Mason Blake
Bowel sounds are the noises made by the movement of the intestines as they push food through. They are typically intermittent, low-pitched, chuckling sounds. Bowel sounds are usually normal and simply indicate that the gastrointestinal tract is working. However, they can be altered or absent in certain disease states. For example, in late intestinal obstruction, there may be a loss of all bowel sounds due to a loss of peristaltic activity. Parenteral nutrition (PN) is often initiated when critically ill patients experience gastrointestinal complications such as vomiting and bowel movement disorders (e.g. diarrhea and constipation) during enteral nutrition (EN). Therefore, it is important to understand the relationship between bowel sounds and total parenteral nutrition (TPN) as a form of PN.
| Characteristics | Values |
|---|---|
| Bowel sounds | Normal bowel sounds are intermittent, low-pitched, chuckling sounds. |
| Bowel sounds are caused by the movement of the intestines as they push food through. | |
| Hypoactive bowel sounds are normal during sleep, after certain medicines, and after abdominal surgery. | |
| Hyperactive bowel sounds can be heard without a stethoscope and indicate increased intestinal activity, which may be caused by diarrhea or eating. | |
| Hyperactive bowel sounds may also be caused by blocked blood vessels, blood clots, hernia, tumor, or intestinal obstruction. | |
| Absent bowel sounds may indicate constipation, paralytic ileus, or intestinal rupture. | |
| Absent bowel sounds in critically ill patients may indicate gastrointestinal complications, such as vomiting and bowel movement disorders. | |
| Early initiation of enteral nutrition (EN) may prevent atrophy of intestinal mucosa and gastrointestinal peristalsis. |
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What You'll Learn
- Bowel sounds are made by the movement of the intestines as they push food through
- Hypoactive bowel sounds are normal during sleep and after abdominal surgery
- Hyperactive bowel sounds can be caused by diarrhea or after eating
- Paralytic ileus is a functional obstruction caused by intestinal muscle paralysis
- Bowel sounds are used to detect intestinal obstruction
Bowel sounds are made by the movement of the intestines as they push food through
Abdominal or bowel sounds are made by the movement of the intestines as they push food through. The intestines are hollow, so bowel sounds echo through the abdomen in a similar way to the sounds heard from water pipes. Most bowel sounds are normal and simply indicate that the gastrointestinal tract is working. However, abnormal sounds can sometimes indicate a problem.
A healthcare provider can check abdominal sounds by listening to the abdomen with a stethoscope, a process known as auscultation. When bowel sounds are not present, it is recommended that one listens for a full 3 minutes before determining that bowel sounds are indeed absent. Bowel sounds reflect gas movement in the intestines, and similar sounds can be heard when water and gas are injected via a tube inserted into the duodenum. Therefore, bowel sounds cannot be used to confirm normal functioning intestines, intestinal integrity, mucosal barriers, or preserved intestinal absorption.
Bowel sounds can be hypoactive or hyperactive. Hypoactive bowel sounds are normal during sleep and for a short time after abdominal surgery or the use of certain medicines. They can indicate constipation, or in the case of a prolonged ileus, nausea, vomiting, abdominal distention, and obstipation. Hyperactive bowel sounds indicate increased intestinal activity and may occur with diarrhea or after eating. Hyperactive bowel sounds may also be a sign of early bowel obstruction.
In the case of critically ill patients, enteral nutrition (EN) must be discontinued if gastrointestinal complications, such as vomiting and bowel movement disorders, do not resolve with appropriate management. EN may also promote intestinal peristalsis. Parenteral nutrition (PN) must be initiated in such cases.
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Hypoactive bowel sounds are normal during sleep and after abdominal surgery
Hypoactive bowel sounds are a normal occurrence during sleep and after abdominal surgery. They can also be caused by medication side effects, such as opioid pain medication, which can cause constipation. Absent or sluggish bowel sounds may also be a result of postoperative ileus, a common complication after abdominal surgery. This condition causes delayed bowel movement or the passage of flatus, with abdominal distension and possible nausea or vomiting.
Hypoactive bowel sounds can be indicative of a sluggish or non-functioning digestive system. A nurse may hear fewer than three bowel sound events in a minute or none at all. These sounds can be intermittent and easily missed, but they may also be a vital health indicator. Bowel sounds are the noises produced by the contraction and relaxation of the muscles lining the stomach and intestines, aiding in the propulsion of gas and fluids through the alimentary canal.
After abdominal surgery, some degree of postoperative ileus is nearly universal. This condition is characterised by a prolonged absence of bowel function, with symptoms including abdominal distension, bloating, diffuse persistent pain, nausea, vomiting, and an inability to pass flatus. Postoperative ileus is more likely to develop after prolonged major surgical procedures, general anaesthesia, and the use of opioid pain medication.
It is important to note that bowel sounds are not exclusive to the digestive system, and other factors must be considered when assessing a patient's health. For example, hyperactive bowel sounds may be caused by food intolerance due to dietary changes, while hypoactive bowel sounds could be a result of medication side effects or post-surgery recovery. In some cases, hypoactive bowel sounds may indicate a serious blockage known as a bowel obstruction.
