Английская Википедия:2002–2004 SARS outbreak among healthcare workers

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Файл:Sars Cases and Deaths.pdf
A map of SARS cases and deaths around the world regarding the global population, not just HCWs.

The rapid spread of severe acute respiratory syndrome (SARS) in healthcare workers (HCW)—most notably in Toronto, Ontario hospitals—during the global outbreak of SARS in 2002–2003 contributed to dozens of identified cases, some of them fatal.[1]

SARS is known to have arrived in Ontario on 23 February 2003 when an elderly woman returned to Toronto from Hong Kong. She died at home on 5 March, after infecting her son, who subsequently spread the disease to Scarborough Grace Hospital, dying on 13 March.[2]

Researchers have found several key reasons for this development, such as the high-risk performances of medical operations on patients with SARS, inadequate use of protective equipment, psychological effects on the workers in response to the stress of dealing with the outbreak, and lack of information and training on treating SARS.[3] Lessons learned from this outbreak among healthcare workers have contributed to newly developed treatment and prevention efforts and new recommendations from groups such as the Centers for Disease Control and Prevention (CDC).[4]

Background

SARS spread around the world from the Guangdong Province of China, to multiple locations, like Hong Kong and then Toronto, Canada from 2002 to 2003.[5] The spread of SARS originated from a doctor residing in a hotel in Hong Kong to other tourists staying in the same hotel, who then travelled back home to locations like Toronto (without knowing that they had the disease).[6] The growing number of cases in Toronto gave HCWs a significant challenge, as they were tasked with stopping the spread of the disease in their city. Unfortunately, this unprepared-for challenge led several hospitals in the city and in the surrounding Ontario region to see dozens of cases of SARS arise not only in typical patients but also in HCWs themselves.[7]

Noticing this development, on March 28, 2003, the POC (Provincial Operating Centre) in Ontario established a set of SARS-specific recommendations and suggestions for all hospitals in Toronto in order to guide them on how to best avoid the transmission of SARS among HCWs.[8] They hoped that these initiatives would protect HCWs from the disease, allowing them to continue treating other SARS-infected patients without putting themselves at risk.

A study published in 2006, however, suggests that these directives were not fully practiced and/or enforced, causing many HCWs to still get the disease.[9][10] The study followed 17 HCWs in Toronto hospitals who had developed the disease and interviewed 15 of them about their habits and practices during the time of the outbreak.[10] Specifically, the study involved asking the HCWs questions regarding the amount of training they had received on dealing with SARS cases in a cautionary way, how often they used protective equipment, etc.[10] In the end, results showed that the practices of these HCWs did not fully meet the recommendations set forth by the POC, providing greater evidence that these poor practices (described below) led to the development of the disease in HCWs more than anything else.[9]

Retrospect

In retrospect, according to infectious disease specialist Allison McGeer of the Sinai Health System, Ontario officials "clearly did enough right to control the outbreak".[11] Emergency measures included:[11]

  • premier Ernie Eves declared SARS a provincial emergency
  • overnight, all hospitals required to create units to care for SARS patients
  • Ontario activated its multi-ministry provincial operations centre for emergency response
  • all hospitals in the Greater Toronto Area and Simcoe County instructed to activate "Code Orange" emergency plans, which entailed suspending all non-essential services
  • visitor limitations imposed
  • isolation unit created for possible SARS patients
  • protective clothing mandates implemented for exposed staff
  • four days later, officials extended access restrictions to all hospitals in Ontario

As further determined in retrospect, some measures taken at the time were more extreme than necessary:[11]

  • imposition of quarantine on the presymptomatic exposed was excessive because "SARS is among the unusual infections that was not infectious before people got sick", although this was not certain knowledge at the time
  • extent of hospital closures and disruption to general care greater than necessary because of poor data collection on likely patterns of spread among hospitals

Broadly, the right measures were taken within the system, but insufficient training of HCWs lead to an implementation shortfall.

