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Difference Between Small and Large Bowel Obstruction

January 2, 2018 Posted by Ranidu

Key Difference – Small vs Large Bowel Obstruction
 

Intestinal obstruction is one of the most serious surgical emergencies. Patient’s life is at risk if prompt medical attention is not given in case of an intestinal obstruction. Depending on the site of occlusion, clinical manifestations vary. Out of the clinical signs and symptoms associated with bowel obstruction, constipation can be considered as the main feature that helps the clinicians to localise the site of obstruction. There is absolute constipation in small bowel obstruction but not in large bowel obstruction. This is the key difference between the obstructions at these two sites.

CONTENTS

1. Overview and Key Difference
2. What is Small Bowel Obstruction
3. What is Large Bowel Obstruction
4. Similarities Between Small and Large Bowel Obstruction
5. Side by Side Comparison – Small vs Large Bowel Obstruction in Tabular Form
6. Summary

What is Small Bowel Obstruction?

Small bowel consists of three major regions as duodenum, jejunum, and ileum. It is responsible for the absorption of vital nutrients from the food that has been appropriately conditioned by the gastric juices. An obstruction of the small intestinal lumen can give rise to various clinical manifestations that are predominantly due to the hindrance to the passage of ingested food through the gastrointestinal tract.

Causes

  • Strangulated hernias
  • Adhesions
  • Malignancies
  • Crohns disease
  • Volvulus

Clinical Features

  • A high bowel obstruction gives rise to nausea, vomiting and frequent colics
  • There is a slight, central abdominal distension
  • Constipation is extremely rare

Risk Factors

  • Previous pelvic or abdominal surgeries
  • TB
  • Inflammatory bowel disease

Investigations

The clinical suspicion of intestinal obstruction can be confirmed through the following investigations.

  • CT Scan
  • USS
  • Endoscopy
Difference Between Small and Large Bowel Obstruction

Figure 01 : An upright X-ray showing Small Bowel Obstruction

Management

Management of intestinal obstruction varies according to the underlying cause of the condition. When the obstruction is due to inflammatory bowel disease, anti-inflammatory drugs are given to control the inflammatory changes in the bowel thus alleviating the obstruction. A malignant or benign tumor that occludes the lumen can be surgically resected.  A strangulated obstruction of the small bowel is a surgical emergency because of the possibility of ischemic necrosis of the intestinal segment that is distal to the point of strangulation.

What is Large Bowel Obstruction?

Food that has passed through the small intestine then enters into the large bowel inside which the resorption of water happens.  An obstruction of the large bowel can give rise to a clinical picture that is entirely different from that due to the obstruction of the small bowel.

Causes

  • Carcinomas
  • Diverticulitis
  • Volvulus
  • Pseudo-obstruction of the large bowel secondary to some retroperitoneal pathologies

Clinical Features

  • A low large bowel obstruction can cause a prominent peripheral abdominal distension
  • Colicky type abdominal pain can also be present
  • There is absolute constipation in case of a large bowel obstruction
  • Vomiting does not usually occur in a large bowel obstruction

Investigations

The following investigations support the process of arriving at a definitive diagnosis

  • CT
  • Sigmoidoscopy
  • Contrast radiography with enema
  • Full blood count
  • Hematocrit
Key Difference Between Small and Large Bowel Obstruction

Figure 02: Large Bowel Obstruction

Management

Surgical interventions are almost inevitable. Volume resuscitation of the patient and the administration of prophylactic broad-spectrum antibiotics are extremely important during the preoperative preparation. In the most severe cases, insertion of a nasogastric tube may be necessary.

What is the Similarity Between Small and Large Bowel Obstruction?

  • The obstruction of the passage of food through the lumen of the gastrointestinal tract is the cause of clinical symptoms in both conditions.

What is the Difference Between Small and Large Bowel Obstruction?

