284 Restrictive Diseases - El Camino College · Cardiogenic Pulmonary Edema • Noncardiogenic...
Transcript of 284 Restrictive Diseases - El Camino College · Cardiogenic Pulmonary Edema • Noncardiogenic...
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Restrictive Pulmonary Diseases
Causes:•Acute alveolo-capillary sysfunction•Interstitial disease•Pleural disorders•Chest wall disorders•Neuromuscular disease
ResistanceResistance
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Pathophysiology
• Reduced compliance• Leading to an increase in WOB• Increased oxygen utilization causes hypoxemia• Causes stimulation of peripheral chemoreceptors,
causing hyperventilation• Abnormality promotes ventilation/perfusion
mismatch (primary cause of hypoxemia)• Reduced lung volumes, leading to hypercapnea
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Clinical Manifestations
• Decreased lung compliance• Dyspnea• Tachypnea
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Diagnostic Tests
• PFT• Decreased TLC• Decreased VC• Decreased FEV1
• Normal FEV1%
• Normal FEF 25-75%
• Normal RV/TLC
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Diagnostic Tests• ABG’s• Decreased PaO2, secondary to V/Q
mismatch• Decreased PaCO2 due to hyperventilation• Persistent hypocapnea• Compensated respiratory alkalosis• Hypoxemia is observed in chronic cases• Chronic-hypercapnea, compensated
respiratory acidosis with hypoxemia
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Diagnostic Tests• Chest x-ray• Pulmonary edema• Pneumonia• Pleural effusion• Frail chest
• Physical examination• Kyphosis• Scoliosis• Chest Wall Injury• Pneumothorax
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Pulmonary Fibrosis
• Tissue necrosis• Aspiration• Pneumonitis• Pulmonary infection• Noxious gases
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Pulmonary Fibrosis
• Pathophysiology• Caused by repeated insult to the lung• Inflammatory process releases
polymorphonuclear leukocytes into the alveolar walls
• Certain mediators are released, increasing the number of fibroblasts
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Pulmonary Fibrosis
• Pathophysiology• Fibrosis ensues with decreased compliance• Increased work of breathing• V/Q mismatch precipitates hypoxemia and
hypocapnea
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Pulmonary Fibrosis
• Reduced lung volumes (TLC, FRC, RV)– FEV1
– FEV/FVC% may be higher than normal– FEF25-75% normal or high– no scooped out shape on flow volume curve– downslope of the curve above normal– elastic recoil pressure higher than normal– airway resistance normal
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Pulmonary Fibrosis
• Clinical manifestations• Dyspnea on exertion• Bilateral basal rales• Tracheal shift to the fibrotic side• Affects adults in late middle age• Finger clubbing is common• Shallow, rapid breathing
– increases ventilation of the anatomical VD
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Pulmonary Fibrosis• Diagnosis• Decreased TLC, VC, normal FEV1%
• Decreased PaO2, PaCO2• Increased pH, P(A-a)O2• CXR-mediastinal shift toward the fibrotic
side, irregularly elevated diaphragm– patchy shadows near the diaphragm (basal
collapse– late-honeycomb appearance (cysts)
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Pulmonary Fibrosis
• Treatment• No effective therapy• Mostly supportive and symptomatic• Oxygen therapy for hypoxemia• Avoidance of respiratory irritants• Higher pressures will be needed to distend
the lung
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Cardiogenic Pulmonary Edema
• Cardiogenic Pulmonary Edema• Hypervolemia• Left ventricular failure (CHF)• Mitral valve disease• Myocardial infarction• Increased capillary hydrostatic pressure
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Cardiogenic Pulmonary Edema
• Noncardiogenic pulmonary edema– ARDS
• Near Drowning
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Cardiogenic Pulmonary Edema
• Clinical manifestations• Dyspnea• Cough and expectoration of thin, frothy
sputum• Tachycardia• Tachypnea• Rales • Cyanosis
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Cardiogenic Pulmonary Edema
• Diagnosis• Rales• ABG’s-hypoxemia, hypocapnea and mild
alkalosis• CXR-possible cardiomegaly, increased
opacity and prominent vascular markings• Increased capillary wedge pressure
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Cardiogenic Pulmonary Edema
• Treatment• IPPB with antifoaming agent• Diuretics• Digitalis• MS• High oxygen concentration• Mechanical ventilation with PEEP
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Pneumonia• Bacterial (gm+)
– Pneumococcal– Staphylococcal– Streptococcal
• (gm-)– Klebsiella– Legionella– Pseudomonas
• Viral– influenza– adeno virus
• Aspiration
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Pneumonia
• Pathophysiology• Clinical Manifiestations• Bacterial
– increased body temp– productive cough– thick sputum– hypoxemia, SOB– Increased opacity– Increased WBC’s
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Pneumonia• Viral
– low grade fever– normal WBC’s– frequently undiagnosed
• Diagnosis– body temperature– WBC– Sputum culture – CXR
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Pneumonia
• Treatment– Bronchial hygiene
• IPPB or IS• Aerosol therapy• CPT
– Oxygen therapy– ATB– Fluid therapy
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Pleural Effusion• Transudates
– plasma filtering from blood vessels– severe heart failure
• Right heart failure
• Extudates– inflammatory effusion-containing protein– typically with malignancies and infections
• Pulmonary thrombosis• Pneumonias leading to empyema
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Pleural Effusion
• Clinical– Dyspnea– Chest pain– Fever– Hemoptysis– dry, NPC– Mediastinal shift to the unaffected area– Reduced BS
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Pleural Effusion
• Diagnosis– Thoracentesis– CXR
• Treatment– Chest tube drainage– ATB– Pulmonary hygiene
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Chest Trauma
• Frail Chest– paradoxical respiration– pain
• Treatment– oxygen– pain meds– close monitoring of respiratory failure– mechanical ventilatory support
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Chest Trauma
• Pneumothorax– spontaneous
• most common• caused by a rupture of a small bleb on the
surface of the lung near the apex• tall young males• related to high mechanical stresses
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Chest TraumaSpontaneous Pneumonthorax
• Sudden pain on one side• dyspnea• reduced BS on affected side• must confirm with CXR
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Chest Trauma
• Tension Pneumothorax– small number of cases
• check value between the lung and the pleural space
– medical emergency– increased respiratory distress– tachycardia– signs of mediastinal shift
• tracheal deviation
– needs a chest tube with an underwater seal
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Chest Trauma
• Pneumothorax
– Reduced FEV1 and FVC
– CXR more helpful than a PFT
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ARDS• Also known as Acute Respiratory Failure
– trauma to the lung or rest of the body– aspiration– sepsis
– stiff lungs– decreased lung compliance– decreased FRC
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Neuromuscular Diseases
• Poliomyelitis• Guillian-Barre syndrome• Myasthenia gravis• Botulism• Tetanus
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Neuromuscular Diseases
• All could lead to dyspnea or respiratory failure – reduced FVC, TLC, IC and FEV1
– process of the disease must be monitored by FVC and ABG’s