Tachycardia: Difference between revisions
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→Differentiation between SVT and VT
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To differentiate between supraventricular tachycardias and ventricular tachycardias a 12 lead ECG is the cornerstone of the diagnostic process. At first, the physician has to make a differentiation between a small or broad complex tachycardia. | To differentiate between supraventricular tachycardias and ventricular tachycardias a 12 lead ECG is the cornerstone of the diagnostic process. At first, the physician has to make a differentiation between a small or broad complex tachycardia. | ||
===Definitions | ===Definitions=== | ||
'''Small complex tachycardia:''' | '''Small complex tachycardia:''' | ||
: QRS duration < 120 ms. | : QRS duration < 120 ms. | ||
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: A broad complex tachycardia can be due to a SVT with aberration, pre-exited tachycardia (eg antidrome re-entry tachycardia) or VT. | : A broad complex tachycardia can be due to a SVT with aberration, pre-exited tachycardia (eg antidrome re-entry tachycardia) or VT. | ||
===Differentiation | ===Differentiation=== | ||
(Figure 1, small complex tachy algorithm) | (Figure 1, small complex tachy algorithm) | ||
(Figure 2, broad complex tachy algorithm) | (Figure 2, broad complex tachy algorithm) | ||
===Treatment | ===Treatment=== | ||
'''Haemodynamical instability (systolic blood pressure less than 100 mmHg):''' | '''Haemodynamical instability (systolic blood pressure less than 100 mmHg):''' | ||