Causes and Clinical Features of Subacute Cough*
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1 Original Research COUGH Causes and Clinical Features of Subacute Cough* Nam-Hee Kwon, MD; Mi-Jung Oh, MD; Tae-Hoon Min, MD; Byung-Jae Lee, MD, PhD; and Dong-Chull Choi, MD, PhD Study objectives: Cough lasting > 3 weeks has been defined as chronic cough. However, it might be more persuasive to divide cough into subacute, lasting 3 to 8 weeks, and chronic, lasting > 8 weeks. We evaluated the causes and clinical courses of subacute cough, and the value of the bronchoprovocation test and induced sputum examination (IS). Methods: Nonsmoking patients with cough of 3 to 8 weeks duration were enrolled into the study. Patients with dyspnea, basal FEV 1 of < 70% predicted, abnormal findings on a plain chest radiograph or physical examination were excluded. We prescribed an antihistamine-decongestant for patients who were suspected to have postinfectious cough or postnasal drip. If patients had positive results on a bronchoprovocation test or IS, therapy with inhaled corticosteroids was substituted according to an algorithmic approach. Results: One hundred eighty-four patients (77 men and 107 women) were evaluated; the mean age of the study group was 47.5 years. Eighty-nine of 184 patients had postinfectious cough. Cough resolved without treatment in 62 patients. Twenty-nine of 43 patients with positive bronchoprovocation test results had cough-variant asthma. Conclusions: Postinfectious cough was the most common cause of subacute cough. The spontaneous resolution of cough was frequent in patients with subacute cough. Unless asthma was strongly suspected, the performance of the bronchoprovocation test could be delayed until after empirical treatment had been administered. (CHEST 2006; 129: ) Key words: cough; diagnosis; treatment Abbreviations: BHR bronchial hyperresponsiveness; GERD gastroesophageal reflux disease; ICS inhaled corticosteroid; IS induced sputum examination; MBPT methacholine bronchial provocation test; PC 20 provocative concentration of methacholine causing a 20% fall in FEV 1 ; PND postnasal drip; PPV positive predictive value A cough lasting for 3 weeks has generally been accepted as a chronic cough. 1 It has been suggested that some patients with a chronic cough should not be treated symptomatically, but first should be evaluated for the causes of the cough. It has been widely accepted for 20 years that the causes of chronic cough can be proven in 88 to 100% *From the Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. Manuscript received October 25, 2005; revision accepted December 13, Reproduction of this article is prohibited without written permission from the American College of Chest Physicians ( org/misc/reprints.shtml). Correspondence to: Dong-Chull Choi, MD, PhD, Associate Professor, Division of Allergy, Department of Medicine, Samsung Medical Center, 50 Ilwon-dong, Kangnam-Gu, Seoul, Korea ; dcchoi@smc.samsung.co.kr of patients with a diagnostic algorithm regarding the causes of chronic cough. 2,3 The common causes of chronic cough are postnasal drip (PND), coughvariant asthma, and gastroesophageal reflux disease (GERD). 4 6 The recent report 7 regarding the algorithmic approach in patients with chronic cough lasting for 8 weeks confirmed the common causes of chronic cough. We recognized that many patients whose chief complaint was a cough lasting for 3 weeks spontaneously improved without treatment. Spontaneously resolving cough was exceedingly rare in patients who experienced a long duration of cough, such as several months or years. Thus, patients with cough of a relatively short duration must be regarded separately from patients with a cough of a longer duration Original Research
2 Irwin and Madison 3 subdivided cough in terms of duration into subacute cough, lasting from 3 to 8 weeks, and chronic cough, lasting for 8 weeks. They listed postinfectious cough, sinusitis, PND, and bronchial asthma as common causes of subacute For editorial comment see page 1121 cough, and recommended that patients with subacute cough should first be treated symptomatically. Pratter and colleagues 8 reported that when patients were prescribed antihistamines and decongestants, significant improvements were observed in 55% of the patients with chronic cough. However, the data regarding the causes and clinical courses of chronic cough with shorter duration remained scarce. Therefore, our intention was to prospectively evaluate the causes and clinical courses of subacute cough, and to determine whether any clinical differences exist between subacute and chronic cough. Patient Selection Materials and Methods In this study, we