Why do patients with uremia experience low blood pressure?

Under normal circumstances, hypotension in patients with uremia is primarily caused by inadequate nutritional intake, orthostatic hypotension, chronic anemia, hypothyroidism, and chronic heart failure. If patients experience pronounced symptoms such as dizziness and fatigue, they should promptly seek evaluation and management at a reputable hospital’s nephrology department. A detailed analysis follows:

1. Inadequate Nutritional Intake

Patients with uremia often adhere to strict dietary restrictions, resulting in chronically insufficient intake of protein and calories. This leads to inadequate replenishment of intravascular volume and reduced circulating blood volume, thereby causing hypotension. Daily dietary adjustments should be made appropriately: high-quality protein may be supplemented in moderation within the limits permitted by the patient’s clinical condition, and meals should be small and frequent to sustain baseline energy requirements.

2. Orthostatic Hypotension

Prolonged bed rest slows peripheral circulation. Upon sudden standing, blood rapidly pools in the lower extremities, leading to transient cerebral hypoperfusion and a rapid drop in blood pressure. To mitigate this, patients should move slowly when changing positions—gradually transitioning from lying to sitting, then to standing—to minimize abrupt fluctuations in blood pressure associated with rapid postural changes.

3. Chronic Anemia

Uremia suppresses hematopoiesis, resulting in persistently declining red blood cell counts, diminished oxygen-carrying capacity of blood, and reduced systemic perfusion efficiency—all contributing directly to hypotension. Under physician guidance, anemia may be corrected using recombinant human erythropoietin injection, ferrous succinate tablets, and vitamin B₁₂ tablets, thereby gradually stabilizing blood pressure.

4. Hypothyroidism

During illness, metabolic rate progressively declines, vascular tone weakens, and circulatory drive diminishes—leading to persistent hypotension. Under medical supervision, levothyroxine sodium tablets, Yikang capsules, and Buzhong Yiqi pills may be prescribed to regulate metabolism and improve vascular circulation, thereby steadily elevating blood pressure.

5. Chronic Heart Failure

Long-standing uremia impairs cardiovascular function, progressively weakening cardiac pumping capacity. Consequently, blood flow becomes inefficient, resulting in inadequate perfusion to vital organs and refractory hypotension. Mild cases may be managed per physician instruction with Shengmai Yin oral solution, Sensong Yangxin capsules, or Qili Qiangxin capsules to support cardiac function. In severe cases, surgical interventions such as cardiac valve repair may be required to restore optimal cardiac perfusion architecture.

In daily life, patients should ensure adequate rest and avoid overexertion; maintain appropriate body warmth to prevent vasoconstriction; strictly adhere to prescribed renal medications; monitor blood pressure regularly; follow a low-salt, low-fat, light diet; limit intake of high-water-content foods; and undergo periodic laboratory assessments—including complete blood count, cardiac function tests, and thyroid function studies—to enable timely adjustment of therapeutic and supportive strategies.