Upper respiratory tract infection

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Upper respiratory tract infection
File:Illu conducting passages.svg
Conducting passages.
Classification and external resources
Specialty Infectious disease
ICD-10 J00-06, J30-39
ICD-9-CM 465.9
Patient UK Upper respiratory tract infection
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Upper respiratory tract infections (URI or URTI) are illnesses caused by an acute infection which involves the upper respiratory tract including the nose, sinuses, pharynx or larynx. This commonly includes tonsillitis, pharyngitis, laryngitis, sinusitis, otitis media, and the common cold.[1]

Classification

  • Rhinitis - Inflammation of the nasal mucosa
  • Rhinosinusitis or sinusitis - Inflammation of the nose and paranasal sinuses, including frontal, ethmoid, maxillary, and sphenoid
  • Nasopharyngitis (rhinopharyngitis or the common cold) - Inflammation of the nares, pharynx, hypopharynx, uvula, and tonsils
  • Pharyngitis - Inflammation of the pharynx, hypopharynx, uvula, and tonsils
  • Epiglottitis (supraglottitis) - Inflammation of the superior portion of the larynx and supraglottic area
  • Laryngitis - Inflammation of the larynx
  • Laryngotracheitis - Inflammation of the larynx, trachea, and subglottic area
  • Tracheitis - Inflammation of the trachea and subglottic area

Signs and symptoms

Acute upper respiratory tract infections include rhinitis, pharyngitis/tonsillitis and laryngitis often referred to as a common cold, and their complications: sinusitis, ear infection and sometimes bronchitis (though bronchi are generally classified as part of the lower respiratory tract.) Symptoms of URTIs commonly include cough, sore throat, runny nose, nasal congestion, headache, low grade fever, facial pressure and sneezing. Onset of symptoms usually begins 1–3 days after exposure. The illness usually lasts 7–10 days.

Group A beta hemolytic streptococcal pharyngitis/tonsillitis (strep throat) typically presents with a sudden onset of sore throat, pain with swallowing and fever. Strep throat does not usually cause runny nose, voice changes, or cough.

Pain and pressure of the ear caused by a middle ear infection (otitis media) and the reddening of the eye caused by viral conjunctivitis are often associated with upper respiratory infections.

Cause

Over 200 different viruses have been isolated in patients with URIs. The most common virus is called the rhinovirus. Other viruses include the coronavirus, parainfluenza virus, adenovirus, enterovirus, and respiratory syncytial virus.[2]

Up to 15% of acute pharyngitis cases may be caused by bacteria, most commonly Streptococcus pyogenes a Group A streptococcus in Streptococcal pharyngitis ("Strep Throat").[3] Other bacterial causes are Streptococcus pneumoniae, Haemophilus influenzae, Corynebacterium diphtheriae, Bordetella pertussis, and Bacillus anthracis.

Diagnosis

URI, seasonal allergies, influenza: symptom comparison
Symptoms Allergy URI Influenza
Itchy, watery eyes Common Rare (conjunctivitis may occur with adenovirus) Soreness behind eyes, sometimes conjunctivitis
Nasal discharge Common Common Common
Nasal congestion Common Common Sometimes
Sneezing Very common Very common Sometimes
Sore throat Sometimes (postnasal drip) Very common Sometimes
Cough Sometimes Common (mild to moderate, hacking) Common (dry cough, can be severe)
Headache Uncommon Rare Common
Fever Never Rare in adults, possible in children Very common (100-102 °F (or higher in young children), lasting 3–4 days; may have chills)
Malaise Sometimes Sometimes Very common
Fatigue, weakness Sometimes Sometimes Very common, can last for weeks, extreme exhaustion early in course
Muscle pain Never Slight Very common, often severe

Prevention

Probiotics may be useful in preventing URTIs.[4] Vaccination may even help prevent URTIs, mostly against Influenza viruses, Adenoviruses, Measles, Rubella, Streptococcus pneumoniae, Haemophilus influenzae, Diphtheria, Bacillus anthracis, and Bordetella pertussis.

