Table 1

Intraoperative variables

VariableSampling timeData source
Peripheral perfusion index*Absolute values every 15th minute and lowest 1 and 5 min averaged values from the induction of anaesthesia through surgeryElectronic anaesthesia chart
Mean arterial pressureAbsolute values every 15th minute and lowest 1 and 5 min averaged values from the induction of anaesthesia through surgeryElectronic anaesthesia chart
Heart rateAbsolute values every 15th minute and lowest 1 and 5 min averaged values from the induction of anaesthesia through surgeryElectronic anaesthesia chart
Arterial saturationAbsolute values every 15th minute from the induction of anaesthesia through surgeryElectronic anaesthesia chart
TemperatureAbsolute values every 15th minute from the induction of anaesthesia through surgeryElectronic anaesthesia chart
Vasoactive medications: ephedrine, phenylephrine, dopamine, dobutamine, epinephrine and norepinephrineCumulative amounts in operating theatreElectronic anaesthesia chart
Anaesthetic methods: epidural anaesthesia, spinal anaesthesia, combined epidural and spinal anaesthesia, sedation, general anaesthesia Electronic anaesthesia chart
Total intravenous anaesthesia or anaesthesia with volatile anaesthetics  
Total fluid administeredCumulative amounts in operating theatreElectronic anaesthesia chart
HaemoglobinAny values measured perioperativelyElectronic patient record
Serum lactateHighest perioperative valueElectronic patient record
Total operation timeMinutesElectronic patient record

  • *Primary exposure variable.