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MRSA and Surveillance Cultures - Methacillin-resistant Staphylococcus aureus
 
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The role of Surveillance Cultures in the Prevention of
Methicillin-resistant Staphylococcus aureus in Acute Care Facilities


Updated Manuscript on MRSA Surveillance:
A Perspective on the Evidence Regarding Methicillin-resistant Staphylococcus aureus Surveillance. J Patient Saf. 2012 Aug 7. [Epub ahead of print]
PMID: 22874134 FREE ACCESS
http://journals.lww.com/journalpatientsafety/Fulltext/2012/09000/
A_Perspective_on_the_Evidence_Regarding.6.aspx
 

Authors:   Kevin T Kavanagh*
* Board Chairman Health Watch USA, Co-Editor & Publisher WAENT

Institution:  Health Watch USA

Corresponding Author: 

Kevin T Kavanagh, MD, MS, FACS
3396 Woodhaven Drive
Somerset, KY  40503

Abstract:

Methicillin-resistant Staphylococcus aureus (MRSA) is the most common hospital acquired infection causing approximately 17,000 patient deaths annually. Despite the disease reaching epidemic proportions in the United States a coordinated effort to address the problem has not been undertaken. Numerous studies have produced significant reduction in MRSA infections using a combination of interventions. Carrier identification using screening tests is key to allow environmental decontamination, identification of contacts and the prevention of over antibiotic usage along with the risks of fostering antibiotic resistance. Whether targeted or universal screening is adopted depends upon the carrier rate of MRSA in the general population. In the United States the carrier rate appears to be between 3% and 10% which places all individuals admitted to the hospital in a high-risk

 
Literature Review:

Over the past decade MRSA infections have become increasing more common1 and are one of the most dreaded hospital acquired conditions. MRSA is the most frequent cause of the over 1.7 million hospital acquired infections (HAI) which are estimated by the CDC to occur annually.2  In addition, each year HAI causes 99,000 deaths and costs the US economy approximately 35 to 45 billion dollars.3  Each HAI adds approximately 43,000 dollars to a patient’s medical bill.4 Hospital acquired MRSA has been estimated to cause 17,000 deaths annually.5  These infections should not be viewed as inevitable.  A paradigm shift in our thinking is needed as illustrated by a statement from Thomas R. Frieden, Director of the CDC, “Evidence indicates that, with focused efforts, these once formidable infections can be greatly reduced in number, leading to a new normal for healthcare-associated infections as rare, unacceptable events”.6

Various MRSA prevention protocols have been developed.  At some facilities, prevention is centered on universal precautions, with the treating of all patients the same.  The rational given for this, is a comparison to protocols used in the initial management of AIDS and the high prevalence of MRSA in the environment.

Comparison of the MRSA epidemic to that of AIDS is not valid because major differences exist.  In the AIDS epidemic, the recommendation to not screen and identify patients along with the use of universal precautions was made because initially there was no treatment available for the disease and there was significant discrimination in our society for those who were identified as having the affliction. AIDS, as compared to MRSA, was not nearly as contagious, with virtually no spread to the general public without intimate contact with the carrier.

A treatment for AIDS now exists and the Secretary of the Dept of HHS currently recommends that all persons between the ages of 13 and 64 be tested as part of their routine medical care.7  Although universal AIDS testing is recommended once in a lifetime, as opposed to every hospital admission, the MRSA conversion rate in the general population is much higher than that for AIDS.

Some healthcare facilities identify and focus in on high-risk groups. Barrier precautions are highly effective in preventing MRSA spread when used on high-risk patients.8  Surveillance testing that has been targeted on high risk populations and healthcare workers has also been shown to reduce the incidence of MRSA infection.9

However, data is emerging that in the US we are all high risk.  The rate of MRSA colonization in healthcare workers has been reported to be between 4% and 6.6% 10,11 and the incidence of MRSA positive patients admitted to an acute care hospital varies between 3% to 10%.  With reports of carrier rates of 3% in the US population over the age of Sixty12, 3.2% of patients admitted to an orthopedic trauma unit13, 3.6% of all patients admitted to a surgical ward14, 6.6% of patients admitted to a pediatric ICU15 and 10% of all patients admitted to the Lexington, KY Veterans Administration Hospital.16

