Peripheral Perfusion Index in Adult Patients Attending an Ophthalmology Specialty Consultation for the First Time in the Western Part of Mexico

Pulse oximeters measure three parameters through photoplethysmographic signal analysis: oxygen saturation, pulse rate, and perfusion index (PI). The PI is an indirect measure of peripheral perfusion expressed as the percentage of pulsatile signals compared to non-pulsatile signals. The PI can vary when measured on different fingers. A low PI indicates vasoconstriction and therefore low blood flow, while a high PI suggests vasodilation and consequently better blood flow. (He HW, et al. [1,2]). Both the ACC/AHA recommend achieving blood pressures <130/80 mmHg to prevent cerebrovascular events (Vemu, et al. [3]).