COPD Eric J Milie, D.O. Goals and Objectives Compare and contrast chronic bronchitis and emphysema with regards to physical exam, pathogenesis, and clinical history Discuss treatment options for outpatient management of COPD Construct a plan for in hospital management of a COPD exacerbation Introduction Estimated to effect 32 million people in the U.S. Fourth leading cause of death in U.S. Classic symptoms of chronic bronchitis and/or emphysema Triad now recognized as including asthma Background Early 19th century Western Europe: Badham and Laennec made the classic descriptions of chronic bronchitis and emphysems British medical textbook in 1860 described chronic bronchitis as an advanced lung disease with recurrent infections that ended in right heart failure Background continued Caused greater than 5% of all death in the middle ages More common among poor, attributed to “bad living” 1958: Ciba symposium- proposed definitions for both chronic bronchitis and emphysema, encorporating spirometry and air flow obstruction Definition Disease state characterized by the presence of airflow obstruction Airflow obstruction progressive Accompanied by airway hyper-reactivity, May be partially reversible Pathophysiology Combination of 3 disease entities: 1. Chronic Bronchitis 2. Emphysema 3. To a lesser extent, asthma Pathophysiology continued Increased number of polymorphonuclear leukocytes and macrophages, which leads to lung destruction Oxygen free radicals from cigarette smoke further damage lung tissue Human leukocyte esterase primary offender among inflammatory cytokines Chronic Bronchitis Defined clinically as the presence of a productive cough for three consecutive months for two consecutive years Characterized by excessive mucus production with airway obstruction and notable hyperplasia of mucus producing glands Chronic Bronchitis Damage to epithelium impairs response to bacteria Inflammation and mucus provide obstruction Body responds by decreasing ventilation and increasing cardiac output Hypercapnea and respiratory acidosis develop with time Lead to cor pulmonale and “blue bloater” appearance Chronic Bronchitis: Schematic Chronic Bronchitis: Bronchoscopy Cor Pulmonale: EKG Blue Bloater Emphysema: Three Subtypes Centriacinar: focal destruction limited to respiratory bronchioles. Associated with cigarette smoking Panacinar: Involves entire alveolus, worst in lower lung zones. Associated with alpha 1antitrypsin deficiency Distal Acinar: Limited to fibrous septa, forms bullae Emphysema Gradual destruction of alveola and pulmonary capillary bed Results in decreased ability to keep blood oxygenated Body compensated with decreased cardiac output and hyperventilation Body tissue suffers from low cardiac output, develop pulmonary cachexia “Pink puffers” Emphysema: Schematic Pink Puffer Emphysematous Lung Centriacinar Emphysema Emphysema: Apical Bullae COPD: Frequency In the U.S., between 14.2 million diagnosed with COPD (estimated 32 million with disease) 12.5 million diagnosed with Chronic Bronchitis 1.7 with Emphysema Since 1982, number of U.S. citizens diagnosed with COPD increased by 41.5% Frequency continued Researchers estimate prevalence of 8-17% of men and 10-19% of women Global initiative for Obstructive Lung Disease (GOLD) estimates international prevalence between 9-10% of adults over the age of 40 COPD: Morbidity and Mortality Absolute mortality rates for U.S.patients between the ages of 55 and 80 were 200 per 100,000 males and 80 per 100,000 females Mortality rate in women expected to increase due to increased number of women smokers Between 1979 and 1998, death rates increased by 9% in men, 159% in women COPD: Cost In 2004, cost to the nation in health care dollars for COPD was approximately 37.2 billion dollars 20.9 billion in direct health care cost 7.4 billion in indirect morbidity cost 8.9 billion in indirect mortality cost Risk Factors: Smoking Smoking is primary risk factor: 80-90% of all COPD deaths are related to smoking Female smokers 13 times more likely to die of COPD than non-smokers Male smokers 12 times more likely to die than nonsmokers Risk Factors: Other Air pollution Second hand smoke History of childhood respiratory infections Heredity Atopic patients Alpha-1-antitrypsin