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Table 4 Time-dependent correlations between oxygen reserve index (ORi) with peripheral oxygen saturation (SpO2), perfusion index (PI) and pleth variability index (PVI) during surgery

From: The use of oxygen reserve index in one-lung ventilation and its impact on peripheral oxygen saturation, perfusion index and, pleth variability index

Time (min)

Peripheral Oxygen Saturation (SpO2)

Perfusion Index (PI)

Pleth Variability Index (PVI)

r

p

r

P

r

p

Preoxygenation

0.121

0.404

0.042

0.774

0.017

0.908

DS5

0.286

0.044*

−0.332

0.019*

0.073

0.617

DL5

0.293

0.039*

−0.010

0.947

0.089

0.540

OLV1

−0.030

0.834

0.020

0.888

−0.013

0.984

OLV2

−0.087

0.548

0.158

0.272

−0.147

0.307

OLV5

−0.249

0.081

0.133

0.358

−0.001

0.997

OLV10

0.360

0.011*

−0.240

0.097

−0.058

0.692

OLV15

0.241

0.099

−0,247

0.091

−0.175

0.234

OLV30

−0.162

0.313

0.305

0.053

−0.189

0.237

OLV45

0.270

0.129

−0.115

0.529

0.038

0.837

OLV60

0.092

0.630

−0.179

0.344

−0.036

0.850

OLV90

−0,412

0.113

0.433

0.094

−0.167

0.535

  1. *A p-value of less than 0.05 is considered statistically significant.
  2. ORi Oxygen reserve index, SpO2 Peripheral oxygen saturation, PI Perfusion index, PVI Pleth variability index, DLV Double-lung ventilation, OLV One-lung ventilation, DS5 Under mechanical ventilation 5 min after intubation in supine position, DL5 Under mechanical ventilation 5 min after positioning in the lateral decubitus position, OLV1 After 1 min of OLV, OLV2 After 2 min of OLV, OLV5 After 5 min of OLV, OLV10 After 10 min of OLV, OLV15 After 15 min of OLV, OLV30 After 30 min of OLV, OLV45 After 45 min of OLV, OLV60 After 60 min of OLV, OLV90 after 90 min of OLV