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1. litfl.com › q-waQ Wave • LITFL • ECG Library Basics

   litfl.com › q-wa

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   8 Οκτ 2024 · Learn about Q wave morphology and interpretation on ECG. Q wave is a negative deflection before R wave, usually seen in septal leads, and may be pathological in V1-3 leads.

   • Myocardial Infarction

     Deep Q waves in V1-3 with markedly reduced R wave height in...

   • Qrs Interval

     Right bundle branch block produces an RSR’ pattern in V1 and...

   • St Segment

     Morphology of ST Depression. ST depression can be either...

   • P Wave

     P waves should be upright in leads I and II, inverted in...

   • Qt Interval

     Left, middle: Smaller U waves and those that are separate...

   • J Point

     Naming of the waves in the ECG, with a brief account of...

2. en.my-ekg.com › basic-principles › q-waveThe Q Wave - My EKG

   en.my-ekg.com › basic-principles › q-wave

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   19 Μαΐ 2024 · Q wave is the initial downward stroke of the QRS complex in ventricular depolarization. Learn how to identify normal and abnormal Q waves on EKG, and their causes and implications for myocardial infarction and stroke.

3. ecgwaves.com › topic › ecg-criteria-myocardial-infarction-pathological-q-waves-r-wavesECG signs of myocardial infarction: pathological Q-waves &...

   ecgwaves.com › topic › ecg-criteria-myocardial-infarction-pathological-q-waves-r-waves

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   Lead III occasionally displays a large isolated Q-wave; this is called a respiratory Q-wave, because its amplitude varies with respiration. Lead III may also display small Q-waves (not related to respiration) in individuals with electrical axis -30° to 0°.

4. www.uptodate.com › contents › pathogenesis-and-diagnosis-of-q-waves-on-thePathogenesis and diagnosis of Q waves on the electrocardiogram

   www.uptodate.com › contents › pathogenesis-and-diagnosis-of-q-waves-on-the

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   9 Μαΐ 2023 · Q waves are negative deflections of the QRS complex that can indicate myocardial injury, replacement, or enlargement. Learn how to recognize Q waves on ECG and differentiate them from other factors that can affect their appearance.

5. en.ecgpedia.org › wiki › Pathologic_Q_WavesPathologic Q Waves - ECGpedia

   en.ecgpedia.org › wiki › Pathologic_Q_Waves

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   8 Ιαν 2012 · Pathologic Q waves are a sign of previous myocardial infarction. They are the result of absence of electrical activity. A myocardial infarction can be thought of as an elecrical 'hole' as scar tissue is electrically dead and therefore results in pathologic Q waves.

6. ecgwaves.com › ecg-qrs-complex-q-r-s-wave-duration-intervalThe QRS complex: ECG features of the Q-wave, R-wave, S-wave &...

   ecgwaves.com › ecg-qrs-complex-q-r-s-wave-duration-interval

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   Learn how the QRS complex is composed of Q-, R- and S-waves that reflect ventricular depolarization. Understand the electrical vectors, naming rules, net direction and duration of the QRS complex and its implications for pathology.

7. emcrit.org › ibcc › q-wavesQ-waves - EMCrit Project

   emcrit.org › ibcc › q-waves

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   Q-waves may cause abnormal depolarization, leading to abnormal repolarization (e.g., abnormalities in the ST/T wave segments; see example below). QRS with normal length (<120 ms) with any of the following in two contiguous leads. Additional R wave (s) (i.e., RSR'). Notching of the nadir of the S wave.