deficiency Occupational exposures (involved in 19% of COPD cases, 31% of nonsmokers) History Most present with combination of signs of chronic bronchitis, emphysema, asthma Worsening dyspnea Progressive exercise intolerance Altered mental status History: Chronic Bronchitis Productive cough, with progression to intermittent dyspnea Frequent, recurrent pulmonary infections Progressive cardiac/respiratory failure over time Edema Weight gain History: Emphysema Long history of progressive dyspnea Late onset of nonproductive cough Occasional mucopurulent relapses Cachexia Overt respiratory failure Physical Exam: Chronic Bronchitis Obese patient Productive cough Coarse breath sounds Accessory muscle usage Signs of right heart failure Physical Exam: Emphysema Thin with barrel chest Little cough Pursed lip breathing Hyperresonant chest, distant heart sounds Wheezing Clubbing of Digits Pursed Lip Breathing Nicotine Staining Cyanotic Nails Barrel Chest Lab Studies: ABG ABG provides clues as to acuity and severity Renal compensation almost always present, usually with near-normal pH pH below 7.3 sign of acute respiratory compromise Lab Studies: Serum Chemistries Tend to be sodium retainers Tend to have low potassium: diuretics, theophylline, and beta-agonists all lower serum K Beta-agonists also enhance renal excretion of magnesium and calcium CBC may show polycythemia secondary to cigarette smoking Imaging Studies Chronic bronchitis: increased vascular markings, cardiomegaly Emphysema: hyperinflation, flat diaphragm, small heart, possible bullous changes Chronic Bronchitis: CXR Emphysema: CXR Emphysema: CXR and CT Other Tests: Pulse Oximetry Not as accurate as ABG No info on CO2 May precipitate iatrogenic CO2 narcosis if used inappropriately Other Tests: EKG Underlying cardiac disease likely Need to determine if hypoxia causing ischemia Rule out cardiac as cause of shortness of breath PFT’s Decreased FEV1 with concomitant reduction in FEV1/FVC ratio Poor or absent reversibility with bronchodilators FVC normal or reduced TLC normal or increased Increased RV Normal or reduced defusing capacity Normal Obstructive GOLD Criteria FEV1/FVC <70% FEV1 <80% post-bronchodilator Severity Based on Spirometry Moderate: FEV1 <80% predicted Severe: FEV1 <50% predicted Very Severe: FEV1 <30% of predicted Treatment: Improving Survival Time Smoking cessation Oxygen therapy Lung Volume Reduction Surgery Noninvasive mechanical ventilation in acute exacerbation Treatment: Symptom Improvement Pharmacotherapy Pulmonary Rehab Surgery Smoking Cessation Most important component of COPD therapy in smokers Smoking cessation programs should involve multiple interventions Smoking cessation materials available at http://www.surgeongeneral.gov/tobacco/defa ult.htm Pharmacotherapy: Bronchodilators Alleviate symptoms of COPD Improve exercise tolerance Decrease number and severity of exacerbations Decrease lung hyperinflation in response to increased respiratory demand Elderly patients: difficulty with MDI Proper Usage of MDI Step 1: Shake inhaler and remove the cap as instructed Step 2: Hold the inhaler upright with the mouthpiece at the bottom Step 3: Tilt head back slightly, breathe out slowly and completely Step 4: Place the inhaler 2.5 cm (1 in.) to 5 cm (2 in.) in front of your open mouth, without closing your lips over it Place the inhaler in your mouth. This method is easier for most people and reduces the risk that any of the medication will get into your eyes. Step 5: Start breathing in slowly, evenly, and deeply, and press down on the inhaler one time (inhale and press). Step 6: Hold your breath for 10 seconds. This will let the medication settle in your lungs Beta Agonists Increase cyclic adenosine monophosphate levels Promote smooth muscle relaxation in the bronchioles Available in short and long acting preparations Side effects include tachyarrhythmias and hypokalemia Short Acting Beta Agonists Work quickly to relieve shortness of breath (15-20 minutes) “Rescue agents” Albuterol (Proventil® and Ventolin®) and Metsproterenol (Alupent®) commonly used Levalbuterol (Xopenex®) newer preparation, less side effects of tachycardia Long Acting Beta Agonists No immediate effect, last longer (12 hours) Not to be used as rescue agent Use