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Acid reflux)
Gastroesophageal reflux disease (GERD), Gastro-oesophageal
reflux disease (GORD), Gastric reflux disease, or Acid reflux disease is defined as chronic symptoms
or mucosal damage produced by the abnormal reflux in the esophagus.[1]
This is commonly due to transient or permanent changes in
the barrier between the esophagus and the stomach. This can be due to
incompetence of the lower
esophageal sphincter, transient lower esophageal sphincter relaxation, impaired expulsion of gastric reflux from the
esophagus, or a hiatal hernia. If the reflux
reaches the throat, it is called laryngopharyngeal reflux disease.
[edit] Signs and symptoms
[edit] Adults
The most-common symptoms of GERD
are:
Less-common symptoms include:
- Pain with
swallowing (odynophagia)
- Excessive salivation (this is common
during heartburn, as saliva is generally slightly basic[2] and is the body's natural response to heartburn, acting similarly
to an antacid)
- Nausea[3]
- Chest pain
GERD sometimes causes
injury of the esophagus. These injuries may include:
Several other atypical symptoms are
associated with GERD, but there is good evidence for causation only when they are accompanied by esophageal injury. These
symptoms are:
Some people have proposed that symptoms such as pharyngitis, sinusitis, recurrent ear infections, and idiopathic pulmonary fibrosis are due to GERD; however, a causative role has not
been established.[3]
[edit] Children
GERD may be difficult to detect in infants and children. Symptoms may vary from
typical adult symptoms. GERD in children may cause repeated vomiting,
effortless spitting up, coughing, and other respiratory
problems. Inconsolable crying, failure to gain adequate weight, refusing food, bad breath, and belching or burping are also common.
Children may have one symptom or many — no single symptom is universal in all children with GERD.
Common symptoms
of Paediatric Reflux
- Irritability and pain, sometimes screaming suddenly when asleep. Constant or sudden
crying or “colic” like
symptoms. Babies can be inconsolable especially when laid down
flat.
- Poor sleep habits typically with arching their necks and back during or after feeding
- Excessive
possetting or vomiting
- Frequent burping or frequent hiccups
- Excessive dribbling or running
nose
- Swallowing problems, gagging and choking
- Frequent ear infections or sinus congestion
- Babies
are often very gassy and extremely difficult to “burp” after feeds
- Refusing feeds or frequent feeds for
comfort
- Night time coughing, extreme cases of acid reflux can cause apnoea and respiratory problems such as asthma,
bronchitis and pneumonia if stomach contents are inhaled.
- Bad breath – smelling acidy
- Rancid/acid
smelling diapers with loose stool. Bowel movements can be very frequent or babies can be
constipated.
Vomiting feeds Possetting after a feed is quite normal with most infants. They gain weight,
feed well and have no other symptoms, but still this can be upsetting for parents. As the child gets older the lower
oesophageal sphincter becomes more competent so the vomiting should begin to show signs of improvement and eventually stop.
Some babies suffer more with reflux and about 60% of these babies with persistent reflux may have weight gain issues. It
is a very popular misconception though that all babies and children with reflux are underweight. This isn't always the
case, some may comfort eat and feed very frequently and not all are sick. Many doctors advise that babies outgrow reflux
once they can sit up, or once they stand. Many do, but some will not only fail to outgrow it, but will noticeably worsen with
developmental milestones, teething episodes, viral illness and weaning.
Silent Reflux Some babies with reflux
do not vomit at all. This is actually more of a problem because the acidic stomach contents go up the throat and back down
again, causing twice the pain and twice the damage.[citation needed] There is no clear relationship between symptoms and the
severity of reflux.
It is estimated that of the approximately 4 million babies born in the U.S. each year, up to 35%
of them may have difficulties with reflux in the first few months of their life, known as spitting up.[5] Most of those children will
outgrow their reflux by their first birthday. However, a small but significant number of them will not outgrow the condition.
This is particularly true where there is a family history of GERD present.
[edit] Barrett's esophagus
GERD may lead to Barrett's
esophagus, a type of metaplasia which is in turn a precursor condition
for carcinoma. The risk of progression from Barrett's to dysplasia is uncertain but is estimated at about 20% of cases.[6] Due to the risk of chronic
heartburn progressing to Barrett's, EGD every 5 years is recommended for patients with chronic heartburn, or who take drugs
for chronic GERD.[citation
needed]
[edit] Diagnosis
Endoscopic
image of peptic stricture, or narrowing of the
esophagus near the junction
with the
stomach. This is a complication of chronic gastroesophageal reflux
disease and can be a cause of
dysphagia or difficulty
swallowing
A detailed historical knowledge is vital for an accurate diagnosis. Useful investigations
may include barium swallow X-rays, esophageal manometry, 24 hour esophageal impedance-pH monitoring, and Esophagogastroduodenoscopy (EGD). In general,
an EGD is done when the patient either does not respond well to treatment or has alarm symptoms including dysphagia, anemia, blood in the stool (detected chemically), wheezing, weight loss, or voice changes. Some physicians advocate either
once-in-a-lifetime or 5/10-yearly endoscopy for patients with longstanding GERD, to evaluate the possible presence of
dysplasia or Barrett's esophagus, a precursor lesion
for esophageal adenocarcinoma.[7]
Esophagogastroduodenoscopy (EGD) (a form of endoscopy) involves insertion of a thin scope through the mouth and throat into
the esophagus and stomach (often while the patient is sedated) in order to assess the internal surfaces of the esophagus,
stomach, and duodenum.
