mended, but the former tends to imped sputum excretion because of coughing effect avoided and the latter tends to help the aggravation because of inadequate humidification to the inhaaated gas. Dehydration accompanied with electrolyte loosing can be factor dominating its prognosis. Out of the aggravation, 63% has urine less than 1, 000 ml per day and 73% has sputum less than 20ml per day, and out of these cases 60% did not survive. Such a dehydration is mostly due to the water loosing brought

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... sweating, malnutrition or insensible perspiration under the abnormal breathing, and it must be treated carefully accompanied with ventilation control. From our clinical experience, administration of bicarbonate ion is the first choice to the patients involved in severe respiratory acidosis.