Another approach is the use of surveillance testing on all patients admitted to a facility. For those with scheduled surgery, this should be done on an outpatient basis. Surveillance MRSA testing has been found to be cost effective17 with the rapid polymerase chain reaction (PCR) test costing a facility under $30 and a standard culture under $10.5.  MRSA screening can be used both on the patient and to aggressively identify community contacts for those that are found to be positive.  This latter approach was one of the key interventions that the country of Norway followed to bring their MRSA epidemic under control.  They tracked each individual case of MRSA and identified and tested the carrier’s contacts.18

The vast majority of research studies and reports have found that protocols which use universal MRSA screening of all admitted patients are effective in preventing MRSA infections.  Community-associated strains of MRSA (CA-MRSA) have become a major cause of hospital acquired infections.19  The CA-MRSA strains are adding to the overall presence of MRSA in the hospitals and outpatients coming into the hospital are fast becoming a significant reservoir for HAIs. Other studies which support universal screening for MRSA are listed below:

2007 Feb: The Pittsburg Veterans Administration Hospital reported a 70% decrease of MRSA using universal surveillance testing, contact precautions and increased hand hygiene.4

2008 Mar: A large study from Northwest University20 which Pol found that universal surveillance for MRSA on all admitted patients was associated with a large reduction in MRSA infections. Total MRSA infections in the three studied facilities decreased by 69.6% with universal surveillance.

2009 Feb: Shukla, et al.,13 found that the MRSA carrier state produced an increased risk of surgical site infections (8.8% of positive patients).  That identification of these patients allowed the preoperative use of glycopeptide antibiotics and increased vigilance for wound infection post-operatively.

2009 Feb: Dr. Walter Pofahl reported that MRSA preoperative screening resulted in a significantly decreased infection rate in patients who underwent orthopedic surgery.21

2010 May: Data from the National US Veterans Administration’s MRSA Reduction Initiative became available though a Congressional inquiry.22  Using an intervention “Bundle” which included universal surveillance testing, contact precautions, and increased hand hygiene, MRSA infection rates at the nation’s VA Hospitals fell 76% in the ICU (from 1.62/1,000 bed days of care to 0.39/1,000 bed days) and 28% in non-ICU patients (from 0.46/1,000 bed days of care to 0.33/1,000 bed days of care).

Despite the demonstration of significant reduction of surgical MRSA infections with protocols that use universal surveillance testing, there is resistance in the medical community on adopting this intervention.  Many cite the work of Dr. Stephan Harbarth.  In 2006, Harbarth, et al., reported that rapid screening and pre-emptive contact isolation substantially reduced MRSA cross-infections in the medical but not the surgical ICU.23

In 2008, Harbarth, et al., reported a widely publicized study showing that universal surveillance testing did not “reduce nosocomial MRSA infection in a surgical department...”.24  Of the 386 detected MRSA carriers who underwent surgery, 120 were emergency operations and culture results were not present before surgery. "Especially in abdominal surgery, surgeons were reluctant to add vancomycin to the standard prophylactic regimen."  In the remaining 266 patients who were culture positive 151 patients did not receive prophylaxis effective against MRSA. The study did find that no patients developed a MRSA infection “who were found to be MRSA positive during their outpatient visit and received adequate prophylaxis and decolonization.”  In addition, the study reported that 693 (6.4%) in the intervention group were MRSA carriers (previously known group and the detected with screening group) and that these patients made up 43% of all MRSA infections (p < 0.0001 chi square).

It is not enough to just identify patients, effective intervention must then be implemented. For elective admissions, MRSA surveillance testing should be performed on an outpatient basis since MRSA is highly infectious and by the time screening results are obtained as high as 45% of patients may have contaminated their environment.25  Hardy, et al.,14 reported a 3.6% carrier rate in admitted patients to a surgical ward and another 2.2% acquired MRSA after admission. Positive patients were treated with isolation and decolonization.  Rapid Screening (PCR) for MRSA was found to be more effective than the culture method in the prevention of MRSA acquisition. Thus, patients need to be identified as quickly as possible and once identified, the environment of the patient, whether in the hospital or at home, needs to be decontaminated and contacts dealt with appropriately.