defined subacute cough as cough lasting 3 to 8 weeks, and chronic cough as cough lasting 8 weeks. From April 2001 to August 2003, patients with a chief complaint of subacute cough were enrolled in the study. The following were exclusion criteria: (1) current or past dyspnea; (2) wheezing or rales on physical examination; (3) decreased lung function (FEV 1 of 70% predicted; (4) abnormal findings on plain chest radiograph; (5) current smoking; and (6) use of an angiotensinconverting-enzyme inhibitor within the past 2 months. The study was approved by the research ethics committee, and all subjects gave a written informed consent. Methacholine Responsiveness A methacholine bronchial provocation test (MBPT) was performed according to American Thoracic Society guidelines, 9 using a spirometer (V max 2130; SensorMedics; Yorba Linda, CA). Methacholine chloride (Sigma-Aldrich; St. Louis, MO) diluted with physiologic saline solution was inhaled using a nebulizer (Pari-Master 084G7300; PulmoMed; Nanterre Cedex, France) as a five-breath dosimeter protocol. The provocative concentration of methacholine causing a 20% fall in FEV 1 (PC 20 ) was adopted as the marker for bronchial hyperresponsiveness (BHR). BHR was defined as a PC 20 of 8 mg/ml. Induced Sputum Examination Sputum was induced by the inhalation of hypertonic saline solution. After spirometric values were recorded and 15 min before sputum induction, subjects inhaled 200 g of salbutamol via a metered-dose inhaler. Then a 4.5% saline solution was administered at room temperature for 5 min using a nebulizer (Pari-Master 084G7300; PulmoMed). Subjects were encouraged to cough up sputum into a sterile container after rinsing their mouth and throat, and this process was repeated three times. After measuring the weight of the sputum, an aliquot was treated with 0.1% dithiothreitol and was kept at 37 C for 15 min. The mixture was further diluted with phosphate-buffered saline solution and was centrifuged at 2,000 revolutions per minute for 5 min. Cell pellets were resuspended. Slides were prepared by using a Cytospin instrument (Shandon Scientific Ltd; Shandon, UK) and were stained (Diff-Quick; American Scientific Products; Chicago, IL) for differential cell counts. We regarded the prepared sample as being inadequate if squamous cells accounted for 30% of cells. At least 300 nonsquamous cells were counted in each slide. Differential counts of eosinophils, neutrophils, macrophages, lymphocytes, and epithelial cells were counted. Eosinophilic inflammation was defined as an eosinophil percentage of 3%. Study Design Enrolled patients were evaluated and treated prospectively according to an algorithm (Fig 1). The initial evaluation was conducted at the first visit; a questionnaire on the duration, frequency, severity, aggravating factors, and other combined symptoms such as PND, nasal itching, sneezing, rhinorrhea, and gastroesophageal reflux-related symptoms. Pulmonary function studies, plain chest radiographs, MBPT, and induced sputum examination (IS) were also performed in all enrolled subjects. We then decided on a series of sequential diagnostic therapeutic steps that evolved into the following algorithm. All patients had a second visit within 7 to 10 days after first visit. At that time, patients whose cough had resolved were grouped separately. PND was considered if patients had a history of frequent symptoms of PND or a cobblestone appearance on physical examination, or if they ordinarily had more than two of the following symptoms: nasal stuffiness; rhinorrhea; sneezing; or nasal itching. For these patients, an antihistamine-decongestant (ie, 4 mg of chlorpheniramine and 30 mg of pseudoephedrine orally three times a day) was administered for 3 weeks. If cough improved, a final diagnosis of PND was made. Postinfectious cough was considered when the cough was initiated by a common cold and did not fulfill the other disease criteria. We diagnosed the common cold clinically when symptoms such as dry cough, sore throat, and nonpurulent nasal discharge, with or without mild headache were present in previously healthy patients. The patient should not have those symptoms seasonally. For these patients, the same medications as those administered for the relief of their symptoms were given. If cough improved, postinfectous cough was diagnosed. For patients who exhibited no suggestive symptoms of postinfectous cough or PND, and whose conditions did not improve satisfactorily, the results of MBPT and IS were reviewed. An inhaled corticosteroid (ICS) with or without a long-acting 2 - agonist (Symbicort turbuhaler, 160/4.5 g/puff, or Pulmicort turbuhaler, 200 g/puff bid; AstraZeneca; Wilmington, DE) was