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咳嗽是一种保护性的反射动作,它可以将呼吸道内滞积的痰液及细菌、病毒等病原微生物排出体外,使呼吸道保持清洁、通畅。从这一方面来说,咳嗽对人体是有益的。但是,如果当孩子一咳嗽就急于用止咳药,由于药物作用于咳嗽中枢、呼吸道感受器,抑制了咳嗽这一保护性反射性动作,因而痰液就不能及时被排出体外。这时,含有大量病原微生物的痰液就会较长时间滞留在支气管内,一方面阻塞了通道,使病人感到气急、呼吸困难;另一方面,病原微生物在支气管内继续繁殖,出现中毒症状,从而加重病情。这
Cough is a protective reflex action, it can lag the respiratory tract of sputum and bacteria, viruses and other pathogenic microorganisms excreted, so that the respiratory tract to keep clean and smooth. In this respect, coughing is good for the human body. However, if the child is in a hurry to cough with a cough medicine, due to drugs acting on the cough center, respiratory receptors, inhibition of cough, a protective reflex action, so the sputum can not be promptly excreted. At this time, the sputum containing a large number of pathogenic microorganisms will stay in the bronchi for a long time, on the one hand blocking the channel, so that patients feel shortness of breath, difficulty breathing; the other hand, the pathogenic microorganisms continue to multiply in the bronchial, toxic symptoms, Thus aggravating the condition. This