Studying Thyroid Function of Haemodialysis Patients in Upper Egypt (Two Centers Study).

2.1 Background (Research Question, Available Data from the literature, Current strategy for dealing with the problem, Rationale of the research that paves the way to the aim(s) of the work). (200-250 words max.) The study of thyroid function in hemodialysis patients is a critical area of research due to the complex interplay between renal failure and thyroid pathology. Chronic kidney disease (CKD) and end-stage renal disease (ESRD) have been associated with various thyroid abnormalities, including hypothyroidism and low triiodothyronine (T3) syndrome (1). These conditions can significantly impact the morbidity and mortality of patients undergoing hemodialysis (2).

In hemodialysis patients, the prevalence of thyroid dysfunction is higher compared to the general population(3). This is partly due to the altered metabolism and clearance of thyroid hormones and the impact of uremic toxins on thyroid function (4). Moreover, thyroid hormones play a crucial role in cardiovascular health, which is of particular concern in hemodialysis patients who are already at an increased risk for cardiovascular events (5).

Recent studies have shown that even subclinical hypothyroidism, where patients have an elevated thyroid-stimulating hormone (TSH) level but normal thyroxine (T4) levels, can be associated with adverse outcomes in hemodialysis patients (6). This condition may contribute to an increased risk of cardiovascular disease and mortality (7).

The assessment of thyroid function in hemodialysis patients typically involves measuring serum levels of TSH, free T4, and T3 (8). However, interpreting these levels can be challenging due to the effects of medications, nutritional status, and non-thyroidal illness on the thyroid axis (9). It is also important to consider the impact of hemodilution on thyroid function tests, as it can lead to misinterpretation of the results (10).

Management of thyroid dysfunction in hemodialysis patients requires careful consideration. While thyroid hormone replacement therapy is commonly used to treat hypothyroidism, the optimal target levels of TSH and T4 in this population are still under investigation (11). Additionally, the benefits of treating subclinical hypothyroidism in hemodialysis patients remain uncertain (12).

In the context of Egypt, the prevalence of thyroid dysfunction among hemodialysis patients mirrors global trends. A study conducted in a South Indian cohort, which may have parallels in Egypt due to similar dietary and environmental factors, found a high prevalence of subclinical hypothyroidism in hemodialysis patients(13). This suggests that thyroid screening and management should be an integral part of care for hemodialysis patients in Egypt as well.

Egypt's healthcare system has been making strides in improving the management of chronic diseases, including CKD and its complications. With a growing focus on preventive care and early intervention, the management of thyroid dysfunction in hemodialysis patients is likely to receive more attention in the coming years (14).

In Upper Egypt, research has been conducted to investigate the prevalence and nature of thyroid abnormalities among hemodialysis patients. A cross-sectional observational report enrolled 160 subjects at Al-Hussein Hospital, Al-Azhar University, and the National Institute of Nephrology and Urology, revealing significant correlations between thyroid hormones and various clinical parameters (15). Another study assessed thyroid hormone levels in 200 patients with chronic renal failure undergoing maintenance hemodialysis, finding a high prevalence of thyroid hormone dysfunction even in clinically euthyroid patients(16).

In conclusion, the study of thyroid function in hemodialysis patients is essential for optimizing patient outcomes. With ongoing research and improved clinical practices, the management of thyroid dysfunction in this vulnerable population can be enhanced. As Egypt continues to develop its healthcare infrastructure, it is poised to make significant contributions to this field of study (17).

• 1. Correlation of TSH Concentrations with Age: A secondary outcome measure could be the correlation of TSH concentrations with age. [Time frame: 1 year]