Thoracic epidural or paravertebral analgesia after thoracic surgery

INTERVENTION: Continuous thoracic epidural catheter or continuous paravertebral catheter for pain treatment CONDITION: Thoracic surgery ; Surgery PRIMARY OUTCOME: FV1 measured in L/sec and PEF measured in L/sec‐ lung function parameters from spirometry (FeV1=expiratory flow after 1 second, PEF=peak expiratory flow, FVC=forced vital capacity). ; ; The outcome parameters will be measured before the TEA or PVB placement, 15 minutes afterwards and twice daily until day 3 after surgery. SECONDARY OUTCOME: 1. Pain levels at rest and with coughing (using the verbal numeric rating scale at rest and during coughing) ; 2. Aggregated incidence of nausea, vomiting, pneumonia, atelectases; 3. Mobilisation (time to stand up, to walk); ; The outcome parameters will be measured before the TEA or PVB placement, 15 minutes afterwards and twice daily until day 3 after surgery. INCLUSION CRITERIA: 1. Aged 18 years old and above 2. American Society of Anesthesiologists (ASA) grade I‐III 3. Planned thoracic surgery 4. Accepted procedure