Tachycardia: Difference between revisions
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=Differentiation between SVT and VT= | =Differentiation between SVT and VT= | ||
Differentiation between supraventricular tachycardias (SVT) and ventricular tachycardias (VT) can be challenging, especially in acute emergency settings. SVT's are rhythm disturbances in the atria or AV-nodal ring or rhythm disorders in which these structures are involved. VT's are rhythm disorders that only involve the ventricles. It can both take place in the myocardium and the conduction system tissue. | |||
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Definitions:''' | |||
Tachycardia: heartrate above 100 bpm | |||
'''Small complex tachycardia:''' QRS duration < 120 ms. | |||
A small complex tachycardia is most likely to be a SVT. However, also a septal VT or His-tachycardia can appear as a small complex tachycardia. (Figure 1, small complex tachy algorithm) | |||
'''Broad complex tachycardia:''' QRS duration > 120 ms. | |||
A broad complex tachycardia can be due to a SVT with aberration, pre-exited tachycardia (eg antidrome re-entry tachycardia) or VT. (Figure 2, broad complex tachy algorithm) | |||
Revision as of 13:50, 12 May 2011
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Introduction
Tachycardia's are arranged as follows;
Supra-ventricular tachycardia
Atrial arrhythmias
Sinus Tachycardia
Atrial Tachycardia
Atrial Flutter
Atrial Fibrillation
Pathophysiology
Patient characteristics
History
Physical Examination
Investigations
Differential diagnosis
Treatment and Follow up
Prognosis
AV node arrhythmias
AV junctional tachycardia
AVNRT
AVRT
Ventricular tachycardia
Ventricular tachycardia
Ventricular flutter
Ventricular fibrillation
Torsade de Pointes
Differentiation between SVT and VT
Differentiation between supraventricular tachycardias (SVT) and ventricular tachycardias (VT) can be challenging, especially in acute emergency settings. SVT's are rhythm disturbances in the atria or AV-nodal ring or rhythm disorders in which these structures are involved. VT's are rhythm disorders that only involve the ventricles. It can both take place in the myocardium and the conduction system tissue.
Definitions:
Tachycardia: heartrate above 100 bpm
Small complex tachycardia: QRS duration < 120 ms. A small complex tachycardia is most likely to be a SVT. However, also a septal VT or His-tachycardia can appear as a small complex tachycardia. (Figure 1, small complex tachy algorithm)
Broad complex tachycardia: QRS duration > 120 ms. A broad complex tachycardia can be due to a SVT with aberration, pre-exited tachycardia (eg antidrome re-entry tachycardia) or VT. (Figure 2, broad complex tachy algorithm)