Claire Dawson
Dehydration is a condition that occurs when the body does not have enough water. Dehydration can be caused by various factors, including vomiting, diarrhea, fever, exercise, spending time in the heat, and certain medical conditions. It can lead to a range of symptoms, from dry skin and lips to more severe issues such as loss of consciousness or even death. Hospitals administer fluids for dehydration through intravenous (IV) therapy, which is a common procedure with over 90% of hospitalized patients receiving IV fluids as part of their care. IV fluids are specially formulated liquids injected into a vein to prevent or treat dehydration, and they come in various forms, including crystalloid and colloid solutions. These fluids help restore intravascular volume, maintain hydration, and support blood pressure and peripheral perfusion. The type and amount of fluid administered depend on several factors, including the patient's weight, age, and medical condition. While IV rehydration is generally safe, it is not without risks or side effects, and it is important to carefully consider the credentials and training of the team administering them.
| Characteristics | Values |
|---|---|
| Purpose | To prevent or treat dehydration |
| Recipients | People of all ages who are sick, injured, dehydrated from exercise or heat, or undergoing surgery |
| Types | Crystalloid solutions (e.g. normal saline, D5W, lactated Ringer's), colloid solutions (e.g. albumin, plasma, gelatin or starch solutions) |
| Administration | Intravenously (IV), nasogastric (NG) feeding |
| Effects | Quick recovery, improved hydration, balanced electrolyte and blood sugar levels |
| Considerations | Weight, age, medical conditions, urine output, serum sodium concentrations |
| Risks | Fluid congestion in areas like the lungs, especially with heart failure or kidney disease |
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What You'll Learn
To restore intravascular volume and support blood pressure
Dehydration can be life-threatening, and in severe cases, it is a medical emergency that requires immediate treatment. When the body is dehydrated, it compensates for the loss of fluid by increasing the heart rate and blood pressure to maintain adequate blood flow to organs. However, this can only go on for so long, and eventually, the cardiovascular system can no longer compensate for the fluid loss, leading to hypotension and tachycardia.
Hospitals use intravenous (IV) therapy to administer fluids directly into the patient's veins. This method is incredibly effective and ensures rapid delivery of fluids to the patient. The type and amount of fluid administered depend on several factors, including the patient's weight, age, and medical condition. For example, a child with 10% dehydration and a normal serum sodium level will be treated differently from a child with a serum sodium level outside the range of 135 to 145 mEq/L.
The initial goal of treating dehydration is to restore intravascular volume, also known as the resuscitative phase. This is typically done with a 0.9% saline solution, which is a crystalloid solution that contains small, dissolved molecules that can easily pass from the bloodstream into tissues and cells. Saline solutions are preferred because they ensure that the administered fluid remains in the extracellular (intravascular) compartment, providing the most effective support for blood pressure and peripheral perfusion.
In cases of incipient shock, therapy may begin with a rapid bolus of 0.9% saline. However, correction of dehydration must be accompanied by the provision of maintenance fluids to account for ongoing fluid losses. Maintenance fluids are typically given as D5NS, which can include potassium depending on the patient's urine output. If the patient is only correcting dehydration, 0.9% saline is used, whereas D5NS with 20 mEq/L KCl is used if providing fluid only.
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To prevent dehydration in older adults and infants
Dehydration can be a serious problem for older adults and infants, who are more at risk than other age groups. In serious cases, dehydration can even be dangerous or life-threatening. Therefore, it is important to prevent dehydration in these groups by increasing their water intake.
Older Adults
Older adults are more prone to dehydration for several reasons. Firstly, their bodies do not regulate temperature as efficiently as younger people, so they are more likely to become dehydrated through sweating. Secondly, their appetite and thirst tend to diminish with age, meaning they may not be aware of their body's need for fluids and may not drink enough. Finally, body composition changes over time mean that older adults have less water in their bodies to begin with. As a result, seniors are vulnerable to dehydration, which can lead to mild or severe health complications, including urinary tract infections (UTIs), heat stroke, heart problems, kidney failure, and blood clot complications.
To prevent dehydration, older adults should drink more water throughout the day. It is recommended that older adults drink around 9-13 cups of water per day, or one-third of their body weight in ounces. They can also increase their fluid intake by consuming foods with a high water content, such as watermelon, cucumber, celery, strawberries, and low-sodium broths or soups.
Infants
Infants are at risk of dehydration because they are on a purely liquid diet for the first few months of life, and their small stomachs can only hold a small amount of milk at a time. They may also become dehydrated if they are unwell with the flu, stomach viruses, or food intolerances. In addition, newborns may become dehydrated if breast milk does not have the right balance of water and salts, although this is rare.
To prevent dehydration in infants, it is important to ensure they are fed regularly and are taking in enough milk. Newborns will need about nine feedings in a 24-hour period. If a newborn is unable to breastfeed or the mother is not producing enough milk, there are other ways to deliver milk, such as with a bottle. If an infant is unable to suck from the breast or a bottle, or is vomiting frequently, a doctor should be consulted immediately.
