| |
Antibiotics are not always the cure
When patients with infection symptoms go to see their
doctor, they often expect a prescription for antibiotics.
Many infections, however, are of viral origin. In viral
illnesses antibiotics are not only ineffective but also
contribute to the development of antibiotic resistance,
which is an increasing and serious public health problem.
An easy-to-use diagnostic test that assists you to
differentiate between bacterial and viral infections and
provides an analytically accurate and immediate result
during the patient�s visit can effectively guide you on
appropriate antibiotic use.
Diagnostic dilemma
Primary health care professionals are often confronted with
the question whether a patient�s symptoms are related to a
bacterial infection or a viral infection, and whether the
patient really needs antibiotics or not.
The dilemma of distinguishing between bacterial and viral
infections together with the lack of diagnostic tools,
patient pressure and time constraints,1-5 may lead to an
unnecessary antibiotic prescription. About 80-90% of
antibiotics are prescribed in primary care, and up to 80% of
these are used to treat acute respiratory
tract infections.6-9 It is estimated that 50% of all
antibiotic prescriptions in primary care are unnecessary.6-9
Although most acute respiratory tract infections are caused
by viruses and although antibiotics offer at best a modest
benefit, 10 they are frequently used to treat these
conditions.11 Inappropriate and excessive use of antibiotics
is acknowledged as a main cause of antibiotic
resistance.4,12,13
The lack of diagnostic tools makes it difficult for the
prescriber to have the right arguments to convince the
patient and himself that antibiotics are not needed in the
individual case1
Antibiotic resistance and primary care
Antibiotic resistance is one of the most serious public
health problems12,14,15 and increasing at an alarming rate
in primary care settings, too, making daily treatment
decisions more challenging.16
Facts about antibiotic resistance
- many previously effective antibiotics are now ineffective14,16,17
- new bacterial strains have emerged that are resistant to several antibiotics at the same time16,17
- excessive use of broad-spectrum antibiotics is also driving up resistance problems6,18,19
- antibiotic resistance is causing a heavy cost on the society.21
The use of antibiotics in primary care varies considerably
between countries, which is unlikely to be caused by
differences in frequency of bacterial infections.20 A
correlation between a high use of antibiotics and higher
rate of antibiotic resistance has been observed.13,15
Nations worldwide have developed strategies to fight
antibiotic resistance and to keep those antibiotics working
which are still effective.12,14,21 Containment of
inappropriate and excessive antibiotic use
may contribute to slowing down or even reversing the
development of antibiotic resistance.22,23
The WHO claims that inadequate access to appropriate
nearpatient
diagnostic tools can also be a driving factor for
prescribing antibiotics when not clearly indicated.12 A
diagnostic tool providing an objective and immediate test
result that confirms or rules out viral infection could have
an important role in reducing inappropriate use of
antibiotics.
Overuse of antibiotics is jeopardizing the usefulness of
essential drugs. Decreasing inappropriate antibiotic use is
the best way to control resistance14
C-reactive protein
Measurement of C-reactive protein (CRP) is helpful in the
clinical management of a patient with symptoms of an
infection.
back to the top
Specific features of CRP
- normally present in very low concentrations in the
blood of healthy people; 99% have levels of <10 mg/l24
- uncomplicated viral infections mostly induce (with some
exceptions) a very modest elevation or none at all24
- in bacterial infections, concentrations increase
markedly24
- elevated concentrations can be detected within 6-12 h
after onset of an inflammatory stimulus, reaching maximum
within 24-48 h25,26
- rise in concentrations corresponds to severity of
infection24
- concentrations fall rapidly when the patient responds
to antibiotic treatment24
- normalisation of the concentration may indicate that
the duration of treatment has been sufficient and the
treatment can be discontinued.24,27,28
CRP and infection
When evaluated in the light of the patient’s clinical
condition, measurement of CRP can assist in differentiating
between bacterial infections and viral infections and in
rationalising antibiotic therapy. Measurement of CRP has
long been used as a routine diagnostic test in laboratories.
However, obtaining the CRP result from an external
laboratory takes too long for adequate support of the
diagnostic decision in a primary care setting where the
health care professional requires the test result
immediately during the patient visit.
