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Dyspnoea as a predictor of cause-specific heart/lung disease mortality in Bangladesh: a prospective cohort study
  1. Gene R Pesola1,2,
  2. Maria Argos3,
  3. Vernon M Chinchilli4,
  4. Yu Chen5,
  5. Faruque Parvez6,
  6. Tariqul Islam7,
  7. Alauddin Ahmed7,
  8. Rabiul Hasan7,
  9. Muhammad Rakibuz-Zaman7,
  10. Habibul Ahsan1,3,6,7
  1. 1Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York, USA
  2. 2Section of Pulmonary/Critical Care, Department of Medicine, Harlem Hospital affiliated with Columbia University, New York, New York, USA
  3. 3Department of Health Sciences, University of Chicago, Chicago, Illinois, USA
  4. 4Department of Public Health Sciences, Penn State College of Medicine, Hershey, Pennsylvania, USA
  5. 5Department of Environmental Sciences, NYU Langone Medical Center, New York, New York, USA
  6. 6Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, New York, USA
  7. 7University of Chicago Research (URB), Ltd., Dhaka, Bangladesh
  1. Correspondence to Dr Gene R Pesola, Section of Pulmonary/Critical Care Medicine, Department of Medicine, Harlem Hospital, MLK 14th floor, 506 Lenox Ave, New York, NY 10037, USA; grp4{at}columbia.edu

Abstract

Background The spectrum of mortality outcomes by cause in populations with/without dyspnoea has not been determined. The study aimed to evaluate whether dyspnoea, a symptom, predicts cause-specific mortality differences between groups. The hypothesis was that diseases that result in chronic dyspnoea, those originating from the heart and lungs, would preferentially result in heart and lung disease mortality in those with baseline dyspnoea (relative to no dyspnoea) when followed over time.

Methods A population-based sample of 11 533 Bangladeshis was recruited and followed for 11–12 years and cause-specific mortality evaluated in those with and without baseline dyspnoea. Dyspnoea was ascertained by trained physicians. The cause of death was determined by verbal autopsy. Kaplan-Meier survival curves, the Fine-Gray competing risk hazards model and logistic regression models were used to determine group differences in cause-specific mortality.

Results Compared to those not reporting dyspnoea at baseline, the adjusted HRs were 6.4 (3.8 to 10.7), 9.3 (3.9 to 22.3), 1.8 (1.2 to 2.8), 2.2 (1.0 to 5.1) and 2.8 (1.3 to 6.2) for greater risk of dying from chronic obstructive pulmonary disease (COPD), asthma, heart disease, tuberculosis and lung cancer, respectively. In contrast, there was a similar risk of dying from stroke, cancer (excluding lung), liver disease, accidents and other (miscellaneous causes) between the dyspnoeic and non-dyspnoeic groups. In addition, the HR was 2.1 (1.7 to 2.5) for greater all-cause mortality in those with baseline dyspnoea versus no dyspnoea.

Conclusions Dyspnoea, ascertained by a single question with binary response, predicts heart and lung disease mortality. Individuals reporting dyspnoea were twofold to ninefold more likely to die of diseases that involve the heart and/or lungs relative to the non-dyspnoeic individuals. Therefore, in those with chronic dyspnoea, workup to look for the five common dyspnoeic diseases resulting in increased mortality (COPD, asthma, heart disease, tuberculosis and lung cancer), all treatable, should reduce mortality and improve the public health.

  • AVOIDABLE DEATHS
  • Cardiovascular disease
  • Clinical epidemiology
  • Epidemiology of chronic diseases
  • LONGITUDINAL STUDIES

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