Type of fluid replacement used to prevent and treat dehydration
Oral rehydration therapy
|
---|
An oral rehydration solution (250ml) prepared according to WHO formula.
|
Other names
| oral rehydration solution (ORS), oral rehydration salts (ORS), glucose-salt solution
|
---|
|
Oral rehydration therapy
(
ORT
) is a type of
fluid replacement
used to prevent and treat
dehydration
, especially due to
diarrhea
.
[1]
It involves drinking water with modest amounts of sugar and salts, specifically
sodium
and
potassium
.
[1]
Oral rehydration therapy can also be given by a
nasogastric tube
.
[1]
Therapy can include the use of
zinc supplements
to reduce the duration of diarrhea in infants and children under the age of 5.
[1]
Use of oral rehydration therapy has been estimated to decrease the risk of death from diarrhea by up to 93%.
[2]
Side effects may include
vomiting
,
high blood sodium
, or
high blood potassium
.
[1]
If vomiting occurs, it is recommended that use be paused for 10 minutes and then gradually restarted.
[1]
The recommended formulation includes
sodium chloride
,
sodium citrate
,
potassium chloride
, and
glucose
.
[1]
Glucose may be replaced by
sucrose
and sodium citrate may be replaced by
sodium bicarbonate
, if not available, although the resulting mixture is not shelf stable in high-humidity environments.
[1]
[3]
It works as glucose increases the uptake of sodium and thus water by the
intestines
, and the potassium chloride and sodium citrate help prevent
hypokalemia
and
acidosis
, respectively, which are both common side effects of diarrhea.
[4]
[3]
[5]
A number of other formulations are also available including versions that can be made at home.
[4]
[2]
However, the use of homemade solutions has not been well studied.
[2]
Oral rehydration therapy was developed in the 1940s using electrolyte solutions with or without glucose on an empirical basis chiefly for mild or convalescent patients, but did not come into common use for rehydration and maintenance therapy until after the discovery that glucose promoted sodium and water absorption during cholera in the 1960s.
[6]
It is on the
World Health Organization's List of Essential Medicines
.
[7]
Globally, as of 2015
[update]
, oral rehydration therapy is used by 41% of children with diarrhea.
[8]
This use has played an important role in reducing the
number of deaths in children under the age of five
.
[8]
Medical uses
[
edit
]
ORT is less invasive than the other strategies for fluid replacement, specifically
intravenous
(IV) fluid replacement. Mild to moderate dehydration in children seen in an
emergency department
is best treated with ORT. Persons taking ORT should eat within six hours and return to their full diet within 24?48 hours.
[9]
Oral rehydration therapy may also be used as a treatment for the symptoms of
dehydration
and rehydration in
burns
in resource-limited settings.
[10]
Efficacy
[
edit
]
ORT may lower the mortality rate of diarrhea by as much as 93%.
[2]
Case studies in four developing countries also have demonstrated an association between increased use of ORS and reduction in mortality.
[11]
ORT using the original ORS formula has no effect on the duration of the diarrheic episode or the volume of fluid loss,
[12]
although reduced osmolarity solutions have been shown to reduce stool volume.
[13]
Treatment algorithm
[
edit
]
The degree of dehydration should be assessed before initiating ORT. ORT is suitable for people who are not dehydrated and those who show signs and symptoms of mild to moderate dehydration. People who have severe dehydration should seek professional medical help immediately and receive intravenous rehydration as soon as possible to rapidly replenish fluid volume in the body.
[14]
Contraindications
[
edit
]
ORT should be discontinued and fluids replaced intravenously when vomiting is protracted despite proper administration of ORT; or signs of dehydration worsen despite giving ORT; or the person is unable to drink due to a decreased level of consciousness; or there is evidence of intestinal blockage or
ileus
. ORT might also be contraindicated in people who are in hemodynamic shock due to impaired airway protective reflexes.
[15]
Short-term vomiting is not a contraindication to receiving oral rehydration therapy. In persons who are vomiting, drinking oral rehydration solution at a slow and continuous pace will help resolve vomiting.
[9]
Preparation
[
edit
]
WHO
and
UNICEF
have jointly developed official guidelines for the manufacture of oral rehydration solution and the oral rehydration salts used to make it (both often abbreviated
ORS
). They also describe other acceptable solutions, depending on material availability. Commercial preparations are available as prepared fluids and as packets of powder ready to mix with water.
