![Figure 1. A quantitative analysis of the Poincare plots. We calculated the ratio of the standard deviation of the R-R interval (SDRR) to the standard deviation of the R-R interval spreading perpendicularly along the diagonal line (SD sub [partial differential] RR).](https://asa2.silverchair-cdn.com/asa2/content_public/journal/anesthesiology/89/3/10.1097_00000542-199809000-00016/2/16ff1.png?Expires=1717042525&Signature=HPx7aNQU~AaOQpqV~OXRJ~Y7Y3ZPTZevNqLgS5C71V0f4GSw29KsQZloZ-aajYNrx0nm7-F3N-QaK0RYe77rpDtRfA1~KDpB~sAXbYDzsdUtVzFQRflR04kJ0UZiYOEEMYd9PtfRPQw8JpcPtRAU1kWSXt1uzfWTJj2TnF4~dnKxjrivWQLobbtW3d1Mr9K6xe2fofIkQD46m4QEO5ye0RHKTG-sDo9uW-lKNSZ2Mggr86ff39NhMlFGiDxOw7CKFEQoMF4jjpH4l~coV-sgXnR96aou9iyoVIOtIVMEQlh6urDT4QF0pjDUri1oxyDMS1tphdqW52EI5YfLQFRZdg__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Figure 1. A quantitative analysis of the Poincare plots. We calculated the ratio of the standard deviation of the R-R interval (SDRR) to the standard deviation of the R-R interval spreading perpendicularly along the diagonal line (SD sub [partial differential] RR).
