Aed stands for full#Liaise with emergency services when they arrive and provide full details of the actions undertaken. If the patient shows signs of recovery, place in the recovery position. Check the patient every minute to ensure that signs of a circulation are still present. If circulation returns, check for breathing-Continue to support the patient by rescue breathing if required. Shocks should be repeated as indicated by the machine. Alternatively, this procedure may start automatically, depending on the machine's individual features or settings. This will be timed by the machine, after which it will prompt the operator to reanalyse the rhythm. Give cardiopulmonary resuscitation as required-If no pulse or other sign of a circulation is found after three shocks, perform cardiopulmonary resuscitation for one minute. Most machines have motion sensors that can detect any interference by a rescuer and will advise no contact between shocks. Repeat as directed for up to three shocks-Do not check for a pulse or other signs of a circulation between the three shocks because this will interfere with the machine's analysis of the patient's electrocardiographic trace. AEDs.įollow the voice prompts and visual directions-The electrocardiographic analysis is usually automatic, but some machines require activation by pressing an “analyse” button.Īdminister shock if indicated-Ensure that no one is in contact with the patient and shout “stand clear.” Press the shock button once it is illuminated and the machine indicates it is ready to deliver the shock. Other strategies used to decrease response times include equipping the police and fire services with AEDs. They are able to reach the patient and provide initial treatment, including defibrillation if necessary, before the ambulance arrives. Increasingly, trained lay people (termed first responders) living locally and equipped with an AED are dispatched by ambulance control at the same time as the ambulance. In the United Kingdom, the remoteness of rural communities often prevents the ambulance service from responding quickly enough to a cardiac arrest or to the early stages of acute myocardial infarction. In one report, the cabin crew of American Airlines successfully defibrillated all patients with ventricular fibrillation, and 40% survived to leave hospital. Other locations where trained lay people undertake defibrillation are in aircraft and ships, when a conventional response from the emergency services is impossible. cycle.Ĭontinuous electrocardiogram showing successful treatment of ventricular fibrillation by a countershock (given at the arrow) After the shock has been delivered, the defibrillator will analyse the electrocardiogram again if ventricular fibrillation persists the process is repeated up to a maximum of three times in any one cycle. Some models feature a simple 1-2-3 numerical scheme to indicate the next procedure required, and most illuminate the control that administers the shock. Full instructions are provided by voice prompts and written instructions on a screen. When fully charged, the device indicates to the operator that a shock should be given. Some models also display the heart rhythm on a monitor screen. The process of interpreting the electrocardiogram is automatic, and if the sophisticated electronic algorithm in the device detects ventricular fibrillation (or certain types of ventricular tachycardia) the machine charges itself automatically to a predetermined level. These electrodes serve a dual function: recording the electrocardiogram and giving a shock if indicated. The operator has only to recognise that cardiac arrest may have occurred and attach two adhesive electrodes to the patient's chest. An AED automates many of the stages in performing defibrillation.
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