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Ventricular tachycardia (V-tach or VT) is a cardiovascular disorder in which fast heart rate occurs in the ventricles of the heart. [3] Although a few seconds of VT may not result in permanent problems, longer periods are dangerous; and multiple episodes over a short period of time are referred to as an electrical storm.
Focal V-tach is where a specific area of the ventricle has abnormal automaticity. The automaticity rate is the frequency at which a cell sends out a signal, so for the pacemaker cells in the SA node the rate is between about 60 and 100 signals per minute, resulting in 60 to 100 beats per minute, let’s just say 60 beats per minute, so one beat ...
The term "Catecholaminergic Polymorphic Ventricular Tachycardia" was first used in 1978. [5] In 1999, the first genetic mutation causing CPVT to be identified was localised to chromosome 1q42-q43, [ 31 ] which was found to be a variant in the RYR2 gene in 2001. [ 6 ]
A diagrammatic sign or diagrammatic guide sign is a type of guide sign that indicates destinations using a large, map-like illustration of the road layout. The term is most commonly associated with diagrammatic signs installed ahead of forks in controlled-access highways to indicate the destination of each lane.
The U.S. adoption of several Vienna Convention-inspired symbol signs during the 1970s was a failure. For example, the lane drop symbol sign was criticized as baffling to U.S. drivers—who saw a "big milk bottle"—and therefore quite dangerous, since by definition it was supposed to be used in situations where drivers were about to run out of road and needed to merge into another lane ...
This sign, or some variation thereof, is used to denote controlled-access highways in many countries. Typical overhead signage on Ontario's King's Highway network featuring an airport pictogram, distances to upcoming interchanges, and lane guidance
The electrical axis of the heart is the net direction in which the wave of depolarization travels. It is measured using an electrocardiogram (ECG).Normally, this begins at the sinoatrial node (SA node); from here the wave of depolarisation travels down to the apex of the heart.
The hexaxial reference system is a diagram that is used to determine the heart's electrical axis in the frontal plane.. In electrocardiography, left axis deviation (LAD) is a condition wherein the mean electrical axis of ventricular contraction of the heart lies in a frontal plane direction between −30° and −90°.