Due to oliguria, the body cannot excrete potassium in a timely manner, leading to excessive potassium retention in the body and causing hyperkalemia. If the patient has hyperkalemia, a low-potassium diet should be administered. If the daily urine output is greater than 1000 ml or the blood potassium level is normal, there is no need to further restrict potassium intake. A potassium-restricted diet should avoid drinking fruit juice and should be cautious in selecting vegetables and fruits. If the patient's daily urine output increases and exceeds 1500 ml, the blood potassium level should be monitored, and potassium supplementation may be necessary if it is too low.
The cantaloupe has a very high content of potassium ions. Due to the decreased glomerular filtration rate and reduced tubular function in patients with renal failure, the ability to handle potassium is impaired. Consuming high-potassium foods can cause bradycardia and may even lead to accidental situations. Therefore, patients with renal failure and oliguria should not eat cantaloupes. Bananas are also rich in potassium; according to tests, every 100 grams of banana contains 283-472 mg of potassium. Therefore, patients with renal failure and oliguria should also avoid eating bananas.
Acute renal failure can be divided into three stages according to its course of evolution: oliguric stage, diuretic stage, and recovery stage. Dietary therapy should adjust different nutrients according to the different manifestations of each clinical stage.
An individual with a 24-hour urine output of less than 400 ml is considered oliguric, and less than 50 ml is anuria. Both the oliguric and anuric stages require restriction of foods high in potassium. In the later stages of renal failure, potassium retention in the body may occur. During oliguria, the intake of potassium salts should be adjusted based on the presence or absence of hyperkalemia to avoid excessive exogenous potassium intake leading to hyperkalemia.
When blood potassium levels are elevated and urine output decreases (less than 1000 ml/day), it is necessary to appropriately restrict foods high in potassium, such as various dried goods (seaweed, mushrooms, dried dates, lily bulbs), most vegetables (cauliflower, rapeseed, etc.), fruits like oranges, bananas, and cantaloupes, as well as various meats, potatoes, and coarse grains. When urine output increases and blood potassium levels decrease, potassium should be supplemented accordingly.
Generally, when urine output is 1500-3000 ml/day, one can choose to consume foods high in potassium, such as lean meat, milk, eggs, potatoes, green leafy vegetables, tea, sunflower seeds, grains, bananas, cantaloupes, oranges, lemons, apricots, and plums. Generally, the supplementation of potassium salts should be adjusted in a timely manner according to blood potassium levels.