14.3 Respiratory Pathologies & Disorders

Respiratory Pathologies & Disorders

Core Concept: Respiratory pathologies impair ventilation, gas diffusion, or pulmonary perfusion, compromising cellular oxygen delivery and systemic metabolic homeostasis. In complementary therapy and clinical bodywork, distinguishing between chronic obstructive adaptations, acute communicable infections, and life-threatening thoracic emergencies is paramount for client safety, determining whether treatment is safe with positioning adaptations or strictly contraindicated.

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1. Classification of Respiratory Disorders

Pulmonary diseases are classified broadly by their underlying pathophysiological mechanics into three major categories:

1. Obstructive Pulmonary Diseases: Characterized by an increased resistance to airflow, particularly during expiration, resulting from airway narrowing, intraluminal obstruction, or loss of pulmonary elastic recoil. Common examples include asthma, chronic bronchitis, and emphysema.
   • Diagnostic Hallmark: Marked reduction in the Forced Expiratory Volume in 1 second ($FEV_1$) and a reduced $FEV_1 / FVC$ ratio (typically $< 0.70$).
2. Infectious & Inflammatory Diseases: Characterized by pathogenic microbial invasion of the mucosal lining or parenchymal tissue, inducing intense vascular exudation, leukocyte infiltration, and tissue consolidation or necrosis. Examples include pneumonia, pulmonary tuberculosis, sinusitis, and rhinitis.
3. Pleural & Traumatic Pathologies: Characterized by disruption, inflammation, or air accumulation within the pleural cavity, compromising negative intrapleural pressure and restricting thoracic expansion. Examples include pleurisy and pneumothorax.

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2. Obstructive Airway Pathologies

1. Asthma

Asthma is a chronic inflammatory disorder of the conducting airways characterized by bronchial hyperresponsiveness and episodic, reversible airway obstruction:

• Pathophysiological Triad:
  1. Bronchospasm: Sudden, spastic contraction of circular smooth muscle encircling bronchi and bronchioles.
  2. Mucosal Edema: Degranulation of mast cells and eosinophils releases inflammatory mediators (histamine, leukotrienes $LTC_4$ and $LTD_4$, and prostaglandins), causing increased microvascular permeability, capillary engorgement, and marked swelling of the submucosal airway wall.
  3. Tenacious Mucus Hypersecretion: Submucosal glands and proliferating goblet cells produce copious amounts of thick, viscid mucus that form obstructing intraluminal plugs.
• Clinical Presentation: Recurrent episodes of paroxysmal expiratory wheezing (a high-pitched whistling musical sound caused by turbulent air forced through narrowed bronchioles), severe dyspnea (shortness of breath), chest tightness, tachypnea, and a persistent cough (often worse at night or early morning). During severe attacks, patients use accessory muscles of inspiration and exhibit flaring of the nostrils.
• Triggers:
  • Extrinsic (Allergic / Atopic): IgE-mediated Type I hypersensitivity triggered by inhaled allergens such as pollen, house dust mites, pet dander, or mold spores.
  • Intrinsic (Non-Allergic): Inhalation of cold dry air, vigorous physical exercise (exercise-induced bronchoconstriction), respiratory viral infections (rhinovirus), emotional stress, cigarette smoke, or chemical vapors.
• Clinical Safety & Emergency Protocol for Bodywork:
  • Preparation: Ask whether asthma is currently controlled, whether the person has an action plan, and where their prescribed reliever is kept. Defer a non-essential session when the person is actively wheezing, breathless, acutely unwell, or lacks access to medication they have been told to carry.
  • Clinic Environment: Strictly avoid lighting scented candles, burning incense, or diffusing strong essential oils (such as eucalyptus, peppermint, or citrus) in the clinic, as volatile aromatics frequently trigger acute bronchospasm.
  • Acute Attack Management: If a client experiences acute asthma during a session:
    1. Halt Treatment: Immediately cease all bodywork.
    2. Positioning: Assist the client into an upright seated or semi-reclined forward-leaning posture. Never force an asthmatic client to lie flat supine, which compresses the thoracic cavity and worsens dyspnea.
    3. Reliever and plan: Help the person use their prescribed reliever according to their asthma action plan or current first-aid guidance, only within your training. A spacer should be used when available for a pressurised metered-dose inhaler.
    4. Calm Breathing: Guide the client through slow, pursed-lip exhalations to reduce panic.
    5. Emergency activation: Call emergency services for severe or worsening breathlessness, difficulty speaking, exhaustion, confusion, cyanosis, collapse, no reliever, or failure to improve as directed by the action plan or first-aid protocol. Follow the call handler's instructions.