[16]
[17]
A basic oral rehydration therapy solution can also be prepared when packets of oral rehydration salts are not available.
[18]
[19]
The
molar
ratio
of sugar to salt should be 1:1 and the solution should not be
hyperosmolar
.
[20]
The Rehydration Project states, "Making the mixture a little diluted (with more than 1 litre of clean water) is not harmful."
[21]
The optimal fluid for preparing oral rehydration solution is clean water. However, if this is not available, the usually available water should be used. Oral rehydration solution should
not
be withheld simply because the available water is potentially unsafe; rehydration takes precedence.
[22]
When oral rehydration salts packets and suitable teaspoons for measuring sugar and salt are not available, the WHO has recommended that homemade gruels, soups, etc., may be considered to help maintain hydration.
[23]
A Lancet review in 2013 emphasized the need for more research on appropriate home made fluids to prevent dehydration.
[24]
Sports drinks
are not optimal oral rehydration solutions, but they can be used if optimal choices are not available. They should not be withheld for lack of better options; again, rehydration takes precedence. But they are not replacements for oral rehydration solutions in nonemergency situations.
[25]
Reduced-osmolarity
[
edit
]
In 2003, WHO and UNICEF recommended that the
osmolarity
of oral rehydration solution be reduced from 311 to 245 mOsm/L.
[26]
[27]
These guidelines were also updated in 2006. This recommendation was based on multiple clinical trials showing that the reduced osmolarity solution reduces stool volume in children with diarrhea by about twenty-five percent and the need for IV therapy by about thirty percent when compared to standard oral rehydration solution. The incidence of vomiting is also reduced. The reduced osmolarity oral rehydration solution has lower concentrations of glucose and sodium chloride than the original solution, but the concentrations of potassium and
citrate
are unchanged.
[28]
[13]
[29]
[30]
The reduced osmolarity solution has been criticized by some for not providing enough sodium for adults with cholera.
[31]
Clinical trials have, however, shown reduced osmolarity solution to be effective for adults and children with cholera.
[30]
They seem to be safe but some caution is warranted according to the
Cochrane review
.
[30]
Formula for the WHO standard and low-osmolar-oral rehydration solution
[28]
[32]
Component
|
Standard
|
Low-osmolar
|
grams/L
|
oz/L
|
grams/L
|
oz/L
|
NaCl (salt)
|
3.5
|
0.123
|
2.6
|
0.092
|
Trisodium citrate
dihydrate
|
2.9
|
0.100
|
2.9
|
0.100
|
KCl (NoSalt)
|
1.5
|
0.053
|
1.5
|
0.053
|
Anhydrous
glucose
|
20
|
0.705
|
13.5
|
0.480
|
Total
|
27.9
|
0.981
|
20.5
|
0.725
|
Molar composition for the WHO standard and low-osmolar-oral rehydration solution
[28]
[32]
Component
|
Standard
|
Low-osmolar
|
Acceptable range
|
mmol
/L
|
mmol
/L
|
mmol
/L
|
Glucose
|
111
|
75
|
<111
|
Sodium
|
90
|
75
|
60?90
|
Potassium
|
20
|
20
|
15?25
|
Chloride
|
80
|
65
|
50?80
|
Citrate
|
10
|
10
|
8?12
|
Total
|
311
|
245
|
200?310
|
Administration
[
edit
]
ORT is based on evidence that water continues to be absorbed from the
gastrointestinal tract
even while fluid is lost through diarrhea or vomiting. The
World Health Organization
specify indications, preparations and procedures for ORT.
[22]
WHO/UNICEF guidelines suggest ORT should begin at the first sign of diarrhea in order to prevent dehydration.
[28]
[33]
Babies may be given ORS with a dropper or a syringe. Infants under two may be given a teaspoon of ORS fluid every one to two minutes. Older children and adults should take frequent sips from a cup, with a recommended intake of 200?400 mL of solution after every loose movement.
[1]
The WHO recommends giving children under two a quarter- to a half-cup of fluid following each loose
bowel movement
and older children a half- to a full cup. If the person vomits, the caregiver should wait 5?10 minutes and then resume giving ORS.
[22]
: Section 4.2
ORS may be given by
aid workers
or health care workers in
refugee
camps, health clinics and hospital settings.
[34]
Mothers should remain with their children and be taught how to give ORS. This will help to prepare them to give ORT at home in the future. Breastfeeding should be continued throughout ORT.
