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SAMJ: South African Medical Journal

versión On-line ISSN 2078-5135
versión impresa ISSN 0256-9574

SAMJ, S. Afr. med. j. vol.103 no.10 Cape Town ene. 2013

 

RESEARCH

 

Quantifying the disparity in outcome between urban and rural patients with acute appendicitis in South Africa

 

 

V Y KongI; S van de LindeII; C AldousIII; J J HandleyIV; D L ClarkeI

IDepartment of Surgery, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
IIDepartment of Public Health, Programme for Bioethics and Biostatistics, College of Heath Sciences, University of KwaZulu-Natal, Duban, South Africa
IIISchool of Clinical Medicine, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
IVDepartment of Anaesthetics and Critical Care, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa

Correspondence

 

 


ABSTRACT

BACKGROUND: Acute appendicitis in South Africa is associated with higher morbidity than in the developed world.
OBJECTIVE: To compare outcomes of urban and rural patients in KwaZulu-Natal and to determine whether there are disparities in outcome.
METHODS: We conducted a prospective study from September 2010 to September 2012 at Edendale Hospital in Pietermaritzburg, South Africa. All patients who presented with acute appendicitis were included. The operative and clinical course of urban and rural patients was compared.
RESULTS: A total of 500 patients were included, with 200 patients in the rural group and 300 in the urban group. Those from the rural group had a significantly longer duration of symptoms prior to presentation. All septic parameters were significantly worse in the rural group. Significantly more patients from the rural group required a laparotomy (77% v. 51% urban; p<0.001). Inflamed, non-perforated appendicitis was more commonly seen in the urban group (52.3% v. 21% rural; p<0.001), while perforated appendicitis was much more common in the rural group (79% v. 47.7% urban; p<0.001). Perforation associated with generalised, four-quadrant intra-abdominal contamination was significantly higher in the rural group than the urban group (60.5% v. 21%, respectively; p<0.05). Significantly more patients from the rural group required an open abdomen (46% v. 12% urban; p<0.001) and
1 re-laparotomies to control severe intra-abdominal sepsis (60.5% v. 23.3% urban; p<0.001).
CONCLUSION: We have identified rural origin as an independent indicator of poor outcome. Possible reasons may include difficulty in accessing the health system or delay in transfer to a regional hospital. These need to be investigated further.


 

 

There are significant disparities in access to surgical care across countries in the world, as well as between regions within countries and between groups of patients.[1] These disparities in access to care often translate into differences in outcome.[2] We have previously published our experience with acute appendicitis in South Africa (SA) and have shown that there are significant delays in accessing care with an associated perforation rate of 54%.[3] This is in keeping with other SA audits, which report similar rates ranging from 43% to 51%.[4] The equivalent perforation rate in the developed world is less than half of that in SA.[3]

 

Objective

To determine whether disparities in outcome between SA and the developed world were reflected in both urban- and rural-based patients in SA.

 

Methods

We conducted a prospective study from September 2010 to September 2012 at Edendale Hospital in Pietermaritzburg, KwaZulu-Natal (KZN). Edendale Hospital drains 2 health districts, namely the rural Sisonke District and the urban uMgungundlovu District. Patients who presented from uMgungundlovu District were classified as urban-based patients. Those who presented from 1 of the 4 rural hospitals in Sisonke District were classified as rural-based patients. All patients who presented with a clinical diagnosis and intraoperative confirmation of acute appendicitis were included. Assessment of the diagnosis was made on purely clinical grounds; advance imaging was not utilised. All patients with an alternative intraoperative diagnosis were excluded. Basic demographic data were collected. Each patient was specifically asked about his/her health-seeking behaviour, including the duration of symptoms prior to contact with the healthcare system. Clinical symptoms, physical examination findings, baseline vital signs and results of laboratory tests were recorded. Details of operative findings were obtained from the operative records. The clinical course of each patient to discharge (or death) was followed. Admission to the intensive care unit (ICU), the need for 're-look' laparotomy, major complications and death were recorded. Patients in the rural-based group were then compared with the urban-based cohort.

Ethics approval was obtained from the uMgungundlovu Health Review Board.

Statistical analysis

The Pearson χ2 test was used when the sample size assumption was adhered to. Fischer's exact test was utilised in cases where the χ2 assumption was not fulfilled and Mann-Whitney U tests were performed to identify any significant difference between the 2 patient cohorts after the data distributions were proved to be asymmetrical. Non-parametric (asymmetrical) data were described in terms of median and interquartile range (IQR). Statistical significance was considered when p<0.05. All statistical analysis was performed using SPSS version 19.

 

Results

During the study period, a total of 500 patients presented with acute appendicitis. There were 200 patients in the rural and 300 in the urban cohorts. Results are summarised in Table 1.