2. Chronic Obstructive Pulmonary Disease (COPD)

COPD is a progressive, largely irreversible respiratory disorder characterized by persistent airflow limitation and chronic airway inflammation. It is strongly linked to long-term tobacco smoking (accounting for $>85%$ of cases) and prolonged occupational exposure to coal dust, silica, or biomass fuels. COPD encompasses two classical clinical phenotypes that frequently coexist in varying degrees:

A. Chronic Bronchitis

• Clinical Definition: A clinical diagnosis defined by the presence of a persistent, productive cough yielding sputum on most days for at least 3 consecutive months in at least 2 successive years, in the absence of other specific cardiopulmonary diseases.
• Pathophysiology: Chronic irritation from cigarette smoke induces massive hypertrophy and hyperplasia of mucus-secreting submucosal glands in the trachea and bronchi, alongside goblet cell proliferation in smaller bronchioles. Excessive mucus secretion leads to extensive airway plugging. Simultaneously, chronic inflammation paralyses and destroys ciliated epithelial cells (mucociliary escalator failure), leaving stagnant mucus pools prone to recurrent secondary bacterial infections.
• Clinical Presentation:
  • Patients are typically overweight and exhibit pronounced cyanosis (a dusky blue discoloration of the skin, nailbeds, and mucous membranes resulting from severe arterial hypoxemia and carbon dioxide retention), which can occur in advanced disease.
  • Cor Pulmonale: Chronic alveolar hypoxia triggers widespread pulmonary vasoconstriction. Over time, this leads to permanent pulmonary arterial hypertension, which places massive pressure overload on the right ventricle of the heart. The right ventricle hypertrophies and eventually fails (cor pulmonale), manifested clinically by distended jugular veins (JVD), hepatomegaly, and severe bilateral pitting peripheral edema in the ankles and lower extremities.

B. Pulmonary Emphysema

• Pathological Definition: A pathological diagnosis defined by the permanent, abnormal enlargement of the air spaces distal to the terminal bronchioles, accompanied by the destruction of alveolar walls and capillary beds, without obvious mechanical fibrosis.
• Pathophysiology: Inhaled cigarette smoke attracts neutrophils and alveolar macrophages into pulmonary tissue, stimulating them to release excess proteolytic enzymes (specifically neutrophil elastase). Simultaneously, reactive oxygen species in smoke oxidize and inactivate $\alpha_1$-antitrypsin (the endogenous plasma antiprotease that normally neutralizes elastase). This protease-antiprotease imbalance leads to uninhibited enzymatic breakdown of elastin fibers in alveolar septa.
  • Consequences of Elastin Breakdown:
    1. Massive reduction in total surface area available for gas exchange.
    2. Loss of radial traction: Alveolar elastic recoil normally holds small non-cartilaginous bronchioles open during expiration. Without this elastic tethering, bronchioles collapse dynamically during expiration, trapping air inside the lungs (hyperinflation).
• Clinical Presentation:
  • Marked exertional dyspnea with minimal productive cough.
  • Compensatory breathing: Some patients increase ventilation and use pursed-lip breathing to limit small-airway collapse during expiration.
  • Barrel Chest: Chronic air trapping expands the thoracic cage in all directions, increasing the anteroposterior diameter to match the transverse diameter (a 1:1 ratio instead of normal 1:2) and flattening the muscular diaphragm.
  • Pursed-Lip Breathing: Patients instinctively exhale slowly through tightly pursed lips; this creates positive end-expiratory backpressure within the airway lumen, stenting open floppy bronchioles and preventing airway collapse.
  • Cachectic Habitus: Severe weight loss and muscle wasting due to the immense caloric expenditure required for labored breathing (breathing consumes up to 25% of their total daily caloric intake).

Therapy Practice & Positioning for COPD

• Positioning accommodations: Some clients with COPD become more breathless when flat. Ask what position is comfortable and use a supported semi-reclined or seated position when needed; acute or worsening breathlessness is a reason to stop and seek clinical help, not to continue treatment through symptoms.
• Oxygen safety: Oxygen is a medicine for hypoxaemia, not a routine treatment for breathlessness. Some people with COPD are at risk of carbon-dioxide retention, so trained clinicians use controlled oxygen and monitor the response. NICE specifies an emergency target saturation of 88–92% during an acute COPD exacerbation unless an individual target or blood-gas result directs otherwise. A complementary therapist does not prescribe oxygen, alter prescribed home oxygen, or delay emergency services; give first aid only within current training and follow the emergency operator or clinician.