[22]
Associated therapies
[
edit
]
Zinc
[
edit
]
As part of oral rehydration therapy, the WHO recommends supplemental zinc (10 to 20 mg daily) for ten to fourteen days, to reduce the severity and duration of the illness and make recurrent illness in the following two to three months less likely. Preparations are available as a
zinc sulfate
solution for adults, a modified solution for children and in tablet form.
[35]
Feeding
[
edit
]
After severe dehydration is corrected and appetite returns, feeding the person speeds the recovery of normal intestinal function, minimizes weight loss and supports continued growth in children. Small frequent meals are best tolerated (offering the child food every three to four hours). Mothers should continue to
breastfeed
.
[22]
[11]
[36]
A child with watery diarrhea typically regains their appetite as soon as dehydration is corrected, whereas a child with bloody diarrhea often eats poorly until the illness resolves. Such children should be encouraged to resume normal feeding as soon as possible. Once diarrhea is corrected, the WHO recommends giving the child an extra meal each day for two weeks, and longer if the child is malnourished.
[22]
Children with malnutrition
[
edit
]
Dehydration may be overestimated in
wasted
children and underestimated in
edematous
children.
[37]
Care of these children must also include careful management of their
malnutrition
and treatment of other infections. Useful signs of dehydration include an eagerness to drink, lethargy, cool and moist extremities, weak or absent
radial pulse
(wrist), and reduced or absent
urine
flow. In children with severe malnutrition, it is often impossible to reliably distinguish between moderate and severe dehydration. A severely malnourished child who has signs of severe dehydration but who does not have a history of watery diarrhea should be treated for
septic shock
.
[22]
The original ORS (90 mmol sodium/L) and the current standard reduced-osmolarity ORS (75 mmol sodium/L) both contain too much sodium and too little potassium for severely malnourished children with dehydration due to diarrhea. ReSoMal (
Re
hydration
So
lution for
Mal
nutrition) is recommended for such children. It contains less sodium (45 mmol/L) and more potassium (40 mmol/L) than reduced osmolarity ORS.
[38]
It can be obtained in packets produced by UNICEF or other manufacturers.
[
citation needed
]
An exception is if the severely malnourished child also has severe diarrhea (in which case ReSoMal may not provide enough sodium), in which case standard reduced-osmolarity ORS (75 mmol sodium/L) is recommended.
[22]
Malnourished children should be rehydrated slowly. The WHO recommends 10 milliliters of ReSoMal per kilogram body weight for each of the first two hours (for example, a 9-kilogram child should be given 90 mL of ReSoMal over the course of the first hour, and another 90 mL for the second hour) and then continuing at this same rate or slower based on the child's thirst and ongoing stool losses, keeping in mind that a severely dehydrated child may be lethargic. If the child drinks poorly, a nasogastric tube should be used. The IV route should not be used for rehydration except in cases of shock and then only with care, infusing slowly to avoid flooding the circulation and overloading the heart.
[22]
Feeding should usually resume within 2?3 hours after starting rehydration and should continue every 2?3 hours, day and night. For an initial cereal diet before a child regains his or her full appetite, the WHO recommends combining 25 grams skimmed milk powder, 20 grams vegetable oil, 60 grams sugar, and 60 grams rice powder or other cereal into 1,000 milliliters water and boiling gently for five minutes. Give 130 mL per kilogram of body weight during per 24 hours. A child who cannot or will not eat this minimum amount should be given the diet by nasogastric tube divided into six equal feedings. Later on, the child should be given cereal made with a greater amount of skimmed milk product and vegetable oil and slightly less sugar. As appetite fully returns, the child should be eating 200 mL per kilogram of body weight per day. Zinc, potassium, vitamin A, and other vitamins and minerals should be added to both recommended cereal products, or to the oral rehydration solution itself. Children who are breastfed should continue breastfeeding.
[22]
Antibiotics
[
edit
]
The WHO recommends that all severely malnourished children admitted to hospital should receive
broad-spectrum antibiotics
(for example,
gentamicin
and
ampicillin
). In addition, hospitalized children should be checked daily for other specific infections.
[22]
If cholera is suspected give an antibiotic to which
V. cholera
e are susceptible. This reduces the volume loss due to diarrhea by 50% and shortens the duration of diarrhea to about 48 hours.
