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Symptoms and Signs – Differential Diagnosis of Absent Bowel Sounds
When a person listens for at least five minutes and is unable to detect any bowel sounds using a stethoscope in any quadrant, the condition is known as absent bowel sounds. When peristalsis is stopped by mechanical, vascular, or neurogenic inhibition, bowel noises stop. Stopping peristalsis causes gas from the bowel contents and fluid secreted by the intestinal walls to build up and expand the lumen, which can result in hypovolemic shock or potentially fatal consequences such perforation, peritonitis, and sepsis.
Dehydration is brought on by simple mechanical obstructions such as adhesions, hernias, or tumors that promote fluid and electrolyte loss. Vascular blockage results in ischemia, necrosis, and shock by stopping blood flow to the gut walls. Trauma, intestinal distention, or infection can all cause neurogenic inhibition, which impairs gut wall innervation. It could also come after a metabolic disturbance like hypokalemia or a mechanical or vascular blockage.
When bowel movements abruptly stop and there is also distention, rigidity, and pain in the abdomen, it is an emergency that needs to be treated right once. The absence of bowel noises after a time of hyperactivity is also concerning as it could suggest that the bowel is mechanically clogged and is being strangled.
IMMEDIATE REACTIONS
As you get ready to implant a nasogastric (NG) or intestinal tube to suction lumen contents and decompress the bowel, keep in mind that if you are unable to detect bowel sounds and the patient complains abrupt, acute abdominal pain and cramping or displays severe abdominal distention. (See Do You Actually Hear Bowel Sounds?) In order to counteract dehydration and imbalances brought on by the malfunctioning gut, give IV fluids and electrolytes.
Refrain from giving the patient oral medication since they might need surgery to remove an obstruction. As you take the patient's vital signs, keep an eye out for any indications of shock, such as tachycardia, hypotension, or cool, clammy skin. To gauge any changes that may occur, measure the circumference of the abdomen.
Examining the body and taking a history
Proceed with a brief history if the patient's condition allows. Begin with pain in the abdomen: When did it start? Has the situation gotten worse? He feels it where? Inquire about gas and bloating feelings. Find out if the patient has experienced diarrhea or has passed thin stools, as these could indicate the onset of a luminal obstruction. It's possible that the patient experienced no bowel movements at all, which could indicate total obstruction or paralytic ileus
Inquire about ailments such hernias, adhesions from prior surgery, and abdominal tumors that frequently cause mechanical obstruction. Find out whether the patient had any accidents that might have contributed to the vascular clots, even if they seem small, like falling off a stepladder. Look for a history of diverticulitis, gynecologic infections, or acute pancreatitis, as these conditions may have contributed to intestinal dysfunction and an intra-abdominal infection. Make sure to inquire about spinal cord injuries, which can result in paralytic ileus, as well as past toxic diseases like uremia.
A thorough physical examination, an assessment of the abdomen and pelvis, and a detailed medical and surgical history should be obtained if the patient's pain is not severe or accompanied by other life-threatening signs or symptoms.
Examine the abdomen contours first in your assessment. To identify either localized or generalized distention, bend down at the recumbent patient's side and then at the foot of his bed. Gently tap and feel the abdomen. In places that are filled with fluid, listen for dullness; in gas pockets, listen for tympany. Examine the abdomen for guarding and rigidity, as these may indicate peritoneal irritation and paralytic ileus.
total mechanical blockage of the intestines
In this potentially fatal condition, hyperactive bowel noises are followed by periods of absent bowel sounds. This quiet is accompanied by sharp, finicky abdominal pain that originates in the obstruction's quadrant and may spread to the lumbar or flank areas. Abdominal distention, bloating, constipation, nausea, and vomiting are associated symptoms (the more severe and earlier the vomiting, the higher the obstruction). In the latter stages, fever, rebound soreness, and rigidity in the abdomen could be symptoms of shock.
