycardia
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Bradycardia heart rhythms are characterized by a slowness of the heartbeat, usually at a rate under 60 beats per minute (normal resting rate is 60 - 100 beats per minute).
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Ventricular Tachycardia
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Ventricular tachycardia is a rapid resting heart rate initiated within the ventricles, typically at 160 - 240 beats per minute (normal resting rate is 60 - 100 beats per minute).
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Conduction System of the Heart
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The intrinsic conduction system sets the basic rhythm of the beating heart by generating impulses which stimulate the heart to contract.
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Jump to another section
• Definition
• Arrhythmias Overview, Causes, & Risk Factors
• Arrhythmias Symptoms & Signs
• Arrhythmias Prevention
• Arrhythmias Diagnosis & Tests
• Arrhythmias Treatment
• Arrhythmias Prognosis
• Arrhythmias Complications
• Calling Your Health Care Provider
• Pictures & Images
Topics that might be of interest to you Diseases & Conditions
• Angina
• Angina - Stable
• Atrial Fibrillation/Flutter
• Ectopic Heartbeat
• Heart Attack
• Heart Disease
• Heart Failure
• Multifocal Atrial Tachycardia
• Paroxysmal Supraventricular Tachycardia (PSVT)
• Sick Sinus Syndrome
• Stroke
• Ventricular Tachycardia
• Wolff-Parkinson-White Syndrome
Tests & Exams
• Blood Pressure
• CHEM-20
• Coronary Angiography
• ECG
• Echocardiogram
• Holter Monitor (24h)
• Intracardiac Electrophysiology Study (EPS)
• Pulse
Other Topics
• Breathing Difficulty
• Caffeine in the Diet
• Chest Pain
• CPR
• Dizziness
• Fainting
• Heartbeat Sensations
• Implantable Cardioverter-Defibrillator
• Paleness
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