American Journal of Respiratory and Critical Care Medicine Vol 166. pp. 1534-1536, (2002)
© 2002 American Thoracic Society
Compliance (COMmunicate PLease wIth Less Abbreviations, Noun Clusters, and Exclusiveness)
Martin J. Tobin, Editor
Abbreviations: AGA = appropriate for gestational age AR = arousal BLM = bleomycin CTL = control CTL = cytotoxic T lymphocytes CR = complete response DH = dynamic hyperinflation DH = diaphragmatic hernia DZ = dizygotic EIF = electrically induced fatigue ETX = endotoxin FLAP = 5-LO-actvating protein GGEMG/Pepi = genioglossus electromyography/epiglottic pressure HASM = human airway smooth muscle cells IRL = inspiratory resistive load ITGV = intrathoracic gas volume JEM = job exposure matrix KO = knockout LAM = lymphangioleiomyomatosis LB = lymphocytic bronchiolitis MAP = mean arterial pressure MAP = mitogen-activated protein MAP = multivariate apnea prediction MIP = macrophage inflammatory protein MIP = maximum inspiratory pressure MPP = microorganisms with potential pathogenicity NTHi = non-typeable Haemophilus influenzae OI = orthostatic intolerance OI = oxygenation index OT = operating theater PATC = pulmonary antibiotic tissue concentration QWB = quality of well being ROFA = residual oily fly ash SLB = surgical lung biopsy TWG = total water gradient TST = tuberculin skin test TST = total sleep time UC = usual care UIP = usual interstitial pneumonia UIP = upper inflection point Vuip1 = volume of UIP UPPP = uvulopalatopharyngoplasty WG = weight gain Xrs5 = reactance at 5 Hz with impulse oscillation technique Yr6 = age 6 years Zds = impedance of compressible gas
There should be only one reason for researchers to publish a paper: to report new findings and allow others to build on them. But a report that is difficult to read defeats its primary purpose: communication. To reach the widest audience, researchers need to present their findings simply, clearly, and precisely, arrange their ideas in an orderly manner, and use logic as the glue holding the ideas together (1). Good writing is like a clean window, allowing the reader to see directly into the writer's mind (2). Too often, scientific prose is like ground glass, where the reader glimpses only a foggy outline of the content inside.
In this issue of the Journal (pp. 16071608), Farber (3) draws attention to the burden that abbreviations impose on readers. The reader must first decipher the writer's code before finding the science within the article. This task is frustrating, and it distracts the reader from concentrating on the science.
An abbreviation is usually made from the first letters (or first two letters) of successive words or important syllables. A casual glance over recent issues of the Journal will uncover abbreviations commencing with every letter of the alphabet: AGA (4), BLM (5), CR (6), DZ (7), EIF (8), FLAP (9), GGEMG/Pepi (10), HASM (11), ITGV (12), JEM (13), KO (14), LB (15), MPP (16), NTHi (17), OT (18), PATC (19), QWB (20), ROFA (21), SLB (22), TWG (23), UC (24), Vuip1 (25), WG (26), Xrs5 (27), Yr6 (28), and Zds (29). How many of these abbreviations do you instantly recognize? (Compare your guess with the authors' intent in the footnote.) Some abbreviations are identical yet have different intended meanings: MAP is used for mean arterial pressure (30), mitogen-activated protein (31), and multivariate apnea prediction (32). Other abbreviations with double meanings include CTL (33, 34), DH (35, 36), MIP (35, 37), OI (38, 39), TST (40, 41), and UIP (42, 43).
If a reader is already familiar with an abbreviation and the writer uses it skillfully, it can ease communication. It's acceptable to use an abbreviation to replace a long or cumbersome word (or phrase) that appears a great many times in a manuscript (44, 45). But allergic rhinitis is not sufficiently cumbersome to need AR. And nine times is not a great many. If an abbreviation appears only five or so times in a manuscript, the reader keeps hunting backward to find what it means. This is an unnecessary chore without any gain. If the author wishes to save space in the journal, there are far better ways of doing so without using abbreviations. A reader should not need a codebook or a glossary to read an article. A simple way of avoiding abbreviations is to use a substitute word. Instead of writing "IRL" for "inspiratory resistive load" (46), simply write "load" after first stating what type.
