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8 Οκτ 2024 · A premature atrial complex (PAC) is a premature beat arising from ectopic pacemaking tissue within the atria. There is an abnormal P wave, usually followed by a normal QRS complex. AKA: Atrial ectopics, atrial extrasystoles, atrial premature beats, atrial premature depolarisations. ECG features of PACs
- Premature Junctional Complex (Pjc)
Electrocardiographic Features. PJCs have the following...
- Premature Ventricular Complex (Pvc)
Premature — i.e. occurs earlier than would be expected for...
- Premature Junctional Complex (Pjc)
Premature atrial contraction on ECG. A premature atrial contraction occurs when an ectopic focus in the atria discharges before the next sinus impulse. The premature impulse may depolarize the atria and subsequently the ventricles, provided that the myocardium and conduction system have repolarized.
8 Αυγ 2023 · Premature atrial contractions (PACs) are contractions of the atria that are triggered by the atrial myocardium but have not originated from the sinoatrial node (SA node). PACs are also commonly referred to as atrial premature complexes (APCs), premature supraventricular complexes, premature supraventricular beat, and premature atrial beat.
8 Οκτ 2024 · Pacemaking impulses arise from the sino-atrial node and are transmitted to the ventricles via the AV-node and His-Purkinje system. This results in a regular, narrow-complex heart rhythm at 60-100 bpm. ECG features of normal sinus rhythm. Regular rhythm at a rate of 60-100 bpm (or age-appropriate rate in children)
Definition (criteria) for sinus rhythm. Regular rhythm with ventricular rate between 50 and 100 beats/min. P-wave with constant morphology preceding every QRS complex. The P-wave is positive in lead II. Figure 1 (below) shows normal sinus rhythm at paper speed 25 mm/s.
11 Ιουλ 2023 · Sinus rhythm is present when the dominant pacemaker controlling impulse generation is the sinus node (waveform 1 and waveform 2). In this setting, activation of the atria is from right to left, superior to inferior, and anterior to posterior. (See "Normal sinus rhythm and sinus arrhythmia".)
23 Ιουν 2013 · A premature atrial complex (PAC). (In this example the atrial p-wave is difficult to discern). A premature atrial complex (PAC) with evident negative p-wave. This ladder diagram shows the three possible faits of an atrial premature complex. First two normal sinus beats are shown. The first atrial extrasystole is conducted normally.
