The demographic and epidemiological transitions that humanity is undergoing are having a major impact on the global healthcare system. Anemias are at the crossroads of epidemiological mutations, straddling both chronic and acute pathologies. Anemia is defined as a drop in hemoglobin levels. The threshold values defined by the World Health Organization (WHO) in 1968 remain generally accepted: hemoglobin level < 130 g/dl for men and <120 g/dl for adult women [1] . Senile anemia does not exist. Anemia is the most common hematological disorder. It is a real worldwide public health problem. The highest prevalence is found in South Asia, Central Africa and West Africa [2] . Its frequency increases with age, rising from 10.3% between the ages of 17 and 49% to 26% over the age of 75 [3] . In geriatric practice, anemia can be a sign of several diseases [4] . It is a major cause of morbidity and mortality, and can worsen vital and functional prognosis, especially in the presence of associated geriatric syndromes. Unfortunately, few studies have focused on the particularities of anemia in the elderly in Africa. In Senegal, the only study on the anemia of elderly subjects was carried out in 2015 in an internal medicine department [5] and did not take into account the data from the standard geriatric assessment. It is in this context that we proposed to carry out this study in the first university geriatric service in the sub-region, with the main objective of updating the data on the issue and highlighting the dimensions of standardized geriatric assessment.

This study was carried out in the geriatric short-stay department of the University Hospital of Fann. It is located in Dakar, the capital of Senegal, which has 339,8362 residents out of a total population of 17,215,433. The capital city alone accounts for 19.7% of Senegal’s population. Fann Hospital is a level 3 facility at the top of the national health pyramid, with a vocation for care, research and medical training. It has several specialized departments, making it an ideal setting for a cross-disciplinary field such as geriatrics, whose department was created in 2015. It is the first geriatric university department in the sub-region. Its activities include outpatient consultation, home visits, day hospitalization with a capacity of 3 beds and a short-stay hospitalization unit with 9 beds.

This was a retrospective, descriptive study from May 01, 2019, to December 31, 2021. We carried out the study on a population of 502 patients aged at least 60 admitted to the department during this period. Twelve patients were excluded from the study because their medical records were incomplete and unusable. A total of 162 patients met the diagnostic criteria for anemia on the basis of a drop in hemoglobin levels of less than 13 g/l in men and 12 g/l in men.

Data were collected using a data collection form, after free and informed consent had been obtained from the elderly patient or his/her legal representative. Sociodemographic, clinical and therapeutic variables were studied. Geriatric syndromes were sought almost systematically, using tools validated in the elderly: Katz’s Activities Daily Living (ADL) to assess functional autonomy for daily activities; Mini-nutritional assessment (MNA) for nutritional status; Geriatric Depression Scale (GDS) for mood and the Senegal test (20) to assess neurocognitive functions. Severity of anemia was defined according to the hemoglobin level: slight to moderate between 8 and 12 g/d; severe between 6 and 8 g/l and very severe below 6 g/l. Data collection and analysis were performed using SPSS 24.0 software. Quantitative variables were expressed as frequency (%) and mean with standard deviation; qualitative variables as frequency.

The prevalence of anemia in our study was 32.3%. Anemia is a frequent biological abnormality in geriatric medicine. Our prevalence is corroborated by several data found in the literature. In Africa, few studies are available on anemia in the geriatric setting. Bourgi et al. in the internal medicine department of the University Hospital of Aristide le Dantec (Dakar) reported in 2015 a prevalence of 34.2% (5), at Hôpital Général de Douala, Eveline NDT reported a prevalence of 62.2% (4). Konan MN in Côte d’Ivoire, at CHU de Treichville reported 79.56% of elderly diabetics with anemia [6] . Andrew Moore et al. [7] , in a meta-analysis of 45 studies carried out in developed countries with a cohort of 85,409 elderly patients. Andrew Moore et al. [7] , in a meta-analysis of 45 studies carried out in developed countries with a cohort of 85,409 elderly patients, found a prevalence of anemia of 39%. Patel, in a large study involving 21,079 patients, carried out in the United States and Italy, reported a prevalence of 40% [8] . The low prevalence of anemia in our study compared with the results of Eveline NDT et al. [4] n Cameroon and Konan MN et al. [6] in Côte d’Ivoire, both from sub-Saharan African countries, could be explained by the acute geriatric vocation of our department. Malaria is also endemic in Cameroon, unlike in Senegal, where it is in

the process of being eradicated [4] . The main geriatric syndromes frequently found were loss of functional autonomy of ADL (65%), undernutrition (59%) and frailty (46%). Poly-medication, with at least 5 drugs taken regularly, was identified in 22% of patients. Most prescriptions were medical (89%), followed by self-medication (11%) and Herbal medicine in the form of decoctions (3%). In France, Abrar-Ahmad Zulfiqar at Rouen University Hospital (CHU de Rouen) reported, in a bi-variate analysis, poorer functional and cognitive autonomy in elderly patients with anemia: The ADL score was 1.81 with IC 95%: [1.52; 2.09] versus 3.75, IC 95%: [3.39; 4.11] for non-anaemic elderly people (p < 0.0001), the IADL score was 0.52, IC 95%: [0.32; 0.72] versus 1.84 IC 95%: [1.57; 2.10] for non-anemic people (p < 0.0001) [9] . The Women Health and Aging Study (WHAS), the Established populations for epidemiologic studies of the elderly (EPESE) and the Chianti studies all agree that anemia in people over 65 is associated with a reduction in IADL (instrumental activities of daily living) and reduced mobility. Patients with anemia had a lower rate of recovery from disability in ADL than those with normal hemoglobin levels (7.0% vs. 11.6%; P < 0.001) [10] . Correcting anemia in the elderly could therefore be a source of improved quality of life. With regard to frailty, the Fried score was inversely higher in patients with anemia (3.88, CI 95 [3.64; 4.12] versus non-anaemic subjects: 2.01, CI 95 [1.73; 2.30], p < 0.0001). Cognitive assessment with the MMS revealed no causal relationship between anemia and cognitive impairment (p = 0.065, odds ratio 2.64) [9] .

