案例：辛某，男，67岁，患喘证20余年，冬令发作加重，平素微喘而咳。近日因气候寒冷，咳喘加重，动则喘甚，痰多黏稠色白，喉中略有痰鸣，面色青晦，心慌，畏寒，足冷，形萎神疲，舌淡暗，苔薄白而滑，脉沉弱。本病例的证机概要为

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