Prevalence of tuberculous lymphadenitis in Gondar University Hospital, Northwest Ethiopia
© Muluye et al.; licensee BioMed Central Ltd. 2013
Received: 19 September 2012
Accepted: 30 April 2013
Published: 3 May 2013
Tuberculous is the leading cause of death worldwide with a large number ofdeaths occurring in developing countries. Tuberculous lymphadenitis is amongthe most common presentations of extra pulmonary tuberculous. This studyattempts to determine the magnitude of tuberculous lymphadenitis frompatients with lymph node aspirate in Gondar University Hospital, NorthwestEthiopia.
Retrospective study was conducted. Data were collected from registration bookof Gondar university Hospital pathology laboratory after checking thecompleteness of patient’s necessary information like age, sex and fineneedle aspiration cytology results. Data were entered and analyzed usingSPSS version 16 statistical package. Chi-square test was done to determineassociations.
A total of 3,440 lymph node aspirates were examined using fine needleaspiration cytology. Of these, 2,392 (69.5%) cases were found to havetuberculous lymphadenitis. Male 1647(47.9%) to female 1793(52.1%) ratio ofall study subjects were 0.9:1. Females (54.1%) were more affected than males(45.9%). Age, sex and site of aspiration were found to be statisticallyassociated with tuberculous lymphadenitis (p-value < 0.001).The age group of 15–24 years had the highest prevalence of tuberculouslymphadenitis followed by those of 25–34 years old. The most affectedsites were cervical lymph nodes (47.5%) followed by auxiliary (19.4%) andsubmandibular (12.9%) lymph node regions. None of the records documented theHIV status of subjects.
The prevalence of tuberculous from lymph node aspirate was found to be higherinvolving the frequently affected site of cervical lymph node. The HIVstatus of patients with all forms of tuberculous should have to be checkedand documented. Further prospective and advanced studies are recommended todetermine the specific etiologic agents and contributing factors.
KeywordsTuberculous lymphadenitis Fine needle aspiration cytology Ethiopia
Tuberculous (TB) is a chronic bacterial disease caused by a slightly curved nonmotile, aerobic, non-capsulated and non-spore forming strains of mycobacteriausually Mycobacterium tuberculous. It is a major public health problem in the world and 1/3 ofworld’s population is infected predominantly in developing countries . The magnitude of TB is higher in the developing world due to variousfactors including malnutrition, different causes of immune suppression, dual HIV-TBepidemic and increasing causes of drug resistant TB (Multi drug resistant TB(MDRTB), Extreme drug resistant TB (X-DRTB)) . Ethiopia ranks 7th in the list of 22 high burdens countries severelyaffected by tuberculous . As per WHO global TB report of 2012, the estimated incidence of allforms of TB in Ethiopia was 220/100,000 population  and smear positive cases was 63/100,000 population .
Extra pulmonary tuberculous (EPTB) affects different organs of human body wheretuberculous lymphadenitis (TBLN) is the most common manifestations of all EPTB [7–10]. The most commonly involved lymph nodes were cervical, axilliary,inguinal, abdominal and supra clavicular sites. Cervical lymph nodes are the mostcommonly affected group of nodes . Tuberculous that affects cervical lymph nodes represents about 50% ofEPTB even though it could vary in different areas . A number of studies showed higher proportion of tuberculouslymphadenitis among patients in different areas [13–16]. In a study conducted in the rural part of Ethiopia, 72.8% cases of TBLNwere found  and the cervical region was the most affected site (74.2%) followed bythe axillaries and inguinal lymph node regions, 20.3% and 4.3%, respectively .
In Ethiopia, there are only few reports concerning TBLN. Particularly in Gondar thereis no data that shows the magnitude of TBLN. This study attempts to assess themagnitude of TBLN and provide baseline information for health professionals andother concerned bodies. Therefore, the aim of the study was to assess magnitude ofTBLN from patients with lymph node aspirate in Gondar University Hospital.
A retrospective study of seven years period from January, 2003 to January, 2007 andJanuary, 2010 to January 2011 was carried out in Gondar University Hospitalpathology laboratory registration book. Gondar is found in North West part ofEthiopia, with in the Amhara regional state at about 748 and 175 kilometers awayfrom the capital Addis Ababa and Bahir Dar respectively. The population of the townis about 206,987 as stated in central statistical agency (CSA) of Ethiopia,2007.
The study populations were all patients with lymph node aspirate in Gondar UniversityHospital. The study subjects were all patients with lymph node aspirate betweenJanuary, 2003 and January, 2007 and January, 2010 to January, 2011. All patientswith lymph node aspirate between January, 2003 to January, 2007 and January, 2010 toJanuary, 2011 were included in the study by collecting data from the registrationbook. Records with incomplete data and demographic characteristics were excluded.TBLN diagnosis by cytology was made by examination of the presence of caseousnecrosis, epitheloid cell granulomas, multi nucleated giant cells, degeneratedepithelioid cell with neutrophil and hetrogeneous lymphoid population plusgranulomatous features.
Data were collected by investigators from registration book of Gondar universityHospital pathology laboratory after checking the completeness of patient’snecessary information like age, sex and fine needle aspiration cytology results.Data were analyzed using SPSS version 16 statistical package. Data were summarizedusing descriptive statistics. Association was done using Chi-square test and P-value<0.05 were considered statistically significant.