In our INSTRUCTION FOR CONTRIBUTORS (47) we instruct authors to minimize the use of abbreviations and to avoid them completely in the abstract. For authors who like guidelines in numbers, it is acceptable to substitute a standard abbreviation for an unwieldy word or phrase appearing more than 10 times in a manuscript (44, 45). An abbreviation should never replace 1 short word: do not use ETX for endotoxin (48) or AR for arousal (49), whereas LAM for lymphangioleiomyomatosis (50, 51) and UPPP for uvulopalatopharyngoplasty (52) are acceptable. New abbreviations should not be invented for 1 paper, and all abbreviation should be defined when first used. Readers can generally handle 2 or 3 abbreviations in a paper, but reading becomes exponentially more difficult with each additional abbreviation.
Noun clusters are another burden for readers. English is flexible and allows nouns to serve as adjectives. Using a noun modifier instead of a prepositional phrase enables more concise communication: lung function versus function of the lung. But trouble begins when you add another noun to an already existing noun pair. Nouns pile up, one modifying the next, and clarity is lost (45, 53, 54, 55). Examples include "rat heterotopic tracheal transplant model" (56), "bilateral anterior magnetic phrenic nerve stimulation" (57), "carotidfemoral pulsewave velocity" (58), "recombinant human soluble complement receptor type 1" (59), and "raised volume rapid thoracoabdominal compression technique" (60). When nouns are packed too close together, like sardines in a tin, the connecting thought gets suffocated. One or more prepositions can be used to disentangle a noun cluster, clarifying the relationship between one word and the next and improving precision. Take "cultured sheep pulmonary artery endothelial cells" (61). Instead of wondering how sheep become cultured, inserting a few prepositions makes the meaning clear: "cultures of endothelial cells from the pulmonary artery of sheep." The untangled version is longer than the original but the goal is clarity, not brevity.
Literary devices that exclude readers are self-defeating. Yet new terms, such as apoptosis (62) and restriction fragment length polymorphism (63), are needed to communicate fresh conceptions and new techniques in an accurate and succinct manner. Without precise technical terms, communication among specialists becomes awkward and time consuming (64). Some specialist terms, however, mask loose ideas and permit overconfident assertions that would never pass in a court of law. Arcane words may be used to impress the reader rather than to express an ideaa means to elevate the writer and magnify the gravity of the thought (65). "Men should use common words to say uncommon things, but they do the opposite," wrote Schopenhauer. The unnecessary use of obscure terminology constitutes a barrier between reading and understanding. Readers feel excluded, as if sitting on the fringe of a cozy conversation among members of an in-club. "Medical obscurity," points out Michael Crichton (66), "may serve an intragroup recognition function, rather like a secret fraternal handshake."
Pulmonary and critical care medicine is too young a field to fragment because of barriers to comprehension. Future growth depends on cross-fertilization. Intensivists reading the Journal should be able to learn the latest advances in the molecular biology of asthma, and asthma specialists should be able to learn the value of permissive hypercapnia when ventilating the asthmatic patient. Publications in pulmonary and critical care journals need to be inviting to readers from other medical subspecialties. Any devise that makes it difficult for a reader to understand an article threatens an essential characteristic of science: its openness to outside examination. The true scientist wants to make all the pertinent facts transparent to readers, enabling them to form their own opinions, and recoils at the thought of hiding information behind a curtain.
But clear prose poses one major risk: it shows up weak thinking for what it is.
REFERENCES
- Woodford FP. Sounder thinking through clearer writing: a graduate course on scientific writing can, if appropriately designed, strengthen scientific thinking. Science 1967;156:743745.[Abstract/Free Full Text]
- Orwell G. Why I write. In: A collection of essays. New York: Harvest Books; 1946. p. 309316.
- Farber HJ. On the abuse of acronyms. Am J Respir Crit Care Med 2002; 2002;166:16071608.