Mesenteric artery occlusion
Bowel sounds eventually go away with mesenteric artery blockage, a potentially fatal condition, following a brief time of hyperactive sounds. Next come indications of shock, vomiting, constipation, bruits, abdominal distention, and sudden, intense midepigastric or periumbilical discomfort. Fever is typical. Later on, abdominal stiffness could manifest.
Ileus paralysis (adynamic). Absence of bowel noises is the cardinal sign. Associated signs and symptoms of paralytic ileus include nonspecific discomfort, constipation, or the passing of tiny watery stools in addition to abdominal distention. If acute abdomen pain is followed by paralytic ileus infection, fever, and stomach ache are possible side effects for the patient.
Other Reasons
surgery on the abdomen. Following abdominal surgery, bowel noises typically disappear due to the combination of anesthesia and surgical maneuvers.
Special Considerations
After you’ve inserted an NG or intestinal tube, elevate the head of the patient’s bed at least 30 degrees, and turn the patient to facilitate passage of the tube through the GI tract. (Remember not to tape an intestinal tube to the patient’s face.) Ensure tube patency by checking for drainage and properly functioning suction devices, and irrigate accordingly.
Continue to administer I.V. fluids and electrolytes, and make sure that you send a serum specimen to the laboratory for electrolyte analysis at least once per day. The patient may need X-ray studies and further blood work to determine the cause of absent bowel sounds.
After mechanical obstruction and intra-abdominal sepsis have been ruled out as the cause of absent bowel sounds, give the patient drugs to control pain and stimulate peristalsis. Remember that opioids may slow peristalsis.
Patient Counseling
Explain the need for diagnostic tests and therapeutic procedures, including postoperative ambulation. Also, explain which foods and fluids the patient should avoid.
Pediatric Pointers
Absent bowel sounds in children may result from Hirschsprung’s disease or intussusception, both of which can lead to life-threatening obstruction.
Geriatric Pointers
Older patients with a bowel obstruction that doesn’t respond to decompression should be considered for early surgical intervention to avoid the risk of bowel infarct.
When a person listens for at least five minutes and is unable to detect any bowel sounds using a stethoscope in any quadrant, the condition is known as absent bowel sounds. When peristalsis is stopped by mechanical, vascular, or neurogenic inhibition, bowel noises stop. Stopping peristalsis causes gas from the bowel contents and fluid secreted by the intestinal walls to build up and expand the lumen, which can result in hypovolemic shock or potentially fatal consequences such perforation, peritonitis, and sepsis.
Dehydration is brought on by simple mechanical obstructions such as adhesions, hernias, or tumors that promote fluid and electrolyte loss. Vascular blockage results in ischemia, necrosis, and shock by stopping blood flow to the gut walls. Trauma, intestinal distention, or infection can all cause neurogenic inhibition, which impairs gut wall innervation. It could also come after a metabolic disturbance like hypokalemia or a mechanical or vascular blockage.
When bowel movements abruptly stop and there is also distention, rigidity, and pain in the abdomen, it is an emergency that needs to be treated right once. The absence of bowel noises after a time of hyperactivity is also concerning as it could suggest that the bowel is mechanically clogged and is being strangled.
IMMEDIATE REACTIONS
As you get ready to implant a nasogastric (NG) or intestinal tube to suction lumen contents and decompress the bowel, keep in mind that if you are unable to detect bowel sounds and the patient complains abrupt, acute abdominal pain and cramping or displays severe abdominal distention. (See Do You Actually Hear Bowel Sounds?) In order to counteract dehydration and imbalances brought on by the malfunctioning gut, give IV fluids and electrolytes.
Refrain from giving the patient oral medication since they might need surgery to remove an obstruction. As you take the patient's vital signs, keep an eye out for any indications of shock, such as tachycardia, hypotension, or cool, clammy skin. To gauge any changes that may occur, measure the circumference of the abdomen.