prescribed for 2 weeks for patients with a positive result. In patients whose cough improved after therapy with an ICS, bronchial asthma was diagnosed in those with positive results from the MBPT, and eosinophilic bronchitis was diagnosed in those with positive results from the IS and negative results from the MBPT. Patients with persistent cough and negative results from both the MBPT and IS proceeded to the next steps, which included 24-h ph monitoring, CT scan of the lung, or bronchoscopy. Twenty-four hour ph monitoring was performed using a catheter (Digitrapper MK Gold III; Synectics Medical AB; Stockholm, Sweden). GERD was defined when the DeMeester composite score was 14.7 or when the percentage of the total time spent with a ph of 4 was 4.5% CHEST / 129 / 5/ MAY,
3 Figure 1. Algorithmic approach to subacute cough. If there were possibilities of postinfectious cough (postinf) or PND, an antihistamine-decongestant was prescribed for 3 weeks. Next, the results of the MBPT or IS were considered. CS corticosteroid; CV asthma cough-variant asthma; EB eosinophilic bronchitis; * all patients underwent the MBPT and IS at the first visit, but the results affected the next step at this point. Patient Characteristics Results Two hundred forty-three patients visited our clinic due to subacute cough during the study period. Among those patients, 184 patients fulfilled the inclusion criteria. The mean ( SD) age was years (age range, 17 to 76 years). The ratio of men to women was 77:107. The mean basal FEV 1 was % predicted, and the mean FEV 1 /FVC ratio was %. Frequency of the Causes of Subacute Cough Eighty-nine of 184 patients (48.4%) had postinfectious cough, 61 of 184 patients (33.2%) had PND, and 29 of 184 patients (15.8%) had cough-variant asthma. No patients had GERD (Fig 2). If the causes of subacute cough were analyzed only in the 62 patients with spontaneously resolving cough, 46 patients (74.3%) had postinfectious cough. A single cause for the cough was identified in 156 patients (84.9%), while cough was attributed to two causes in 21 patients (11.4%). The cause for cough was not determined in seven patients (3.8%). Clinical Courses and Therapeutic Results of Subacute Cough In 62 of 184 patients (33.7%), cough improved spontaneously without any treatment. We prescribed an antihistamine-decongestant for 3 weeks to 97 of 122 patients whose cough was persistent. Seventytwo patients were suspected to have symptoms or signs of PND, and 25 patients had postinfectious cough. After the 3-week treatment period, 68 patients (70.1%) showed significant improvement (Fig 3). Forty-three of all 184 patients (23.4%) had positive results from the MBPT, and 8 patients improved without treatment. In 25 patients who had no symptoms and signs of PND or postinfectious cough and in 29 patients who did not respond to treatment, 28 patients (51.9%) had positive results for the MBPT, 32 had positive results on the IS, and 22 had positive results for both. Cough improved in 35 of these 38 patients after therapy with an ICS. Positive Predictive Value of MBPT and IS Twenty-nine of 43 patients who had BHR and responded to an ICS were diagnosed with coughvariant asthma. Therefore, the positive predictive value (PPV) of the MBPT was 67.4%. When subjects were limited to 122 patients who had persistent cough at the second visit, cough-variant asthma was diagnosed in 26 of 35 patients who had BHR. In this case, the PPV of the MBPT was higher at 74.3%. Sputum eosinophilia of 3.0% was present in 43 patients with subacute cough. The PPV of the IS was 55.8% because cough-variant asthma was diagnosed in 24 of 43 patients. When only the patients with 1144 Original Research
4 Figure 2. Causes of subacute cough (black column) and spontaneously resolving cough (white column). Postinfectious cough was the most common in the subacute cough group, especially in the spontaneous resolving cough group. The frequency of eosinophilic bronchitis was 5.4% (10 patients) in the subacute cough group. The percentages of postinfectious cough were as follows: spontaneously resolving cough group, 4.3%; PND group, 16.1%; cough-variant asthma group, 4.8%; eosinophilic bronchitis group, 1.6%. See the legend of Figure 1 for abbreviations not used in the text. persistent cough were analyzed, cough-variant asthma was diagnosed in 22 of 38 patients with eosinophilic inflammation. The PPV was 57.9%. The PPV of cough-variant asthma was as high as 96.0% when we evaluated patients who had undergone both the MBPT and IS at the same time. Discussion We analyzed prospectively the causes of subacute cough, and our algorithmic approach with initial use of an antihistamine-decongestant