Cardiac dysrhythmias
- any variation from the normal rhythm or rate of the heart beat.
- Any variation from the normal rate or rhythm (which may include the origin of the impulse and/or its subsequent propagation) in the heart.
Paroxysmal supraventricular tachycardia
- An episodic form of atrial tachycardia, with abrupt onset and termination.
- An episodic form of supraventricular tachycardia, with abrupt onset and termination.
Paroxysmal ventricular tachycardia
- An episodic form of ventricular tachycardia, with abrupt onset and termination.
- An abnormally rapid ventricular rhythm with aberrant ventricular excitation, usually in excess of 150 beats per minute.
- A tachycardia arising distal to bundle of His, with a rate greater than 100 beats per minute.
- A tachycardia arising distal to bundle of His, with a rate greater than 100 beats per minute. (NCI)
Paroxysmal tachycardia unspecified
Atrial fibrillation and flutter
Atrial fibrillation
- disorder of cardiac rhythm characterized by rapid, irregular atrial impulses and ineffective atrial contractions.
- An arrhythmia in which minute areas of the atrial myocardium are in various uncoordinated stages of depolarization and repolarization; instead of intermittently contracting, the atria quiver continuously in a chaotic pattern, causing a totally irregular, often rapid ventricular rate.
- A supraventricular arrhythmia characterized by uncoordinated atrial myocardium activation due to multiple reentry circuits with consequent deterioration of atrial mechanical function. Instead of intermittently contracting, the atria quiver continuously in a chaotic pattern, causing a totally irregular, often tachycardia ventricular rate. On the ECG it is described by the replacement of consistent P waves by rapid oscillations or fibrillatory waves that vary in size, shape, and timing, associated with an irregular, frequently rapid ventricular response when atrioventricular conduction is intact.
- A supraventricular arrhythmia characterized by uncoordinated atrial myocardium activation due to multiple reentry circuits with consequent deterioration of atrial mechanical function. Instead of intermittently contracting, the atria quiver continuously in a chaotic pattern, causing a totally irregular, often tachycardia ventricular rate. On the ECG it is described by the replacement of consistent P waves by rapid oscillations or fibrillatory waves that vary in size, shape, and timing, associated with an irregular, frequently rapid ventricular response when atrioventricular conduction is intact. (NCI)
Atrial flutter
- An electrocardiographic finding of an organized rhythmic contraction of the atria which generally at a rate of 200-300 beats per minute. (NCI)
Ventricular fibrillation and flutter
Ventricular fibrillation
- arrhythmia characterized by fibrillary contractions of the ventricular muscle due to rapid repetitive excitation of myocardial fibers without coordinated contraction of the ventricle.
- An arrhythmia characterized by an irregular pattern of high or low-amplitude waves that cannot be differentiated into QRS complexes or T waves. These electrocardiographic waves occur as a result of fibrillary contractions of the ventricular muscle due to rapid repetitive excitation of myocardial fibers without coordinated contraction of the ventricle. (NCI)
Ventricular flutter
- A ventricular tachyarrhythmia characterized electrocardiographically by smooth undulating waves with QRS complexes merged with T waves, a rate of approximately 250 per minute.
- A ventricular tachyarrhythmia characterized by a high ventricular rate (180 and 250 beats per minute) with a regular rhythm. The electrocardiogram shows large oscillating sine wave-like complexes occurring as a result of QRS complexes and T waves being merged. The P wave is not visible. (NCI)
Cardiac arrest
- cessation of the heart beat.
- Cardiac standstill or arrest; absence of a heartbeat.
- Sudden cessation of the pumping function of the heart, with disappearance of arterial blood pressure, connoting either ventricular fibrillation or ventricular standstill.
- Cessation of breathing and/or cardiac function.
Premature beats
Premature beats unspecified
Supraventricular premature beats
- Ectopic impulses originating in the atria.
- Ectopic impulses originating in the atria. (NCI)
Other premature beats
Other specified cardiac dysrhythmias
Sinoatrial node dysfunction
- A constellation of signs and symptoms which may include syncope, fatigue, dizziness, and alternating periods of bradycardia and atrial tachycardia, which is caused by sinoatrial node dysfunction.
- A constellation of signs and symptoms which may include syncope, fatigue, dizziness, and alternating periods of bradycardia and atrial tachycardia, which is caused by sinoatrial node dysfunction. (NCI)
- A derangement in the normal functioning of the sinoatrial node. Typically, SA node dysfunction is manifest as sinoatrial exit block or sinus arrest, but may present as an absolute or relative bradycardia in the presence of a stressor. It may be associated with bradycardia-tachycardia syndrome
- A derangement in the normal functioning of the sinoatrial node. Typically, SA node dysfunction is manifest as sinoatrial exit block or sinus arrest, but may present as an absolute or relative bradycardia in the presence of a stressor. It may be associated with bradycardia-tachycardia syndrome. (NCI)
Other specified cardiac dysrhythmias
- An arrhythmia originating from within the atrioventricular node.
- A derangement in the normal functioning of the sinoatrial node. Typically, SA node dysfunction is manifest as sinoatrial exit block or sinus arrest, but may present as an absolute or relative bradycardia in the presence of a stressor. It may be associated with bradycardia-tachycardia syndrome
- A derangement in the normal functioning of the sinoatrial node. Typically, SA node dysfunction is manifest as sinoatrial exit block or sinus arrest, but may present as an absolute or relative bradycardia in the presence of a stressor. It may be associated with bradycardia-tachycardia syndrome. (NCI)
- A condition characterized by the site of origin of impulses, controlling the heart rate, changing within the atria, including the sinus node. Variations within P waves and PR intervals occur and an irregular rate of impulse formation is observed.
- A condition characterized by the site of origin of impulses, controlling the heart rate, changing within the atria, including the sinus node. Variations within P waves and PR intervals occur and an irregular rate of impulse formation is observed. (NCI)
Cardiac dysrhythmia unspecified
- any variation from the normal rhythm or rate of the heart beat.
- Any variation from the normal rate or rhythm (which may include the origin of the impulse and/or its subsequent propagation) in the heart.