Causes of transmission

High-risk performance

Many HCWs became more susceptible to contracting the disease due to their operations and high-risk interactions with SARS patients.[10] Many of these interactions, such as caring for a patient directly or communicating with the patient, create high-risk scenarios in which the HCWs have many ways of becoming infected.[10] There are three main categories of High-Risk Performance: direct contact by patient, indirect contact by patient, and high-risk events.[10][12]

Direct contact by patient

Direct contact and resulting transmission of the disease "occurs when there is physical contact between an infected person and a susceptible person".[12] This direct contact can be various types of contact involving blood or bodily fluids,[12] but some SARS-specific examples include when a patient receives supplemental oxygen or mechanical ventilation with the aid of HCWs.[10] These require the direct contact of a patient with a HCW, making it a viable method of SARS transmission.[10] As direct contact is the most common form of high-risk performance, all seventeen HCWs participating in the study encountered some sort of direct contact with a patient in the 10 days before getting the disease.[10]

High-risk procedures

High-risk procedures include intentional actions that are taken by the HCW in order to help a patient.[10] They are considered high-risk because the chances of a disease being transmitted during these procedures are far greater than typical direct or indirect contact with a patient.[10] While there are myriad high-risk procedures, those that are SARS-specific include intubation, manual ventilation, nebulizer therapy, and several others.[10] As was highlighted in the study, fourteen of the seventeen HCWs taking part in the study were involved in some high-risk procedure in the 10 days before getting the disease.[10]

Indirect contact by patient

While direct contact involves the physical contact of two people, indirect contact does not.[12] Instead, indirect contact "occurs when there is no direct human-to-human contact," and it can involve contact of a human with a contaminated surface,[12] which are known as fomites.[13] The most plausible cases of transmission through indirect contact are when an HCW or healthy person touches a surface contaminated with droplets from an infected patient's sneeze or cough or inhales those droplets themselves.[14] At the same time, if the droplets come in contact with the healthy person's mouth, eye, or nose, the healthy person also risks becoming ill.[12] Other types of high-risk events include diarrhea and vomiting, which can very easily contaminate a HCW with bacteria or fluid that contains the SARS disease through indirect contact.[10] Regarding coming into contact with contaminated surfaces or fomites, many HCWs had habits of wearing jewelry, eating lunch on site or in designated cafeterias, wearing glasses, using makeup, etc., which are all potential new fomites that could foster the transmission of disease.[10] Just like with direct contact, all seventeen HCWs participating in the study encountered some type of high-risk event in the 10 days before getting the disease.[10]

Equipment inadequacy

One large guideline for HCWs in Toronto hospitals was the use of sufficient and protective equipment to avoid transmission of the disease.[9] The most widely suggested and used pieces of equipment were masks, gowns, gloves, and eye protection.[10] While these pieces of equipment were used by most HCWs, they were not always used—if at all—by everyone, allowing SARS transmission to take place more easily.[8]

Файл:Blossom 3 Ply Bacterial Filter Masks Elestic Earloop Face Mask Surgical Masks a.jpg
An example of typical surgical masks used by HCWs when interacting with patients.

Masks

Surgical masks were suggested to be used by both HCWs and patients. This is because the specifically recommended type of masks do a good job of preventing one's own bacteria and fluid from escaping into the air—keeping both a patient and a HCW's bacteria and fluid to themselves.[15] Less intentionally but also important, these masks discourage patients and HCWs from putting their fingers or hands in contact with the nose and mouth, which could usually allow bacteria to spread from the hand to these areas.[10] Contrary to popular belief, some types of masks do little to prevent fluid and bacteria from coming in contact with the wearer of the mask, but they can still help prevent airborne infection. Therefore, it is important that both the patient and the HCW wear the mask. However, the aforementioned study's results indicate that HCWs wore them much more often than the patients themselves; in fact, fourteen of the HCWS always wore their mask, while only 1 of the patients always wore his/her mask.[10]

Файл:Hospital protective clothing infections contagious diseases.jpg
An example of a hospital gown worn by HCWs and patients.