- CRP can be used as a predictor for bacterial infection
due to the inflammation that occurs when there is bacterial
infection present
- Uncomplicated viral infections mostly induce a very
modest elevation or none at all
- In bacterial infections, concentrations increase
markedly
- Concentrations fall rapidly when the patient responds
to antibiotic treatment
- Normalization of the concentration may indicate that
the duration of treatment has been sufficient and the
treatment can be discontinued
Serial CRP
- In the ICU, CRP is useful in determining the efficacy
of antibiotic therapy
- By checking CRP regularily it may be possible to see
whether or not the current antibiotic therapy effective
Antibiotic resistance and primary care
Antibiotic
resistance is one of the most serious public health
problems12,14,15 and increasing at an alarming rate in
primary care settings, too, making daily treatment decisions
more challenging.16
Facts about antibiotic resistance
- many previously effective antibiotics are now
ineffective14,16,17
- new bacterial strains have emerged that are resistant
to several antibiotics at the same time16,17
- excessive use of broad-spectrum antibiotics is also
driving up resistance problems6,18,19
- antibiotic resistance is causing a heavy cost on the
society.21
The use of antibiotics in primary care varies
considerably between countries, which is unlikely to be
caused by differences in frequency of bacterial
infections.20 A correlation between a high use of
antibiotics and higher rate of antibiotic resistance has
been observed.13,15 Nations worldwide have developed
strategies to fight antibiotic resistance and to keep those
antibiotics working which are still effective.12,14,21
Containment of inappropriate and excessive antibiotic use
may contribute to slowing down or even reversing the
development of antibiotic resistance.22,23
The WHO claims
that inadequate access to appropriate nearpatient diagnostic
tools can also be a driving factor for prescribing
antibiotics when not clearly indicated.12 A diagnostic tool
providing an objective and immediate test result that
confirms or rules out viral infection could have an
important role in reducing inappropriate use of antibiotics.
Overuse of antibiotics is jeopardizing the usefulness of
essential drugs. Decreasing inappropriate antibiotic use is
the best way to control resistance14
C-reactive protein
Measurement of C-reactive protein (CRP) is helpful in the
clinical management of a patient with symptoms of an
infection.
CRP and Inflammatory Disorders
- CRP is a useful inflammatory marker used to monitor the
disease progress or response to treatment in patients
with chronic inflammatory disorders such as rheumatoid
arthritis or Chrons Disease
- When the disease is active it becomes elevated and when
disease is in remission it returns to normal
QuikRead CRP shows good concordance with standard
laboratory methods and may lead to a more rational approach to patients with respiratory infections29 The
QuikRead CRP offers an excellent cost effective tool to
augment clinical judgement whilst facilitating optimal time
management in the ICU or private practise
back to the top
References
- Nordberg P et al. Consumers and Providers – could they
make better use of antibiotics? The Global Threat of
Antibiotic Resistance: Exploring Roads towards Concerted
Action. A multidisciplinary meeting at the Dag Hammarskjöld
Foundation, Uppsala, Sweden, 5-7 May 2004. Background
material. Available at .
- Pichichero ME. Understanding Antibiotic Overuse for
Respiratory Tract infections in Children. Pediatrics 1999;
104: 1384-1388.
- Pétursson P. Why Non-Pharmacological Prescribing of
Antibiotics? – A Phenomenological Investigation into the
Rationale behind it from the GP’s perspective. Master of
Public Health Essay (Nordic School of Public Health). MPH
2005: 6.
- Avorn MD, Solomon DG. Cultural and Economic Factors That
(Mis)Shape Antibiotic Use: The Nonpharmacologic Basis of
Therapeutics. Ann Intern Med 2000;133:128-135.
- Arnold SR & Strauss SE, Interventions to improve
antibiotic prescribing practices
in ambulatory care. The Cochrane Database of Systematic
Reviews 2005, Issue 4. Art No.: CD003539.pub2.
- Wise R et al. Antimicrobial resistance is a major threat
to public health. BMJ 1998;317:609-10.
- Mölstad S. Reduction in antibiotic prescribing for
respiratory tract infections is needed! Scand J Prim Health
Care 2003;21:196-8.
- Huovinen P, Cars O. Control of antimicrobial resistance:
time for action. The essentials of control are already well
known. BMJ 1998; 317: 613-4.
