Chapter 29: Alterations of Pulmonary Function

Students learn to recognize primary clinical manifestations including dyspnea, persistent cough, hemoptysis, abnormal sputum production, cyanosis, and digital clubbing, along with characteristic breathing patterns such as Kussmaul and Cheyne-Stokes respirations. The chapter establishes foundational concepts around gas exchange impairment and systemic complications including hypoxemia, hypercapnia, respiratory failure, and cor pulmonale development. Restrictive diseases compromise lung compliance and expansion capacity through mechanisms such as alveolar collapse, pulmonary fibrosis, ARDS progression through inflammatory phases, and occupational inhalation injuries. Obstructive disorders narrow airways and impede expiratory flow, with asthma presenting as an inflammatory condition involving bronchospasm and airway remodeling, while COPD encompasses chronic bronchitis with excessive mucus production and emphysema characterized by alveolar destruction and loss of elastic recoil. The chapter addresses infectious pathology including bacterial and viral pneumonia variants, tuberculosis granuloma formation and latency mechanisms, and lung abscess development following aspiration events. Vascular complications receive thorough treatment, covering pulmonary embolism pathogenesis from venous thrombosis, pulmonary arterial hypertension with endothelial dysfunction and vascular remodeling, and secondary right ventricular dysfunction. Malignancy discussion distinguishes between non-small cell carcinomas including adenocarcinoma and squamous cell types alongside neuroendocrine small cell carcinoma, emphasizing molecular heterogeneity, metastatic patterns, and contemporary treatment approaches including targeted tyrosine kinase inhibition and immune checkpoint modulation. This integrative framework enables students to understand disease mechanisms, predict clinical progression, and recognize therapeutic intervention points across the spectrum of pulmonary alterations.