The aim of this study is to study the changes of Nailfold Microcirculation in patients with chronic renal failure, to clarify the correlation between the changes of Nailfold Microcirculation and renal function, and to explore whether nailfold microcirculation can be used as an indicator of renal microcirculation in patients with chronic renal failure, and to provide a noninvasive method for the clinical evaluation of renal microcirculation in patients with chronic renal failure.
