The abbreviation AI carries at least three unrelated meanings in medicine, and which one applies depends entirely on where you are reading it.

In a cardiology note, an echocardiogram report, or a physical examination finding, AI means aortic insufficiency ... regurgitant flow back through the aortic valve, also written as AR for aortic regurgitation. This is by far the most common clinical use, and it long predates the technology sense.

In a health IT context, a vendor discussion, a research paper, or a regulatory filing, AI means artificial intelligence. In nutrition and dietetics literature, AI means Adequate Intake, a reference value used when there is not enough evidence to set a Recommended Dietary Allowance. Less commonly it appears for accidental injury, aromatase inhibitor, or artificial insemination, all of which are usually spelled out to avoid exactly this problem.

Where This Gets Misread

The ambiguity is not academic. Clinical documentation software that expands abbreviations, and increasingly large language models summarizing charts, have to resolve which AI a note meant. A summarizer that reads "moderate AI" in an echo report and expands it to artificial intelligence has made an error no clinician would make, and it will look completely fluent doing it.