- Kuyvenhoven MM et al. Outpatient antibiotic prescriptions
from 1992 to 2001in The Netherlands. JAC 2003;52:675-678.
- Arroll B, Kenealy T. Antibiotics for the common cold and
acute purulent rhinitis. The Cochrane Database of Systematic
Reviews 2005, Issue 3. Art. No.: CD000247.pub2.
- Watson Rl et al. Antimicrobial Use for Pediatric Upper
Respiratory Infections: Reported Practice, Actual Practice,
and Parent Beliefs. Pediatrics 1999; 104: 1251-7.
- World Health Organization. WHO Global Strategy for
Containment of Antimicrobial Resistance. Available at .
Accessed on 19 April 2006.
- Bonzwaer SLAM et al. A European Study on the
Relationship between
Antimicrobial Use and Antimicrobial Resistance. Emerg Inf
Dis 2002; 8(3): 278-282.
- Centers for Disease Control and Prevention (CDC). CDC
antimicrobial resistance campaigns: Campaign for Appropriate
Antibiotic Use in the Community. Available at. Accessed on
19 April 2006.
- Goossens H et al. Outpatient antibiotic use in Europe
and association with resistance: a cross-national database
study. Lancet 2005; 365: 579- 87.
- Hooton TM, Levy SB. Antimicrobial Resistance: A Plan of
Action for Community Practice. Am Fam Physician 2001; 63(6):
1087-1096.
- European Commission. Antibiotic resistance. A growing
threat. Prudent use of antibiotics is vital. Available at .
Accessed on 19 April 2006.
- Steinman MA et al. Predictors of Broad-Spectrum
Antibiotic Prescribing for Acute Respiratory Tract
Infections in Adult Primary Care. JAMA 2003; 289: 719-725.
- Hyde TB et al. Macrolide Resistance Among Invasive
Streptococcus pneumoniae
Isolates. JAMA 2001; 286: 1857-1862.
- Cars O, et al Variation in antibiotic use in the
European Union. The Lancet 2001; 375: 1851-1853.
- The Council of European Union. Council Recommendation of
15 November 2001 on the prudent use of antimicrobial agents
in human medicine. (2202/77/EC). Official Journal of the
European Communities. Available at . Accessed on 19 April
2006.
- Seppälä H et al. The effect of the consumption of
macrolide antibiotics on erythromycin resistance in group A
streptococci in Finland. N Engl J Med 1997; 337: 441-6.
- Stephenson J. Icelandic researchers are showing the way
to bring down rates of antibiotic-resistant bacteria. JAMA
1996; 275: 175.
- Pepys MB. The acute phase response and C-reactive
protein. In: Warrell DA, Coz TM, Firth JD, Benz EJ, eds.
Oxford Textbook of Medicine, 4th ed. Oxford University
Press, 2003. Vol 2, p. 150-156.
- Bjerrum L. C-reactive protein measurement in general
practice may lead to lower antibiotic prescribing for
sinusitis. Br J Gen Pract 2004; 54: 659-662.
- Pepys MB. C-reactive protein fifty years on. Lancet
1981; 1: 653-657.
- Philip AGS, Mills PC. Use of C-reactive Protein in
Minimizing Antibiotic Exposure: Experience With Infants
Initially Admitted to a Well- Baby Nursery. Pediarics 2000;
106.
- Ehl S et al. C-reactive Protein Is a Useful Marker for
Guiding Duration of Antibiotic Therapy in Suspected Neonatal
Bacterial Infection. Pediarics 1997; 99: 216-221.
- Esposito S et al. Evaluation of a rapid beside test for
the quantitative determination of C-reactive protein. Clin
Chem Lab Med 2005; 43(4): 438-440.
- Seamark DA et al. Field-testing and validation in a
primary care setting
of a point-of-care test for C-reactive protein. Ann Clin
Biochem 2003; 40: 178-80.
- Paloheimo L et al. A Fast B-CRP Assay for Near-Patient
Testing (NPT) or Point-of-Care Testing (POCT). Poster
presented at Laboratory Medicine 2000/XXVII Nordic Congress
of Clinical Chemistry, Bergen, Norway 4-8 June 2000.
back to the top
|