 

 

Basic demographics

The mean age of patients in the rural v. urban groups was not statistically significantly different (18 v. 19 years, respectively; p=0.8). Of the 200 patients in the rural group, males comprised 57% (114/200) and females 43% (86/200). Of the 300 urban patients, there were more males 73% (202/300) and fewer females 33% (98/300) (rural v. urban for both males and females, p=0.02).

Clinical presentations

Rural-based patients had a significantly longer duration of symptoms with a median of 6 days (IQR 3 - 9) prior to presentation when compared with the median duration of 3 days in urban patients (IQR 2 - 4; rural v. urban; p<0.001). Comparison of clinical features present on admission was as follows (rural v. urban patients, respectively): anorexia 70.5% v. 69%; nausea and vomiting 80.5% v. 79%; migratory abdominal pain 28% v. 32.3%; non-migratory abdominal pain 71.5% v. 67.7%; dysuria 2% v. 3.3%; diarrhoea 4.5% v. 8.8%; and constipation 7% v. 5.3%. Differences were not statistically significant. However, significantly more patients in the rural group had generalised peritonitis on presentation (59%, 118/200 v. 20%, 60/300 urban; p<0.001); significantly more patients in the urban group had localised peritonitis (80%, 240/300 v. 41%, 82/200 rural; p<0.001). Other clinical parameters (rural v. urban, respectively) including the median temperature (37.9oC, IQR 37 - 38.4 v. 37.2oC, IQR 36.9 - 38; p<0.001), heart rate (103 bpm, IQR 90.5 - 120 v. 99 bpm, IQR 88 - 109; p<0.001) and total leukocyte counts (15.6 x 109/l, IQR 12 - 20 v. 13.9 x 109/l, IQR 11 - 15.5; p<0.001) were significantly higher in the rural group.

Operative findings

Significantly more patients from the rural group required a laparotomy (77% v. 51% urban; p<0.001) as the initial choice of surgical access, while relatively more patients from the urban group required a local incision (49% v. 23% rural; p<0.001). Highly significant differences were found at operation. An inflamed, non-perforated appendix was more commonly found intraoperatively in the urban group (52.3% v. 21% rural; p<0.001). A perforated appendix was much more common in the rural group (79% v. 47.7% urban; p<0.001). Of those patients in whom the appendix had perforated, intra-abdominal contamination was more frequently localised in the urban group (26.7% v. 18.5% rural; p=0.04), in contrast to the rural group where significantly higher perforation (60.5% v. 21% urban; p<0.001) associated with generalised, four-quadrant intra-abdominal contamination was observed.

Clinical course

The majority of patients in the urban group were managed in the general ward (97.7% v. 77% rural; p<0.001). The need for ICU admission was 10 times higher in the rural group (23% v. 2.3% urban; p<0.001). The median overall length of hospital stay was also significantly longer in the rural group (8 days, IQR 3 - 15 v. 4 days, IQR 2 - 7 urban; p<0.001). Significantly more patients in the rural group required an open abdomen (46% v. 12% urban; p<0.001) and required 1 re-laparotomies to control severe intra-abdominal sepsis (60.5% v. 23.3% urban; p<0.001).

Complications

The overall complication rate was significantly higher in the rural group (35% v. 11% urban; p<0.001). Considered separately, each of the following was significantly higher in the rural group (rural v. urban, respectively): hospital-acquired pneumonia (21.5% v. 5%; p<0.001), renal failure (14% v. 0.7%; p<0.001), wound sepsis (22.5% v. 6.7%; p<0.001) and other miscellaneous conditions (5.5% v. 0.3%; p<0.001). The overall mortality was significantly higher among rural-based patients than urban-based patients (3.5% v. 0.3%, respectively; p=0.008).

 

Discussion

Acute appendicitis is the most common surgical emergency worldwide. The natural history of appendicitis is one of progression from inflammation to perforation and on to diffuse abdominal sepsis.[5]

With early recognition and appropriate surgery, it is typically associated with low morbidity and negligible mortality.[6] However, it is a disease that is associated with disparate outcomes. Several studies from SA have reported much higher rates of appendicular rupture, and subsequently much more problematic clinical outcomes than in the developed world.[3,4] Generally, costs and length of hospital stay are all significantly longer in patients who experience appendicular rupture.[7] Appendicular rupture is associated with the need for re-laparotomy, temporary abdominal closure and ICU admission. [3] Our previous work demonstrated a significant disparity in outcome between patients in SA and those in the developed world. [3] Our current study extends this insight by demonstrating a disparity in outcome between urban- and rural-based patients within SA. Rural patients had a much longer delay between the onset of symptoms and seeking healthcare than urban patients. Consequently, when they did arrive at the regional hospital they were more ill and more likely to have diffuse peritonitis. In turn, they were more likely to require a laparotomy and ICU admission postoperatively. Rural patients were disproportionately more likely to be managed with temporary abdominal closure and re-laparotomy. They were more likely to develop acute renal failure.

