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There are 6 different sinus arrhythmia. [1] [2]A normal heart should have a normal sinus rhythm, this rhythm can be identified by a ventricular rate of 60-100 bpm, at a regular rate, with a normal PR interval (0.12 to 0.20 second) and a normal QRS complex (0.12 second and less).
The whole ECG course on 1 A4 paper from ECGpedia, a wiki encyclopedia for a course on interpretation of ECG; Wave Maven – a large database of practice ECG questions provided by Beth Israel Deaconess Medical Center; PysioBank – a free scientific database with physiologic signals (here ecg) EKG Academy – free EKG lectures, drills and quizzes
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In clinical practice, therefore, factors that would lead to the right conditions to favour such re-entry mechanisms include increased heart size through hypertrophy or dilatation, drugs which alter the length of the refractory period and areas of cardiac disease. Therefore, the substrate of ventricular fibrillation is transient or permanent ...
A sinus rhythm is any cardiac rhythm in which depolarisation of the cardiac muscle begins at the sinus node. [1] It is necessary, but not sufficient, for normal electrical activity within the heart. [2] On the electrocardiogram (ECG), a sinus rhythm is characterised by the presence of P waves that are normal in morphology. [2]
R in V5 or V6 < 2.6 mV; Increased amplitude indicates cardiac hypertrophy: Ventricular activation time (VAT) < 50 ms in V5 or V6 [4] < 30 ms in V1 [4] Measured in increased QRS amplitude [4] Q wave: Duration up to 40 ms in leads other than III and aVR [6] Amplitude less than 1/3 QRS amplitude [6] (R+S) Amplitude less than 1/4 of R wave [6]
The QT interval is a measurement made on an electrocardiogram used to assess some of the electrical properties of the heart.It is calculated as the time from the start of the Q wave to the end of the T wave, and approximates to the time taken from when the cardiac ventricles start to contract to when they finish relaxing.
Wandering atrial pacemaker (WAP) is an atrial rhythm where the pacemaking activity of the heart originates from different locations within the atria. [1] This is different from normal pacemaking activity, where the sinoatrial node (SA node) is responsible for each heartbeat and keeps a steady rate and rhythm. Causes of wandering atrial ...
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