Ultrasound-guided paravertebral nerve block anesthesia on the stress response and hemodynamics among lung cancer patients

Figure 1 Trend diagram of mean arterial pressure, heart rate and partial pressure of oxygen for different time periods. A: Mean arterial pressure; B: Heart rate; C: Partial pressure of oxygen. The time periods are shown on the horizontal axis. T0: Baseline time; T1: 15 min after anesthesia; T2: After induction of intubation; T3: 5 min after skin incision; T4: Before extubation; MAP: Mean arterial pressure; HR: Heart rate; SpO₂: Partial pressure of oxygen.