Injured regions of the heart may become electrically inactive. Myocardial infarction is the most frequent cause of this. The normal excitation wave may be altered by this nonfunctioning part of the heart, thus changing the appearance of the QRS complex. In this situation, the early part of the QRS complex appears as a deep, wide negative Q- or QS-wave in certain leads. Smaller areas of injury cause lesser Q-waves.
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Notes
- 1.
11-2-6 code from past editions is now removed and the previous 1-2-8 is now 1-3-8, but the same codes have been used for all other codes in previous editions.
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(2010). Q-QS Waves (1-Codes). In: The Minnesota Code Manual of Electrocardiographic Findings. Springer, London. https://doi.org/10.1007/978-1-84882-778-3_4
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