What is a fluid and electrolyte imbalance?
A fluid and electrolyte imbalance is a disruption in the ratio between electrolyte concentration and water in the body. It is known that myocardial and neurological functions, acid-base balance, cellular fluid-electrolyte function, and oxygen supply are strongly regulated by electrolyte levels. An imbalance in water and minerals can therefore lead to various symptoms, such as cardiac or neurological complications.
What are electrolytes and what is their role in the body?
Role of electrolytes in the body
Electrolytes have several vital functions in your body, including:
->transmission of nerve impulses,
->maintaining the balance between internal and external fluids of cells,
->acid-base balance,
->maintaining a stable blood pH,
->contributing to proper muscle function,
->contributing to proper kidney function and waste excretion.
Main electrolytes and their functions
The main electrolytes are sodium, potassium, calcium, magnesium, chloride, bicarbonate, and phosphate.
|
Sodium |
Responsible for maintaining osmolarity. Contributes to water distribution between intracellular and extracellular compartments. Role in pH regulation, kidney function, and nerve transmission. |
|
Potassium |
Role in muscle contraction and proper nervous system function. |
|
Calcium |
Participates in skeletal mineralization, muscle contraction, and blood clotting. |
|
Magnesium |
Essential for proper absorption and utilization of calcium by the body. Necessary for bone and tooth formation, as well as normal nerve and muscle function. Helps reduce physical and mental fatigue. |
|
Chloride |
Role in fluid balance and maintaining the body's pH level. |
|
Bicarbonate |
Helps maintain acid-base balance. |
|
Phosphate |
Very important for strong teeth and bones: 85% of total body phosphorus is found in bones and teeth. Also contributes to energy production and maintaining intracellular acid-base balance. |
What are the symptoms of a fluid and electrolyte imbalance?
General symptoms
Some signs are present regardless of the type of electrolyte imbalance concerned. Among these symptoms, you may experience headaches, general fatigue, nausea, and vomiting. You may also have muscle cramps, spasms, dizziness or lightheadedness, as well as concentration problems.
Specific symptoms depending on the type of imbalance
|
Sodium too low (<135 mmol/L) |
Lethargy, altered mental status, seizures, coma Elderly: gait disorders, increased fracture rates |
|
|
Hypernatremia |
Sodium too high (>145 mmol/L) |
Thirst, behavioral changes, irritability, muscle weakness |
|
Hypokalemia |
Potassium too low (<3.5 mmol/L) |
Muscle weakness and cramps, paralysis, abnormal heart rhythm |
|
Hyperkalemia |
Potassium too high (>5.0 mmol/L) |
Abdominal and chest pain, diarrhea, vomiting, heart palpitations, muscle weakness, limb numbness |
What are the causes of fluid and electrolyte imbalances?
Several factors can cause these disorders.
Firstly, excessive fluid loss (especially water) can be the main cause. These excessive losses are usually due to diarrhea, vomiting, excessive sweating, hemorrhage, or extensive burns.
Secondly, there is insufficient mineral intake through an unbalanced and deficient diet, possibly also due to prolonged fasting or poor hydration habits. This is the case, for example, during intense exercise, where the human body loses water through perspiration (99%) but also minerals present in sweat, such as sodium.
Certain diseases can also be the cause, such as hormonal or chronic diseases like kidney failure, diabetes, diuretic use, or other medicinal treatments.
How to treat a fluid and electrolyte imbalance?
Treatment depends on the severity and type of imbalance identified. We recommend in all cases that you consult a healthcare professional who will best guide you.
Nevertheless, hydration will play an important role. Indeed, water intake alone may sometimes be sufficient, but in most cases, it is preferable to choose a solution containing electrolytes.
Reviewing your diet is essential, meaning you should regularly consume fruits, vegetables, dried fruits, dairy products, or legumes, which will help restore sufficient intake. These are foods naturally rich in potassium (banana, avocado), calcium (dairy products), magnesium (nuts, legumes), and sodium (salt, mineralized water).
In case of persistent symptoms, hospital care may be necessary to avoid neurological or cardiac complications.
How to prevent a fluid and electrolyte imbalance?
Adopt a balanced diet
Incorporate mineral-rich foods daily. Also, be sure to vary your intake according to your energy expenditure and climatic conditions.
Anticipate physical exertion
Before, during, and after intense activity, hydrate regularly with solutions containing electrolytes, especially in cases of heavy sweating. After physical exertion, it is recommended to consume 1.5 times your weight loss! So if you lose 2 kg, we recommend consuming about 2 x 1.5 or 3 liters of recovery drink, electrolytes, and water after exercise. Always without exceeding 1 liter of water per hour to avoid overloading your digestive system!
Monitor your health status
Elderly individuals, children, and patients undergoing chronic treatment should undergo regular medical monitoring, including an electrolyte assessment if necessary.
What are the average levels to avoid fluid and electrolyte imbalances?