[39]
Physiological basis
[
edit
]
Fluid from the body enters the
intestinal
lumen
during
digestion
. This fluid is
isosmotic
with the blood and contains a high quantity, about 142 mEq/L, of
sodium
. A healthy individual secretes 2000?3000 milligrams of sodium per day into the intestinal lumen. Nearly all of this is reabsorbed so that sodium levels in the body
remain constant
. In a diarrheal illness, sodium-rich intestinal secretions are lost before they can be reabsorbed. This can lead to life-threatening
dehydration
or
electrolyte imbalances
within hours when fluid loss is severe. The objective of therapy is the replenishment of sodium and water losses by ORT or intravenous infusion.
Sodium absorption occurs in two stages. The first is via intestinal
epithelial
cells (
enterocytes
). Sodium passes into these cells by
co-transport
with glucose, via the
SGLT1
protein. From the intestinal epithelial cells, sodium is pumped by
active transport
via the
sodium-potassium pump
through the
basolateral cell membrane
into the
extracellular space
.
[42]
The
sodium?potassium ATPase pump
at the basolateral
cell membrane
moves three sodium ions into the extracellular space, while pulling into the enterocyte two
potassium
ions. This creates a "downhill" sodium
gradient
within the cell.
SGLT proteins
use energy from this downhill sodium gradient to transport
glucose
across the
apical membrane
of the cell against the glucose gradient. The co-transporters are examples of
secondary active transport
. The GLUT
uniporters
then transport glucose across the basolateral membrane. Both SGLT1 and SGLT2 are known as
symporters
, since both sodium and glucose are transported in the same direction across the membrane.
[
citation needed
]
The co-transport of glucose into epithelial cells via the
SGLT1
protein requires sodium. Two sodium ions and one molecule of glucose (or
galactose
) are transported together across the
cell membrane
via the SGLT1 protein. Without glucose, intestinal sodium is not absorbed. This is why oral rehydration salts include both sodium and glucose. For each cycle of the transport, hundreds of water molecules move into the epithelial cell to maintain osmotic equilibrium. The resultant absorption of sodium and water can achieve rehydration even while diarrhea continues.
History
[
edit
]
Definition
[
edit
]
In the early 1980s, "oral rehydration therapy" meant only the preparation prescribed by the
World Health Organization
(WHO) and
UNICEF
. In 1988, the definition was changed to include recommended home-made solutions, because the official preparation was not always available. The definition was also amended in 1988, to include continued feeding as associated therapy. In 1991, the definition became "an increase in administered
hydrational fluids
"; in 1993, "an increase in administered fluids and continued feeding".
[34]
Development
[
edit
]
Dehydration was a major cause of death during the 1829
cholera
pandemic in Russia and Western Europe. In 1831,
William Brooke O'Shaughnessy
noted the changes in blood composition and loss of water and salt in the stool of people with cholera and prescribed
intravenous fluid therapy
(IV fluids), first administered by Latta. The prescribing of
hypertonic
IV therapy by Rogers
[
who?
]
decreased the mortality rate of cholera to 40 percent, from 70. In the West, IV therapy became the "gold standard" for the treatment of moderate and severe dehydration.
[43]
In 1953,
Hemendra Nath Chatterjee
published in
The Lancet
the results of using ORT to treat people with mild cholera.
[44]
He gave the solution orally and rectally, along with Coleus extract, antihistimines, and antiemetics, without controls. The formula of the fluid replacement solution was 4 g of
sodium chloride
, 25 g of
glucose
, and 1000 mL of
water
.
[44]
[45]
He did not publish any balance data, and his exclusion of patients with severe dehydration did not lead to any confirming study; his report remained anecdotal.
[
citation needed
]
Robert Allan Phillips
tried to make an effective ORT solution based on his discovery that, in the presence of glucose, sodium and chloride could be absorbed in patients with cholera; but he failed because his solution was too hypertonic and he used it to try to stop the diarrhea rather than to rehydrate patients.
[
citation needed
]
In the early 1960s,
Robert K. Crane
described the
sodium-glucose co-transport mechanism
and its role in intestinal glucose absorption.
[46]
This, along with evidence that the intestinal
mucosa
appears undamaged in cholera, suggested that intestinal absorption of glucose and sodium might continue during the illness. This supported the notion that oral rehydration might be possible even during severe diarrhea due to cholera. In 1967?1968,
Norbert Hirschhorn
and Nathaniel F. Pierce showed that people with severe cholera can absorb glucose, salt, and water and that this can occur in sufficient amounts to maintain hydration.
