Circulatory arrest is a state in which the heart stops supplying blood to the body... This can happen suddenly due to electric shock, drowning, multiple trauma, anaphylaxis... or as a result of a medical condition. Chronic diseases such as cancer, cirrhosis, heart failure, kidney failure... Nerve damage is a remarkable problem of resuscitation after circulatory arrest.

Brain death is a term that refers to the complete loss of brain function including the brain stem while the heart is still beating and the limbs are still warm and pink thanks to medical support. The patient falls into a vegetative state when brain death occurs. When a patient is brain dead, the treating physician needs to clearly explain to the family to choose to continue to maintain vegetative life or stop implementing supportive measures such as mechanical ventilation and intravenous fluids to end the vegetative state.

Because ultrasound waves cannot pass through the thick bone of the skull, but in certain windows, ultrasound waves can penetrate. Taking advantage of these windows, people have used transcranial Doppler ultrasound with low frequency probe, 2 MHz ultrasound probe to examine the cerebral vascular system.

When it comes to encephalopathy, the main treatment is to find the cause and deal with it properly. Participating in rehabilitation can also help improve the patient's condition.