Reference values for electrolytes:
|
Electrolytes |
Blood value |
Daily intake for an average adult |
|
Sodium |
135 to 145 mmol/L |
1500 mg |
|
Potassium |
3.5 to 5.0 mmol/L |
3500 mg |
|
Calcium |
2.1 to 2.6 mmol/L |
1000 mg |
|
Magnesium |
0.7 to 1.0 mmol/L |
375 mg |
Importance of maintaining these levels within optimal ranges to avoid disorders
These blood values indicate the ideal internal balance for proper cellular function. The RDAs, on the other hand, represent the necessary dietary intake to cover physiological needs and compensate for daily losses. A diet too poor in minerals or excessive losses (sweat, diarrhea, etc.) that are not compensated can lead to potentially serious imbalances. This is why it is essential to maintain these levels in a good balance.
How to correct a fluid and electrolyte imbalance?
Correcting it relies on an approach adapted to the nature of the imbalance (deficiency or excess), its severity, the identified cause, and the patient's clinical state. Correction can occur at several levels, including urgent medical intervention, adjustment of dietary intake, and above all, functional and targeted hydration.
Rapid rebalancing
In acute or severe situations (disorientation, seizures, arrhythmias), urgent correction is necessary. This is usually done in a medical setting, via infusions containing specific electrolytes. The choice of infusion depends on the results of blood tests, the type of disorder, and the speed of its development.
The goal is to avoid any neurological or cardiac complications, while correcting the imbalance progressively to prevent a rebound effect. In some cases, hospitalization in intensive care may be necessary, especially when an imbalance affects several electrolytes simultaneously.
Regular consumption of electrolyte-rich foods
Outside of acute cases, these imbalances can often be corrected by an adapted diet, rich in minerals:
Potassium: found in bananas, avocados, potatoes, legumes, dried fruits.
Sodium: provided by salt (in reasonable amounts), mineralized waters, certain cheeses.
Calcium: found in dairy products, sardines with bones, almonds.
Magnesium: abundant in oilseeds (walnuts, almonds), whole grains, dark chocolate, green vegetables.
These foods help to gradually compensate for losses, especially if they are linked to excessive sweating, a deficient diet or a very active lifestyle. Supplementation via food supplements or specific products can also be considered in the event of proven deficiency, under medical supervision.
Targeted hydration
Hydration is an important element in correcting hydro-electrolytic disorders. But be careful, drinking water alone may not be enough, or may even worsen certain imbalances (such as hyponatremia) if electrolyte losses are not compensated.
It is therefore crucial to favor optimized hydration, based on solutions containing sodium, potassium, magnesium, and glucose. Glucose will promote the active absorption of sodium in the intestine via the SGLT1 co-transporter, which will improve overall hydration. This principle is based on oral rehydration solutions (ORS) recommended by the WHO for infants with diarrhea and vomiting.
These drinks are particularly indicated:
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After prolonged physical activity, especially in hot weather;
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In case of fever, diarrhea, vomiting or excessive sweating;
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During post-operative convalescence or after an episode of dehydration.
How to identify an electrolyte imbalance?
The signs of an electrolyte imbalance can vary depending on the electrolyte concerned, but some symptoms are common to all. Indeed, you may experience fatigue, headaches, nausea, vomiting, and mental confusion.
These symptoms can appear gradually or suddenly and vary in intensity depending on the severity of the imbalance.
To confirm or rule out electrolyte imbalance, a blood test called an "ionogram" measures the concentrations of the main electrolytes in the blood.
At the slightest doubt, we recommend that you consult a doctor. Only they can make a reliable diagnosis and determine the course of action.
In conclusion, a hydro-electrolytic imbalance can occur when electrolyte concentrations, such as sodium and potassium, are abnormal. The reasons and symptoms can vary, ranging from headaches and vomiting to muscular and cardiac complications. To prevent this disorder, a varied diet is necessary, and a medical consultation should be carried out in case of doubt.
Bibliography
Larson, N. J., Rogers, F. B., Feeken, J. L., Blondeau, B., & Dries, D. J. (2024). Electrolyte Disorders: Causes, Diagnosis, and Initial Care-Part 1. Air medical journal, 43(2), 80–83. https://doi.org/10.1016/j.amj.2024.01.001
Larson, N. J., Rogers, F. B., Feeken, J. L., Blondeau, B., & Dries, D. J. (2024). Electrolyte Disorders: Causes, Diagnosis, and Initial Care-Part 2. Air medical journal, 43(3), 193–197. https://doi.org/10.1016/j.amj.2024.03.016
Larson, N. J., Rogers, F. B., Feeken, J. L., Blondeau, B., & Dries, D. J. (2024). Electrolyte Disorders: Causes, Diagnosis, and Initial Care-Part 3. Air medical journal, 43(4), 270–275. https://doi.org/10.1016/j.amj.2024.05.007
Rondon, H., & Badireddy, M. (2023). Hyponatremia. In StatPearls. StatPearls Publishing. https://www.ncbi.nlm.nih.gov/books/NBK470386/