Gowns

Hospital gowns are another piece of equipment used by HCWs during the outbreak.[10] Used mostly for those who are having trouble changing/moving their lower body, gowns are easy for patients to put on when they are bedridden.[16] They are also helpful for HCWs to attempt to avoid contamination, as the gowns can be removed and disposed of easily after an operation or interaction with a patient.[17] While seemingly less critical than masks, gowns were worn nearly the same amount by HCWs as masks.[10]

Файл:Disposable nitrile glove.jpg
An example of typical disposable medical gloves worn often by HCWs

Gloves

Medical gloves, like masks and gowns, also serve the purpose of preventing contamination of disease by blocking contact between the hands and the various bacteria, fluid, and fomites that carry the disease.[18] HCWs can again, like gowns, easily dispose of and change gloves in order to help improve and maintain good sanitary conditions.[19] Compared to all of the other pieces of equipment, gloves were worn the most often by HCWs who contracted the disease.[10]

Файл:Eye-shield.jpg
A general type of eye-shield used by HCWs to prevent infection through the eyes.

Eye protection

HCWs used and continue to use a variety of eye protection, like personal and safety glasses, goggles, and face shields, but most relied on face shields and goggles when dealing with SARS patients.[8] In general, eye protection is most helpful in blocking any harmful particles (in this case bacteria or fluid from a patient) from entering the eye of a HCW. One distinction between eye protection and the other types of equipment, however, is that eye protection is often reusable. This characteristic of eye protection therefore makes understanding the methods used to clean the eye protection equipment a factor when assessing the success of using eye protection to prevent disease transmission.[10] These include how often the equipment is cleaned, what is used to clean the equipment, and the location of where the equipment is being cleaned.[10] While nearly all HCWs that contracted the disease reported that they wore some form of eye protection, many of them inadequately washed their eye equipment and did so in a SARS unit.[10]

Psychological effects

During outbreaks like the SARS outbreak in 2002–2003, HCWs are put under significantly greater amounts of stress and pressure to help cure patients and relieve them of disease.[20] Because there was no known cure for SARS, the pressure and stress was especially prominent among HCWs.[21] With this challenge came many psychological effects—most notably stress.

Stress was a psychological effect experienced by many HCWs during the outbreak.[20] This stress resulted from the fatigue and pressure of having to work longer hours and shifts in attempt to improve the treatment and the containment of the disease.[10] Meanwhile, many HCWs refrained from returning home in between shifts to avoid the possibility of transmitting the disease to family members or others in the community, which only exacerbated the emotional and physical stress and fatigue that the HCWs experienced.[10] Even more, the occupational stress of the HCWs only grew by dealing with sick and often dying patients. This stress has the capability to ease the transmission of the disease, which is a large reason for it being a cause of the disease in HCWs.[10] This is because, as HCWs become more stressed and tired, they compromise the strength of their immune system.[22] As a result, HCWs are more prone to actually getting the disease when they encounter certain causes of transmission, like the high-risk performance causes above.[22]

Lack of information

Lack of information about SARS

The outbreak of SARS involved significant amounts of uncertainty, as the specifics of the disease were unknown and treatment was not properly established at first.[9] More importantly, a cure did not (and still does not) exist, and HCWs and others involved originally knew little about how the disease was transmitted and from where it originated.[9] Due to this lack of information, partially coming from the Chinese government's unwillingness to share information on its patients, doctors were not quick to notice and diagnose the disease in its earliest stages, as they were still unsure about the disease's characteristics and origins.[23] These factors collectively allowed the disease to spread much quicker at first, infecting HCWs who knew little about the method of transmission of the disease. They were therefore unable to adequately protect themselves from the disease, and communication surrounding disease treatment and prevention was inhibited by their lack of knowledge.[9]

Inadequate training for HCWs

In addition to the POC's release of its set of SARS-specific directives in 2003, there was also training that was to be completed by HCWs planning to deal with and care for SARS patients.[10] This training included video sessions and other lessons equipping HCWs for safe interactions with SARS patients. Unfortunately, not all of this training was done—if at all—before HCWs began to interact with SARS patients.[8] Over a third of HCWs never received any type of formal training, and half of those receiving any formal training received it after they had begun to interact with and care for SARS patients.[10] At the same time, many of the HCWs receiving training received it from another HCW, allowing for the possibility of some error in the training.[10] Aside from this type of training, many HCWs complained that most efforts—which included only posting informational posters in the wards—were inadequate.[10]