Biopsies can be performed during gastroscopy and these may show:
- Edema and basal hyperplasia
(non-specific inflammatory changes)
- Lymphocytic inflammation (non-specific)
- Neutrophilic inflammation
(usually due to reflux or Helicobacter gastritis)
- Eosinophilic inflammation (usually due to reflux)
- Goblet cell intestinal
metaplasia or Barretts esophagus
- Elongation of the papillae
- Thinning of the squamous cell layer
- Dysplasia or pre-cancer
- Carcinoma
Reflux changes may be non-erosive in nature, leading to the entity "non-erosive
reflux disease".
Another test that has been used is the "Bernstein test".[8]
[edit] Pathophysiology
GERD is caused by a failure of the
cardia. In healthy patients, the "Angle of His"—the angle at which the esophagus
enters the stomach—creates a valve that prevents duodenal bile, enzymes, and stomach acid from traveling back into the
esophagus where they can cause burning and inflammation of sensitive esophageal tissue.
Another paradoxical cause of
GERD-like symptoms is not enough stomach acid (hypochlorhydria). The valve that empties the stomach into the intestines is triggered by acidity. If
there is not enough acid, this valve does not open, and the stomach contents are churned up into the esophagus. However,
there is still enough acidity to irritate the esophagus.
Factors that can contribute to GERD:
GERD has been linked to laryngitis, chronic cough, pulmonary fibrosis, earache, and asthma, even when not clinically apparent, as
well as to laryngopharyngeal reflux and ulcers
of the vocal cords.
Factors that have been
linked with GERD but not conclusively:
In 1999, a review of existing
studies found that, on average, 40% of GERD patients also had H. pylori infection.[13] The eradication of H. pylori can lead to an increase in
acid secretion,[14]
leading to the question of whether H. pylori-infected GERD patients are any different than non-infected GERD patients.
A double-blind study, reported in 2004, found no
clinically significant difference between these two types of patients with regard to the subjective or objective measures of
disease severity.[15]
[edit] Treatment
Three classes of treatments exist for
GERD. These include lifestyle modifications, medications, and surgery.
[edit] Lifestyle modifications
- Dietary
modification
Certain foods and lifestyle are considered to promote gastroesophageal reflux, but a 2006 review
suggested that evidence for most dietary interventions is anecdotal; only weight loss and elevating the head of the bed were supported by evidence.[16] A subsequent randomized crossover study showed benefit by avoiding eating two hours before
bedtime.[9]
- Coffee, alcohol, and excessive amounts
of Vitamin C supplements stimulate gastric acid secretion. Taking these
before bedtime especially can cause evening reflux.
- Antacids based on calcium carbonate
(but not aluminum hydroxide) were found
to actually increase the acidity of the stomach. However, all antacids reduced acidity in the lower esophagus, so the net
effect on GERD symptoms may still be positive.[17]
- Foods high in fats and smoking reduce lower esophageal sphincter competence, so avoiding these may help. Fat also delays
stomach emptying.
- Eating within 2–3 hours before bedtime.
- Large meals. Having smaller, more frequent
meals reduces GERD risk, as it means there is less food in the stomach at any one time.
- Carbonated soft drinks with
or without sugar.
- Chocolate and peppermint.
- Acidic foods: tomatoes and tomato-based preparations; citrus fruits and citrus juices.
- Cruciferous vegetables:cabbage, cauliflower, broccoli, and Brussels sprouts.
- Milk and milk-based products containing calcium[citation needed] and fat, within 2 hours of
bedtime.
- Positional therapy
Sleeping on the left side has been shown to reduce nighttime
reflux episodes in patients.[18]
A meta-analysis suggested that elevating the head of bed is an effective therapy, although this
conclusion was only supported by nonrandomized studies.[16] The head of the bed can be elevated by plastic or
wooden bed risers that support bed posts or legs, a therapeutic bed wedge pillow, or a wedge or an inflatable mattress lifter
that fits in between mattress and box spring. The height of the elevation is critical and must be at least 6 to 8 inches (15
to 20 cm) to be at least minimally effective to prevent the backflow of gastric fluids. Some innerspring mattresses do
not work well when inclined and may cause back pain; some prefer foam mattresses. Some practitioners use higher degrees of
incline than provided by the commonly suggested 6 to 8 inches (15 to 20 cm) and claim greater success.
