Si tenemos síntomas debemos hacernos una prueba en nuestro médico o acudir a un centro especialista para ello.While oxygen saturation (SpO2 ) fluctuated at around 95% after intubation, arterial oxygen pressure (PaO2 ) was higher on arterial blood gasoline Assessment. We suspected methemoglobinemia according to the hole involving SpO2 and PaO2 , a