Perioperative Complications and Their Management



Fig. 17.1
Avoidance of dissection injury of the gastroesophageal junction requires careful retraction, identification of critical structures, precise dissection, and careful use of energy. An angled laparoscope allows dissection behind the GEJ to be performed under direct vision



Incorrect traction on the stomach and esophagus during passage of a bougie for sizing the fundoplication can result in severe angulation of the distal esophagus or proximal stomach and possible subsequent perforation (Fig. 17.2). Bougies and nasogastric tubes should be placed always under laparoscopic view, by experienced medical personnel and with direct communication by the surgery team.

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Fig. 17.2
Passage of a bougie or nasogastric tube must be done carefully after hiatal closure. Angulation of the distal esophagus must be controlled by axial traction or perforation can occur. (1) Nasogastric perforation of distal esophagus during laparoscopic Heller myotomy (2) Bougie perforation at the anterior GE junction due to closure of the hiatus and improper retraction (3) Bougie perforation of the posterior distal esophagus due to closure of the hiatus and improper retraction (4) Proper caudad and anterior laparoscopic retraction of the stomach during insertion of bougie (from Lowham et al. mechanisms and Avoidance of Esophageal Perforation by Personnel During Laparoscopic Foregut Surgery, Surg Endosc 1996, printed with permission) [12]

If the perforation is recognized and repaired the post-operative course should be uneventful with an unchanged functional outcome. When the perforation is detected intraoperatively the repair can and should be easily performed by primary closure, which is then incorporated in the fundoplication wrap.

The greatest threat to the patient is an unrecognized perforation. The presenting signs and symptoms may differ from classical teachings about the acute abdomen. Post-operative upper gastrointestinal series may also be misleading. Even in the absence of obvious radiological, biological, and peritoneal signs of sepsis, a high level of suspicion should be there for patients presenting with persistent, and relatively increased, post-operative pain, tachycardia and/or respiratory distress; since these symptoms are better indicator of a potential complication than history, labs, or examination. In these patients a diagnostic laparoscopy should be a first approach and should include a systematic exploration of the wrap and the esophagus. If no obvious source of spillage is detected the fundoplication and the crural repair should still be taken down to fully assess the gastric and esophageal integrity as, on occasion, a small, contained leak may be the problem. In case of an esophageal leak which is not amenable to a sound primary suture repair, or a staple line leak after a Collis gastroplasty, the use of a covered self-expanding metal stent (SEMS) is recommended. Endoscopic stenting can be the sole form of treatment in the absence of large abscess or peritoneal contamination. Additional image-guided percutaneous drainage or re-operation should be performed to control significant mediastinal or abdominal contamination.

Prevention of these potentially serious complications requires a full understanding of the detailed anatomy of the gastroesophageal region, awareness of the recognized mechanisms of perforation and a meticulous surgical technique [13]. Subtle and possibly serious vital sign changes, combined with post-operative pain, increased narcotic medication use and antibiotics can obscure intra-abdominal processes, creating a diagnostic dilemma for even the most experienced surgeon. Surgeons should bear in mind that consequences accompanying esophageal perforation make this complication a prime litigation target. The requirement of surgical repair and a delay in diagnosis are two of the most common factors present in litigated cases resulting in a payment. All patients should therefore have a frank discussion about the possibility of complications such as esophageal perforation, during their informed consent for surgery.



Bleeding


Significant bleeding during surgery is uncommon and usually is easily controlled laparoscopically. It mainly occurs during short gastric division, when mobilizing the fundus of the stomach. Splenic injuries may occur during this dissection, but the need for incidental splenectomy is rare and dropped from 10 % during open surgery to less than 1 % for laparoscopic surgery [14]. This fortunate decrease is probably related to the improved exposure and vision provided by laparoscopy together with the dramatic change in energy instrumentation that allows a more straightforward technique to complete this step of the operation.


Acute Dysphagia


Dysphagia is a common side effect of fundoplication. Usually self-limiting, post-operative dysphagia is reported by 10–90 % of patients to varying degrees [15, 16]. Post-operative tightening of the gastroesophageal junction due to edema: with consequent slower emptying is normal due to local edema and esophageal trauma. In fact, dysphagia should probably be considered a normal consequence of the fundoplication, and can typically last up to 6 weeks. It is usually well managed by dietary advice with a soft food diet being mandated by most surgeons for the first month or so. Severe dysphagia with important weight loss or dysphagia during this period should be investigated.

We believe that a water soluble upper X-ray study should be performed in every patient on post-operative day one to confirm the position of the fundoplication and assess the passage of the contrast into the stomach. If the exam shows contrast passing into the stomach, albeit slowly, and a correct sub-diaphragmatic position of the antireflux valve and stomach, a conservative approach can be followed even if the patient has significant dysphagia, and swallowing will usually improve over the ensuing few days (Fig. 17.3). Steroids are often effective for early dysphagia due to edema and can often relieve the obstruction and accelerate recovery. However, if absolutely no contrast passes into the stomach, early endoscopy and/or laparoscopic exploration is recommended to rule out technical flaws; such as too tight a crural repair, too tight or twisted a fundoplication, or too long a valve. In addition, other possible causes of dysphagia such as a malposition or a displacement of the valve (slippage) can only be ruled out by re-exploration.

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Fig. 17.3
Early dysphagia is normal post-fundoplication and an upper GI X-ray will often show slow emptying of the esophagus due to edema. This usually responds to conservative treatment with liquid diet and sometimes steroids

The choice of early endoscopic dilatation in this setting is controversial. Severe acute dysphagia is not tremendously likely to respond to conservative treatments like dilatation, but it is a well tolerated, a benign intervention, helpful in the identification of the underlying problem, and occasionally works.


Pneumothorax


Pneumothorax, or more precisely capnothorax, is not to be considered a complication but rather a side effect of a complex mediastinal dissection. During such dissections, it is not unusual to tear one or both pleura when mobilizing the intrathoracic esophagus especially in patients with severe periesophagitis, large hiatal hernia, and previous operations. The consequences are negligible because the CO2 is easily controlled with positive pressure ventilation and is quickly resorbed. In most patients pneumothorax is asymptomatic and does not compromise patients’ hemodynamic and ventilatory status. Certain patients with poor pulmonary function or hemodynamic problems may represent more problematic management problems. Disciplined cooperation between anesthesiologists and surgeons is needed to ensure proper intra-operative management. PEEP modification can be used to manage the vast majority of cases of pneumothorax [16, 17]. Passage of CO2 into the pleura after injury is facilitated due to the existence of a pressure gradient; intra-abdominal pressure > intrapleural end-expiratory pressure. Application of PEEP decreases or reverses the gradient which prevents further CO2 build up. Being highly diffusible, the existing CO2 in the pleura is rapidly removed by the circulating blood. Also, re-expansion of the lung with PEEP mechanically seals the surgically induced tear in the parietal pleura. An index of suspicion, close clinical observation of airway pressure and end-tidal CO2, periodic auscultations of chest, and communication with the surgeon are needed to detect the rare occurrence of a tension pneumothorax which is potentially life threatening and needs prompt management with decompression by chest tube insertion or widening the pleural defect laparoscopically. Any attempt to seal a pleural tear should be avoided in order to prevent an iatrogenic tension pneumothorax.

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May 30, 2017 | Posted by in GASTROENTEROLOGY | Comments Off on Perioperative Complications and Their Management

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