OPQRST is an mnemonic used by persons performing first aid, or medical providers, in order to facilitate taking a patient's symptoms and history in the event of an acute illness. It is specifically adapted to elicit symptoms of a possible heart attack. Each letter stands for an important line of questioning for the patient assessment. This is usually taken along with vital signs and the SAMPLE history and would usually be recorded by the person delivering the aid, such as in the "Subjective" portion of a SOAP note, for later reference.
"PQRST" (omitting "O") is sometimes used instead.
The term "OPQRST-AAA" adds "aggravating/alleviating factors", "associated symptoms", and "attributions/adaptations".
Read more about OPQRST: Meaning