Data were collected after ethical clearance obtained from the School ofBiomedical and Laboratory Sciences, College of Medicine and Health Science,University of Gondar. After discussing the purpose and aim of the study,permission was obtained from the Head of Gondar University Hospital pathologylaboratory before the data collection.
Distribution of patients with tuberculous lymphadenitis by sex, age andsite of aspiration in Gondar University Hospital from January,2003– January, 2007 and January, 2010– January, 2011G.C.
Site of aspiration
Age, sex and Site of aspiration were found to be significantly associated with TBLN.The age group of 15–24 years had the highest prevalence 682 (28.5%) followedby those of 25–34 years with 660 (27.6%) and 35–44 years with 347(14.5%) and >45 years with 299 (12.5%) (P-value < 0.001).Tuberculous lymphadenitis was higher in females than males with statisticallysignificant difference (p-value < 0.001). The most affected siteswere cervical lymph nodes, axillary and submandibular with statistically significantdifference (p-value < 0.001) (Table 1).None of the records documented the HIV status of patients.
The prevalence of tuberculous lymphadenitis has been reported to be higher indeveloping countries like Ethiopia compared to developed countries . In this study, the prevalence of TBLN was 69.5% which is identical withother study done in Tanzania with prevalence of 69.5% . Other studies in Israel, Ethiopia and India showed similar figure withprevalence of 70%, 72.8% and 73.75% [17, 19, 20] but to some extent higher in another Indian study with prevalence of 83% . The higher prevalence in this Indian study could be due to the samplesize and the time of study where awareness of TB was poor years ago. In contrast tothis study, the prevalence of TBLN was lower in Nigeria (24.45%), Pakistan (44%) andIndia (62%) [13, 15, 21]. This difference could be due to the different study methods used wheresmall sample size was used in Pakistan and in India. In addition, these studies wereonetime studies while our study is retrospective study.
The age profile of patients with TBLN showed involvement of younger patients with15–24 years old being affected accounting 28.5% followed by 25–34 yearsold accounting 27.6% of the cases. This finding is similar to other studies whereyounger than 30 years old are the commonest age group affected by this disease . Similar study in Nigeria showed the age group of 10–19 years oldwith highest prevalence (28.1%) and 20–29 years with 21.8% which is consistentwith our study but the magnitude of the age group 0–9 years has prevalence of26.3% which is higher than our study . Male to female ratio of our study is found to be 0.9:1 in which femalesbeing highly affected than males with no obvious preponderance in Israel, Pakistan,Nigeria, Ethiopia [11, 15, 18, 19]. Cervical lymph node was found to be the most commonly affected site(47.5%) compared to axillaries and other affected sites. This finding is inagreement with the previous study done in Ethiopia where cervical regions (74.2%)being mostly affected site followed by axillary (20.3%) and inguinal regions (4.3%)  and the study in India and Nigeria were also revealed similar manner [15, 21]. Historically, tuberculous cervical lymphadenitis has been more common inchildren and young adults .
The trend prevalence of TBLN cases in this study was variable over the yearsrevealing increment in the recent years. The variation in patterns of prevalence ofTBLN might be due to TB-HIV co-infection, other immune compromization (chronicdiseases) that causes immune suppression and increased risk of developingtuberculous, awareness of people about early diagnosis and treatment of TB patients.Especially in 2003 and 2004 before the era of anti retroviral therapy, the numbersof cases were higher compared to 2005 and 2006. The reason for decreased prevalencein the two consecutive years could be due to lack of service expansion in thehospital hence patients were appointed for more than a month and cannot come back tothe hospital. In 2007, 2010 and 2011, there was slight increment in number of cases.This might be due to the increased awareness of community about tuberculous and getdiagnosed than the previous years. Increased cases of malnutrition, chronic diseasesand MDR-TB could also exaggerate the rate of TBLN in these recent years. The otherreason could be increased patient health seeking behavior, service expansion wherepatients were not appointed not more than a week, well equipped laboratory serviceand increased number of pathologist by which the quality of the service increasedthe case detection rate as well as the number of patients compared to the previousyears. Previously there was no or one off and on type of pathologist but recentlythere are at least three actively working pathologists which might contribute forincreased case detection rate.
This study tried to assess yet untouched area in the study site. It is very valuableand informative which could give insights for health professionals and policy makersto address the problem. The HIV status of patients with TB (prior emphasis for EPTB)should have to be checked and documented. We couldn’t able to include othersocio demographic variables which has contribution for tuberculous because ofincomplete registration. Lack of the two years data in between due to fire accidenton pathology laboratory was also the dare for generalization to the overall trendprevalence.
The prevalence of TBLN in patients with lymph node aspirate in Gondar UniversityHospital is high. Among all lymph node sites, cervical region was the predominantlyaffected site compared to other sites. Female patients were more affected thanmales. It is important for pathologists to be conscious of tuberculous caseswhenever they encounter enlarged lymph node region. The HIV status of patients withTB (prior emphasis for EPTB) should have to be checked and documented. Furtherprospective and advanced studies are recommended to determine the specific etiologicagents and contributing factors of TBLN in the study area.
We acknowledge the staff of Gondar University Hospital pathology laboratory fortheir cooperation during data collection.
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