Acute appendicitis is a time-sensitive pathology.[5] Once the disease process commences, progression to end-stage disease is relentless unless there is appropriate surgical intervention.[7] A number of milestones in each patient's narrative are important, including the onset of abdominal pain, parental or patient recognition of the potential urgency of the illness and timely health-seeking behaviour followed by clinical recognition of potential acute appendicitis, appropriate referral and surgical intervention. Variations in these milestones account for the disparate outcomes. SA reports on appendicitis have almost exclusively focused on black patients.[3] However, within the developed world, there are disparities in the outcome of acute appendicitis. Studies from the USA have demonstrated several associations between increased rates of appendicular rupture and variables such as method of payment, access to primary care, source of referral and ethnicity.[8,9] Higher rupture rates have been reported in ethnic minority children, younger children, children with addresses from socioeconomically poorer ZIP codes, children who lack private insurance and children referred from somewhere other than a dedicated emergency department.[10] In our study cohorts, rural patients fared significantly worse than their urban counterparts. Both groups were black, thus eliminating issues of ethnicity or cultural practices as an explanation for disparate outcomes. Rural origin of the patient emerges as an independent risk factor for appendicular rupture. The most striking underlying difference between the urban- and rural-based groups is the prolonged delay between onset of symptoms and accessing the healthcare system on the part of the latter. The risk of appendicular perforation and subsequent complications is proportional to the time between onset of symptoms and surgical intervention.

The rural communities in SA remain some of the most impoverished areas in the world.[11] However, poor health outcome in rural areas is not solely confined to SA. A significant body of literature demonstrates disparity in outcomes between urban and rural patients in developed countries with sizable rural populations such as Australia, Canada and the USA.[12] Reasons for this disparity are multifaceted. There are several common problems faced by rural areas throughout the world. They are plagued with chronic understaffing of hospitals and high staff turnover and lack specialist and radiological imaging and laboratory services. The remoteness of rural areas means that there are long delays in accessing healthcare and further delays may be associated with the transfer of these patients to higher levels.[13] Moreover, there is a shortage of basic general surgical services for rural communities throughout the world.[14]

Patients from the rural areas remote from surgical centres may experience difficulties in accessing appropriate services.[15] These difficulties are referred to as 'barriers to care' and authors have suggested various systems to classify these.[16] The classification scheme described by Grimes et al.[16] defines 3 categories: cultural (acceptability), financial (affordability) and structural (accessibility). For pragmatic and quality-improvement reasons it is useful to divide barriers to care into pre-contact (with the health system) and post-contact factors. Pre-contact factors include health-seeking behaviour, cultural factors and issues of access and affordability, while post-contact factors include delays in the recognition of the disease and delays in transfer and referral.

Health-seeking behaviour is influenced by gender, education and socioeconomic status.[17] Patients may expect spontaneous resolution of symptoms and hence delay seeking healthcare.[18] Although access to primary care is free, the perceived potential for hospital admission and subsequent loss of ability to work or missed school days potentially prevented many patients from seeking medical attention. Children may experience further delays due to lack of responsible carers.[17] KZN Province covers a vast area and has a large rural population. Within the rural Sisonke District and the urban uMgungundlovu District covered by our surgical unit, there are series of local polyclinics and 4 peripheral hospitals serving the local population. There are still significant problems with access to the local polyclinics, as substantial travelling is usually required.

Of concern is the issue of delayed recognition of the disease once the patient has presented to the health system. Rural facilities in Sisonke District have staff of varied levels of experience.[19] Almost no abdominal general surgery[20] is undertaken at these rural district hospitals; all patients with acute appendicitis are referred to the regional hospital for further assessment, thus creating two further potential delays - in diagnosis/recognition (it is not uncommon for patients to be sent home from a healthcare institution on several occasions with an incorrect diagnosis (authors' personal observations)) and in transportation from a district to a regional hospital for surgery.

 

Conclusion

This survey identifies rural origin as an independent risk factor for appendicular rupture and a poor clinical course. Rural patients have major delays between the onset of symptoms and definitive surgery compared with urban patients. The exact reasons for these delays require further investigation. Health-seeking behaviour is complex and is influenced by rural poverty and remoteness as well as cultural issues such as the reliance on traditional healers as a primary source of care and health advice.

However, failure of clinical recognition once contact with the health system has been made followed by delays in transfer for surgery to the regional hospital are failings of the health system. Intervention is urgently needed to improve the outcomes of acute appendicitis among rural patients, following further research aimed at quantifying the relative contributions of patient behaviour and the failings of the health system.

 

References

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Correspondence:
D L Clarke
(damianclar@gmail.com)

Accepted 15 July 2013

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