- Lum S, Hoo AF, Dezateux C, Goetz I, Wade A, DeRooy L, Costeloe K, Stocks J. The association between birthweight, sex, and airway function in infants of nonsmoking mothers. Am J Respir Crit Care Med 2001;164:20782084.[Abstract/Free Full Text]
- Yasui H, Gabazza EC, Tamaki S, Kobayashi T, Hataji O, Yuda H, Shimizu S, Suzuki K, Adachi Y, Taguchi O. Intratracheal administration of activated protein C inhibits bleomycin-induced lung fibrosis in the mouse. Am J Respir Crit Care Med 2001;163:16601668.[Abstract/Free Full Text]
- Mehta A, Qian J, Petocz P, Darendeliler MA, Cistulli PA. A randomized, controlled study of a mandibular advancement splint for obstructive sleep apnea. Am J Respir Crit Care Med 2001;163:14571461.[Abstract/Free Full Text]
- Carmelli D, Bliwise DL, Swan GE, Reed T. Genetic factors in self-reported snoring and excessive daytime sleepiness: a twin study. Am J Respir Crit Care Med 2001;164:949952.[Abstract/Free Full Text]
- Dousset E, Decherchi P, Grelot L, Jammes Y. Effects of chronic hypoxemia on the afferent nerve activities from skeletal muscle. Am J Respir Crit Care Med 2001;164:14761480.[Abstract/Free Full Text]
- Seymour ML, Rak S, Aberg D, Riise GC, Penrose JF, Kanaoka Y, Austen KF, Holgate ST, Sampson AP. Leukotriene and prostanoid pathway enzymes in bronchial biopsies of seasonal allergic asthmatics. Am J Respir Crit Care Med 2001;164:20512056.[Abstract/Free Full Text]
- Fogel RB, Malhotra A, Pillar G, Edwards JK, Beauregard J, Shea SA, White DP. Genioglossal activation in patients with obstructive sleep apnea versus control subjects: mechanisms of muscle control. Am J Respir Crit Care Med 2001;164:20252030.[Abstract/Free Full Text]
- Amrani Y, Moore PE, Hoffman R, Shore SA, Panettieri RA Jr. Interferon-
modulates cysteinyl leukotriene receptor-1 expression and function in human airway myocytes. Am J Respir Crit Care Med 2001;164:20982101.[Abstract/Free Full Text]
- Taube C, Holz O, Mucke M, Jorres RA, Magnussen H. Airway response to inhaled hypertonic saline in patients with moderate to severe chronic obstructive pulmonary disease. Am J Respir Crit Care Med 2001;164:18101815.[Abstract/Free Full Text]
- Basagana X, Sunyer J, Zock JP, Kogevinas M, Urrutia I, Maldonado JA, Almar E, Payo F, Anto JM. Incidence of asthma and its determinants among adults in Spain. Am J Respir Crit Care Med 2001;164:11331137.[Abstract/Free Full Text]
- Hoshikawa Y, Voelkel NF, Gesell TL, Moore MD, Morris KG, Alger LA, Narumiya S, Geraci MW. Prostacyclin receptor-dependent modulation of pulmonary vascular remodeling. Am J Respir Crit Care Med 2001;164:314318.[Abstract/Free Full Text]
- De Soyza A, Fisher AJ, Small T, Corris PA. Inhaled corticosteroids and the treatment of lymphocytic bronchiolitis following lung transplantation. Am J Respir Crit Care Med 2001;164:12091212.[Abstract/Free Full Text]
- Angrill J, Agusti C, De Celis R, Filella X, Rano A, Elena M, De La Bellacasa JP, Xaubet A, Torres A. Bronchial inflammation and colonization in patients with clinically stable bronchiectasis. Am J Respir Crit Care Med 2001;164:16281632.[Abstract/Free Full Text]
- Bandi V, Apicella MA, Mason E, Murphy TF, Siddiqi A, Atmar RL, Greenberg SB. Nontypeable Haemophilus influenzae in the lower respiratory tract of patients with chronic bronchitis. Am J Respir Crit Care Med 2001;164:21142119.[Abstract/Free Full Text]
