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23 Μαΐ 2023 · Presence of a Northwest axis (-90 to -180 degrees) is highly specific for VT (90%). Look for a dominant R wave in aVR for quick reference. Always consider metabolic disturbance (K, Na channel blockade, acidosis). Use a cut-off of > 200ms, which has a specificity of 85-90% for VT.
- Lewis Lead
History of the Lewis lead. Sir Thomas Lewis (1881-1945)...
- Lewis Lead
8 Οκτ 2024 · Regular broad complex tachycardias can be ventricular (VT) or supraventricular (SVT with aberrancy) in origin, and differentiation between the two will significantly influence management of your patients.
Comparing junctional rhythm vs SVT, the most noticeable differences are the heart rate and the origin of the rhythms. While junctional rhythm is generally slower (40-60 bpm) and originates from the AV node, non-sustained SVT is faster (over 100 bpm) and comes from the atria or the part of the AV node above the bundle of His.
8 Οκτ 2024 · ECG features: P waves are often hidden – being embedded in the QRS complexes; Pseudo R’ wave may be seen in V1 or V2; Pseudo S waves may be seen in leads II, III or aVF; In most cases this results in a ‘typical’ SVT appearance with absent P waves and tachycardia
ECG criteria for junctional rhythm. Regular ventricular rhythm with rate 40–60 beats per minute. Retrograde P-wave before or after the QRS, or no visible P-wave. The QRS complex is generally normal, unless there is concomitant intraventricular conduction disturbance. Figure 1 (below) displays two ECGs with junctional escape rhythm.
5 Νοε 2024 · FAT: ~100-180 b/m (but can range up to 250 b/m). Junctional tachycardia: usually ~100-140 b/m (but may increase to 220). Sinus node reentry tachycardia: ~100-150 b/m. [1] Heart rate > (220 – age) rates suggest a non-sinus mechanism. Catecholamine surge. Sympathomimetic toxicity. Hyperthyroidism or thyroid storm. AF with accessory pathway.
8 Νοε 2021 · Supraventricular tachycardia (SVT) occurs when the heart rhythm occurs as a result of electrical impulses initiated above the ventricles at a rate of 150 - 250 bpm or more. What will remain will be a normal appearing and measuring QRS complex depolarizing at a rapid rate.
