Trial Information

Prospective Randomized Controlled Trial Comparing Side to Side Stapled and Hand Sewn Esophagogastric Anastomosis in the Neck

Hypothesis:

Side-to-side stapled anastomosis will decrease anastomotic leak rate by 15% compared to hand
sewn technique in cervical esophagogastric anastomosis

Background:

Following esophagectomy or esophageal bypass, restoration of continuity by gastric
interposition with cervical esophagogastric anastomosis (CEGA) can be done either by a
hand-sewn or stapled anastomosis. Regardless of the surgical approach, decreasing
anastomotic complications is essential for minimizing early morbidity and improving
long-term functional results and quality of life. Cervical esophagogastric anastomosis
almost eliminates the risk of postoperative mediastinitis associated with anastomotic leaks.
Further, 98% of CEGA leaks can be managed successfully with local wound care (1), and less
than 2% are associated with serious complications such as gastric tip necrosis, cervical
vertebral osteomyelitis, epidural abscess and tracheogastroesophageal fistula, etc (2).
Though early complications of CEGA are less, the long-term sequelae such as anastomotic
stricture occur in nearly half the patients with an anastomotic leak. The need for life long
esophageal dilatation negates the benefit of an operation intended to relieve dysphagia. The
cause of anastomotic dehiscence in CEGA is possibly multifactorial (3,4) with both local
tissue and systemic factors are being implicated. As the esophagus has no serosa, its
longitudinal muscles hold sutures poorly and the awkward surgical exposure, possibly
contribute to the higher anastomotic leak rates. Surgical technique is thus likely to play
an important role. The incidence of CEGA leakage with hand sewn has been reported from 15%
to 25% (5). While the stapled anastomosis is considered to be more expedient, less traumatic
to tissues, with lower leak rates and associated with less mortality and morbidity, they are
criticized for increased cost and high stricture rates. Most reports prior to 2000 showed
identical leak rates in patients having a hand-sewn or stapled anastomosis with higher
stricture rate in the stapled group (6-8).

With recent technical refinements the CEGA has been performed in side-to-side
manner using the Auto-Suture Endo-GIA 30-3.5 stapler. Following side to side anastomosis the
leak rates have been reported to be less than 5%, with lower incidence of anastomotic
stricture after leak and improved satisfaction in swallowing compared to hand sewn technique
(9). These studies were retrospective and demanded a randomized trial to confirm the
results. We therefore planned a randomized trial comparing the anastomotic sequelae after
hand-sewn anastomosis with mechanical stapled side-to-side anastomosis

Objective:

To compare the rates of anastomotic leaks and postoperative benign stricture after CEGA done
by hand-sewn (end-to-side) technique or by linear stapled anastomosis (side-to-side)
technique.

PATIENTS AND METHODS:

All the patients who attended outpatient department of GI Surgery with complaints of
dysphagia will be evaluated for esophageal disorder. After confirming the diagnosis of
esophageal cancer and decision of esophagectomy, patients will be included in our study.

Inclusion criteria i Any patient with resectable carcinoma of the mid or lower thoracic
esophagus and gastro-esophageal junction. ii Benign esophageal lesion where esophageal
resection was beneficial and feasible.

Exclusion criteria i Patients who had upper thoracic or cervical esophageal carcinoma ii
Unresectable lesions (T4/M1) iii Prior gastric surgery iv Poor performance status (ECOG 3,4)
Sample size calculation The number of patients to be included was calculated to be 87
patients in each group based on the assumption that anastomotic leak rate will be reduced to
5% using side-to-side stapled anastomosis. The sample size was calculated by the formula for
a power of 80% and alpha error of 0.05.

They will be randomly divided into two groups using computer generated random numbers.

Group A Hand sewn anastomosis; Group B Stapled anastomosis Written informed consent will be
obtained from each patient before entry into the study.

Diagnostic work up and preoperative preparation The diagnostic work-up will include barium
swallow, upper gastrointestinal (UGI) endoscopy and biopsy (where malignancy was suspected),
hypopharyngoscopy (for corrosive stricture of esophagus), as well as haemogram, serum
chemistry, liver function tests, ECG, chest x-ray and pulmonary function tests. In the
malignant group, preoperative imaging will also include computed tomography (CT) scan from
the neck to the upper abdomen including the liver and celiac axis. Preoperative nutrition
will be maintained and if required a ryle tube or feeding jejunostomy will be done.
Incentive spirometry, steam inhalation, bronchodilators and antibiotics will be used to
improve the pulmonary status as required.

At surgery, the operative procedures, time taken for anastomosis and total operating time
will be recorded. After surgery, patients will be assessed for anastomotic leakage by a
radiographic contrast (gastrografin) study to be performed on seventh postoperative day.
Anastomotic leakage will be defined as a radiological defect at the anastomotic site or
leakage of swallowed fluid out of the drain site or cervical wound. Other complications,
including cardiopulmonary morbidity, septic complications, duration of hospital stay after
surgery and operative mortality will also be studied. Operative mortality included all
patients who will die within 30 days of the procedure or during the same hospital admission.
Anastomotic stricture will be defined as failure to pass the esophagoscope through the
anastomosis or anastomotic narrowing requiring dilatation to relieve dysphagia.

