ESM Appendix 1 Data obtained from the routine dataset of the Finnish Intensive Care Consortium (FICC, Tieto Ltd, Helsinki, Finland) -Age -Gender -Reason for admission: operative/non-operative, emergency/non-emergency -Activities of daily life (ADL), coded as 1. Able to work 2. Unable to work, but needs no help 3. Needs some help 4. Needs help to activities of daily life -Diagnosis by International Classification of Diseases 10th edn. -Severity scorings, including values and points of component: Simplified Acute Physiology Score (SAPS) II score Acute Physiology and Chronic Health Evaluation (APACHE) II score Therapeutic Intervention Scoring System (TISS) points -Length of stay (LOS) in ICU -Hospital LOS -ICU discharge status -Hospital discharge status -Treatment restriction ESM Appendix 1 Study data was mainly collected by using the clinical report form (CRF) and clarifications in short form. Original CRF was in Finnish. Study protocol was presented in several meetings of the FICC and detailed instructions were available in the secured Internet site of the study. Prehospital data collected from emergency medical systems (EMS) reports Admission ID Time labels: Date and time of cardiac arrest Cardiopulmonary resuscitation (CPR) started by EMS Return of spontaneous circulation (ROSC) First defibrillation Estimated time of cardiac arrest in minutes Cardiopulmonary resuscitation, baseline. Bystander CPR (yes/no) Cardiac arrest witnessed (yes/no) EMS activated to the scene (yes/no) Initial Rhythm -shockable/non-shockable -ASY, PEA, VF, VT Treatment during CPR -Epinephrine -Amiodarone -Sodium bicarbonate -Atropine -Thrombolysis -Ringer solution/0,9%-NaCl-solution -Colloid-solution (HES, Gelatine) -Other Treatment after ROSC -Trombolysis -Medical support on circulation -Medical treatment for arrhythmias -Need for sedation or analgesia Place of cardiac arrest: -Public place -Home, not public place -First Aid or Emergency room -Long term nursing home -Hospital ward -Intensive Care Unit Estimated aetiology for cardiac arrest: -Cardiac -Drowning -Intoxication -Anoxia -Hypothermia -Trauma -Unknown Daily data concerning previous 24 hours, recorded daily during ICU stay Date, treatment day, admission ID Breathing and circulation -Intubated -Pneumonia -Treatment for arrhythmias -Prevalent rhythm -sinus, atrial fibrillation, other -Treatment for bradycardia -pacing, medical treatment -Treatment for tachycardia -pacing, medical treatment, defibrillation Medical treatment and fluid balance: -Vasopressor (yes/no) -if yes, name of the vasopressor and highest dose (μg/kg/min) -Inotrope (yes/no) -if yes, name of the inotrope and highest dose (μg/kg/min) -Insulin (yes/no) -if yes, name of the insulin and highest dose (IU/hrs) -Intravenous solutions in ml -Diuresis in ml Neurology -GCS estimated during sedation -Pupils reaction to light -Uncontrollable movement -Sedation -Analgesia -Treatment of fever Highest Glasgow Coma Scale (GCS) Best motoric response -No-response, extension to pain, abnormal flexion to pain, withdrawal to pain, localizes pain, obeys commands Data at ICU discharge Baseline data obtained from patient medical history, before cardiac arrest -Coronary artery disease -Hypertension -Chronic heart failure -Diabetes mellitus -Chronic renal failure -Coronary artery bypass surgery (CABG) -Percutaneous coronary intervention (PCI) -Ejection fraction (EF%), if measured -Pacemaker -Cerebral Performance Category (CPC) (1-4) -Overall Performance Category (OPC) (1-4) -Height, cm, measured/estimated -Weight, kg, measured/estimated Data during ICU stay -Pneumothorax -Haemothorax -Aspiration -Reintubation -Clinical heart failure -Sepsis -Severe sepsis -Septic shock -Pneumonia Interventions and treatments during ICU stay, if yes, date and time were collected -Thrombolysis -Coronary angiography -PCI -CABG -Intra-aortic Balloon Pump (IABP) -Extracorporeal Membrane Oxygenation (ECMO) -Renal Replacement Therapy (RRT) -Continuous Renal Replacement Therapy (CRRT) -Enteral nutrition -Parenteral nutrition -Thrombosis prophylaxis -Peptic ulcer prophylaxis -Anticonvulsant medication -Computed Tomography (CT) of brain -Electroencephalography (EEG) -Somatosensory Evoked Potentials (SEP) -Therapeutic Hypothermia (TH) Sedation -Date and time of sedation stop -Time of sedation in days and hours -Need for restart sedation -First extubation, date and time -Patient obeys commands, date and time Therapeutic hypothermia (TH) -Main technique of hypothermia induction and maintenance -intravenous cooling device -surface cooling device -other surface cooling method -ice-cold intravenous fluids -Additional technique of hypothermia induction and maintenance -intravenous cooling device -surface cooling device -other surface cooling method -ice-cold intravenous fluids -Date and time of TH induction -Target temperature, °C -Time to target temperature -Time in target temperature -Rewarming time -Use of neuromuscular blocking agents -Fever treatment using hypothermia treatment methods Time of invasive mechanical ventilation in days and hours Best and worst measured EF% Treatment restriction -if yes, reason for restriction collected Estimated aetiology of cardiac arrest after ICU treatment -Cardiac -Drowning -Intoxication -Anoxia -Hypothermia -Trauma -Blood loss -Neurological -Pulmonary embolism -Unknown Data at discharge -Intubated -Tracheostomy -Need for oxygen support -GCS -Time of death -Autopsy