Konan MN in Côte d’Ivoire, using the Senegal test, reported suspected cognitive impairment in 91.27% of anemic patients versus 8.73% of non-anaemic patients (p-value 0.0000001). The causal link could not be established [6] . Nutritional status as assessed by albumin was slightly impaired in anemic patients (28.59 versus 30.2) [9] . The MNA reported poor nutritional status in 94.6% versus 5.4% of non-anaemic patients, a risk of undernutrition in 88.3% versus 11.7%, and good nutritional status in 44.7% versus 55.3% (p-value 0.0000001) [6] . Anemia and malnutrition are risk factors for frailty in the elderly. Poly medication and low serum albumin are independent risk factors for anemia in geriatric patients [11] . Depressive mood was present in 80% of diabetic patients with anemia [6] . Geriatric syndromes are factors of increasing vulnerability, predisposing the elderly to functional decline. They result from the deterioration of one or more physiological systems. Anemia is recognized as a risk factor for a number of impairments in the elderly. It is associated with an increased risk of reduced muscular strength and physical performance, falls, cognitive impairment, hospitalization and mortality [12] . The main etiologies of anemia in our series were infectious (32.7%), chronic renal failure (20.9%) and martial deficiency (7.4%). In eleven percent (11.1%) of cases, the causes were undetermined. This etiological profile differs in several respects from that found in the NHANES III study, where 34% of patients had vitamin B12, folic acid and/or iron deficiency, 12% had chronic renal failure (creatinine > 120 mmol/L or creatinine clearance < 60 mL/min), 20% had a chronic disease (rheumatoid arthritis, haemopathy, cancer, etc.) and 34% had an undetermined cause [13] . Eveline NDT in Cameroon reported 76.3% acute inflammatory causes [4] . In the wake of the epidemiological transition, infectious diseases persist in Africa, constituting a double burden for the elderly. Self-medication and phytotherapy represent a major risk of kidney damage in our context. Around 30% of anemias in the elderly remain unexplained [14] . The heavy burden of comorbidities and polymedication that accompanies the elderly sometimes makes it difficult to determine the underlying cause of anemia in this population. Against this backdrop, the “Anemia Working Group” of the German Geriatric Society has drawn up a second proposal document: “The multi-causality and significant association between anemia and quantifiable assessment-based impairments suggest that anemia in the elderly should be considered a geriatric syndrome.” [15] . Martial supplementation was performed in 23.5% of our patients. 37% of patients received a blood transfusion. This management was combined with etiological treatment of the anemia and comorbidities. The hemoglobin level at which anemia is treated depends on clinical circumstances such as patient tolerance, the etiology of the anemia, and whether it is acute or chronic. Most often, a level of 9 g/L is reported (mean 10.24 ± 0.89 g/L), but around 80 practitioners indicate 11 g/L and around 20 12 g/L. On the other hand, about twenty indicate 9 or even 8 g/L [3] . Transfusion thresholds differed from those recommended in Siriwardana’s cross-sectional survey [16] . Transfusion was mainly based on signs of poor tolerance. The most frequent were confusion (23%), drowsiness (22%), heart failure (17%) or coronary insufficiency (16%) [16] . Anemia carries an increased risk of therapeutic complications, especially in relation to underlying pathology and visceral failure. In our study, the outcome was favorable, with 72% of our patients returning home, 9% being transferred to other departments, and a death rate of 19%. Even a moderate hemoglobin deficit should never be considered an inevitable consequence of aging, as it is associated with a number of negative clinical impacts and increased mortality, irrespective of its etiology [17] .

The limitations of our study were as follows:

- Information bias inherent in the retrospective method of data collection, with missing data varying in proportion from one case to another.

- We were confronted with a number of constraints in the course of our work:

• Lack of resources in some patients, which made it difficult to carry out the additional investigations requested, thus limiting the paraclinical investigations essential for the management of anemia.

• Lack of data in certain files, which were supplemented by the nurses’ register and the consultation register.

Anemia is a frequent pathology in geriatric practice that should not be trivialized. It is marked by a high frequency of geriatric syndromes. A multidimensional geriatric assessment is essential for all hospitalized elderly patients with anemia.

The authors declare no conflicts of interest regarding the publication of this paper.

Sall, A., Bâ, M., Babou, P.T., Djajheté, R., Bâ, D. and Coumé, M. (2023) Particularities of Anemia in the Elderly: Experience in a Geriatrics Department in Senegal. Journal of Biosciences and Medicines, 11, 71-81. https://doi.org/10.4236/jbm.2023.118007