Surgical technique:

The surgical approach will be either transhiatal or transthoracic esophagectomy. The gastric
conduit will be prepared based on the right gastric and right gastroepiploic vessels and
pyloromyotomy and pyloroplasty will not performed except in patients with corrosive
strictures. Finger dilatation of pylorus will be done when required. The conduit will be
prepared using 75-mm linear cutter. The stomach will be brought up into the neck through
either the retrosternal or posterior mediastinal route. The CEGA will be done by a
side-to-side stapled or end-to-side hand-sewn method. Chest tubes (32F) will be inserted
bilaterally to take care of any breach in the pleura. Feeding jejunostomy (Witzel's type)
with 12F Malecot's catheter will be done in all patients. The neck wound will be closed
loosely with interrupted 3-0 vicryl sutures over a 14F suction drain and the skin will be
approximated with skin staplers.

Hand-sewn anastomosis: A proper site on the anterior wall of stomach away from the stapled
line approximately 2 cm below the highest point of the gastric conduit will be anastamosed
to esophagus Posterior interrupted seromuscular sutures will be taken with 3-0 silk. The
stomach will then be opened transversely (2.5 to 3 cm long). Interrupted stitches with full
thickness of the stomach and esophagus will be placed to achieve mucosa to mucosa
approximation. A 16F nasogastric tube will then be placed across the anastomosis into the
intrathoracic stomach. The anterior wall of the anastomosis will be completed in a manner
similar to posterior wall.

Stapled anastomosis: At least 5 cm of the mobilized stomach will be placed in the neck.
Three interrupted seromuscular sutures will be taken between the posterior wall of the
esophagus and anterior wall of stomach well away from the gastric staple line. A 1.5 cm
gastrotomy will be made. Two stay sutures will then be taken, one at the anterior corner of
the esophagus and another between the posterior corner of esophagus and the middle of the
gastrotomy. These stay sutures will be retracted downwards as the stapler device (using
Endopath, EZ45 Endoscopic Linear Cutter) will be introduced, the thinner portion into the
stomach and the thicker staple-bearing portion into the esophagus. The staple cartridge will
then be rotated so that the posterior wall of the esophagus and the anterior wall of the
stomach will align in a parallel manner, keeping the site of the anastomosis well away from
the gastric staple suture line and fire the stapler. A 16F nasogastric tube will be placed
across the anastomosis into the intrathoracic stomach, and the anterior edges of the
gastrotomy and open esophagus will be approximated in two layers with interrupted 3-0 silk.

Postoperative management: The nasogastric tube will be removed on the 3rd postoperative day.
Jejunostomy trial feed will be started intestinal activity will appear. If there is no
obvious leak, bedside test feeding with water will be done on the 5th postoperative day. If
bedside test feeding shows no leak, oral feeding will be started gradually with water,
banana, curds and soft diet. A contrast study will be done on the 7th postoperative day
unless there is an obvious anastomotic leak. The neck drain will be removed after the
contrast study. If a leak is identified, the cervical wound will be opened to establish
external drainage of any cervical abscess and anastomotic fistulae. Regular dressing with
normal saline soaked gauze will be done. If there is no clinical leak but the contrast study
shows a contained leak (type 1 leak), patients will be managed conservatively without
opening the cervical wound.

Follow up:

All patients will be followed one week after discharge and at 3-month intervals for the
first two years. Routine clinical examination, hemogram and liver function tests will be
done in all patients. Dysphagia will be assessed with barium swallow and esophagoscopy.
Anastomotic strictures will be dilated with endoscopic or by a Foley catheter balloon (This
technique has been adapted for home based self dilatation) (10).

Statistical analysis:

Continuous variables will be reported as Mean with Standard Error of Mean (SEM). Categorical
variables will be reported as proportions. Student's t test, Chi-square tests and Fisher's
exact test where appropriate will be used for comparison between groups. A p value of 0.05
or less will be regarded as significant.

REFERENCES

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Thorac Surg 1986;42:536-9

2. Iannettoni MD, Whyte RI, Orringer MB. Catastrophic complications of the cervical
esophagogastric anastomosis. J Thorac Cardiovasc Surg 1995;110:1493-1501

3. Dewar L, Gelfand G, Finley RJ, Evans K, Inculet R, Nelems B. Factors affecting cervical
anastomotic leak and stricture formation following esophagogastrectomy and gastric tube
interposition. Am J Surg 1992;163:484-9

4. Gupta NM, Gupta R, Rao MS, Gupta V. Minimizing cervical esophageal anastomotic
complications by a modified technique. Am J Surg 2001;181:534-9

5. Orringer MB, Marshall B, Iannettoni MD. Transhiatal esophagectomy: clinical experience
and refinements. Ann Surg 1999;230:392-403

6. Fok M, Ah-Chong AK, Cheng SW, Wong J. Comparison of a single layer continuous hand-sewn
method and circular stapling in 580 oesophageal anastomosis. Br J Surg 1991;78:342-5

7. Law S, Fok M, Chu KM, Wong J. Comparison of hand-sewn and stapled esophagogastric
anastomosis after esophageal resection for cancer: a prospective randomized controlled
trial. Ann Surg 1997;226:169-73

8. Beitler AL, Urschel JD. Comparison of stapled and hand-sewn esophagogastric
anastomoses. Am J Surg 1998;175:337-40

9. Orringer MB, Marshall B, Iannettoni MD. Eliminating the cervical esophagogastric
anastomotic leak with a side-to-side stapled anastomosis. J Thorac Cardiovasc Surg
2000;119:277-88

10. Shad SK, Gupta S, Chattopadhyay T Self-dilatation of cervical oesophagogastric
anastomotic stricture: a simple and effective technique. Br J Surg 1991;78:1254-5