Examining the body and taking a history
Proceed with a brief history if the patient's condition allows. Begin with pain in the abdomen: When did it start? Has the situation gotten worse? He feels it where? Inquire about gas and bloating feelings. Find out if the patient has experienced diarrhea or has passed thin stools, as these could indicate the onset of a luminal obstruction. It's possible that the patient experienced no bowel movements at all, which could indicate total obstruction or paralytic ileus
Inquire about ailments such hernias, adhesions from prior surgery, and abdominal tumors that frequently cause mechanical obstruction. Find out whether the patient had any accidents that might have contributed to the vascular clots, even if they seem small, like falling off a stepladder. Look for a history of diverticulitis, gynecologic infections, or acute pancreatitis, as these conditions may have contributed to intestinal dysfunction and an intra-abdominal infection. Make sure to inquire about spinal cord injuries, which can result in paralytic ileus, as well as past toxic diseases like uremia.
A thorough physical examination, an assessment of the abdomen and pelvis, and a detailed medical and surgical history should be obtained if the patient's pain is not severe or accompanied by other life-threatening signs or symptoms.
Examine the abdomen contours first in your assessment. To identify either localized or generalized distention, bend down at the recumbent patient's side and then at the foot of his bed. Gently tap and feel the abdomen. In places that are filled with fluid, listen for dullness; in gas pockets, listen for tympany. Examine the abdomen for guarding and rigidity, as these may indicate peritoneal irritation and paralytic ileus.
total mechanical blockage of the intestines
In this potentially fatal condition, hyperactive bowel noises are followed by periods of absent bowel sounds. This quiet is accompanied by sharp, finicky abdominal pain that originates in the obstruction's quadrant and may spread to the lumbar or flank areas. Abdominal distention, bloating, constipation, nausea, and vomiting are associated symptoms (the more severe and earlier the vomiting, the higher the obstruction). In the latter stages, fever, rebound soreness, and rigidity in the abdomen could be symptoms of shock.
Mesenteric artery occlusion
Bowel sounds eventually go away with mesenteric artery blockage, a potentially fatal condition, following a brief time of hyperactive sounds. Next come indications of shock, vomiting, constipation, bruits, abdominal distention, and sudden, intense midepigastric or periumbilical discomfort. Fever is typical. Later on, abdominal stiffness could manifest.
Ileus paralysis (adynamic). Absence of bowel noises is the cardinal sign. Associated signs and symptoms of paralytic ileus include nonspecific discomfort, constipation, or the passing of tiny watery stools in addition to abdominal distention. If acute abdomen pain is followed by paralytic ileus infection, fever, and stomach ache are possible side effects for the patient.
Other Reasons
surgery on the abdomen. Following abdominal surgery, bowel noises typically disappear due to the combination of anesthesia and surgical maneuvers.
Special Considerations
After you’ve inserted an NG or intestinal tube, elevate the head of the patient’s bed at least 30 degrees, and turn the patient to facilitate passage of the tube through the GI tract. (Remember not to tape an intestinal tube to the patient’s face.) Ensure tube patency by checking for drainage and properly functioning suction devices, and irrigate accordingly.
Continue to administer I.V. fluids and electrolytes, and make sure that you send a serum specimen to the laboratory for electrolyte analysis at least once per day. The patient may need X-ray studies and further blood work to determine the cause of absent bowel sounds.
After mechanical obstruction and intra-abdominal sepsis have been ruled out as the cause of absent bowel sounds, give the patient drugs to control pain and stimulate peristalsis. Remember that opioids may slow peristalsis.
Patient Counseling
Explain the need for diagnostic tests and therapeutic procedures, including postoperative ambulation. Also, explain which foods and fluids the patient should avoid.
Pediatric Pointers
Absent bowel sounds in children may result from Hirschsprung’s disease or intussusception, both of which can lead to life-threatening obstruction.
Geriatric Pointers
Older patients with a bowel obstruction that doesn’t respond to decompression should be considered for early surgical intervention to avoid the risk of bowel infarct.
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