eMedicine Specialties > Gastroenterology > Intestine
Afferent Loop Syndrome: Treatment
Updated: Nov 16, 2009
Treatment
Medical Therapy
Acute ALS
In patients with acute ALS, a favorable outcome is correlated with an expedient diagnosis and corrective surgery. Medical therapy has no role, although nasogastric tube drainage may temporarily provide relief of symptoms while patients are resuscitated before surgery. Kim et al reported a case of a 67-year-old patient with ALS and coexisting acute pancreatitis who was not felt to be an ideal surgical candidate.47 As a result, the patient was treated with an endoscopically placed nasogastric/enteric tube, with excellent relief of symptoms.
Chronic ALS
Patients with chronic ALS can be severely malnourished and anemic. These patients may benefit from preoperative specialized nutritional support or transfusion before undergoing corrective surgery. However, surgery should not be delayed if symptoms and signs consistent with complete obstruction develop.
Surgical Therapy
The treatment of ALS is surgical. Conservative measures can be temporarily used to resuscitate the patient, but the definitive treatment is corrective surgery. When ALS is caused by recurrent or unresectable malignancies, successful palliation is frequently accomplished using interventional radiologic techniques. Several references are described in the preceding section.
Surgical correction is effected by deconstructing the Billroth II gastrojejunostomy and restoring gastrointestinal continuity with an alternate method. Several procedures have been described, but the 2 predominant operations are Billroth I gastroduodenostomy and Roux-en-Y gastrojejunostomy.
Interestingly, based on their retrospective study of 19 patients with postgastrectomy syndromes of whom 3 had ALS, Borrelli et al reported a significant proportion of patients required minor surgical intervention.48 The authors raised the question that in selected patients, laparoscopic surgery may be considered.
Vettoretto and associates reported a case of afferent loop obstruction caused by an adhesive band following distal gastrectomy and reconstruction for gastric cancer.49 The authors performed diagnostic laparoscopy and laparoscopic lysis of adhesions, resulting in resolution of the ALS.
Aimoto and colleagues described 2 cases of malignant ALS in patients who had undergone pancreaticoduodenectomy.50 In both patients, recurrence of pancreatic cancer was found at laparotomy. Bypass procedures were performed in each case to effect palliation.
Consultations: Early consultation with a surgeon is mandatory.
Preoperative Details
The patient is properly identified. The patient (or a legal representative) is counseled about the operation and signs the informed consent documents.
Intravenous access is established, and intravenous fluid resuscitation is begun. A nasogastric tube is placed to decompress the stomach, and preoperative antibiotics are administered.
Intraoperative Details
Billroth I gastroduodenostomy
This procedure creates a direct anastomosis between the stomach and duodenum. It is the most physiologic procedure and is therefore the operation of choice. Several factors may preclude its use, including previous subtotal gastrectomy or extensive scarring around the duodenum. In these situations, the surgeon may be unable to gain enough mobility on the stomach and duodenum to create an anastomosis without excessive tension.
Roux-en-Y gastrojejunostomy
For a Roux-en-Y gastrojejunostomy, the jejunum is divided several centimeters distal to the ligament of Treitz. The proximal portion of the distal jejunal segment is anastomosed to the stomach. The distal end of the Roux limb is anastomosed to the distal jejunal segment. This jejunojejunostomy is created approximately 40 cm downstream from the gastrojejunostomy in order to minimize the possibility of developing alkaline (bile) reflux gastritis.
Van Stiegmann and Goff described a variant of this operation in which the jejunum is not divided.51 This is the so-called uncut Roux-en-Y gastrojejunostomy. The procedure was developed to avoid Roux stasis syndrome, which was thought to be caused by interruption of jejunal intestinal pacesetting potentials.
In an uncut Roux procedure, a loop gastrojejunostomy is fashioned. The afferent limb of this loop is occluded—but not divided—by a staple line. A jejunojejunostomy is made between the afferent and efferent jejunal limbs just proximal to the occluding staple line. This operation has not gained wide acceptance, partially because of the problem of dehiscence of the occluding staple line, as reported by Mulholland and colleagues.52
Other surgical procedures
The following remedial operations have also been used:
- Revision of the gastrojejunostomy
- Side-to-side enteroenterostomy
- Jejunal segment interposition (between the gastric remnant and duodenum to create a modified Billroth I–type anastomosis)
- Resection of the redundant portion of the afferent jejunal loop
Postoperative Details
Intravenous fluids
Resuscitative and maintenance intravenous fluids are provided postoperatively. These are usually administered as a balanced salt solution (eg, lactated Ringer solution). If the patient has hypochloremic metabolic alkalosis due to nasogastric suctioning or other causes, normal saline can be substituted. Intravenous fluid support is continued until the patient successfully resumes oral intake.
Activity
Early activity, including arising from the bed to a chair and ambulating frequently, is encouraged.
Diet and nutrition
Patients are kept nil per os (NPO) for varying durations depending on the preference of the operating surgeon. Because correction of ALS entails reoperative gastric and small bowel surgery, many surgeons choose to advance patients slowly.
