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8 paź 2024 · Q waves in different leads. Small Q waves are normal in most leads; Deeper Q waves (>2 mm) may be seen in leads III and aVR as a normal variant; Under normal circumstances, Q waves are not seen in the right-sided leads (V1-3)
- Restrictive Cardiomyopathy
Diffuse myocardial infiltration leads to low voltage QRS...
- ECG Limb Lead Reversal
Leads II, III and aVF all become identical (equivalent to...
- Hypertrophic
Deep narrow Q waves < 40 ms wide in the lateral leads I, aVL...
- Osborn Wave
Eponymous History of the Osborn Wave. 1922 – Kraus described...
- T Wave
Wellens Syndrome. Wellens syndrome is a pattern of inverted...
- Delta Wave
Diagram a: Δ wave represented by a simple tilt of the PQ...
- Epsilon Wave
Epsilon waves are relatively low in sensitivity, manifesting...
- QRS Segment
Right bundle branch block produces an RSR’ pattern in V1 and...
- Restrictive Cardiomyopathy
19 maj 2024 · In limb leads, the Q wave is present in one or more of the inferior leads (leads II, III, aVF) in more than 50% of normal adults and in leads I and aVL in about 50% 2. The duration of the Q wave is of considerable importance in the diagnosis of myocardial infarction.
Pathological Q-waves may resolve in up to 30% of patients with inferior infarction. The amplitude of Q-waves may also diminish over time. Moreover, magnetic resonance imaging has suggested that pathological Q-waves may also arise due to extensive subendocardial infarction (NSTEMI).
9 maj 2023 · By definition, a Q wave on the electrocardiogram (ECG) is an initially negative deflection of the QRS complex. Technically, a Q wave indicates that the net direction of early ventricular depolarization (QRS) electrical forces projects toward the negative pole of the lead axis in question.
1 lis 2024 · Prominent septal Q-waves (I, aVL, V4-V6, occasionally inferior leads). Basically, Q-waves are present in leads with tall, upright QRS complexes. Q-waves may be present in the right or mid-precordial leads when tachycardic. Hyperkalemia: Misleading Q-waves may appear & disappear.
Regardless of which waves are visible, the wave (s) that reflect ventricular depolarization is always referred to as the QRS complex. Naming of the waves in the QRS complex is easy but frequently misunderstood. The following rules apply when naming the waves: A deflection is only referred to as a wave if it passes the baseline.
Q waves are more likely to be seen in the inferior leads when the QRS axis is vertical and in leads I and aVL when the QRS axis is horizontal.