- Harris ML, Luo YM, Watson AC, Rafferty GF, Polkey MI, Green M, Moxham J. Adductor pollicis twitch tension assessed by magnetic stimulation of the ulnar nerve. Am J Respir Crit Care Med 2000;162:240245.[Abstract/Free Full Text]
- Franz AR, Rohlke W, Franke RP, Ebsen M, Pohlandt F, Hummler HD. Pulmonary administration of perfluorodeca. Am J Respir Crit Care Med 2001;164:15951600.[Abstract/Free Full Text]
- Angus DC, Musthafa AA, Clermont G, Griffin MF, Linde-Zwirble WT, Dremsizov TT, Pinsky MR. Quality-adjusted survival in the first year after the acute respiratory distress syndrome. Am J Respir Crit Care Med 2001;163:13891394.[Abstract/Free Full Text]
- van Eeden SF, Tan WC, Suwa T, Mukae H, Terashima T, Fujii T, Qui D, Vincent R, Hogg JC. Cytokines involved in the systemic inflammatory response induced by exposure to particulate matter air pollutants (PM10). Am J Respir Crit Care Med 2001;164:826830.[Abstract/Free Full Text]
- Flaherty KR, Travis WD, Colby TV, Toews GB, Kazerooni EA, Gross BH, Jain A, Strawderman RL, Flint A, Lynch JP, et al. Histopathologic variability in usual and nonspecific interstitial pneumonias. Am J Respir Crit Care Med 2001;164:17221727.[Abstract/Free Full Text]
- Assanasen P, Baroody FM, Naureckas E, Solway J, Naclerio RM. The nasal passage of subjects with asthma has a decreased ability to warm and humidify inspired air. Am J Respir Crit Care Med 2001;164:16401646.[Abstract/Free Full Text]
- Kanner RE, Anthonisen NR, Connett JE. Lower respiratory illnesses promote FEV1 decline in current smokers but not exsmokers with mild chronic obstructive pulmonary disease: results from the lung health study. Am J Respir Crit Care Med 2001;164:358364.[Abstract/Free Full Text]
- Martin-Lefevre L, Ricard JD, Roupie E, Dreyfuss D, Saumon G. Significance of the changes in the respiratory system pressurevolume curve during acute lung injury in rats. Am J Respir Crit Care Med 2001;164:627632.[Abstract/Free Full Text]
- Broccard AF, Hotchkiss JR, Vannay C, Markert M, Sauty A, Feihl F, Schaller MD. Protective effects of hypercapnic acidosis on ventilator-induced lung injury. Am J Respir Crit Care Med 2001;164:802806.[Abstract/Free Full Text]
- Nielsen KG, Bisgaard H. Discriminative capacity of bronchodilator response measured with three different lung function techniques in asthmatic and healthy children aged 2 to 5 years. Am J Respir Crit Care Med 2001;164:554559.[Abstract/Free Full Text]
- Castro-Rodriguez JA, Holberg CJ, Morgan WJ, Wright AL, Martinez FD. Increased incidence of asthmalike symptoms in girls who become overweight or obese during the school years. Am J Respir Crit Care Med 2001;163:13441349.[Abstract/Free Full Text]
- Pillow JJ, Hall GL, Willet KE, Jobe AH, Hantos Z, Sly PD. Effects of gestation and antenatal steroid on airway and tissue mechanics in newborn lambs. Am J Respir Crit Care Med 2001;163:11581163.[Abstract/Free Full Text]
- Cohen RI, Hassell AM, Marzouk K, Marini C, Liu SF, Scharf SM. Renal effects of nitric oxide in endotoxemia. Am J Respir Crit Care Med 2001;164:18901895.[Abstract/Free Full Text]
- Hallsworth MP, Moir LM, Lai D, Hirst SJ. Inhibitors of mitogen-activated protein kinases differentially regulate eosinophil-activating cytokine release from human airway smooth muscle. Am J Respir Crit Care Med 2001;164:688697.[Abstract/Free Full Text]
