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Chronic Kidney Disease: A 21st Century Medical Challenge

By Susan Eymann, MS05 Aug 2019

Chronic kidney disease (CKD) is is a major 21st century medical challenge. More than 650,000 patients per year in the United States and an estimated 2 million patients worldwide are affected by end stage renal disease (ESRD). These patients will require GettyImages-537645661renal replacement therapy to survive. The rapid rise of common risk factors such as diabetes, hypertension and obesity, especially among the poor in developing nations, will result in even greater and additional burdens on medical communities.

Although CKD is classified into five stages, renal insufficiency is limited to stages 3 - 5, with a glomerular filtration rate (GFR) below 60 ml/min per 1.73 m2 for three months or more.

The stages of CKD are as follows:

Stage 1: Kidney damage (normal or elevated GFR 90) (asymptomatic)

Stage 2: Kidney damage (mildly decreased GFR 60 – 89)

Stage 3: Moderately decreased GFR 30 – 59)

Stage 4: Severely decreased GFR 15 - 29

Stage 5: End stage renal disease (ESRD): characterized by GFR below 15 ml/min per 1.73 m2 and has two phases:

  1. The first is treated conservatively without dialysis;
  2. The second phase requires the initiation of renal replacement therapy (RRT) in the form of dialysis or transplantation in order to sustain life.

The number of patients starting renal replacement therapy per year has increased exponentially. The significant improvements in the treatment of cardiac diseases and cancer and in survival over the past decades has allowed many patients to survive in the more advanced stages of CKD and require renal replacement therapy. Moreover, potentially nephrotoxic drugs, such as non-steroidal anti-inflammatory drugs, antibiotics and chemotherapy agents are used more commonly and may lead to increased numbers of CKD.

Of the 547,982 prevalent ESRD patients in the United States in 2008, 70 percent were being treated by dialysis while 30 percent had a functioning kidney transplant. Diabetes accounts for 44% of incident ESRD while hypertension accounts for 27.9%. The incidence of type 2 diabetes doubled from the 1970s to the 1990s. Therefore, global efforts should be continued to prevent and treat acute and especially chronic conditions that could potentially lead to ESRD, most notably, diabetes and hypertension.

There are disparities in the incidence and prevalence of ESRD within and between developed countries that reflect racial and ethnic diversities. For instance, the incidence is higher among African and Native Americans and aboriginal people of Australia and New Zealand than their Caucasian counterparts. In the United States, minority and low-income ESRD patients are disproportionately represented. Compared to whites:

  • African Americans are 3.5 times more likely to have ESRD
  • Native Americans are 1.5 times more likely to have ESRD
  • Hispanics are 1.5 times more likely to have ESRD

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Reference: Schmidli J, et al, Vascular Access: 2018 Clinical Practice Guidelines of the European Society for Vascular Surgery (ESVS), European Journal of Vascular and Endovascular Surgery (2018), pp 7-8.https://doi.org/10.1016/j.ejvs.2018.02.001