Prevention and treatment in the future

After the large outbreak of SARS in 2002–2003, many doctors and organizations, such as the CDC, published a new set of recommendations and guidelines on preventing and dealing with possible outbreaks or cases of SARS in the future.[4] They “revised the draft based on comments received from public health partners, healthcare providers, and others” in November 2003 in order to improve prevention and treatment success throughout the world.[24] The document is divided into several sections, which include guidelines targeted specifically towards HCWs (e.g. “Preparedness and Response in Healthcare Facilities”) and other proactive measures directed towards whole communities (e.g. “Communication and Education” and “Managing International Travel-Related Transmission Risk”).[24] Furthermore, each section includes a subsection called “Lessons Learned,” where the CDC explains issues and failures in the topic during the past outbreak so that HCWs and others recognize mistakes and do not make them again.[24] The hope is that HCWs will be able to better prevent the transmission of the disease among themselves but also among others by now having the knowledge and guidelines needed to avoid all of the threats and causes explained above that enabled the transmission of the disease among HCWs from 2002 to 2003.[24]

Treatment

There is still no vaccine or cure for SARS, and antibiotics are ineffective for treating SARS because the disease is viral. As a result, the quarantine of infected patients is critical to prevent transmission, and using barrier nursing policies is also important to monitor patients in a safe and sanitary way.[25] Fortunately, various governments, health-focused non-profits, and research groups have been working with the CDC and other organizations to try and successfully find a cure for the disease.[26]

Prevention

Because there is no effective cure for SARS yet, types of prevention, including sanitary and cautionary methods (e.g. hand-washing and wearing a surgical mask) remain some of the best ways to prevent the spread of the disease. Even more, lessons learned from the 2002-2003 outbreak point out that greater knowledge about the disease and its methods of transmission, better and more effective training for HCWs, and potential stress-reducers for HCWs dealing with SARS patients, will all help prevent the disease from being transmitted to HCWs and others in the future.[10]

Further reading and external links

References

Шаблон:Reflist Шаблон:Authority control Шаблон:SARS

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  1. ↑ Шаблон:Cite journal
  2. ↑ Шаблон:Cite book
  3. ↑ Шаблон:Cite journal
  4. ↑ 4,0 4,1 Шаблон:Cite journal
  5. ↑ Шаблон:Cite journal
  6. ↑ Шаблон:Cite journal
  7. ↑ Шаблон:Cite web
  8. ↑ 8,0 8,1 8,2 8,3 Шаблон:Cite web
  9. ↑ 9,0 9,1 9,2 9,3 9,4 9,5 Шаблон:Cite news
  10. ↑ 10,00 10,01 10,02 10,03 10,04 10,05 10,06 10,07 10,08 10,09 10,10 10,11 10,12 10,13 10,14 10,15 10,16 10,17 10,18 10,19 10,20 10,21 10,22 10,23 10,24 10,25 10,26 10,27 10,28 10,29 10,30 10,31 10,32 Шаблон:Cite journal
  11. ↑ 11,0 11,1 11,2 Шаблон:Cite news
  12. ↑ 12,0 12,1 12,2 12,3 12,4 12,5 Шаблон:Cite web
  13. ↑ Шаблон:Cite web
  14. ↑ Шаблон:Cite web
  15. ↑ Шаблон:Cite news
  16. ↑ Шаблон:Cite book
  17. ↑ Шаблон:Cite news
  18. ↑ Шаблон:Cite web
  19. ↑ Шаблон:Cite web
  20. ↑ 20,0 20,1 Шаблон:Cite journal
  21. ↑ Шаблон:Cite web
  22. ↑ 22,0 22,1 Шаблон:Cite news
  23. ↑ Шаблон:Cite web
  24. ↑ 24,0 24,1 24,2 24,3 Шаблон:Cite web
  25. ↑ Шаблон:Cite web
  26. ↑ Шаблон:Cite journal
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