- Gurubhagavatula I, Maislin G, Pack AI. An algorithm to stratify sleep apnea risk in a sleep disorders clinic population. Am J Respir Crit Care Med 2001;164:19041909.[Abstract/Free Full Text]
- Marchand E, De Leyn P, Gayan-Ramirez G, Palecek F, de Bock V, Dom R, Decramer M. Lung volume reduction surgery does not improve diaphragmatic contractile properties or atrophy in hamsters with elastase-induced emphysema. Am J Respir Crit Care Med 2000;162:10521057.[Abstract/Free Full Text]
- Kolb M, Inman M, Margetts PJ, Galt T, Gauldie J. Budesonide enhances repeated gene transfer and expression in the lung with adenoviral vectors. Am J Respir Crit Care Med 2001;164:866872.[Abstract/Free Full Text]
- O'Donnell DE, Revill SM, Webb KA. Dynamic hyperinflation and exercise intolerance in chronic obstructive pulmonary disease. Am J Respir Crit Care Med 2001;164:770777.[Abstract/Free Full Text]
- Thebaud B, Barlier-Mur AM, Chailley-Heu B, Henrion-Caude A, Tibboel D, Dinh-Xuan AT, Bourbon JR. Restoring effects of vitamin A on surfactant synthesis in nitrofen-induced congenital diaphragmatic hernia in rats. Am J Respir Crit Care Med 2001;164:10831089.[Abstract/Free Full Text]
- Liaudet L, Mabley JG, Soriano FG, Pacher P, Marton A, Hasko G, Szabo C. Inosine reduces systemic inflammation and improves survival in septic shock induced by cecal ligation and puncture. Am J Respir Crit Care Med 2001;164:12131220.[Abstract/Free Full Text]
- Guilleminault C, Faul JL, Stoohs R. Sleep-disordered breathing and hypotension. Am J Respir Crit Care Med 2001;164:12421247.[Abstract/Free Full Text]
- Kandler MA, von der Hardt, Schoof E, Dotsch J, Rascher W. Persistent improvement of gas exchange and lung mechanics by aerosolized perfluorocarbon. Am J Respir Crit Care Med 2001;164:3135.[Abstract/Free Full Text]
- Chee CB, Soh CH, Boudville IC, Chor SS, Wang YT. Interpretation of the tuberculin skin test in Mycobacterium bovis BCG-vaccinated Singaporean schoolchildren. Am J Respir Crit Care Med 2001;164:958961.[Abstract/Free Full Text]
- Hukins CA, Hillman DR. Daytime predictors of sleep hypoventilation in Duchenne muscular dystrophy. Am J Respir Crit Care Med 2000;161:166170.[Abstract/Free Full Text]
- King TE Jr, Schwarz MI, Brown K, Tooze JA, Colby TV, Waldron JA Jr, Flint A, Thurlbeck W, Cherniack RM. Idiopathic pulmonary fibrosis: relationship between histopathologic features and mortality. Am J Respir Crit Care Med 2001;164:10251032.[Abstract/Free Full Text]
- Takeuchi M, Sedeek KA, Schettino GP, Suchodolski K, Kacmarek RM. Peak pressure during volume history and pressurevolume curve measurement affects analysis. Am J Respir Crit Care Med 2001;164:12251230.[Abstract/Free Full Text]
- O'Connor M. The scientist as editor: guidelines for editors of books and journals. New York: John Wiley & Sons; 1979. p.6061.
- Zeiger M. Essentials of writing biomedical research papers. 2nd Edition. New York: McGraw-Hill; 2000. p. 3031, 273, 348349.
- Jiang TX, Reid WD, Road JD. Free radical scavengers and diaphragm injury following inspiratory resistive loading. Am J Respir Crit Care Med 2001;164:12881294.[Abstract/Free Full Text]
- Instruction for Contributors. http://www.thoracic.org/publications/ajrccm/bluecont2a.asp.