on twice daily basis Salmeterol (Serevent®) and Formeterol (Foradil®) commonly used Anticholnergics Effect muscarinic receptors Slower onset of action but longer acting than Albuterol Ipratroprium (Atrovent®) used up to four times daily Tiotroprium (Spiriva®) revolutionizing COPD treatment; once daily administration with increased functional capacity and less exacerbations Spiriva® Theophylline Increases cyclic adenosine monophosphate levels Induces smooth muscle relaxation Improves respiratory drive, diaphragmatic motion, and increases exercise tolerance Limited by side effects: tachyarrhythmias, seizures, nausea, vomiting Corticosteroids Consider in patients who don’t improve on bronchodilators Several clinical trials failed to show benefit in mild to moderate COPD Large metanalysis showed decreased symptoms, improved functional capacity in patients with severe COPD May be inhaled or systemic Other Anti-Inflammatory Agents Cromolyn (Intal®) and Nedocromil (Tilade®), despite role in asthma, not indicated in COPD Leukotriene inhibitors (Singulair®) data not promising with regards to COPD Antibiotics 2/3 of COPD exacerbations infectious, 80% bacterial Accepted utility of antibiotics in the face of COPD exacerbation Outpatient treatment with Bactrim or Doxyxyxline Inpatient treatment more involved Most Common Infectious Causes of COPD Exacerbations Mild to moderate exacerbations Streptococcus pneumoniae Haemophilus influenzae Moraxella catarrhalis Chlamydia pneumoniae Mycoplasma pneumoniae Viruses Severe exacerbations Pseudomonas species Other gram-negative enteric bacilli Antibiotics Commonly Used in Patients with COPD Exacerbations Mild to moderate exacerbations* Moderate to severe exacerbationsÝ First-line antibiotics Doxycycline (Vibramycin), 100 mg twice daily Trimethoprim-sulfamethoxazole (Bactrim DS, Septra DS), one tablet twice daily Amoxicillin-clavulanate potassium(Augmentin), one 500 mg/125 mg tablet three times daily or one 875 mg/125 mg tablet twice daily Macrolides Clarithromycin (Biaxin), 500 mg twice daily Azithromycin (Zithromax), 500 mg initially, then 250 mg daily Fluoroquinolones Levofloxacin (Levaquin), 500 mg daily Gatifloxacin (Tequin), 400 mg daily Moxifloxacin (Avelox), 400 mg daily Cephalosporins Ceftriaxone (Rocephin), 1 to 2 g IV daily Cefotaxime (Claforan), 1 g IV every 8 to 12 hours Ceftazidime (Fortaz), 1 to 2 g IV every 8 to 12 hours Antipseudomonal penicillins Piperacillin-tazobactam(Zosyn), 3.375 g IV every 6 hours Ticarcillin-clavulanate potassium (Timentin), 3.1 g IV every 4 to 6 hours Fluoroquinolones Levofloxacin, 500 mg IV daily Gatifloxacin, 400 mg IV daily Aminoglycoside Tobramycin (Tobrex), 1 mg per kg IV every 8 to 12 hours, or 5 mg per kg IV daily Stepwise Approach to Management STEP 1 For mild, variable symptoms Selective beta2-agonist MDI aerosol, 1-2 puffs q2-6h prn (not to exceed 8-12 puffs/24 hr) STEP 2 For mild to moderate, continuing symptoms Long-acting beta2-agonist MDI aerosol, 1 puff bid OR Long-acting anticholinergic, 1 capsule qd OR Ipratropium bromide (Atrovent) MDI aerosol, 2-6 puffs q6-8h (not to be used more frequently) PLUS Selective beta2-agonist MDI aerosol, 1-4 puffs prn qid (for rapid relief, when needed or as regular supplement) Alternative: Combine a long-acting beta2-agonist MDI aerosol, 1 puff bid, and a long-acting anticholinergic, 1 capsule qd Continued STEP 3 If response to step 2 is unsatisfactory or for a mild to moderate increase in symptoms Add a timed-release formulation of theophylline, 200-400 mg bid OR 400-800 mg hs for nocturnal bronchospasm STEP 4 If control of symptoms is suboptimal or patient has frequent exacerbations Consider adding inhaled corticosteroids STEP 5 For severe exacerbations Increase beta2-agonist dose (eg, MDI with spacer, 4-6 puffs q1/2-2h; inhalant solution, unit dose q1/2-2h) Increase ipratropium dose (eg, MDI with spacer, 6-8 puffs q3-4h, or inhalant solution of ipratropium, 0.5 mg q4-8h) AND Provide methylprednisolone sodium succinate (A-Methapred, SoluMedrol) dose IV, giving 50-100 mg stat, then 40 mg q6-8h; taper as soon as possible (treat for <2 wk) AND Occasionally, consider giving theophylline dose IV with calculated amount to bring serum level to 8-12 micrograms/mL Add an antibiotic, if