Classical features of asphyxia include cyanosis (blue discolouration of the skin due to a lack of oxygen), tachycardia (increased heart rate), hypotension (low blood pressure), bradycardia (slow heart rate), and respiratory arrest (cessation of breathing). Asphyxia can also cause confusion, seizures, and coma. In extreme cases, it can result in death. Other neurological effects may include confusion, agitation, restlessness, and even delirium. Treatment of asphyxia depends on the cause and can include oxygen therapy, ventilation, and other supportive measures.