- Nakajima Y, Baudry N, Duranteau J, Vicaut E. Microcirculation in intestinal villi: a comparison between hemorrhagic and endotoxin shock. Am J Respir Crit Care Med 2001;164:15261530.[Abstract/Free Full Text]
- Black JE, Guilleminault C, Colrain IM, Carrillo O. Upper airway resistance syndrome. Central electroencephalographic power and changes in breathing effort. Am J Respir Crit Care Med 2000;162:406411.[Abstract/Free Full Text]
- Yu J, Astrinidis A, Henske EP. Chromosome 16 loss of heterozygosity in tuberous sclerosis and sporadic lymphangiomyomatosis. Am J Respir Crit Care Med 2001;164:15371540.[Abstract/Free Full Text]
- Taveira-DaSilva AM, Hedin C, Stylianou MP, Travis WD, Matsui K, Ferrans VJ, Moss J. Reversible airflow obstruction, proliferation of abnormal smooth muscle cells, and impairment of gas exchange as predictors of outcome in lymphangioleiomyomatosis. Am J Respir Crit Care Med 2001;164:10721076.[Abstract/Free Full Text]
- Lindberg E, Carter N, Gislason T, Janson C. Role of snoring and daytime sleepiness in occupational accidents. Am J Respir Crit Care Med 2001;164:20312035.[Abstract/Free Full Text]
- O'Connor M, Woodford FP. Writing scientific papers in english. Amsterdam: Elsevier; 1975. p. 4142.
- Baker JR. English style in scientific papers. Nature 1955;176:851852.[CrossRef][Medline]
- Barzun J. So long as doctors have to think. Bull N Y Acad Med 1971;47:229235.[Medline]
- Suga M, Maclean AA, Keshavjee S, Fischer S, Moreira JM, Liu M. RANTES plays an important role in the evolution of allograft transplant-induced fibrous airway obliteration. Am J Respir Crit Care Med 2000;162:19401948.[Abstract/Free Full Text]
- Series F, Straus C, Demoule A, Attali V, Arnulf I, Derenne JP, Similowski T. Assessment of upper airway dynamics in awake patients with sleep apnea using phrenic nerve stimulation. Am J Respir Crit Care Med 2000;162:795800.[Abstract/Free Full Text]
- Zureik M, Benetos A, Neukirch C, Courbon D, Bean K, Thomas F, Ducimetiere P. Reduced pulmonary function is associated with central arterial stiffness in men. Am J Respir Crit Care Med 2001;164:21812185.[Abstract/Free Full Text]
- Kallio EA, Lemstrom KB, Hayry PJ, Ryan US, Koskinen PK. Blockade of complement inhibits obliterative bronchiolitis in rat tracheal allografts. Am J Respir Crit Care Med 2000;161:13321339.[Abstract/Free Full Text]
- Modl M, Eber E, Weinhandl E, Gruber W, Zach MS. Assessment of bronchodilator responsiveness in infants with bronchiolitis: a comparison of the tidal and the raised volume rapid thoracoabdominal compression technique. Am J Respir Crit Care Med 2000;161:763768.[Abstract/Free Full Text]
- Erukhimov JA, Tang ZL, Johnson BA, Donahoe MP, Razzack JA, Gibson KF, Lee WM, Wasserloos KJ, Watkins SA, Pitt BR. Actin-containing sera from patients with adult respiratory distress syndrome are toxic to sheep pulmonary endothelial cells. Am J Respir Crit Care Med 2000;162:288294.[Abstract/Free Full Text]
- Cooper JA Jr, Ridgeway AL, Pearson J, Culbreth RR. Attenuation of interleukin 8-induced nasal inflammation by an inhibitor peptide. Am J Respir Crit Care Med 2001;163:11981205.[Abstract/Free Full Text]
- Caminero JA, Pena MJ, Campos-Herrero MI, Rodriguez JC, Garcia I, Cabrera P, Lafoz C, Samper S, Takiff H, Afonso O, et al. Epidemiological evidence of the spread of a Mycobacterium tuberculosis strain of the Beijing genotype on Gran Canaria Island. Am J Respir Crit Care Med 2001;164:11651170.[Abstract/Free Full Text]
- McAllister DT. Is there accepted scientific jargon? Science 1955;121:530532.[Free Full Text]
- Pickering G. Language: the lost tool of learning in medicine and science. Lancet 1961;2:115119.
- Crichton M. Medical obfuscation: structure and function. N Engl J Med 1975;293:12571259.[Medline]
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Copyright © 2002 American Thoracic Society
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