[edit] Medications
A number of drugs are approved to treat
GERD, and are among the most-often-prescribed forms of medication in most Western countries.
- Proton pump inhibitors (such as omeprazole, pantoprazole, lansoprazole, and rabeprazole) are the most effective in reducing gastric acid secretion. These drugs stop acid
secretion at the source of acid production, i.e., the proton pump.
- Gastric H2 receptor blockers (such as ranitidine, famotidine and cimetidine)
can reduce gastric secretion of acid. These drugs are technically antihistamines. They relieve complaints in about 50% of all GERD patients. Compared to placebo (which
also is associated with symptom improvement), they have a number needed to treat of eight (8).[19]
- Antacids before meals or symptomatically after symptoms begin can reduce gastric acidity (increase pH).
- Alginic acid (Gaviscon) may coat the mucosa as well as increase pH and decrease reflux. A meta-analysis of randomized controlled trials suggests alginic acid may be the most effective of non-prescription treatments with
a number needed to treat of 4.[19]
- Prokinetics strengthen the lower esophageal sphincter (LES) and speed up gastric
emptying. Cisapride, a member of this class, was withdrawn from the market
for causing Long QT syndrome Reglan (metoclopramide) is a
prokinetic with significant side effects called Tardive Dyskinesia/Dystonia. The United States Food and Drug Administration
issued a Black Box Warning about Reglan in January 2009. A complete list of the symptoms of TD (plain English) are available
at [20]
- Sucralfate (Carafate) is also useful as an adjunct in helping to heal and
prevent esophageal damage caused by GERD, however it must be taken several times daily and at least two (2) hours apart from
meals and medications.
- Mosapride citrate is a 5-HT4 receptor agonist used outside the United States largely as a therapy for GERD and dyspepsia.[21]
Clinical trials which compare GERD treatments
head-to-head provide physicians with critical information. Unfortunately most pharmaceutical-company sponsored studies are
conducted versus placebo and not an active control. However, the DIAMOND has shown rough equivalence of efficacy between a
"step-up" approach to therapy (antacids, followed by histamine antagonists, followed by PPIs) and a "step-down" approach (the
reverse). The primary endpoint of the study was treatment success after 6 months, and was achieved for 70% of patients in
"step-down" versus 72% of patients in "step-up".[22]
[edit] Surgical treatments
The standard surgical treatment is
the Nissen fundoplication. In this procedure
the upper part of the stomach is wrapped around the LES to strengthen the sphincter and prevent acid reflux and to repair a
hiatal hernia. The procedure is often done laparoscopically.[23] When compared to medical management laparoscopic
fundoplication had better results at 1 year.[24]
An obsolete treatment is vagotomy ("highly selective vagotomy"), the surgical removal of vagus nerve branches that innervate the stomach lining. This treatment has been largely replaced by
medication.
Another treatment is transoral incisionless fundoplication (TIF) with the use of a device called Esophyx,
which allows doctors to rebuild the valve between the stomach and the diaphragm by going through the esophagus.[25]
[edit] Other treatments
In 2000 the U.S. Food and Drug
Administration (FDA) approved two endoscopic devices to treat chronic
heartburn. One system, Endocinch, puts stitches in the LES to create little pleats that help strengthen the muscle. However,
long-term results were disappointing, and the device is no longer sold by Bard. Another, the Stretta Procedure, uses electrodes to apply radio frequency
energy to the LES. The long-term outcomes of both procedures compared to a Nissen fundoplication are still being
determined.
Subsequently the NDO Surgical Plicator was cleared by the FDA for endoscopic GERD treatment. The Plicator
creates a plication, or fold, of tissue near the gastroesophageal junction, and fixates the plication with a suture-based
implant. The company ceased operations in mid 2008, and the device is no longer on the market.
Another treatment that
involved injection of a solution during endoscopy into the lower esophageal wall was available for about one year ending in
late 2005. It was marketed under the name Enteryx. It was removed from the market due to several reports of complications
from misplaced injections.
[edit] References
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- ^ http://www.healingdaily.com/conditions/saliva-ph-test.htm
- ^ a b
c Kahrilas, PJ (2008). "Gastroesophageal Reflux
Disease". New England Journal of Medicine. 359 (16): 1700–1707. doi:10.1056/NEJMcp0804684. http://content.nejm.org/cgi/content/short/359/16/1700.
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- ^ http://www.reflux.org/reflux/webdoc01.nsf/487b3ba0c2f1a4ff85256ff30009f061/6472ef5bda1863778525703b005b9c3e/$FIL
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[edit] External links