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3. Infectious Respiratory Diseases

1. Pneumonia

Pneumonia is an acute microbial infection and inflammation of the pulmonary parenchyma (alveoli and bronchioles):

• Etiology: Most commonly caused by bacteria (Streptococcus pneumoniae [pneumococcus], Haemophilus influenzae, Staphylococcus aureus), viruses (influenza, respiratory syncytial virus [RSV], SARS-CoV-2), or atypical organisms (Mycoplasma pneumoniae).
• Pathophysiology: Microorganisms colonize alveoli, eliciting an intense inflammatory response. Capillaries dilate and become hyperpermeable, flooding alveolar air sacs with inflammatory exudate, neutrophils, red blood cells, and fibrin. This transforms spongy, air-filled lung tissue into a solid, consolidated, fluid-filled mass—a pathological process termed consolidation.
• Clinical Signs & Symptoms: High spiking fever, shaking chills (rigors), tachycardia, tachypnea, productive cough yielding mucopurulent or characteristically rust-colored sputum (from degraded extravasated red blood cells), sharp pleuritic chest pain aggravated by inspiration, and coarse crackles (rales) on thoracic auscultation.
• Therapy Practice Status: Absolute systemic contraindication during the acute, febrile infectious phase. Manual therapy increases metabolic workload, risks infectious dissemination, and exacerbates systemic inflammation. Treatment may resume only after full medical clearance, completion of antibiotics, and complete defervescence (resolution of fever).

2. Pulmonary Tuberculosis (TB)

Tuberculosis is a chronic, potentially fatal infectious granulomatous disease caused by the acid-fast bacillus Mycobacterium tuberculosis:

• Transmission & Pathophysiology: Transmitted exclusively through airborne droplet nuclei expelled when a person with active pulmonary TB coughs, sneezes, or speaks. Inhaled bacilli lodge in the alveoli and are engulfed by alveolar macrophages. Due to their waxy, mycolic acid-rich cell walls, the bacteria resist phagolysosomal destruction and multiply intracellularly. The immune system mounts a cell-mediated (Type IV hypersensitivity) response, sequestering the bacilli within nodular lesions termed granulomas (tubercles).
• Caseous Necrosis: The core of the tubercle undergoes hypoxic cell death, transforming into a soft, cheesy, proteinaceous debris termed caseous necrosis. If the lesions calcify and fibrose, they form latent Ghon complexes. If host immunity wanes, the tubercles liquefy, cavitate, and rupture into bronchioles, producing active, highly contagious disease.
• Clinical Signs & Symptoms: A persistent, productive cough lasting more than 3 weeks, hemoptysis (coughing up blood or blood-streaked sputum), drenching night sweats, low-grade afternoon fever, profound fatigue, anorexia, and marked progressive weight loss (historically termed "consumption").
• Therapy Practice Status: Absolute systemic contraindication in active disease. Active pulmonary TB is an aggressive airborne biohazard. Practitioners must not treat clients with active symptoms and must report suspected cases for medical evaluation.

3. Sinusitis & Rhinitis

• Sinusitis: Inflammation of the mucosal lining of one or more paranasal sinuses (most commonly the maxillary or frontal sinuses), resulting from impaired ostial drainage following viral rhinitis or allergic inflammation.
  • Signs: Throbbing facial pain and pressure over the affected sinuses, purulent nasal discharge, nasal obstruction, frontal headache, and pain that sharply intensifies when bending the head forward.
  • Therapy Status: Local contraindication for deep manual pressure over the facial sinuses. Gentle, superficial lymphatic drainage of the neck is permissible if the client is afebrile.
• Rhinitis:
  • Allergic Rhinitis (Hay Fever): Type I IgE-mediated hypersensitivity to airborne allergens. Presents with clear watery rhinorrhea, paroxysmal sneezing, nasal itching, and lacrimation. Not a contraindication to treatment; ensure clinic environment is free from animal dander and pollen.
  • Infectious Rhinitis (The Common Cold / Acute Coryza): Acute viral infection (rhinovirus). Presents with nasal congestion, thick mucus discharge, sore throat, sneezing, malaise, and low-grade fever. Systemic contraindication during the acute, febrile, sneezing stage to prevent pathogen transmission.

