Background
A surgical site infection (SSI) is an infection which happens within thirty days at the operative site if no graft is left in place or within ninety (90) days if an insert is left in place after the surgical operation. The surgical procedure determines the category of infection must appear [
1].
SSIs are the third common hospital acquired infection which accounts 38% of all nosocomial infections according to center for disease control (CDC’s) national nosocomial infection surveillance system [
2].
In countries with limited resources, SSI is the foremost infection in the overall patient population, affecting up to 66% of operated patients and nine times more than in industrialized countries [
3].
Increase hospital stays time, readmissions and additional use of antimicrobials which lead to antibiotic-resistant were seen by SSIs [
4].On average, SSIs increased postoperative hospital stay by 6.5 to 11 days and 3.57 additional drug uses [
2,
4]. SSI increased cost in England from $1,341-10,922 per patient, in Europe € 3,985/day and in the USA $25,546 per infection depending on surgery type and infection severity at institutional as well as national level [
5,
6].
Study indicated that nearly 40-60% of SSIs can be prevented with the appropriate use of surgical antimicrobial prophylaxis (AMP) [
7,
8]. Approximately 30-50% of antimicrobials used in hospitals are for surgical prophylaxis but 30 -90% of them are used inappropriately [
9,
10] which attribute for 16% of SSIs [
8].
Antimicrobials are a serious matter and resources are in short supply to prevent rise of resistance and limit the degree of this problem in developing countries. Although pathogens resistivity has increased, unfortunately, no new antimicrobials that can manage this resistance have been introduced and are not expected in the future [
11,
12]. World Health organization (WHO) described as resistance to antimicrobials has been a main threat to worldwide public health because there are few antimicrobials available to treat life-threatening infections in some cases [
13].
Unnecessary extra costs, potential promotion of microbial resistance selection and a precious resource wastage in health care occur due to inappropriate use of AMP. Studies presented that the cost of inappropriate AMP is approximately 10 times higher than the values expected [
14,
15].
Gram-positive cocci and gram-negative bacilli are major causative organisms of SSI as described by multi and single centered studies [
16,
17].
Due to inadequate SSI surveillance programs in many of sub-sahara Africa, healthcare centers are unable to get an update on bacteria which is resistant to the antimicrobial [
18]. In developing countries tests which would be used to isolate the organism and the correct antibiotic has limited accessibility and affordability [
19].
Periodic surveillance and feedback to surgeons on the rate of SSIs and factors significantly associated can reduce up to 50% of SSIs rate according to WHO and other studies [
5,
20].
Studies on rates of SSI, factors independently associated with SSI as well as on the causative agents and antibiotics susceptibility test are scarce in Ethiopia.
To our knowledge, studies focusing on SSI causing bacteria and their sensitivity pattern to antibiotics were not done in the study area.
Therefore, our study aimed to show the rate of SSI as well as factors associated with SSIs and characterize the susceptibility patterns of bacterial agents causing SSI at surgical ward department of WUNEMMH.
Methods
Study area
Conducted in surgical department of WUNEMMH which is government hospital.
Study design and period
A prospective cohort study in the surgical ward from January 1, 2017, to September 1, 2017, at WUNEMMH.
Study population
All patients who admitted for elective and emergency surgical procedures, and who fulfill eligibility criteria during the study period.
Sample size
Calculated using single population proportion formula with 훼 of 5% and proportion for SSI rate is 19.1 % [
21]. By considering 10% contingency, total sample size would be 280 patients.
Study procedures
Patients who were not willing to participate, receiving antimicrobial during admission or stopped receiving within 48 hours before operation and patients with initial diagnosis suggestive of infection were excluded. Written consent was obtained and interviewer administered semi-structured questionnaire was used for socio-demographic characteristics.
Socio-demographic and patient-related factors were collected from patient’s medical chart. Data on antimicrobials administration after operation and duration of administration were obtained from medication chart and direct observation.
Data were collected by three Nurses (BSc) using pretested data collection tool and the data collection was supervised daily by the research team.
