Patient control and observation during anaesthesia includes patient's condition before anaesthesia, during and following anaesthesia. Monitoring during anaesthesia refers to monitoring of the patient's vital signs, observation of anaesthesia machine and ventilator. The monitoring includes as follows: the state of consciousness (before the anaesthesia induction, the depth of anaesthesia and the patient state during recovery following anaesthesia), vital signs such as blood pressure, heart rate and quality of peripheral pulse, electroencephalography (ECG), respiratory rate and volume of breathing, oxygen saturation of peripheral blood, body temperature, diuresis (when indicated). Further, patient monitoring includes the value of carbon dioxide in the expired gas mixture, the level of neuromuscular blockade (if the neuromuscular relaxant is used), as well as monitor of the inspiratory and expiratory concentrations of volatile anesthetics. In special cases, values of the central venous pressure (CVP), cardiac output, blood pressure in the pulmonary artery, doppler echocardiography, the values of intracranial pressure, electroencephalography (EEG), and the amount of blood lost. It is recommended to use non-invasive monitoring but invasive monitoring is possible if needed. Final work will include a plan of health care through the nursing diagnoses, objectives and nursing interventions.