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4. Pleural & Traumatic Pathologies

1. Pleurisy (Pleuritis)

Pleurisy is an acute inflammation of the pleural membranes (parietal and visceral pleurae), most commonly secondary to viral respiratory infections, bacterial pneumonia, pulmonary embolism, or systemic autoimmune disorders (such as systemic lupus erythematosus):

• Pathophysiology: Inflammatory irritation depletes normal lubricating pleural fluid, coating the pleural surfaces with rough, sticky fibrinous exudate. During respiratory excursions, the inflamed parietal and visceral membranes grind against each other with considerable friction.
• Cardinal Signs & Symptoms:
  1. Sharp, Stabbing Pleuritic Chest Pain: Exquisitely localized pain that worsens acutely with deep inspiration, coughing, sneezing, or trunk rotation. Patients instinctively adopt rapid, shallow breathing to minimize pleural movement.
  2. Pleural Friction Rub: A distinctive, harsh, grating, or creaking sound (resembling the sound of two pieces of dry leather rubbing together) audible through a stethoscope during both inspiration and expiration as the roughened pleural surfaces grind against each other.
• Therapy Practice Status: Absolute contraindication to all thoracic bodywork, rib cage mobilization, or deep pressure. Any client presenting with acute pleuritic chest pain must be referred immediately for medical evaluation to rule out pulmonary embolism or severe infection.

2. Pneumothorax

Pneumothorax is the presence of free air within the pleural cavity, abolishing the normal subatmospheric intrapleural pressure ($-4\text{ mmHg}$) and causing mechanical lung collapse (atelectasis):

• Etiological Types:
  • Spontaneous Pneumothorax: Occurs without preceding trauma. Primary spontaneous pneumothorax typically occurs in tall, thin young individuals (aged 15–35) due to the spontaneous rupture of subpleural apical blebs. Secondary spontaneous occurs in individuals with underlying lung destruction (e.g., bullous emphysema).
  • Traumatic Pneumothorax: Caused by penetrating thoracic trauma (knife wound, gunshot) or blunt trauma (fractured rib puncturing the visceral pleura).
• Tension Pneumothorax (Critical Medical Emergency): A life-threatening variant where a penetrating or lacerated wound acts as a one-way flap valve. Air enters the pleural space during inspiration but cannot escape during expiration. Intrapleural pressure escalates relentlessly above atmospheric pressure, causing total collapse of the ipsilateral lung. The extreme pressure pushes the mediastinum, heart, and trachea toward the opposite side (mediastinal shift / tracheal deviation), compressing the vena cava and eliminating venous return to the heart. Fatal cardiovascular collapse ensues within minutes without immediate needle decompression.
• Cardinal Red Flags: Sudden-onset sharp, unilateral chest pain, severe progressive dyspnea, extreme tachypnea, tachycardia, hypotension, cyanosis, unilateral absence of breath sounds, and visible tracheal deviation away from the affected side.
• Action: Immediate Medical Emergency (999 / 911 / EMS). Do not move or adjust the client; activate emergency medical services immediately.

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5. Clinical Safety Summary, Practitioner Positioning & Red Flags

Complementary therapists and bodywork practitioners must maintain rigorous vigilance when screening clients with respiratory complaints:

Emergency Red Flags Requiring Immediate EMS (999 / 911)

Practical Positioning Principles

• Avoid Supine & Flat Prone: Never place a client with a history of COPD, moderate-to-severe asthma, or active breathlessness in a flat horizontal position. Horizontal positioning pushes the abdominal contents cephalad against the diaphragm, restricting downward diaphragmatic excursion and exacerbating dyspnea.
• Optimal Positioning: Use a semi-Fowler's position (head of table elevated $30^\circ\text{ to }45^\circ$) with pillows supporting the knees and upper torso, or a supportive seated massage chair.

Clinical trap: Chronic bronchitis is defined clinically by a productive cough for at least 3 months in each of 2 successive years after other causes are excluded. Emphysema is defined pathologically by permanent enlargement of distal air spaces with destruction of alveolar walls. They commonly coexist in COPD, and body habitus or skin colour does not reliably separate them. Do not alter prescribed oxygen; acute or worsening breathlessness needs clinical assessment.