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8 Οκτ 2024 · ECG features of normal sinus rhythm. Regular rhythm at a rate of 60-100 bpm (or age-appropriate rate in children) Each QRS complex is preceded by a normal P wave. Normal P wave axis: P waves upright in leads I and II, inverted in aVR. The PR interval remains constant.
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Normal adult 12-lead ECG. The diagnosis of the normal electrocardiogram is made by excluding any recognised abnormality. It's description is therefore quite lengthy. normal sinus rhythm. each P wave is followed by a QRS. P waves normal for the subject. P wave rate 60 - 100 bpm with <10% variation. rate <60 = sinus bradycardia.
Consistent PR, QRS, and QT intervals across all leads . Figure 9.3 This 12-lead EKG illustrates normal sinus rhythm (NSR). Each lead displays the characteristic P wave, QRS complex, and T wave, with a consistent and regular rhythm. The heart rate is within the normal range of 60–100 bpm.
If the rhythm is sinus rhythm (i.e. under normal circumstances) the P-wave vector is directed downwards and to the left in the frontal plane and this yields a positive P-wave in lead II (Figure 2, right-hand side). The P-wave is always positive in lead II during sinus rhythm.
Sinus rhythm (which is the normal rhythm) has the following characteristics: (1) heart rate 50–100 beats per minute; (2) P-wave precedes every QRS complex; (3) the P-wave is positive in lead II and (4) the PR interval is constant.
Many of the ECG rhythm strips come from the collection of the late Dr. Alan Lindsay, master teacher of electrocardiography. Most of the 12- and 6-lead ECGs were recorded at LDS Hospital in Salt Lake City, Utah.
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.