was effective. During the study period, 529 patients complained of subacute cough and chronic cough; 184 patients (34.8%) were regarded as having subacute cough. In patients with subacute cough, 62 improved without medication at the second visit, and the cough was not aggravated again during the study period. The percentage of self-limited cough was higher in the subacute cough group compared to that of the chronic cough group (11.9%; 103 of 529 patients). Sixty percent of spontaneously resolving coughs belonged to patients in the subacute cough group. These data showed that the conditions of many patients, especially those with subacute cough, could improve without treatment. Although PND, cough-variant asthma, and GERD have been regarded as frequent causes of chronic cough in previous reports, the most common cause of subacute cough in our study was postinfectious cough. We defined postinfectious cough as a cough that began with symptoms related to the common cold without any abnormal findings on plain chest radiograph and did not meet the criteria for PND. Eighty-nine patients with subacute cough (48.4%) had postinfectious cough, 61 patients had PND (33.2%), and 29 patients had cough-variant asthma (15.8%). In contrast, notably only 4.6% of coughs lasting 8 weeks (data not shown) were caused by postinfectious cough in our experience. To summarize, postinfectious cough was the most common cause of subacute cough and had a higher rate of spontaneous resolution. Therefore, when the duration of cough is not long, a diagnosis of postinfectious cough should be considered and the cough could improve without the use of medications. The reason to differentiate postinfectious cough from PND in this study was to reduce the use of unnecessary drugs, since postinfectious cough has a high possibility of spontaneous improvement. If patients had one of the following criteria, we diagnosed PND: (1) current or past PND; (2) cobblestone appearance on posterior pharyngeal wall on physical examination; and (3) if patients had more than two of following symptoms: rhinorrhea; sneezing; nasal itching; and nasal obstruction. If the patients complained of only a sense of a foreign body in the pharynx, and had a clear history of cough starting with a common cold, we assumed it to be a postinfectious cough. We also applied the same criteria in patients who exhibited persistent cough and restrictively diagnosed specific diseases in the patients who responded to therapy with an antihistamine-decongestant. We suggested that the incidence of postinfectious cough was increased proportionally when we limited the subjects to a subacute period and spontaneously resolving cough. Therefore, it is important to acknowledge that the determination of the cause of subacute cough is necessary in terms of effectiveness and cost. It was interesting that the incidence of GERD was low in our study. Chronic cough due to GERD has been reported as the third most common cause of chronic cough in nonsmokers, at 10 to 20%, and up to 40%. 7,11 13 In our study, no patient had a cough due to GERD when we confined the cough to the subacute period. The following explanations are possible: (1) the mean duration of GERD was much longer than that of other diseases, reportedly 13 to 58 months 6,14 ; (2) we delayed 12-h ph monitoring if the patients with subacute cough did not complain of esophageal symptoms like acid regurgitation or CHEST / 129 / 5/ MAY,
5 Figure 3. The annotated algorithm showing the numbers of patients and the diagnoses reached. Patients whose cough resolved without treatment were grouped separately. Postinfectious cough or PND was diagnosed in patients whose cough improved after therapy with an antihistaminedecongestant. Cough-variant asthma or eosinophilic bronchitis was diagnosed when cough improved after therapy with an ICS. See the legend of Figure 1 for abbreviations not used in the text. heartburn; or (3) the incidence of GERD itself might be lower in Asians. It has been reported that the prevalence of GERD was 6.6% in Japan. 15 Pertussis is considered an important cause of persistent cough in adults. A prevalence for pertussis of 12.4 to 26% has been reported in studies from the United States. 16 In this study, we did not routinely check for Bordetella pertussis infection because there were no standard serologic methods for pertussis detection, and polymerase chain reaction had limitations in practice, even though it was sensitive and specific. Moreover, the incidence of pertussis proven by polymerase chain reaction in Korea was only 2.9%. 