Wound classification was done using Center for Disease Prevention and Control (CDC) criteria for surgical site infections surveillance and WUNEMMH surgeons were responsible for diagnosing surgical patients’ infection
Specimen collection procedures
Sterile swabs were used for collection of exudates from wounds of patients who develop SSI which transferred at room temperatures to the laboratory within 20 minutes. Chocolate, blood, and Mac-Conkey agar were used for inoculating swabs. We sited chocolate plate with other plates in a candle jam jar and keep warm at 35–37 °C for 24–48 hours. We report organisms by performing gram stain procedure on culture growth. An additional blood agar plate was inoculated anaerobically at 35–37 °C for 48–72 hours.
Sensitivity pattern of antibiotics
Disk diffusion test was performed for testing sensitivity [
22]. They were exposed to gentamicin, erythromycin, ceftriaxone, ciprofoxacillin, chloramphenicol (CAF), cloxacillin, ampicillin, and tetracycline. We did not test for methicillin resistant
Staphylococcus aureus (MRSA) and gram negatives which are extended-spectrum producers since this was not our study aim.
Statistical analysis
We used Epi-Data version 3.1 and analyzed using SPSS for window version 20.0. Frequency and percentages were used to describe socio-demographic, surgery-related factors, type of surgery and sensitivity of causative agents. Before running a multivariable binary logistic regression, multicollinearity between the independent variables was checked in linear regression by variance inflation factors (VIF). The model fitness for the variables was evaluated by the Hosmer-Lemeshow goodness of fit test. P-value of less than 0.05 was considered as independently associated in the multivariable analysis.
Discussion
Out of 255 patients who underwent surgical procedure, 42 patients developed SSIs which contribute to the overall rate of 16.5%. This was consistent with similar studies done in Ethiopia 19.1% [
21], Uganda 16.4% [
23] and Nigeria 20.3% [
24]. But, it is relatively less compared to study done in Tanzania 26% [
25]. This difference might be for the reason that our study included only wounds which are clean and clean-contaminated while other studies included contaminated and dirty wound. The finding was higher compared with studies done in USA 7.2% [
26] and Saudi Arabia 6.8 % [
27]. The difference might be due to modern surgical techniques, surgery rooms and sufficient trained professionals in developed countries.
Smoking contributes to the development of SSI by causing vasoconstriction which results in tissue hypoxia and hypovolemia locally as well as systemically which delays the healing progress, an environment conducive to SSI. In our study patients who smokes were 8.01 times more likely to develop SSIs compared with non-smokers with [ARR = 8.01 (95% CI (2.15-29.84), P= 0.002]. This study is in support of study done in Tanzania [
25].
Waiting time for surgery at hospital exposes the patients to contamination or colonization by pathogens which will contribute to the occurrence of SSI [
28]. Also patients with long stay in hospital before surgery were sicker or had higher comorbidities that increase their risk for SSI. Hospital stay more than 7 days preoperatively was likely to increase SSIs by risk of 2.48 times compared with preoperative hospital stay less than 7 days, [ARR = 2.48 (95% CI (1.28-4.79), P= 0.007]. Similar to our finding, study done in Egypt showed that patients who underwent operation within 2 days of admission decreased risk of SSI more than those whose operation done after 2 days (P= 0.0034) [
29]. This confirms that as the duration of hospital stay preoperatively gets shorten, it minimize rate of SSIs.
In our study, the rate of SSIs were 10.4% and 24.3% in the clean wound and in the clean-contaminated wound respectively. The finding was in contrast with study showed in Tanzania which indicated the rate as clean (63%) and clean-contaminated (33.7%) [
25]. As well as in study conducted in Egypt indicated that 57 % and 20% were clean and clean-contaminated wounds respectively [
29]. Similar findings have been documented in India where the rate of SSI was higher in clean-contaminated wound (22.8%) compared to wound which are clean (15.1%) [
28]. Also in study done in Sudan the rate of SSI was higher in clean contaminated (9.5%) relative to clean wound (8%) [
30]. The lesser rate of SSIs in clean wound in our study might be due to close precaution was taken to clean wound and might also be due to rational use of ceftriaxone for the most clean wound, which might result in sensitive strains in the clean wound as indicated [
31] and also our study confirms that ceftriaxone is highly sensitive to suspected organisms in clean wound.
