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Relationship between PI and blood flow after SGB, as measured by pulse oximetry and laser-Doppler blood flow meter sensor attached to the earlobes of 2 patients. (A) PI = 0.047 × (blood flow) – 0.968, r2 = 0.89, (B) PI = 0.025 × (blood flow) – 0.0531, r2 = 0.68.
Abbreviations: SGB, stellate ganglion block; PI, perfusion index.