[47]
[48]
In 1968,
David R. Nalin
and
Richard A. Cash
, helped by
Rafiqul Islam
and Majid Molla, reported that giving adults with cholera an oral glucose-electrolyte solution in volumes equal to those of the diarrhea losses reduced the need for IV fluid therapy by eighty percent.
[49]
[46]
In 1971, fighting during the
Bangladesh Liberation War
displaced millions and an epidemic of cholera ensued among the refugees. When IV fluid ran out in the
refugee camps
,
Dilip Mahalanabis
, a physician working with the Johns Hopkins International Center for Medical Research and Training in Calcutta, issued instructions to prepare an oral rehydration solution and to distribute it to family members and caregivers. Over 3,000 people with cholera received ORT in this way. The
mortality rate
was 3.6 percent among those given ORT, compared with 30 percent in those given IV fluid therapy.
[43]
[45]
After Bangladesh won independence, there was a wide campaign to promote the use of saline in the treatment of diarrhea. In 1980, the World Health Organization recognized ORT and began a global program for its dissemination.
[
citation needed
]
In the 1970s,
Norbert Hirschhorn
used oral rehydration therapy on the White River Apache Indian Reservation with a grant from the National Institute of Allergy and Infectious Diseases.
[50]
[51]
[52]
He observed that children voluntarily drank as much of the solution as needed to restore hydration, and that rehydration and early re-feeding would protect their nutrition. This led to increased use of ORT for children with diarrhea, especially in developing countries.
[
citation needed
]
In 1980, the Bangladeshi nonprofit BRAC created a door-to-door and person-to-person sales force to teach ORT for use by mothers at home. A
task force
of fourteen women, one cook and one male supervisor traveled from village to village. After visiting with women in several villages, they hit upon the idea of encouraging the women in the village to make their own oral rehydration fluid. They used available household equipment, starting with a "half a seer" (half a quart) of water and adding a fistful of sugar and a three-finger pinch of salt. Later on, the approach was broadcast over television and radio and a market for oral rehydration salts packets developed. Three decades later, national surveys have found that almost 90% of children with severe diarrhea in Bangladesh are given oral rehydration fluids at home or in a health facility.
[53]
ORT is known in Bangladesh as Orosaline or Orsaline.
[
citation needed
]
From 2006 to 2011, UNICEF estimated that worldwide about a third of children under 5 who had diarrhea received an oral rehydration solution, with estimates ranging from 30% to 41% depending on the region.
[54]
[55]
ORT is one of the principal elements of the UNICEF "GOBI FFF" program (growth monitoring; ORT; breast feeding; immunization; female education; family spacing and
food supplementation
). The program aims to increase child survival in developing nations through proven low-cost interventions.
[56]
Mozambique civil war refugees, 1990
[
edit
]
People had fled from
civil war
in
Mozambique
to southern
Malawi
. In November 1990, cholera broke out in a refugee camp in southern Malawi where approximately 74,000 persons were temporarily living. David Swerdlow of the U.S.'s CDC
Epidemic Intelligence Service
(EIS) wrote about the situation. He recommended setting up a tent just for children who would be assisted by some of the best nurses. He recommended against over-reliance on IV tubes, which often were left attached to persons for a week or more and which could lead to infections and septic shock. And he noticed that sick persons were not drinking enough rehydration solution. He assigned so-called "ORS officers" whose job was to encourage persons to drink more solution.
[57]
It was a minor mystery how persons were getting sick since deep-bore wells provided clean water and refugees were encouraged to wash their hands. It was then discovered that the only place for persons to wash hands were in the same buckets in which water was transported and stored. Swerdlow wrote in his report, "Use of narrow mouthed water containers would probably decrease the likelihood of contamination."
[57]
Awards
[
edit
]
- Centre for Health and Population Research
,
Dhaka
,
Bangladesh
, 2001 Gates award for global health.
[58]
- Norbert Hirschhorn
,
Dilip Mahalanabis
,
David Nalin
, and Nathaniel Pierce, 2002 inaugural
Pollin Prize for Pediatric Research
.
[59]
- Richard A. Cash
,
David Nalin
,
Dilip Mahalanabis
and
Stanley Schultz
, 2006
Prince Mahidol Award
.
[60]
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[
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]
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c
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e
f
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h
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