Don't trust the machine. Manually confirm:
“Lateral infarct, age undetermined” is not a diagnosis—it’s a finding. The ECG is a screening tool; the echocardiogram is the confirmatory test. Match the ECG to the patient’s history, and never treat the machine’s readout as final. lateral infarct age undetermined
Any of those moments could have been the funeral. He had been living with a corpse in his chest, a necrotic patch of silence, for an indeterminate amount of time. He realized then that "age undetermined" was the most terrifying diagnosis of all. It meant that the catastrophe had already arrived, done its work, and left without ever ringing the doorbell. He had survived the event without ever knowing it had occurred, and now he was just living in the aftermath. Don't trust the machine
Isolated Q waves in V5-V6 with normal R waves and no Q in I/aVL are usually septal Q waves (normal). True lateral infarct affects both limb and precordial lateral leads. Match the ECG to the patient’s history, and
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Septal Infarct: Symptoms, Causes & Treatment - Cleveland Clinic