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Hyperactive bowel sounds can be caused by diarrhea or after eating
Hyperactive bowel sounds are abdominal sounds that are louder and more frequent, indicating increased intestinal activity. They are usually caused by the movement of fluids and gases through the gastrointestinal tract. It is normal to experience hyperactive bowel sounds after eating, as the gut contracts and creates noise that echoes in the intestines. This is especially true if you have eaten foods that your body cannot properly digest, such as in the case of food intolerances or celiac disease.
Hyperactive bowel sounds can also be caused by an increase in intestinal gas, which can be a result of hunger or certain foods and beverages, such as carbonated drinks. Hunger triggers the digestive system to contract, increasing bowel sounds. Hyperactive bowel sounds can also be a symptom of gastroenteritis, which involves inflammation of the stomach and intestines due to an infection. This is often accompanied by diarrhea, and may be a sign of food poisoning.
Diarrhea is characterised by loose, watery stools, and is typically a sign that the digestive system is not functioning normally. It can be caused by various factors, including intestinal blockage, infections, food intolerances, stress, anxiety, and underlying bowel issues. Diarrhea may also be a symptom of inflammatory bowel disease (IBD), which includes Crohn's disease and ulcerative colitis, both of which cause inflammation of the digestive tract and can affect digestion.
If you are experiencing hyperactive bowel sounds along with diarrhea, vomiting, constipation, or severe abdominal pain, it is recommended that you seek medical advice. A healthcare professional can help identify any underlying conditions and advise on appropriate treatments or dietary changes.
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Paralytic ileus is a functional obstruction caused by intestinal muscle paralysis
Paralytic ileus is often a temporary reaction of the body to trauma, such as surgery or infection. It can also be caused by chemical factors, including medications, metabolic disturbances, and electrolyte imbalances. The condition is characterized by abdominal pain, bloating, constipation, nausea, vomiting, and dehydration. It is diagnosed through medical history, physical examination, and imaging tests such as X-rays or abdominal ultrasounds, which reveal swollen and dilated segments of the bowel without any mechanical blockage.
The treatment of paralytic ileus involves correcting any underlying abnormalities and using nasogastric tube decompression until normal peristalsis resumes. It is important to address gastrointestinal complications, such as vomiting and bowel movement disorders, during treatment. Early initiation of enteral nutrition (EN) is recommended to maintain the structure and function of the gastrointestinal mucosa and promote intestinal peristalsis. However, EN may need to be discontinued or interrupted if these complications do not resolve with appropriate management.
Paralytic ileus can be life-threatening if left untreated for an extended period. It is a neurogenic condition, involving the failure of the normal electrical slow wave in the smooth muscle to excite any action potentials. This paralysis of intestinal muscles can be caused by various stimuli, including postoperative states, infectious gastroenteritis, sepsis, peritonitis, intestinal ischemia, narcotics, laxative abuse, anticholinergics, electrolyte disturbances, and endocrinopathies.
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Bowel sounds are used to detect intestinal obstruction
Bowel sounds are the noises made by the movement of the intestines as they push food through. These sounds are usually normal and simply indicate that the gastrointestinal tract is functioning. However, abnormal bowel sounds can sometimes indicate a problem.
For example, hypoactive bowel sounds, which are quieter, less regular, or less toned than usual, can indicate constipation. On the other hand, hyperactive bowel sounds, which are louder and more frequent, can be caused by diarrhea or eating.
Very high-pitched bowel sounds may be a sign of early bowel obstruction. Bowel obstruction is a partial or complete blockage of the small or large intestine, usually caused by scar tissue, hernias, or colon cancer. It is a medical emergency that requires immediate attention.
Healthcare providers can use a stethoscope to listen for bowel sounds that signal an obstruction. Spectral analysis of bowel sounds using an electronic stethoscope can help support a clinical diagnosis of intestinal obstruction. This analysis involves measuring sound duration, sound-to-sound interval, dominant frequency, and peak frequency. In acute large bowel obstruction, the sound duration is longer, and the dominant frequency is higher compared to acute small bowel obstruction.
While bowel sounds can be used as a tool to help diagnose intestinal obstruction, they are not always accurate. Computerized bowel sound analysis has also been used to investigate intestinal obstruction, but this technology is still in the research phase.
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Frequently asked questions
Bowel sounds are the noises made by the movement of the intestines as they push food through.
Normal peristalsis of the intestine produces bowel sounds as gas and fluid are passed through the intestinal lumen.
Hypoactive bowel sounds include a reduction in the loudness, tone, or regularity of the sounds. Hyperactive bowel sounds mean there is an increase in intestinal activity.
Blocked blood vessels, blood clots, mechanical bowel obstruction, and paralytic ileus can all cause abnormal bowel sounds.
TPN stands for total parenteral nutrition. Bowel sounds are present when food is passing through the intestines. Therefore, if TPN is being used, bowel sounds may be diminished or absent.
