Electrolyte Balance Flashcards

Which electrolyte is most commonly removed during hemodialysis?

Answer: Potassium

Potassium is a critical electrolyte that accumulates in patients with kidney failure because their kidneys are unable to excrete it effectively. High potassium levels (hyperkalemia) can be life-threatening due to its profound effects on heart rhythm, potentially causing cardiac arrest. Hemodialysis effectively removes excess potassium to maintain a safe balance.

Why is potassium balance important in dialysis patients?

Answer: It affects heart rhythm

Potassium plays a crucial role in nerve and muscle cell function, particularly in the heart. Both excessively high (hyperkalemia) and low (hypokalemia) potassium levels can cause dangerous arrhythmias, leading to cardiac arrest. Therefore, maintaining potassium balance through dialysis and dietary management is vital for preventing life-threatening heart complications in dialysis patients.

What is the primary purpose of sodium profiling during dialysis?

Answer: To stabilize blood pressure

Sodium profiling involves gradually decreasing the sodium concentration in the dialysate during treatment. This technique helps to prevent rapid shifts in fluid and electrolyte balance, which can cause intradialytic hypotension (low blood pressure) and muscle cramps. By stabilizing blood pressure, it improves patient tolerance and reduces adverse events during dialysis.

Low calcium levels during dialysis may lead to which condition?

Answer: Muscle cramps

Calcium plays a vital role in muscle contraction and nerve function. Low calcium levels (hypocalcemia) during dialysis, often due to rapid calcium removal or electrolyte shifts, can lead to painful muscle cramps, particularly in the legs. Monitoring calcium and adjusting dialysate or administering calcium can help alleviate this common symptom.

Which electrolyte imbalance can result in confusion, seizures, or coma?

Answer: Hyponatremia

Hyponatremia, or low sodium levels in the blood, can cause water to shift into brain cells, leading to cerebral edema. This swelling can manifest as severe neurological symptoms ranging from confusion and lethargy to seizures and coma. It is a serious electrolyte imbalance requiring careful and immediate management in dialysis patients.

What lab value is used to monitor phosphate levels in dialysis patients?

Answer: Phosphorus

Phosphorus is the specific lab value used to monitor phosphate levels in dialysis patients. In kidney failure, the kidneys cannot adequately excrete phosphate, leading to hyperphosphatemia. High phosphorus levels contribute to bone disease and cardiovascular complications, so monitoring phosphorus is essential for managing mineral and bone disorder in dialysis patients.

Which hormone helps regulate calcium and phosphate in dialysis patients?

Answer: Parathyroid hormone (PTH)

Parathyroid hormone (PTH) is the primary hormone responsible for regulating calcium and phosphate levels in the body. In kidney disease, dysfunctional kidneys lead to low calcium and high phosphate, which stimulates the parathyroid glands to produce excessive PTH (secondary hyperparathyroidism). Monitoring PTH is crucial for managing bone and mineral disorders in dialysis patients.

What symptom is associated with hyperkalemia?

Answer: Muscle weakness

Hyperkalemia (high potassium) can disrupt the electrical signals in muscle cells, leading to muscle weakness, fatigue, and even paralysis. More dangerously, it can severely impair cardiac muscle function, causing life-threatening arrhythmias. Therefore, muscle weakness is a significant symptom indicating dangerously high potassium levels that require immediate attention.

Which electrolyte can accumulate due to poor phosphate binder adherence?

Answer: Phosphorus

Phosphate binders are medications taken with meals to prevent the absorption of dietary phosphorus. If a patient does not adhere to their phosphate binder regimen, phosphorus from food will be absorbed and accumulate in the blood, leading to hyperphosphatemia. This can cause severe bone and cardiovascular complications, highlighting the importance of adherence.