Which factors are contraindications for terminating resuscitation?

Hypothermia is a critical factor when considering the termination of resuscitation efforts. In cases of hypothermia, the body’s metabolic processes slow down significantly, which can lead to severe bradycardia or even cardiac arrest. However, individuals who are hypothermic can have the potential for recovery even after prolonged periods without a pulse. This is due to the body's ability to withstand lower temperatures, which can protect the brain and heart from damage. As a result, resuscitation should continue in these cases until the patient's temperature is raised and they are reevaluated, as they may have a chance of successful resuscitation that wouldn’t be present in other emergencies.

In contrast, the other factors do not impede the decision to terminate resuscitation. A recent cardiac history could indicate the likelihood of cardiac events, but it does not determine the effectiveness of resuscitation efforts. The presence of a pulse is a clear indicator that resuscitation has succeeded in restoring circulation, while the presence of bystanders is more of a guideline regarding the initiation of CPR rather than a contraindication for terminating efforts.