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Cardiopulmonary resuscitation (CPR) is an emergency procedure consisting of chest compressions often combined with artificial ventilation, or mouth to mouth in an effort to manually preserve intact brain function until further measures are taken to restore spontaneous blood circulation and breathing in a person who is in cardiac arrest.
The compression depth and force varies per patient. The chest displacement equals a 20% reduction in the anterior-posterior chest depth. The physiological duty cycle is 50%, and it runs in a 30:2, 15:2 or continuous compression mode, which is user-selectable, at a rate of 80 compressions-per-minute.
Some trainers continue to use circulation as the label for the third step in the process, since performing chest compressions is effectively artificial circulation, and when assessing patients who are breathing, assessing 'circulation' is still important. However, some trainers now use the C to mean Compressions in their basic first aid training.
After defibrillation, chest compressions should be continued for two minutes before another rhythm check. [30] This is based on a compression rate of 100-120 compressions per minute, a compression depth of 5–6 centimeters into the chest, full chest recoil, and a ventilation rate of 10 breath ventilations per minute. [30]
The newest guidelines for adult BLS allow a rescuer to diagnose cardiac arrest if the patient is unresponsive and not breathing normally. The guidelines also changed the duration of rescue breaths and the placement of the hand on the chest when performing chest compressions.
Image credits: Imafish12 #5. ICU RN for 9 years here. We don’t “shock” asystole, aka a “flatline” heart rhythm. We do manual chest compressions and we give them epinephrine (adrenaline ...
Chest compressions were commenced within 10 minutes; The cardiac arrest duration (collapse to arrival at E&TC [ambiguous]) has been < 60 minutes; The patient is aged between 12 and 70 years; There are no major co-morbidities that would preclude return to independent living; The patient is profoundly hypothermic (<32 °C) due to accidental exposure
A study measured the effects of chest compression fraction on return of spontaneous circulation in out-of-hospital cardiac arrest patients with a non-ventricular fibrillation arrhythmia and it showed a trend to achieving return of spontaneous circulation with an increased chest compression fraction. [2]
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