indicated Oxygen Therapy Aside from smoking cessation, only intervention shown to prolong life 1970: Barach and Petty recognized value of long term oxygen in patients with severe COPD Nocturnal Oxygen Therapy Trial and Medical Research Council studies demonstrate long term oxygen therapy extends life in hypoxemic COPD patients and that survival benefit related to number of hours on oxygen daily Oxygen Therapy Continued Medical necessity must be completed Indications are PaO2<55mmHg or SPO2<88% No survival benefit with PaO2<55mmHG Delivery via nasal canula or CPAP (if hypercapnic) Oxygen-Hemoglobin Dissociation Curve CPAP: Whole Face Mask CPAP: Nasal Pillows CPAP: Chin Strap Pulmonary Rehab American Thoracic Society: “a multidisciplinary program of care for patients with chronic respiratory impairment that is individually tailored and designed to optimize physical and social performance and autonomy” Controlled studies have shown significant improvement in areas of exercise tolerance, quality of life, decreased dyspnea, and fewer hospitalizations Surgery Surgical options last resort Lung volume reduction and lung transplant Clinical trials showed increase in FEV1 of 45% and decrease in residual volume by 25% at one year One year mortality >10% Pictured: the usual sites of the small incisions used to accomplish the thoracoscopic approach to lung volume reduction surgery. Diseased lung tissue is removed to restore lung elasticity and improve the function of the diaphragm muscle. Acute Exacerbations Pharmacologic therapy initiated with same agents used for day to day management Rule out other sources of SOB (MI, CHF, Pneumonia, PE) Anticholinergics and beta agonists administered with greater frequency via nebulized route AECOPD contnued Systemic corticosteroids should be added via intravenous or intramuscular route Appropriate antibiotic selection Noninvasive mechanical ventilation (BiPAP or CPAP) in patients who are hypercapnic, not septic, and can participate in their own care reduces ICU stays, hospital length, and intubation rates Intubation if indicated Question 1 A fifty five year old white female presents to your office with a chief complaint of shortness of breath, getting progressively worse over the past few months. On further questioning, she admits to a productive cough for the last few months, and notes a similar history over the past three or four years. She smokes 2 packs of cigarettes daily. An ABG shows a PAO2 of 60%, with a pulse oximetry reading of 90% on room air. Question 1 continued Which of the following interventions will prolong this patient’s life? A. Beginning the patient on short acting betaagonist albuterol B. Low flow oxygen via nasal canula C. Smoking cessation D. Introduction of theophylline E. Tapered dose of prednisone Question 2 The same patient comes back t the office for a follow up visit four months later. She continues to smoke. She’s complaining of a cough today, productive for green sputum, as well as fevers and chills. Her x-ray is shown… Question 2 continued Which of the following antibiotic choices would be appropriate in this patient? A. Metronidazole 250mg PO TID for 14 days B. Keflex 500mg PO QID for 10 days C. Pen VK 250mg PO QID for 10 days D. Trimethoprim/Sulfamethoxazole one tablet POtwice daily for 10 days E. Ciprofloxacin 250mg PO Bid for 10 days Question 3 Your patient responds well to the antibiotic and improves clinically. Six months later, she arrives in the emergency department short of breath. She’s been off of her medicatins. She continues to smoke. On exam, she’s tachycardic with a blood pressure of 100/56. Wheezes are noted bilaterally. The following tests are procured in the emergency department… Question 3 continued What is the appropriate next step in thie patient’s management? A. Inhaled beta agonists, intravenous corticosteroids, supplemental oxygen, and intravenous theophylline for a COPD exacerbation B. Intravenous levofloxacin 500mg daily for a right upperlobe pneumonia C. Chest tube placement for spontaneous pneumothorax secondary to a ruptured bleb D. Acute coronary syndrome protocol for acute inferior wall MI E. Intravenous loop diuretic for decompensated right sided heart failure F. Intravenous heparin for a saddle-embolus