Treatment

Treatment depends on the underlying cause. There are currently no medications or herbal remedies that have been conclusively demonstrated to shorten the duration of the illness.[5] Treatment comprises symptomatic support usually via analgesics for headache, sore throat and muscle aches.[6]

Moderate exercise in sedentary subjects with naturally acquired URTI probably does not alter the overall severity and duration of the illness.[7] Mild sleep deprivation has been shown to be associated with increased susceptibility to infection.[8][9] No randomized trials have been conducted to ascertain benefits of increasing fluid intake.[10]

Antibiotics

Judicious use of antibiotics can decrease adverse effects of antibiotics as well as decrease costs. Decreased antibiotic usage will also prevent drug resistant bacteria, which is a growing problem in the world. Health authorities have been strongly encouraging physicians to decrease the prescribing of antibiotics to treat common upper respiratory tract infections because antibiotic usage does not significantly reduce recovery time for these viral illnesses.[11] Some have advocated a delayed antibiotic approach to treating URIs which seeks to reduce the consumption of antibiotics while attempting to maintain patient satisfaction. Most studies show no difference in improvement of symptoms between those treated with antibiotics right away and those with delayed prescriptions.[12] Most studies also show no difference in patient satisfaction, patient complications, symptoms between delayed and no antibiotics. A strategy of "no antibiotics" results in even less antibiotic use than a strategy of "delayed antibiotics". However, in certain higher risk patients with underlying lung disease, such as chronic obstructive pulmonary disease (COPD), evidence does exist to support the treatment of bronchitis with antibiotics to shorten the course of the illness and decrease treatment failure.[13]

Decongestants

According to a Cochrane review, single oral dose of nasal decongestant in the common cold is modestly effective for the short term relief of congestion in adults; however, "there is insufficient data on the use of decongestants in children." Therefore, decongestants are not recommended for use in children under 12 years of age with the common cold.[14] Oral decongestants are also contraindicated in patients with hypertension, coronary artery disease, and history of bleeding strokes.[15][16]

Alternative medicine

The use of vitamin C in the inhibition and treatment of upper respiratory infections has been suggested since the initial isolation of vitamin C in the 1930s. Some evidence exists to indicate that it could be justified in persons exposed to brief periods of severe physical exercise and/or cold environments.[17]

The use of nasal irrigation has been shown to alleviate symptoms in some people.[18] There are also saline nasal sprays which can be of benefit.

Epidemiology

Disability-adjusted life year for upper respiratory infections per 100,000 inhabitants in 2002.[19]
  no data
  less than 10
  10-30
  30-60
  60-90
  90-120
  120-150
  150-180
  180-210
  210-240
  240-270
  270-300
  more than 300

As of 2014, upper respiratory infections caused about 3,000 deaths down from 4,000 in 1990.[20] In the United States, URIs are the most common infectious illness in the general population. URIs are the leading reasons for people missing work and school. URI is the leading diagnosis in the office setting.[21]

See also

References

  1. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Viruses and Bacteria in the Etiology of the Common Cold Mika J. Mäkelä, Tuomo Puhakka, Olli Ruuskanen, Maija Leinonen, Pekka Saikku, Marko Kimpimäki, Soile Blomqvist, Timo Hyypiä, and Pertti Arstila J Clin Microbiol. 1998 February; 36(2): 539–542.
  3. ↑ Bisno, AL. Acute pharyngitis. N Engl J Med 2001; 344:205.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ ^ "Common Cold: Treatments and Drugs". Mayo Clinic. http://www.mayoclinic.com/health/common-cold/DS00056/DSECTION=treatments-and-drugs. Retrieved 9 January 2010.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ "Effects of sleep on the production of cytokines in humansPsychosomatic Medicine", Vol 57, Issue 2 97-104
  9. ↑ Behavioural Brain Research Volume 69, Issues 1-2, July–August 1995, Pages 43-54 The Function of Sleep
  10. ↑ BMJ. 2004;328:499-500
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  13. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  14. ↑ Spurling GKP, Del Mar C, Dooley L, Foxlee R. Delayed antibiotics for respiratory infections. Cochrane Database of Systematic Reviews 2007, Issue 3. Art. No.: CD004417. doi:10.1002/14651858.CD004417.pub3.
  15. ↑ Tietze KJ. Disorders related to cold and allergy. In: Berardi RR, ed. Handbook of Nonprescription Drugs. 14th ed. Washington, DC: American Pharmacists Association; 2004:239-269.
  16. ↑ Common cold. In: Covington TR, ed. Nonprescription Drug Therapy. St Louis, Mo: Facts & Comparisons; 2002:743-769.
  17. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  18. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  19. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  20. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  21. ↑ 1.Cherry DK, Hing E, Woodwell DA, Rechtsteiner EA. National Ambulatory Medical Care Survey: 2006 Summary. Hyattsville, MD: National Center for Health Statistics; 2008. National health statistics reports.

External links

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