2024年10月8日 · The most common cause of PVT is myocardial ischaemia/infarction. Torsades de pointes (TdP) is a specific form of PVT occurring in the context of QT prolongation — it has a characteristic morphology in which the QRS complexes “twist” around the isoelectric line.

2021年9月7日 · Polymorphic ventricular tachycardia (VT) is a malignant ventricular tachyarrhythmia with changing QRS pattern that will either terminate spontaneously (causing syncope if it lasts more than a few seconds) or will deteriorate to ventricular fibrillation (VF), causing cardiac arrest.

Learn all about pulseless ventricular tachycardia. We share an in-depth list of symptoms, describe treatment and management processes.

2020年7月19日 · 心室纖維顫動(vf)及無脈性心室頻脈(pvt) 心跳停止，80-90%是由於心室纖維顫動(Ventricular fibrillation ,VF)所引起。 因此如何制止VF，而不致演變成無法挽救之心跳停止，是急救的重點。

2021年9月12日 · Torsade de pointes（法語意思的“點扭轉”）是 Dessertenne 創造，描述完全性房室傳導阻滯引起的長QT症候群 (LQTS) 引起的多形性VT。 最初的描述是指具有“進行性改變的快速性心律不整” QRS 波群的形態、幅度和極性，其峰值圍繞等電基線扭曲。 ”正如其他地方所述，Dessertenne當時並沒有認識到長QT與他所描述的心律不整之間的因果關係。 然而，“尖端扭轉性室速”很快被用於所有形式的 LQTS 相關快速性心律不整。 在多個ECG導程中時，所有形式 …

2023年7月31日 · ECG findings usually include regular R-R intervals, rapid ventricular rate with an undistinguishable atrial rate (absence of p-waves), AV dissociation, and a wide QRS complex (more than 0.12 sec). Several ECG criteria have been created to help diagnose VT. These criteria include: The Classical Criteria:

Polymorphic VT has QRS complexes greater than or equal to .12 second (120 milliseconds). QRS complexes may appear wider or higher than monomorphic (or other types of) VT. Because the electrical impulses and circuitry for this type of VT originate in various locations within the ventricles, the QRS morphology will also be asymmetrical.

2025年2月10日 · The main signs of pVT are: Fast, regular rhythm with wide QRS complexes. No pulse due to the rapid contractions being ineffective. Heart rate is elevated but usually regular in nature. ECG Findings: Shows wide QRS complexes with a regular rhythm, typically above 150 bpm, but still lacking the ability to pump blood effectively

Polymorphic ventricular tachycardia, also known as catecholaminergic polymorphic ventricular tachycardia, is characterized by symptoms including dizziness, palpitations, and presyncope symptoms, and may progress to syncope, ventricular fibrillation, and sudden cardiac death[50,51].

2016年11月14日 · Polymorphic ventricular tachycardia (PVT) is a form of ventricular tachycardia in which there are multiple ventricular foci with the resultant QRS complexes varying in amplitude, axis and duration. The commonest cause of PVT is myocardial ischaemia.