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Exacerbations in non-COPD patients: truth or myth
  1. Deepak Aggarwal1,
  2. Alkesh Kumar Khurana2
  1. 1 Department of Pulmonary Medicine, Government Medical College & Hospital, Chandigarh, India
  2. 2 Department of Pulmonary Medicine, All India Institute of Medical Sciences, Bhopal, Madhya Pradesh, India
  1. Correspondence to Dr Alkesh Kumar Khurana, Department of Pulmonary Medicine, All India Institute of Medical Sciences, Bhopal, Madhya Pradesh 462024, India; lungcancer{at}

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We read with great interest the article by Tan et al,1 whereby they have discussed the occurrence of exacerbation-like events in patients without COPD. The basic concept of the study needs debate and clarification.

The authors have used the terms ‘non-COPD patients’ and ‘exacerbation like event’ to mention the group of patients who didn't fulfil the spirometric criteria for COPD. Without mentioning its causes, this non-COPD group with chronic respiratory symptoms …

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  • Respiratory epidemiology
    W C Tan J Bourbeau P Hernandez K R Chapman R Cowie J M FitzGerald D D Marciniuk F Maltais A S Buist D E O'Donnell D D Sin S D Aaron for the CanCOLD Collaborative Research Group Jonathon Samet Milo Puhan Qutayba Hamid James C Hogg Jean Bourbeau Wan C Tan Carole Jabet Maria Sedona Palmina Mancino Yvan Fortier Don Sin Yuexin Li Sheena Tam Joe Comeau Adrian Ng Harvey Coxson Tara Candido Jonathon Leipsic Cameron Hague Jeremy Road Andrea Benedetti Carlo Mara Mohsen Savafi Andrea Gershon Teresa To Wan C Tan Harvey Coxson Jean Bourbeau Zhi L Pei Denis Jensen Denis O’Donnell Wan C Tan Christine Lo Jeong Min Carly Moy Anna La Lau Ashleigh Sran Ebony Swanson Ying Yuan Daniel Chen Lu Zheng Tina Yang Junior Chuang Best Guo Licong Li Kendall Chan Rahmath Khanam Daria Maslennikova Sarah Cheng Catherine Peng Bryan Chiang Sarah Guo Kyrsten Payne Jean Bourbeau Palmina Mancino Maria Sedona Carmen Darauay Myriam Costa Kenneth Chapman Patricia McClean Heather Sporn Robert Cowie Ann Cowie Curtis Dumonceaux Jessica Moore Paul Hernandez Scott Fulton Maria Yorke Natalie Fiorotos Ashley Rowe Shawn Aaron Kathy Vandemheen Gay Pratt Jeevitha Srighanthan Denis O’Donnell Kathy Webb Naparat Amornputtisathaporn Kate Cheung Kate Whelan Jenny Cheng Francois Maltais Joanie Couture Luciana Garcia Pereira Marie-Josée Breton Cynthia Brouillard Darcy Marciniuk Ron Clemens Janet Baran
  • PostScript
    Wan C Tan Jean Bourbeau Shawn Aaron J Mark FitzGerald Paul Hernandez Robert Cowie Kenneth R Chapman Darcy Marciniuk Francois Maltais Sonia Buist Denis O'Donnell Don D Sin