PINRs = pupilas isocóricas y normorreactivas. This is not the English acronym PINRS, which (rightly) refers to a pain rating scale, as proposed in the other answers.

The most common English equivalence would be PERRLA (see e.g. https://www.proz.com/kudoz/english-to-spanish/medical-genera... however, PERRLA is a hyponym in relation to PINR, as it includes additional aspects of the examination (the shape of the pupils and their reactivity to both light and accomodation). I would not use an acronym in this case.

The report is following the usual head-to-toe order of a physical exam: PINRs (pupils), RsCsRs (heart sounds), CsPs (lung sounds), abdomen. A pain scale would not be the first item in a history and physical; it would be grouped with the vital signs.