These 9-codes are reserved for miscellaneous ECG items 9-1 through 9-5 and 9-6 is for p-wave abnormality associated with left atrial hypertrophy, and “error” code 9-8. Code 9-7 is left open for any additional ECG findings of interest to individual investigators.
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(2010). Miscellaneous Codes (9-Codes). In: The Minnesota Code Manual of Electrocardiographic Findings. Springer, London. https://doi.org/10.1007/978-1-84882-778-3_11
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