Following nasogastric tube removal, patients can be started on liquids and advanced to a full diet as tolerated. Postgastrectomy diet counseling by a registered dietitian is helpful. Patients may find that they tolerate 5-6 smaller feedings per day better than the traditional 3 meals.
Depending on the patient's preoperative nutritional status, a period of specialized nutritional support might be warranted. This can range from enteral tube feedings to peripheral hyperalimentation to total parenteral nutrition. In addition, multivitamin and iron supplementation may be indicated.
Drains
A nasogastric tube is typically left in place postoperatively. Ensuring that the tube functions continuously and remains unclogged is crucial. Criteria for removal of a nasogastric tube include diminishing output and return of bowel function as manifested by bowel sounds or the passage of flatus.
A Foley catheter remains in place in the early postoperative period to monitor hydration status and to serve as a guide for fluid resuscitation. Once the patient is stabilized and no further major fluid shifts occur, the catheter can be removed.
Pulmonary toilet
Instruct patients to cough and to take frequent deep breaths. The incentive spirometer is an important adjunct and should be used every 1-2 hours while the patient is awake. Early mobilization of the patient assists with maintaining good pulmonary toilet.
Monitoring
Vital signs are monitored per protocol. Intake and output records are kept to monitor intravenous fluids given, oral intake, and urine and nasogastric tube outputs. Pulse oximetry may be used to measure oxygen saturation.
Antibiotics
Unless bowel perforation has occurred, a single dose of antibiotics as prophylaxis against wound infection usually suffices. Patients with abdominal catastrophes, such as bowel perforation or infarction, require a full course of antibiotic therapy aimed at gut flora.
Pain control
An epidural catheter can be placed by anesthesia personnel for postoperative pain control. Alternately, a patient-controlled anesthesia regimen can be ordered.
Deep venous thrombosis prophylaxis
Prophylaxis against deep venous thrombosis is crucial because deep venous thrombosis and pulmonary embolism are significant sources of postoperative morbidity and mortality. Available modalities include subcutaneous heparin, subcutaneous fractionated heparin preparations, and sequential compression stockings.
Aspiration precautions
The head of the bed can be kept elevated at 30-45° or sometimes higher in elderly patients or during sleep.
Follow-up
The operating surgeon should monitor patients to ensure that wound healing is complete and that no signs of infection arise. Patients are questioned about eating and elimination habits and are weighed to ensure that proper nutritional status is maintained.
Gastric emptying
Patients with persistent delayed gastric emptying or gastroparesis may report early satiety, epigastric fullness, nausea, or vomiting. Abdominal pain may be present. According to Gustavsson and associates, up to 30% of patients undergoing revision with a Roux-en-Y gastrojejunostomy develop one or more of these symptoms.5 This has been termed Roux stasis syndrome.
The workup for Roux stasis syndrome or simple gastric atony begins with upper gastrointestinal contrast studies to exclude a source of mechanical obstruction. Upper endoscopy can help determine if the patient has a mechanical problem (eg, anastomotic stricture). Radionuclide imaging is useful to confirm the diagnosis.
Conversely, patients may develop signs and symptoms of dumping syndrome following corrective surgery. While the diagnosis is primarily made based on clinical findings, radionuclide imaging helps confirm the diagnosis by demonstrating rapid gastric emptying.
Treating altered gastric emptying
For delayed gastric emptying, agents such as erythromycin and metoclopramide have been used with varying degrees of success. Patients with dumping syndrome can be given a low-carbohydrate diet and are instructed to limit fluid intake during meals. A somatostatin analog administered before meals has been successful in controlling dumping-related symptoms.
Hematopoiesis
CBC count and RBC characteristics are monitored. Patients with loss of parietal cell mass and bypass of the proximal small bowel may require supplemental iron and vitamin B-12.
Complications
Patients undergoing surgery for ALS are at risk for developing any of the following complications:
- Wound infection
- Wound dehiscence with or without evisceration
- Urinary tract infection
- Atelectasis
- Pneumonia
- Anastomotic disruption
- Anastomotic stricture
- Marginal ulceration
- Intra-abdominal abscess formation
- Cholangitis
- Delayed gastric emptying/gastroparesis
- Internal or enterocutaneous fistulae
- Small bowel obstruction
- Dumping syndrome
- Alkaline reflux gastritis
- Roux stasis syndrome
- Cardiac arrhythmias
- Deep venous thrombosis
- Pulmonary embolism
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References
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Further Reading
Keywords
afferent loop syndrome, ALS, Billroth II gastrojejunostomy, hernia, volvulus, intussusception, blind loop syndrome, proximal loop syndrome, postgastrectomy syndromes, late dumping syndrome, intestinal obstruction,
postvagotomy diarrhea, chronic gastric atony, Roux stasis syndrome, small gastric remnant syndrome, alkaline reflux gastritis, efferent loop syndrome, peptic ulcer disease, PUD, gastrojejunal loop obstruction, gastrojejunostomy, Billroth II-type gastrectomy, pancreaticoduodenectomy, esophagogastroduodenoscopy, EGD, Billroth I gastroduodenostomy, Roux-en-Y gastrojejunostomy
Treatment: Afferent Loop Syndrome