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In some cases where a patient's condition is considered to be terminal or that that patient will not benefit from being resuscitated, we will have a legal document in place called the DNAR, Do Not Attempt Resuscitation. Patients will have these in a pre-hospital setting, they will also have them in their notes. In cases where a patient goes into a cardiac arrest, as a result of what is listed on the DNAR, it is permissible not to start CPR in those circumstances. If the cause of the arrest is not listed, for example, the patient may be choking, then we still need to carry out life-saving measures on that patient. The DNAR must be signed and dated, and this must be visualized by the practitioner at the time the decision is made not to commence CPR.