A diagnosis of COPD should be considered in any patient who has dyspnea, chronic cough, and/or sputum production and an appropriate history of exposure to noxious stimuli. However, not all patients with these symptoms have COPD, and a spirometry demonstrating a post-bronchodilator forced expiratory volume in one second to forced vital capacity (FEV1/FVC) ratio < 70% (or less than the lower limit of normal, if available) is required to make a definitive diagnosis. Starting maintenance inhalers without first objectively diagnosing COPD results in unnecessary treatment in those patients who do not actually have the disease. In turn, this exposes these patients to both the side-effects and the cost of these medications, and might delay the appropriate diagnosis.
Global Initiative for Chronic Obstructive Lung Disease (GOLD). GOLD 2017 Global Strategy for the Diagnosis, Management and Prevention of COPD [Internet]. 2017 [cited 2017 May 5].
Qaseem A, et al. Diagnosis and management of stable chronic obstructive pulmonary disease: a clinical practice guideline update from the American College of Physicians, American College of Chest Physicians, American Thoracic Society, and European Respiratory Society. Ann Intern Med. 2011 Aug 2;155(3):179-91. PMID: 21810710.
United States of America Department of Veterans Affairs and the Department of Defense. VA/DoD Clinical Practice Guideline for the Management of Chronic Obstructive Pulmonary Disease [Internet]. 2014 Dec [cited 2017 May 5].Share on Facebook Share on Twitter
CT scan screening has no proven benefit in patients who are not at high risk for lung cancer, regardless of age, smoking history or other risk factors. Low dose chest CT screening has been found to reduce lung cancer mortality in a well-defined population of patients at high risk for lung cancer, defined by age 55-74, at least a 30-pack year history of tobacco use, and smoking within the last 15 years. However, screening is also associated with several harms, including false-negative and false-positive results, incidental findings, overdiagnosis (detecting indolent and clinically insignificant tumors that would not have been detected in the patient’s lifetime without screening), and cumulative exposure to radiation (which can cause cancer). Screening also leads to unnecessary anxiety and invasive procedures, which carry their own complications. Accordingly, it should not be used in patients who do not meet these strict criteria, nor in patients with a health problem that substantially limits life expectancy or the ability or willingness to have curative therapy.
Bach PB, et al. Benefits and harms of CT screening for lung cancer: a systematic review. JAMA. 2012 Jun 13;307(22):2418-29. PMID: 22610500.
Canadian Task Force on Preventive Health Care, et al. Recommendations on screening for lung cancer. CMAJ. 2016 Apr 5;188(6):425-32. PMID: 26952527.
Moyer VA, et al. Screening for lung cancer: U.S. Preventive Services Task Force recommendation statement. Ann Intern Med. 2014 Mar 4;160(5):330-8. PMID: 24378917.
National Lung Screening Trial Research Team, et al. Reduced lung-cancer mortality with low-dose computed tomographic screening. N Engl J Med. 2011 Aug 4;365(5):395-409. PMID: 21714641.
Patz EF Jr, et al. Overdiagnosis in low-dose computed tomography screening for lung cancer. JAMA Intern Med. 2014 Feb 1;174(2):269-74. PMID: 24322569.Share on Facebook Share on Twitter
The majority of adults with chest pain and/or dyspnea do not have a pulmonary embolism (PE). There is strong evidence that in patients with low pre-test probability as determined by a clinical prediction rule (e.g., Wells score), a negative highly sensitive D-dimer assay effectively excludes clinically important PE. Furthermore, there are potential harms to performing CT pulmonary angiography (CTPA) or ventilation-perfusion (V/Q) scanning, including exposure to ionizing radiation, adverse events due to the administration of intravenous contrast, and identification of clinically insignificant PE leading to inappropriate anticoagulation. However, physicians should exercise clinical judgement in populations in whom this two-step algorithm has not been validated (e.g., pregnant patients).
Crawford F, et al. D-dimer test for excluding the diagnosis of pulmonary embolism. Cochrane Database Syst Rev. 2016 Aug 5;(8):CD010864. PMID: 27494075.
Fesmire FM, et al. Critical issues in the evaluation and management of adult patients presenting to the emergency department with suspected pulmonary embolism. Ann Emerg Med. 2011 Jun;57(6):628-652.e75. PMID: 21621092.
Torbicki A, et al. Guidelines on the diagnosis and management of acute pulmonary embolism: the Task Force for the Diagnosis and Management of Acute Pulmonary Embolism of the European Society of Cardiology (ESC). Eur Heart J. 2008 Sep;29(18):2276-315. PMID: 18757870.