17 It is possible that some pertussis patients might be included as postinfectious cough patients because B pertussis with chronic cough could disappear spontaneously. The MBPT showed that 43 patients had BHR, but only 29 of 43 patients were confirmed to have cough-variant asthma. The remaining 14 patients consisted of those with PND and postinfectious cough, which could be explained by transient hyperresponsiveness (eight patients improved without treatment, and 6 patients improved after therapy with only an antihistamine-decongestant). In our study, the PPV of the MBPT was 67.4%. Generally, sensitivity is 100% and the PPV is 60 to 82% when the positive criteria is a PC 20 of 8 mg/ml. 1,18 The duration of postinfectious cough was much shorter than that of cough-variant asthma when the comparison included patients with a cough of longer duration (Fig 4). We could infer that when more patients with cough of a longer duration were included, the incidence of cough-variant asthma increased and the PPV of the MBPT might be higher. In contrast, when the cough duration of enrolled patients was relatively short, the incidence of postinfectious cough increased and the PPV of the MBPT was low. In our study, the reason for this low PPV was due not only to the wide positive criteria in PC 20, but also, more importantly, to the confinement of subjects to a subacute period of cough. We assume that the discrepancy regarding PPV in previous reports was due to various durations of cough. In conclusion, we systematically evaluated the causes and clinical courses of subacute cough. We confirmed that postinfectious cough was the most common cause of cough during the subacute period. Spontaneous resolution of cough without specific treatment was high, and the preliminary use of an antihistamine-decongestant was effective. These observations confirmed that we could improve efficiency by delaying specific laboratory tests or by conducting tests only in patients with a strongly suggestive history of bronchial asthma Original Research
6 Figure 4. The mean duration of cough according to the causes of cough. The causes of chronic cough lasting 3 weeks including subacute cough in the study period were analyzed by one-way analysis of variance. See the legend of Figure 1 for abbreviations not used in the text. References 1 Irwin RS, Boulet LP, Cloutier MM, et al. Managing cough as a defense mechanism and a symptom. Chest 1998; 114(suppl):S133 S181 2 Irwin RS, Rosen MJ, Bramann SS. Cough: a comprehensive review. Arch Intern Med 1977; 137: Irwin RS, Madison JM. The diagnosis and treatment of cough. N Engl J Med 2000; 343: Irwin RS, Curley FJ, French CL. The spectrum and frequency of causes, key components of the diagnositc evaluation, and outcome of specific therapy. Am Rev Respir Dis 1990; 141: Irwin RS, Madison JM. Diagnosis and treatment of chronic cough due to gastro-esophageal reflux disease and postnasal drip syndrome. Pulm Pharmacol Ther 2002; 15: McGarvey LP, Heaney LG, Lawson JT, et al. Evaluation and outcome of patients with chronic non-productive cough using a comprehensive diagnostic protocol. Thorax 1998; 53: Kastelik JA, Aziz I, Ojoo JC, et al. Investigation and management of chronic cough using a probability-based algorithm. Eur Respir J 2005; 25: Pratter MR, Bartter T, Akers S, et al. An algorithmic approach to chronic cough. Ann Intern Med 1993; 119: American Thoracic Society. Guidelines for methacholine and exercise challenge testing: Am J Respir Crit Care Med 2000; 161: Madan K, Ahuja V, Gupta SD, et al. Impact of 24-h esophageal ph monitoring on the diagnosis of gastroesophageal reflux disease: defining the gold standard. J Gastroenterol Hepatol 2005; 20: Morice AH. Epidemiology of cough. Pulm Pharmacol Ther 2002; 15: Kiljander TO, Salomaa ERM, Hietanen EO, et al. Chronic cough and gastro-oesophageal reflux: a double-blind placebocontrolled study with omeprazole. Eur Respir J 2000; 16: Poe RH, Kallay MC. Chronic cough and gastroesophageal reflux disease. Chest 2003; 123: Irwin RS, Richter JE. Gastroesophageal reflux and chronic cough. Am J Gastroenterol 2000; 95:S9 S14 15 Fujiwara Y, Higuchi K, Watanabe Y, et al. Prevalence of gastroesophageal reflux disease and gastroesophageal reflux disease symptoms in Japan. J Gastroenterol Hepatol 2005; 20: Couzigou C, Flahault A. Is pertussis being considered as a cause of persistent cough among adults? Eur J Epidemiol 2003; 18: Park WB, Park SW, Kim HB, et al. Pertussis in adults with persistent cough in South Korea. Eur J Clin Microbiol Infect Dis 2005; 24: Fish JE, Peters SP. Bronchial challenge testing. In: Adkinson NF, Yunginger JW, eds. Middletion s allergy principles and practice. 6th ed. Philadelphia, PA: Mosby, 2003; CHEST / 129 / 5/ MAY,
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