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To treat those fainting or experiencing heat stroke
Dehydration is a condition where the body loses so much fluid that it cannot function normally. This can happen due to several reasons, including fever, diarrhoea, vomiting, overexposure to the sun, or certain medications. Dehydration can lead to severe health issues, especially in children and the elderly, and can even be life-threatening if left untreated.
Fainting or syncope can occur due to mild or moderate dehydration. When the body is dehydrated, it tries to compensate for the fluid loss by increasing heart rate and blood pressure to maintain adequate blood flow to vital organs. This can lead to a temporary decrease in blood flow to the brain, resulting in lightheadedness and fainting. In such cases, intravenous (IV) fluid administration is often necessary to rapidly restore fluid levels and prevent further complications.
Heat stroke is another life-threatening condition that can result from severe dehydration. It occurs when the body is exposed to extreme heat and cannot cool itself through sweating, causing a dangerous rise in internal temperature. Heat stroke requires immediate medical attention as it can lead to permanent damage or death. While waiting for emergency services, it is crucial to move the affected individual to a shaded area, remove their clothing, and apply cool water to their skin, followed by fanning to induce sweating.
In a hospital setting, individuals experiencing heat stroke and exhibiting symptoms of dehydration, such as fainting, will be administered IV fluids to compensate for fluid and electrolyte loss. This rapid delivery of fluids directly into the veins helps to cool the body, stabilize vital signs, and prevent further harm. It is a crucial step in the treatment of heat stroke and dehydration-induced fainting, as it addresses the underlying fluid imbalance and supports the body's natural cooling mechanisms.
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To replace fluid loss from vomiting, diarrhoea, surgery, or burns
Dehydration is a condition where the body loses so much fluid that it can no longer function normally. Water is essential to every cell in our bodies, with our bodies being made up of about 60% water. Even a 1% to 2% fluid loss can alter memory and cognitive abilities, while dehydration of 8% or more can lead to loss of consciousness or even death.
Hospitals use intravenous (IV) fluids to treat dehydration. IV fluids are liquids injected into a vein to prevent or treat dehydration and electrolyte imbalances. They are used in people of all ages who are sick, injured, dehydrated from exercise or heat, or undergoing surgery.
IV rehydration is a simple, safe, and common procedure with a low risk of complications. However, too much, too little, or the wrong type of fluid can lead to complications. Fluid management requires careful consideration, and clinicians should generally avoid hypotonic solutions in patients with hyponatremia due to the risk of cerebral edema.
IV fluids are often used as emergency therapy for older adults, as they are at higher risk of dehydration due to inadequate water intake and medical conditions. Dehydration can also be caused by vomiting, diarrhoea, surgery, or burns, which can result in significant fluid loss. In these cases, IV fluids are used to replace the lost fluids and prevent further complications.
For example, a patient with extensive burns will experience significant fluid loss and require aggressive fluid replacement. Similarly, a patient with dehydration due to diarrhoea may require a different fluid composition than a patient in hypovolemic shock from a gastrointestinal bleed.
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To maintain hydration during surgery
Intravenous (IV) fluids are used to maintain hydration during surgery. IV therapy is a common procedure, with over 90% of hospitalized patients receiving IV fluids as part of their care. It involves the delivery of fluids, blood, or medication directly into a patient's veins. This method is highly effective for patients who require rapid drug administration or other IV fluids.
IV fluids are essential for preventing or treating dehydration, especially when a patient is unable to drink liquids during surgery. Dehydration can occur due to various factors, including vomiting, diarrhea, excessive exercise, exposure to heat, serious injuries, or burns. In such cases, IV rehydration is a simple, safe, and common procedure with a low risk of complications.
During surgery, maintaining adequate hydration is crucial for several reasons. Firstly, dehydration can compromise tissue oxygenation and circulation. Proper fluid management helps maintain fluid balance and supports the functioning of vital organs and systems. Additionally, dehydration can lead to increased heart rate and blood pressure as the body compensates for fluid loss to maintain adequate blood flow to the organs.
IV fluids also play a crucial role in maintaining electrolyte and blood sugar levels during surgery. Electrolytes are essential for cognitive performance, energy levels, gastrointestinal function, and the proper functioning of organs such as the kidneys, heart, and brain. Imbalances in electrolytes and blood sugar can have detrimental effects on the body.
In addition to hydration, IV fluids can also be used to administer anesthesia, pain medications, antibiotics, and other necessary medications during surgery. This dual function of IV therapy ensures that patients receive the necessary fluids while also receiving vital medications.
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Frequently asked questions
Hospitals use intravenous (IV) fluids to treat dehydration as they are absorbed quickly and speed up recovery. IV fluids are liquids injected directly into a vein, bypassing the digestive system and delivering fluids directly to the bloodstream.
IV fluid administration is necessary when a person is dangerously dehydrated and requires immediate fluid replacement. This could be due to vomiting, diarrhea, fever, surgery, injury, or heat stroke.
While IV rehydration is generally considered safe, there are some risks and side effects to be aware of. These include fluid congestion in areas like the lungs, especially in individuals with heart failure or kidney disease. It is important to carefully consider the type and amount of fluid administered, as too much or too little can lead to complications.