The prolonged operation is an independent factor for SSIs in other study because of higher risk for infection due to incision of the operation site [
32]. It also increases the extent of tissue trauma due to an extensive surgical procedure, long duration of anesthesia effect, increased blood loss and also decrease surgical antimicrobial prophylaxis concentration at tissue level which all increases the risk of SSIs [
25,
28]. In our study, patients with duration of operation more than 1 hour were 2.13 times more likely to develop SSI compared to patients whose operation completed within 1 hour, [ARR = 2.13 (95%CI(1.18-3.86),P= 0.012] which was in line with other study [
33].
Administering AMP before 1 hour was observed to be an independent factor associated with SSIs in previous study [
34]. In this study, AMP administration before 1 hour increased SSIs risk by 5.05 times compared with administration of first dose of surgical antimicrobial prophylaxis within 1 hour of skin incision [ARR =5.05 (95% CI(1.79-14.21),P=0.002]. Antimicrobials concentration is not sufficient enough at the action site in tissue, as well as in serum to avoid the contamination during operation until wound closure if the first dose of antimicrobial was administered 1 hour earlier. One study indicated that low antibiotic concentration in tissue at the time of wound closure was an independent factor for the development of SSIs [
35].
Concerning to the causative agents, common cause of SSI were Klebsiella pneumoniae followed by Staphylococcus aureus, Escherichia colli and Pseudomonas aeruginosa. Most of the operations were caesarean section (CS) and appendectomy which were either clean or clean-contaminated. Our study suggested that the probable reason for the organisms to cause SSI was the spillage of this organism from the GIT. The aerobic-anaerobic organisms closely similar with the normal endogenous flora of the operated organ like clean-contaminated surgery of CS constitutes the most identified bacterial agents.
Gram-negative bacilli are the most common aerobic bacterial agents causing SSIs in CS patients and our finding showed that the predominant etiology was Klebsiella species.
The finding of our study is concordant with other studies done Nigeria, Uganda, Tanzania [
36‐
39] which showed that gastrointestinal tract (appendectomy) is a natural habitat for
Klebsiella pneumonia’s.
In our study resistance to antibiotics were from 11.1% for
Klebsiella to 100%
(Escherichia colli). A similar finding has been documented with other studies conducted in Mbarara, Mulago and Tanzania [
37‐
39].
In our study
Klebsiella pneumoniae has high sensitivity to both ciprofloxacin and ceftriaxone but was resistant to ampicillin, tetracycline, and erythromycin. In line with our study, study conducted in Kenya showed that
Klebsiella's resistant to ceftriaxone [
40] and resistance to chloramphenicol was also reported in Uganda [
41].
Our study showed that ciprofloxacin, ceftriaxone, cloxacillin, and gentamycin were sensitive to
Staphylococcus aureus, but were resistant to erythromycin, chloramphenicol, and ampicillin. This was in line with a study done in Uganda [
41]. The finding for ceftriaxone in our study is surprisingly indicated high sensitivity against both Gram-negative and Gram-positive organisms since the drug is frequently prescribed to almost all patients who underwent operation.
The result of this study will provide information for surgeons, working organizations like Non-governmental organizations (NGOs) in health care system of WUNEMMH as well as in national and international level to decrease the rate of SSI and related complications with SSIs.
Conclusion
The rate of SSIs was 16.5% which was lower compared with some developing countries and higher relative to reports from developed countries. Klebsiella pneumonia found to cause the majority of SSI. Ceftriaxone and ciprofloxacin were sensitive antibiotics.
Surgery waiting time more than 7 days, smokers, administrating antibiotic before 1 hour and operation time more than 1 hour were independently associated with SSIs.
Antimicrobial resistance is one of world problem, which results partly due to unnecessarily administration of antibiotic for long period so administration of surgical AMP for long time should be avoided.
It becomes imperative, therefore, to know local antibiotic sensitivity patterns existing in a hospital to plan appropriate antibiotic policy.
In addition, periodic surveillance on rate of SSI, associated factors of surgical site infection, causative agents, and their antimicrobial susceptibility will decrease the rate.
A surveillance system for SSI with feedback of proper data to surgeons and hospital authorities is highly recommended to reduce SSI rate in WUNEMMH.