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www.ecgwaves.com | Learn ECG Interpretation Online ♥ P-wave amplitude should be ≤2,5 mm (all leads). PR interval must be 0,12–0,22 s (all leads). ♥ P mitrale: increased P-wave duration, enhanced second hump in lead II and enhanced negative deflection in V1. ♥ P pulmonale: increased P-wave amplitudes in lead II and V1.
P-R interval • This is measured from the start of the P-wave to the start of the QRS complex. • The P-R interval should be between 120-200ms (3-5 small squares). o If it is < 120ms then there may be an accessory pathway present such as in Wolf-Parkinson-White syndrome. o If it is > 200ms then the patient has a degree of heart block.
4 lut 2021 · The PR segment is the flat, usually isoelectric segment between the end of the P wave and the start of the QRS complex. PR segment abnormalities. These occur in two main conditions: Pericarditis. Atrial ischaemia. Pericarditis. The characteristic changes of acute pericarditis are: PR segment depression.
• P-R segment: Extends from the end of the P wave until the beginning of the QRS complex and reflects an isoelectric period. • QRS complex: Represents ventricular depolarization (contraction). The Q is downward deflection; R, upward, and S down (in most leads). The duration is usually 0.06 to 0.10 second. Prolongation of the QRS
The segments of the ECG. What do the segments of the ECG represent? P-wave: Atrial contraction. PR interval: Represents the time taken for excitation to spread from the sino-atrial (SA) node across the atrium and down to the ventricular muscle via the bundle of His. QRS: Ventricular contraction. ST segment: Ventricular relaxation.
ECG Criteria (see next page for expanded table of contents) ..... 525 Index of Cases ................................................................. 555 ECG Criteria (Section 4)
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