Reed Abelson
Julie Appleby
Catherine Arnst
Bill Berkrot
John Carreyrou
Elizabeth Cohen
Susan Dentzer
Jennifer Corbett Dooren
Katherine Eban
Miriam Falco
Jared A. Favole
Maggie Fox
Avram Goldstein
Jacob Goldstein
Kristen Hallam
Gardiner Harris
Susan Heavey
Matthew Herper
Mike Huckman
Andrew Jack
Avery Johnson
Linda A. Johnson
Trista Kelley
Lewis Krauskopf
Laura Landro
Robert Langreth
Catherine Larkin
John Lauerman
Michael Lee
Peter Loftus
Elizabeth Lopatto
Anna Wilde Matthews
Alicia Mundy
Lauran Neergaard
Alice Park
Tara Parker-Pope
Robert Pear
Matthew Perrone
Shannon Pettypiece
Ransdell Pierson
Tom Randall
Lisa Rapaport
Lisa Richwine
Jonathan D. Rockoff
Sarah Rubenstein
Julie Schmit
Natasha Singer
Bernadette Tansey
Albertina Torsoli
Michael Waldholz
Shirley Wang
Arlene Weintraub
Jeanne Whalen
Duff Wilson
Ron Winslow
Jane Zhang
Angela Zimm

« FT's Andrew Jack Has the Scoop on Sanofi-Aventis Expansion Plans | Main | Speaking of Health Reporters: Deborah Kotz, U.S. News & World Report »

02/03/2009

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Usually, energy is only required for inhalation to inflate the lungs. The stretch of the lungs and distension of the chest cavity springs back to rest during exhalation, a passive process that does not require energy. However, in emphysema, inefficient breathing occurs because extra effort and energy has to be expended to empty the lungs of air due to the collapse of the airways. This essentially doubles the work of breathing, since now energy is required for both inhalation and exhalation. In addition, because of the reduced capacity to exchange gases with each breath (due to the collapse of the bronchioles and loss of capillaries), it is necessary to breathe more frequently.

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