By Gu Anlin & Wang Zongli
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Additional info for Atlas of Rangeland Plants in Northern China
10 sec None: Absent Beginning of R wave to end of T wave Varies with HR. Normal: Less than half the R-R interval Occur in AV blocks. Occur in sinus arrest. 26 Copyright © 2005 F. A. Davis. 27 Component Pause QRS Complex grouping Notes: BASICS Characteristic Compensatory: Complete pause following a premature atrial contraction (PAC), premature junctional contraction (PJC), or premature ventricular contraction (PVC) Noncompensatory: Incomplete pause following a PAC, PJC, or PVC Bigeminy: Repeating pattern of normal complex followed by a premature complex Trigeminy: Repeating pattern of 2 normal complexes followed by a premature complex Quadrigeminy: Repeating pattern of 3 normal complexes followed by a premature complex Couplets: 2 Consecutive premature complexes Triplets: 3 Consecutive premature complexes Sinoatrial (SA) Node Arrhythmias Note: All ECG strips in this tab were recorded in lead II.
A. Davis. 35 ■ This form of WAP is associated with a ventricular response of Ͼ100 bpm. ■ MAT may be confused with atrial fibrillation (A-fib); however, MAT has a visible P wave. Premature Atrial Contraction (PAC) ■ A single complex occurs earlier than the next expected sinus complex. ■ After the PAC, sinus rhythm usually resumes. PAC ECGs Copyright © 2005 F. A. Davis. 10 sec) ♥ Clinical Tip: In patients with heart disease, frequent PACs may precede paroxysmal supraventricular tachycardia (PSVT), A-fib, or A-flutter.
After the dropped beat, cycles continue on time. 10 sec) ♥ Clinical Tip: Cardiac output may decrease, causing syncope or dizziness. ECGs Copyright © 2005 F. A. Davis. 33 Dropped beat X Atrial Arrhythmias ■ P Waves differ in appearance from sinus P waves. ■ QRS Complexes are of normal duration. Wandering Atrial Pacemaker (WAP) ECGs Copyright © 2005 F. A. Davis. 34 ■ Pacemaker site transfers from the SA node to other latent pacemaker sites in the atria and the AV junction and then moves back to the SA node.
Atlas of Rangeland Plants in Northern China by Gu Anlin & Wang Zongli