Wiener RS, et al. Time trends in pulmonary embolism in the United States: evidence of overdiagnosis. Arch Intern Med. 2011 May 9;171(9):831-7. PMID: 21555660.Share on Facebook Share on Twitter
The majority of adults with a short duration of cough from an acute respiratory tract infection have a viral rather than a bacterial infection. Patients often underestimate the typical cough duration from an infectious illness, and when cough does not resolve within their expected time frame, may request antibiotics. The average duration of cough (not treated with antibiotics) is around 18 days, though patients only expect to cough for 5 to 7 days. Use of immediate or delayed antibiotics does not change clinical outcomes compared to no antibiotics in these situations. On the other hand, the harms of over-prescribing antibiotics include medication costs, adverse reactions, and the possibility of inducing bacterial resistance to antibiotics. Physicians should educate patients about the expected duration of cough and the consequences of inappropriate antibiotic use in acute respiratory tract infections.
Ebell MH, et al. How long does a cough last? Comparing patients’ expectations with data from a systematic review of the literature. Ann Fam Med. 2013 Jan-Feb;11(1):5-13. PMID: 23319500.
McNulty CA, et al. Expectations for consultations and antibiotics for respiratory tract infection in primary care: the RTI clinical iceberg. Br J Gen Pract. 2013 Jul;63(612):e429-36. PMID: 23834879.
Smith SM, et al. Antibiotics for acute bronchitis. Cochrane Database Syst Rev. 2014 Mar 1;(3):CD000245. PMID: 24585130.
Snow V, et al. Principles of appropriate antibiotic use for treatment of acute bronchitis in adults. Ann Intern Med. 2001 Mar 20;134(6):518-20. PMID: 11255531.
Spurling GK, et al. Delayed antibiotics for respiratory infections. Cochrane Database Syst Rev. 2013 Apr 30;(4):CD004417. PMID: 23633320.Share on Facebook Share on Twitter
Although international guidelines uniformly recommend objective testing to establish an asthma diagnosis, this diagnosis is often made clinically and asthma medications are often initiated on that clinical basis. However, physical exam findings and symptoms such as cough, wheeze, and/or dyspnea can be caused by other conditions. As a result, up to one third of patients who have been diagnosed with asthma do not have evidence of asthma when objectively tested with pulmonary function tests. A false clinical diagnosis of asthma may delay diagnosis of the actual underlying condition, which may include serious cardiorespiratory conditions. Furthermore, patients with a false diagnosis of asthma who are started on asthma medications are unnecessarily exposed to both the side-effects and the costs of these medications. It should be noted, however, that this recommendation may not be applicable in patients who cannot reproducibly undergo objective testing for asthma (including children less than 6 years old), and in settings where such testing is not available.
Aaron SD, et al. Reevaluation of Diagnosis in Adults With Physician-Diagnosed Asthma. JAMA. 2017 Jan 17;317(3):269-279. PMID: 28114551.
British Thoracic Society/Scottish Intercollegiate Guidelines Network. BTS/SIGN British guideline on the management of asthma [Internet]. 2017 Apr [cited 2017 May 5].
Global Initiative for Asthma. 2017 GINA Report, Global Strategy for Asthma Management and Prevention [Internet]. 2017 [cited 2017 May 5].
Lougheed MD, et al. Canadian Thoracic Society 2012 guideline update: diagnosis and management of asthma in preschoolers, children and adults. Can Respir J. 2012 Mar-Apr; 19(2): 127–164.Share on Facebook Share on Twitter
Asthma exacerbations are characterized by decreased expiratory airflow as well as increased shortness of breath, cough, wheezing, chest tightness, or a combination of these symptoms. When such an attack is precipitated by an infection, it is much more likely to be viral than bacterial. The role of bacterial infection is often overestimated; however antibiotics should be reserved for relatively rare cases in which there is strong evidence of a bacterial infection, such as pneumonia or bacterial sinusitis. Potential harms of unnecessary antibiotic treatment include medication costs, side-effects (including a risk of allergy), and emergence of bacterial resistance.
Aldington S, et al. Asthma exacerbations. 5: assessment and management of severe asthma in adults in hospital. Thorax. 2007 May;62(5):447-58. PMID: 17468458.
Bousquet J, et al. Uniform definition of asthma severity, control, and exacerbations: document presented for the World Health Organization Consultation on Severe Asthma. J Allergy Clin Immunol. 2010 Nov;126(5):926-38. PMID: 20926125.
British Thoracic Society / Scottish Intercollegiate Guidelines Network. BTS/SIGN British guideline on the management of asthma [Internet]. 2017 Apr [cited 2017 May 5].
Chung KF, et al. International ERS/ATS guidelines on definition, evaluation and treatment of severe asthma. Eur Respir J. 2014 Feb;43(2):343-73. PMID: 24337046.
Schatz M, et al. Joint task force report: supplemental recommendations for the management and follow-up of asthma exacerbations. Introduction. J Allergy Clin Immunol. 2009 Aug;124(2 Suppl):S1-4. PMID: 19647130.Share on Facebook Share on Twitter