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Re-entry ventricular arrhythmia is a type of paroxysmal tachycardia occurring in the ventricle where the cause of the arrhythmia is due to the electric signal not completing the normal circuit, but rather an alternative circuit looping back upon itself. [1] There develops a self-perpetuating rapid and abnormal activation.
If the symptoms are present while the person is receiving medical care (e.g., in an emergency department), an ECG may show typical changes that confirm the diagnosis i.e., QRS duration <120 ms, unless a heart block is suspected. [7] If the palpitations are recurrent, a doctor may request a Holter monitor (portable, wearable ECG recorder). Again ...
They are generally due to one of two mechanisms: re-entry or increased automaticity. [3] Diagnosis is typically by electrocardiogram (ECG), Holter monitor, or event monitor. [4] Blood tests may be done to rule out specific underlying causes such as hyperthyroidism, pheochromocytomas, or electrolyte abnormalities. [4]
The underlying mechanism typically involves an accessory pathway that results in re-entry. [3] Diagnosis is typically by an electrocardiogram (ECG) which shows narrow QRS complexes and a fast heart rhythm typically between 150 and 240 beats per minute. [3] Vagal maneuvers, such as the Valsalva maneuver, are often used as the initial treatment. [4]
Cardiology Atrioventricular reentrant tachycardia ( AVRT ), or atrioventricular reciprocating tachycardia , is a type of heart arrhythmia with an abnormally fast rhythm ( tachycardia ); it is classified as a type of supraventricular tachycardia (SVT).
To make the diagnosis, there must be at least 3 different P-wave morphologies in a single ECG lead due to the shifting of the pacemaker in the atria. [1] This is different from normal sinus rhythm where one will see the same P-wave morphology through the same lead because each beat is started from the SA node. The P-wave is normally upright or ...
Cardiac stress testing is used to determine to assess cardiac function and to disclose evidence of exertion-related cardiac hypoxia. Radionuclide testing using thallium or technetium can be used to demonstrate areas of perfusion abnormalities. With a maximal stress test the level of exercise is increased until the person's heart rate will not ...
Cardiology, electrophysiology Atrial tachycardia is a type of heart rhythm problem in which the heart 's electrical impulse comes from an ectopic pacemaker (that is, an abnormally located cardiac pacemaker ) in the upper chambers ( atria ) of the heart, rather than from the sinoatrial node , the normal origin of the heart's electrical activity .
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