Preoperative Check and Usage Precautions of Anesthesia Machine

The anesthesia machine is a semi-open anesthesia device that delivers anesthetic gases to the patient's lungs through a mechanical circuit, forming a pressure of anesthetic gas, which diffuses into the bloodstream and directly inhibits the central nervous system, producing the effect of general anesthesia. The anesthesia machine should follow pre-use inspection procedures.

An anesthesia machine is a critical tool used in surgical operations to provide a patient with general anesthesia. The machine works by delivering a precise mixture of anesthetic gases and oxygen at a controlled rate to the patient. The anesthesia machine is typically mounted on a general anesthesia trolley, allowing for easy mobility and aiding in quickly responding during emergencies. It is essential that healthcare professionals properly maintain and calibrate the machine according to manufacturer guidelines to ensure the safe delivery of anesthesia to patients. Additionally, the general anesthesia trolley can be equipped with various accessories, including monitoring devices, respiratory equipment, and suction systems, as necessary.

Pre-use Inspection of Anesthesia Machine

  • Confirm that the standby emergency ventilator functions properly (in case of serious malfunction of the anesthesia machine).

  • Confirm that the central oxygen supply system terminal is connected to the anesthesia machine's reinforced hose correctly and has adequate output pressure.

  • Turn on the anesthesia machine's electrical switch equipment, and confirm that it is in normal status.

  • Check the flow control system, adjust the gas flow rate to the maximum indicated flow rate, and confirm that the float moves normally before shutting it off.

  • Check the level of the evaporator's filling water.

  • Check the low-pressure system of the anesthesia machine.

  • Check the anesthesia circuit, confirm that the circuit components are correctly connected, that the breathing valve and threaded pipe have no water accumulation or damage, that the CO2 absorber is filled and fresh, and that a humidifier can be installed if necessary.

  • Check the positive pressure leakage of the anesthesia circuit, close the gas flow, close the anesthesia circuit exhaust valve, select the ventilation switch to the manual mode, block the patient end of the respiratory threaded pipe Y-joint, and quickly oxygenate the circuit to achieve an internal pressure of 30cmH2O, confirming that the pressure remains stable for at least 10 seconds, open the exhaust valve, and confirm that the pressure drops to 0.

  • Check the anesthesia waste gas removal system for proper connection and unobstructed flow.

  • Anesthesia machine's mechanical ventilation experiment, connect the simulated lungs on the patient end of the anesthesia circuit, set the ventilation parameters, turn on the mechanical ventilation device, confirm that the tidal volume of the inspiratory period of the simulated lungs matches the ventilation settings, the expiratory period of the bellows can be fully charged, and the breathing valve opens or closes normally.

Precautions for the Use of Anesthesia Machines

  • When connecting the anesthesia machine to the patient, adjust the parameters to avoid damaging the patient's lungs by excessive tidal volume or pressure.

  • During the operation of the anesthesia machine, the anesthetist must not leave the machine unattended and should monitor the operational status of the anesthesia machine at all times, including respiratory waveforms, end-tidal carbon dioxide waveforms, bellows movement, and the color of the absorbent calcium lime.

  • During the operation of the anesthesia machine, the anesthetist should be alert to various alarms. When an alarm is sounded, the anesthetist should first determine if the patient is in danger, then investigate the cause of the alarm. Sometimes, damage or aging of certain components (such as oxygen battery aging) may cause low-level alarms, but the anesthesia machine can still operate. In such cases, repair should be carried out promptly to avoid confusing actual life-threatening alarms.

  • When an anesthetist encounters an anesthesia machine he or she has never used before, he or she should familiarize himself or herself with the machine or use it under the guidance of another person, and should not use it rashly.

  • At the end of the anesthesia, the evaporator and gas should be turned off immediately. If there is a follow-up surgery, the anesthesia machine should be in standby mode. The threaded pipe, mask, and gas sampling tube should be stored properly and not stacked to avoid being accidentally stepped on, pulled, or damaged, including the threaded pipe, mask, sampling tube, and even the anesthesia machine. If there is no follow-up surgery, the anesthesia machine should be turned off and the threaded pipe and other accessories discarded or disinfected.

  • After the anesthesia machine is used, it should be cleaned and stored promptly. During cleaning, the machine should be turned off to avoid the risk of electric shock. If the anesthesia machine is not used for a long time, it should also be turned off.

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