Symptoms of formaldehyde poisoning
Mild poisoning: obvious irritation of mucous membrane of eyes and upper respiratory tract. The main manifestations are conjunctival congestion, redness and swelling, dyspnea, heavy breathing sound, hoarseness of throat, speech or dry, dark dumb or greasy. The poisoned person can also feel his breathing sound bold. Another specific symptom of mild formaldehyde poisoning is one to two degrees of throat edema.
Moderate poisoning: cough, expectoration, chest distress, dyspnea and dry and wet percussion sound. When chest X-ray is taken, the texture of the lung is substantiated and becomes scattered dots or flake shadow, which is the medical type of bronchopneumonia; the throat edema is increased to the third grade. Blood gas analysis is accompanied by mild to moderate hypoxemia.
Severe poisoning: the condition of the lung and throat worsens, and pulmonary edema and fourth degree laryngeal edema appear. The blood gas analysis is also serious, which is severe hypoxemia.