6个月患儿，发热，咳喘2天住院，半日来喘憋加重，食欲尚好，未吐泻。查体：体温380C,烦躁，口鼻周发青，鼻翼翕动，三凹征(+)，呼吸80次/分，呼气相延长，双肺闻喘鸣音，少量细湿啰音。血常规：白细胞4.6x109/L(4600/mm3),N0.44。胸片示双肺纹理重，伴少量小点片影及肺气肿。下一步治疗应为

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