Clinical Manifestations of Chronic Renal Failure

Clinical manifestations of chronic renal failure vary across its different stages. Chronic renal failure is divided into five stages: stages 1–3 constitute the compensated phase, while stages 4–5 represent the decompensated phase. During the compensated phase, patients may be entirely asymptomatic; some experience fatigue, low-back discomfort, nocturia, or other nonspecific symptoms, while others may develop anorexia, Kussmaul respiration (indicative of metabolic acidosis), or mild anemia.

In the intermediate and advanced stages of chronic renal failure, symptoms such as fatigue, nausea, and nocturia become increasingly prominent. In end-stage uremia, patients may exhibit signs of acute left ventricular heart failure—including dyspnea, orthopnea, and coughing up pink frothy sputum—or manifestations of hyperkalemia—such as abdominal distension and bradycardia—or gastrointestinal bleeding (e.g., hematemesis), central nervous system dysfunction, and other life-threatening complications.