What Is the Ascending Colon?

Ascending colon (also known as ascending colon), the lower end is connected to the cecum, the upper edge is connected to the transverse colon under the liver, and the length is 12-20 cm. There are the small intestine, the greater omentum and the anterior abdominal wall; the back is connected to the posterior abdominal wall by loose connective tissue, and there is a right kidney, a lumbar dorsal fascia from the top to the bottom, and a descending duodenum and a right ureter on the inside. . The function of the ascending colon is to promote food digestion and absorption. Its illness and health directly affect the digestion and absorption of nutrients.

Ascending colon (also known as ascending colon), the lower end is connected to the cecum, the upper edge is connected to the transverse colon under the liver, and the length is 12-20 cm; the front and sides are covered with peritoneum, which fixes it to the posterior and ventral walls; There are the small intestine, the greater omentum and the anterior abdominal wall; the back is connected to the posterior abdominal wall by loose connective tissue, and there is a right kidney, a lumbar dorsal fascia from the top to the bottom, and a descending duodenum and a right ureter on the inside. . The function of the ascending colon is to promote food digestion and absorption. Its illness and health directly affect the digestion and absorption of nutrients.

Chinese name

Ascending colon

Foreign name

ascending colon

nickname

Because it is located on the right side of the abdomen, also known as the right hemicolon

Ascending colitis

Colitis abdominal pain is mostly faint or colic, often located in the left lower abdomen or lower abdomen and other parts. Other manifestations include loss of appetite, bloating, nausea, vomiting, and hepatomegaly; the left lower abdomen may have tenderness and sometimes touch the spasm of the colon. Common systemic symptoms include weight loss, fatigue, fever, and anemia. A small number of patients in the chronic course of disease suddenly deteriorated or the first onset was fulminant, showing severe diarrhea, 10-30 times a day, excreted feces containing blood, pus, mucus, and had high fever, vomiting, and tachycardia Rate, failure, dehydration, electrolyte imbalance, coma, or even perforation of the colon, death can occur if left untreated.

Clinical manifestations:

(1) A large amount of blood in the stool

(2) Intestinal stenosis

(3) Intestinal perforation

(4) Toxic expansion

(5) Colon cancer

(6) Diarrhea

(7) Abdominal pain

(8) Constipation

(9) Other symptoms: abdominal distension, weight loss, fatigue, bowel sounds, insomnia, dreams, cold, severe cases may have fever, rapid heartbeat, and weakness, anemia, dehydration, electrolyte balance and nutritional disorders.

Clinical application of ascending colon ascending mirror technique

Discussion Colonoscopy is considered the gold standard method for detecting colonic lesions, and comprehensive and non-missing examinations are important. Due to the visual field limitation of the forward-looking enteroscopy, about 10% to 24% of the lesions may be missed. The ascending colon is deep and has unobservable areas. In the process of exiting the mirror, even if you pay attention to "repeated" and "left and right look" to observe, some "dead corners" after folds are difficult to observe. If you say "straight line" to withdraw the microscope without observing the dead angle behind the folds, then a colonoscopy can only observe about 40% to 50% of the intestinal mucosa, which is likely to cause missed diagnosis. It can be seen that the direct-view observation is not comprehensive when exiting the mirror. The inverted-view observation can make up for some of the shortcomings of the direct-view observation. When the visual field is unclear or there is a "dead angle" under the direct-view observation, a reverse-view inspection can be used to help us. Lesions of the ascending colon were found.
In this group of data, the detection rate of ascending colon lesions was 8.42%, and the majority were polyposis (including multiple polyps and LST), and tubular adenomas and villous tubular adenomas accounted for 73.43% of polyp lesions. Tumor detection rates are high, and both tubular adenomas and villous tubular adenomas are tumorous polyps with the potential to become cancerous. At the same time, we also found that in ascending colon cases, severe dysplasia accounted for 2.26% of ascending colon cases, while severe Dysplasia is a precancerous lesion. It can be seen that nearly 3% of the ascending colon lesions are precancerous lesions, especially the proportion of precancerous lesions in polyposis is as high as 6.87%. In this study, the intestinal collapse found 1.63% of the total number of lesions that were difficult to find when looking down and out of the mirror, suggesting that if the mirror is not performed, a missed diagnosis rate of nearly 2% will occur; and this 1.63% In many cases, pathological reports are often associated with atypical epithelium. If no delayed treatment is found, the importance of mirror technology in the examination of ascending colon disease can be seen.

The premise of ascending colon mirror is that the lens body is in a very smooth state, and no crusting and other phenomena appear. The single-person colonoscopy method uses the short-shrink method to perform the entire operation, leaving the colonoscopy in a free state, which provides a prerequisite for the mirror, so the success rate of the mirror is high, reaching 93.31% in this study. The air volume in the ascending colon should be moderate when performing a mirror examination. First, because the starting position of the inverted mirror is selected at the most spacious bottom position of the meditation part, and the cecum bowel cavity is wide, when excessive inflation occurs, sudden pressure increase is prone to perforation feeding; second, if inflated Excessive conditions under the mirror inspection, easy to cause bowel perforation. It is more likely to cause damage when the mirror is brought into the mirror with a cymbal. Care should be taken not to blindly perform the mirror under brute force. Stop when you encounter resistance. For those who are new to colonoscopy, those with severe inflammation of the intestine, and those who have adhesions after surgery, they must be handled with caution when inverted, or they must not be inspected. In general, as long as the operation is proper, the movements are gentle and smooth, and it is safer to perform the mirror under the condition of sufficient inflation to keep the intestinal cavity full. No related complications such as bleeding and perforation occurred in this study.
It can be seen that the inverted mirror technology combined with direct-looking and retrospective observation can perform a comprehensive examination of the ascending colon, which is not only conducive to the detection and observation of lesions, but also facilitates the treatment of some special lesions in some special cases. Therefore, we believe that the ascending colonoscopy technique can be classified as one of the basic operation methods of colonoscopy.