Small Bowel Obstruction vs Large Bowel Obstruction

An obstruction of the small intestinal lumen with the can be identified as the small bowel obstruction. An obstruction in the large intestinal lumen can be identified as the large bowel obstruction.
 Causes
Causes of small bowel obstruction are,

·         Strangulated hernias

·         Adhesions

·         Malignancies

·         Crohns disease

·         Volvulus

Large bowel obstruction is caused by,

·         Carcinomas

·         Diverticulitis

·         Volvulus

·         Pseudo-obstruction of the large bowel secondary to some retroperitoneal pathologies

Signs and Symptoms
Signs and Symptoms of small bowel obstruction include,

·         A high bowel obstruction gives rise to nausea, vomiting and frequent colics

·         There is a slight, central abdominal distension

·         Constipation is extremely rare

The following clinical features can be seen in large bowel obstruction,

·         A low large bowel obstruction can cause a prominent peripheral abdominal distension

·         Colicky type abdominal pain can also be present

·         There is absolute constipation in case of a large bowel obstruction

·         Vomiting does not usually occur in a large bowel obstruction

 Investigation
A clinical suspicion of small intestinal obstruction can be confirmed through the following investigations.

·         CT

·         USS

·         Endoscopy

The following investigations support the process of arriving at a definitive diagnosis

·         CT

·         Sigmoidoscopy

·         Contrast radiography with enema

·         Full blood count

·         Hematocrit

Management and Treatment
Management varies according to the underlying cause of the condition.

·         When the obstruction is due to inflammatory bowel disease, anti-inflammatory drugs are given to control the inflammatory changes in the bowel thus alleviating the obstruction.

·         A malignant or benign tumor that occludes the lumen can be surgically resected.

·         A strangulated obstruction of the small bowel is a surgical emergency because of the possibility of ischemic necrosis of the intestinal segment that is distal to the point of strangulation.

·         Surgical interventions are almost inevitable.

·         Volume resuscitation of the patient and the administration of prophylactic broad-spectrum antibiotics are extremely important during the preoperative preparation.

·         In the most severe cases, insertion of a nasogastric tube may be necessary.

Summary – Small vs Large Bowel Obstruction

Depending on the site of obstruction, clinical features that appear vary. In small bowel obstruction, the chance of having absolute constipation is extremely distant. But absolute constipation is a typical feature of large bowel obstruction. This is the difference between Small and Large Bowel Obstruction.

Download the PDF Version of Small vs Large Bowel Obstruction

You can download PDF version of this article and use it for offline purposes as per citation note. Please download PDF version here Difference Between Small and Large Bowel Obstruction

Reference:

1. Burnand, Kevin G., John Black, Steve Corbett, W. E. G. Thomas, and Norman L. Browse. Browses introduction to the symptoms & signs of surgical disease. 5th ed. Boca Raton, FL: CRC Press, 2014. Print.

Image Courtesy:

1.Upright X-ray demonstrating small bowel obstruction’By James Heilman, MD – Own work, (CC BY-SA 3.0) via Commons Wikimedia

2.’LargeBowelObsUp2008’By James Heilman, MD – Own work, (CC BY-SA 3.0) via Commons Wikimedia

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Filed Under: Diseases Tagged With: Large Bowel Obstruction, Large Bowel Obstruction Causes, Large Bowel Obstruction Clinical Features, Large Bowel Obstruction Definition, Large Bowel Obstruction Investigation, Large Bowel Obstruction Management, Large Bowel Obstruction Treatment, Signs and Symptoms of large bowel obstruction, Signs and Symptoms of small bowel obstruction, Small and Large Bowel Obstruction Differences, Small and Large Bowel Obstruction Similarities, Small Bowel Obstruction, Small Bowel Obstruction Causes, Small Bowel Obstruction Clinical Features, Small Bowel Obstruction Definition, Small Bowel Obstruction Investigation, Small Bowel Obstruction Management, Small Bowel Obstruction Treatment, Small vs Large Bowel Obstruction

About the Author: Ranidu

Ranidu is passionate about writing articles on medical topics in general parlance. His experience in communicating with the general public during his medical practice has enabled him to describe facts that a layman has to know about a particular disorder in a concise and understandable manner.

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