Identifying and treating only those who have MRSA is also important in the prevention of bacterial antibiotic resistance. Another one of Norway’s interventions in the prevention of antibiotic resistance was the limitation of antibiotic usage.18 Institutions who routinely treat all of their patients’ naris with Mupirocin (Bactoban) are at risk of developing resistant strainsto this antibiotic that are being reported in the literature.26,27

The use of pre-operative antibiotics on all patients undergoing surgery is performed in some institutions to lower post-operative infection rates. However, implementation of this protocol comes at a risk of producing bacterial resistance; an example of short term good results for long-term poor ones. Super resistant strains such as USA600 are being reported which have a mortality rate for bloodstream infections of 60%.28 The high mortality rate has been attributed to Vancomycin tolerance with MRSA strains having the hVISA phenotype.29 

In the field of Otolaryngology, MRSA has been responsible for infections in a wide range of areas in the head and neck.  The most common infection is in the otologic region, followed by oralpharyngal/neck and finally nose and sinus.30  Forty-two percent of deep neck space infections in young children have been reported to be caused by MRSA.31   Twenty-three percent of orbital abscess were positive for MRSA.32   In pediatric patients, MRSA has been reported to be present in 21.6% of head and neck infections.33  A high frequency of Coagulase Negative Staphococcus and MRSA is found in post myringotomy tube insertion middle ear infections.34   At least one study, which dealt with septorhinoplasty, recommended the screening of patients at high risk for MRSA colonization, and that patients who screened positive should be decolonized prior to surgery.35   One can easily argue that if the MRSA colonization rate is high in the community that universal screening should be undertaken.  For elective surgery, a standard culture can be performed during the preoperative testing process.    

Prophylactic antibiotics should not be given to all patients but reserved for those who are immunocompromised or undergoing surgeries that have an increased or significant risk of infection. For example, for outpatient surgery performed in the head and neck region only open jaw fractures and diverticulectomy of the hypopharynx or esophagus are included in CMS’s quality measures on pre-operative antibiotic usage.36 Unless an active infection is discovered at the time of surgery, prophylactic antibiotics should be promptly discontinued after surgery.  However, all surgical patients should be washed with an antiseptic, such as topical chlorhexidine (Hibiclens), at least 24 hours before surgery and preferably for three days.

Conclusion: 

Despite abundant evidence which can be used to chart a successful course in addressing the MRSA epidemic, the United State healthcare system lacks uniform national guidelines for controlling the spread of MRSA. The CDC has been criticized by the OIG in finding that the CDC has “almost 1200 recommended practices, but activities across HHS to promote implementation of these practices are not guided by a prioritization of the practices.” 37  

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8. Safdar N, Marx J, Meyer NA, Maki DG. Effectiveness of preemptive barrier precautions in controlling nosocomial colonization and infection by methicillin-resistant Staphylococcus aureus in a burn unit. Am J Infect Control. 2006 Oct;34(8):476-83. PMID: 17015152 http://www.ncbi.nlm.nih.gov/pubmed/17015152

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11. Emma Hitt, PhD MRSA Found in 4% of Healthcare Workers; Most Are Healthcare-Related Strains Medscape Medical News April 6,2010 http://www.medscape.com/viewarticle/719841

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14. Hardy K, Price C, Szczepura A, Gossain S, Davies R, Stallard N, Shabir S, McMurray C, Bradbury A, Hawkey PM. Reduction in the rate of methicillin-resistant Staphylococcus aureus acquisition in surgical wards by rapid screening for colonization: a prospective, cross-over study. in Microbiol Infect. 2010 Apr;16(4):333-9. Epub 2009 Jul 20. PMID: 19622077   http://www.ncbi.nlm.nih.gov/pubmed/19622077 

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20. Robicsek A, Beaumont JL, Paule SM, Hacek DM, Thomson RB Jr, Kaul KL, King P, Peterson LR. Universal surveillance for methicillin-resistant Staphylococcus aureus in 3 affiliated hospitals. Ann Intern Med. 2008 Mar 18;148(6):409-18. PMID: 18347349. http://www.ncbi.nlm.nih.gov/sites/entrez/18347349 

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