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INTRODUCTION
Common Chronic Low
Back Pain (CCLBP) is a public health concern that has considerable
socioeconomic impact in developed countries and that is becoming increasingly
frequent in developing countries [1-3]. The chronic pattern of the condition
leads to a very significant psychosocial impact [3]. Quality of life is a
multidimensional concept developed in the 1970’s, for the follow up of chronic
illnesses. The definition of this concept is still not consensual [4-7].
Depending on the type of illness, several tools have been developed for its
assessment. Quebec Back Pain Disability Scale (QBPDS) and Dallas Pain
Questionnaire (DPQ) are the most suitable up-to-date tools, for the functional
evaluation of CCLBP [6-8]. In sub Saharan Africa, quality of life of patients
with CCLBP has been subject of few studies these last year’s [9,10]. The aim of
our study was to assess quality of life of patients with CCLBP in Yalgado
Ouédraogo Teaching Hospital.
METHODS
It was a
cross-sectional study from January to June 2013 in the services of
Rheumatology, Neurology and neurosurgery of Yalgado Ouédraogo Teaching
Hospital. Were included all patients over 18 years of Age, having a Common
chronic low back pain diagnosis based on the anamnestical, clinical and
radiological elements. All patients benefited from the realization of a
hemogram, a sedimentation rate and a C reactive protein to exclude all
secondary lumbalgia as infection, tumor or inflammatory rheumatism. All
patients benefited from an x-ray and or a lumbar spine scanner. A written
nameless questionnaire including the self-administered DPQ [6] and the QBPDS
[11], were used for data collection. To avoid confusions, additional interview
was conducted by the same operator, who had to explain misunderstood items to
the patients, and assess clinical evolution based on Visual Analog Scale (VAS).
All patients gave informed consent. Confidentiality of data and ethical rules
were respected throughout the study. Data were entered and analysed with the
Epi Info 3.5.1 software. ANOVA test was used for statistical comparisons, and a
difference was considered significant when P<0.05.
RESULTS
Ninety-five patients
were enrolled. We had 67 females and 28 males, with a sex-ratio of 0.41.
Average age was 47.7 years ± 14.1 years with extremes of 18 years and 82 years.
Average severity of low back pain on first visit, was 6.6/10 based on VAS.
Assessment of low
back pain impact on quality of life, through the self-administered DPQ,
reported average impairment of 34.6% distributed as follow: 46.1% for daily
activities with extremes of 3% and 84%; 38.6% for professional activities and
entertainment with extremes of 0% and 95%; then 23.5% for sociability with
extremes of 0% and 80%.The QBPDS reported an average impairment of 37.9% with
extremes of 6% and 84%.
Patients with at
least 50% impairment of quality of life, based on both DPQ and QBPDS, were
analysed. Data analysed were age, gender, sport practice, pain severity and
marital status. Distribution of patients assessed by quality of life evaluation
tools and depending on data collected is presented in Table 1.
DISCUSSION
Quality
of life of patients with CCLBP in Ouagadougou is impaired, regardless of the
quality of life evaluation scale that is used (self-administered DPQ and
QBPDS). This is the first study in our context on the quality of life of
patients followed in rheumatology in general and on low back pain in
particular. Average age of our patients was 47.7 years. Except Fianyo in Togo
[9], who reported an average age of 38 years, our result is similar to those of
Africans and Caucasian series [9,10,12], with average ages between 47.8 years
and 51 years. Age over 45 years is a factor of chronicity of low back pain, and
thus, of quality of life impairment. In the industrial sector in France,
chronic low back pains are the leading cause of disability among workers under
45 years [3,13]. Female predominance was noticed, with a sex-ratio of 0.41.
This female predominance in our study could be related to the fact that women
perform domestic work and also because of the physiological hyperlordosis of
the African woman. Based on VAS, the average severity of low back pain on first
visit was 6.6/10 with extremes of 2/10 to 10/10. Fianyo [9] in Togo and Wilhelm
[13] in France reported average VAS of 5/10 with extremes of 2/10 to 9/10 and
3.4/10 with extremes of 1.9/10 to 4.9/10, respectively. This great difference
could result from the fact that many of our patients had difficulties with the
VAS and possibly used to overrate pain severity. Assessment of quality of life
based on the DPQ in our study, noticed an average impairment higher than that
of Fianyo in Togo (about 20.2%); but lower than that of French series [11,13]. Table 2 compares our results to those
of other African and French studies. These results show that quality of life is
more impaired in French with low back pain, than in African. The bias due to
linguistic challenges during administration of the questionnaire, could lead to
underestimation of their lesion by some patients. Otherwise, one might assert
that patients with CCLBP in Ouagadougou (Burkina Faso) have higher capacity of
acceptance and adaptation, than French counterparts.
Diomandé
and Kakpovi respectively in Ivory Cost and Togo, reported a prevalence of
anxiety and depressive disorders of 30.7% and 39% in CCLBP [10,14]. This low
prevalence of anxiety and depressive disorders in West Africa could be related
to under diagnostic. Indeed, cultural fatality attributed to psychiatric
illnesses, disturbs number of patients who deny their anxiety and depressive
condition. Our study shows a statistically significant association between
considerable impairment of quality of life (over 50%), and some of the
socio-demographic and clinical variables. VAS of at least 6/10 was associated
with impaired quality of life, based on both DPQ and QBPDS. Lack of sports
activity is associated with deterioration of the following specific scores:
“daily activities” (p=0.04); “anxiety and depression” (p=0.01). Several studies
emphasize the importance of sport in both preventive and curative management of
CCLBP [6,15-18]. Other studies about sport and low back pain should be
undertaken with a larger population in order to understand the difference with
other series. In our medical environment, age, gender and marital status are
not significantly associated with a great impairment of quality of life of
patients with low back pain.
Our
study has some limitations, inherent to the low level of education of some
patients. For some of our patients not speaking French, it was necessary to
translate and explain the questionnaire in dialects that were not always fluent
for the interpreter.
CONCLUSION
In
Burkina Faso, CCLBP causes significant impairment of quality of life of
patients in hospital environment. Severity of pain and lack of sport contribute
to further deteriorate quality of life. Difficulties to adapt quality of life
questionnaires to local languages hinder the understanding by some patients and
therefore reduce the reliability of data collected. Further studies based on
contextualized questionnaires, could lead to better conclusions.
CONFLICT OF INTEREST
None
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