Q Wave • LITFL • ECG Library Basics
Oct 8, 2024 · The Q Wave. A Q wave is any negative deflection that precedes an R wave. The Q wave represents the normal left-to-right depolarisation of the interventricular septum; Small ‘septal’ Q waves are typically seen in the left-sided leads (I, aVL, V5 and V6)
ECG signs of myocardial infarction: pathological Q-waves
These Q-waves are wider and deeper than normally occurring Q-waves, and they are referred to as pathological Q-waves. They typically emerge between 6 and 16 hours after symptom onset, but may occasionally develop earlier.
Q-waves - EMCrit Project
Nov 1, 2024 · Prominent septal Q-waves (I, aVL, V4-V6, occasionally inferior leads). Basically, Q-waves are present in leads with tall, upright QRS complexes. Vertical heart (e.g., emphysema or tall/thin person): Q-waves may be present in the right or mid-precordial leads when tachycardic. Hyperkalemia: Misleading Q-waves may appear & disappear. Q-wave MI:
Pathogenesis and diagnosis of Q waves on the electrocardiogram
May 9, 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 Q Wave - My EKG
May 19, 2024 · The Q wave is the small initial negative wave of the QRS complex in an electrocardiogram formed during the beginning of ventricular depolarization. Home Basic Principles
Hypertrophic Cardiomyopathy (HCM) • LITFL • ECG Library …
Oct 8, 2024 · HCM showing features of asymmetrical septal hypertrophy: Large precordial voltages. Deep, narrow, septal Q waves most prominent in leads I and aVL; also seen in V5-6. This great ECG is reproduced from Kelly, Mattu and Brady (2007).
Q waves due to positioning of the heart or a change in electrical axis Sometimes a Q (or q) will appear where you least expect it. Such a case includes the “pseudo-septal q wave” of Lead aVL. This is a false septal q wave that appears in Lead aVL …
The QRS complex: ECG features of the Q-wave, R-wave, S-wave …
The ventricular septum is relatively small, which is why V1 displays a small positive wave (r-wave) and V5 displays a small negative wave (q-wave). Thus, it is the same electrical vector that results in an r-wave in V1 and q-wave in V5.
ECG interpretation: Characteristics of the normal ECG (P-wave, …
Normal variants of Q-waves. Septal q-waves are small q-waves frequently seen in the lateral leads (V5, V6, aVL, I). They are due to the normal depolarization of the ventricular septum (see the previous discussion). Two small septal q-waves can actually be …
ECG Cases 14: Q-wave and Occlusion MI - Emergency Medicine …
Oct 13, 2020 · So, in the normal ECG, right sided leads have small positive R waves and larger negative S waves, and left sided leads can have tiny negative “septal Q” waves and positive R waves.