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ISSN: 2161-1076
Surgery: Current Research
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Fatal Adult Necrotizing Enterocolitis Associated with Fecal Impaction Case Presentation and Short Review

Mohamed Saleh*, Philippe Pauquet and Didier Thévenin

Intensive Care Unit, Centre Hospitalier d’Arras, Arras, France

*Corresponding Author:
Mohamed Saleh
Intensive Care Unit
Centre Hospitalier d’Arras, France
E-mail: [email protected]

Received date: December 12, 2013; Accepted date: December 28, 2013; Published date: January 07, 2014

Citation: Saleh M, Pauquet P, Thévenin D (2014) Fatal Adult Necrotizing Enterocolitis Associated with Fecal Impaction Case Presentation and Short Review. Surgery Curr Res 4:156. doi:10.4172/2161-1076.1000156

Copyright: © 2014 Saleh M, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Keywords

Necrotizing enterocolitis in adults; Neuroleptics; Constipation

Background

Necrotizing enterocolitis in adults is rare and has been associated with post operative ileus more than forty years ago [1,2]. More recently, drugs having anticholinergic properties -especially neuroleptics-have been associated with necrotizing enterocolitis. This potentially fatal [3] side effect has been associated with phenothiazines as well as new atypical neuroleptics [4-6]. By reviewing medical and surgical literature we could not find consensus about definition, diagnosis and management of neuroleptics-associated necrotizing enterocolitis. This might be due to disease rarity and recognition only via isolated case reports or series. However, this rare but potentially fatal condition might be challenging for medical and surgical teams. Here we report a fatal case of documented neuroleptics associated necrotizing enterocolitis without obvious macroscopi evidence of intestinal necrosis or ischaemia despite two abdominal surgical explorations.

Case Presentation

A 29 years old female patient presented with acute abdominal pain and vomiting in our hospital emergency room. She complained of symptomatology, which included alternating diarrhea and constipation in the week before admission in our hospital. Her surgical past history was non-contributory. She had a long-term medical history of major depression and several suicide attempts. She was admitted in residential care facility seven days ago for treatment adjustment. Her treatment consisted of a combination of one tricyclic

Antidepressant, two phenothiazine-based neuroleptics and prophylactic anti-tremors treatment with one anticholinergic agent.

No stool softener or recent antibiotic treatment figured in her treatment. In emergency room the patient was obnubilated, Glasgow coma scale score was 12/15, pulse rate was 145 beats per minute, blood pressure was 90/45 mmhg, central body temperature was 37, 1°C and oxygen saturation was 97% with no oxygen supply needed. Body weight and height were 52 kg and 145 cm, respectively. Her abdomen was markedly is tended and painful on superficial and deep palpation. Shortly after emergency room admission, the patient collapsed and became comatose. She needed fluid resuscitation and nor epinephrine infusion. The diagnosis of abdominal related septic shock was suspected. The patient was sedated, incubated and mechanically ventilated.

Initial Investigations and Management

Arterial blood gases analysis results were as follow: pH 7, 18, PO2 96 mmhg, PCO2 39 mmhg, base excess -13 mmol/l, HCO3-14 mmol/l. Initial blood lactate was 3 mmol/l (Our laboratory reference value is < 2 mmol/l). Kidney and liver function tests were within normal range. Serum lipase and amylase were also within normal range. Serum procalcitonin was 1,9 ng/ml (Normal range < 0,5 ng/ml). Complete blood count showed hemoconcentration (Hb 16 g/dl) and mild hyperleukocytosis (white blood cells count 18000/mm3).

Blood coagulation tests were within normal range.Pregnancy test was negative. Chest X-rays, urine analysis and lumbar puncture showed no signs of extra-abdominal sepsis. Contrast-enhanced abdominal CT (Figures 1 and 2) showed important small and large intestine distension associated with multiple zones of fecal impaction. No signs of perforation or peritonitis were present. Our local surgical team recommended conservative medical treatment which consisted of hemodynamic support, large spectrum antibiotic treatment and nasogastric tube suction.The patient was then admitted in ICU for management.

surgery-current-research-conspicuously

Figure 1: Contrast-enhanced abdominal CT

surgery-current-research-abdominal

Figure 2: Contrast-enhanced abdominal CT

First day investigations, follow-up and management

Serial blood cultures were negative. Stool culture for salmonella, shigella, yersinia, campylobacter and c.perfringens was negative. C.difficile A and B toxins were absent. Serum procalcitonin and lactate values rose to 55 ng/ ml and 6 mmol/l respectively. On the contrary, complete blood count showed 8000 leukocytes/mm3 and kidney and liver function tests as well as blood coagulation tests remained unchanged. The patient had persistent severe circulatory failure in relation to severe vasoplegic shock documented by echocardiography. Large spectrum antibiotic treatment by a piperacillin-tazobactam combination in association with amikacin was given. Optimal norepinephrine needed dose rose rapidly to reach 15 mg/h. Our ICU team proposed urgent surgical exploration of the abdomen. Laparatomy showed no areas of macroscopic intestinal ischaemia or necrosis despite severe circulatory failure. Exploration of internal genital apparatus yielded normal findings. A small amount of clear peritoneal fluid was found. No intestinal resection was done. Peritoneal fluid culture remained negative.

Next two days investigations, follow-up and management

Blood tests showed persistent metabolic lactic acidosis, diffuse intravascular coagulation and leukopenia (white blood cells count 1200/mm3). Bacteroides uniformis was isolated in one blood culture made on the third day of admission. On the contrary, liver and renal function tests remained unchanged despite a worsening haemodynamic failure. A second contrast-enhanced abdominal CT showed diffuse thickening and infiltration of small and large intestine wall in addition to pneumatosis intestinalis in the ileum and the ascending colon (Figure 3) these findings were highly suggestive of necrotizing enterocolitis. A second look surgery was attempted on the third day. Macroscopic examination of the whole bowel was again noncontributory. The patient presented refractory shock and died on the fourth day of admission. Autopsy couldn’t be done.

surgery-current-research-infiltration

Figure 3: A second contrast-enhanced abdominal CT showed diffuse thickening and infiltration of small and large intestine wall in addition to Pneumatosis intestinalis in the ileum and the ascending colon

Discussion

The relation between fecal impaction, mental illness and necrotizing enterocolitis was underlined by Bos et al. [7] in a case series of three patients treated with neuroleptics. All patients were victims of food borne outbreak of enterotoxigenic C.perfringens typeA infection. Two out of their three patients died. Few weeks later Sobel et al. [8] presented a second case series of four previously healthy adults who were victims of C.perfringens type A necrotizing enterocolitis related to food borne illness. Three patients out of four died. Despite differences between patients populations theses two case series reported a high mortality rate and pointed out the possible role of C.perfringens type A as causative agent of adult necrotizing enterocolitis with or without fecal impaction. Y reviewing other recent neuroleptics-associated necrotizing enterocolitis, the presence of enterotoxigenic C.perfringens type A seemed not to be mandatory for disease occurrence [5,6]. One possible mechanism of disease occurrence in such cases could be prolonged gastrointestinal hypo motility and constipation due to anticholinergic side-effect. This leads to ischemia by increasing intraluminal pressure and compression of mucosal vessels. As a sequel, bacterial translocation, inflammation and ischemia of the segment of bowel proximal to the obstruction. In our patient no specific bacterial agent could be identified. The occurrence of Bacteroides uniformis septicaemia late in the disease course might reflect bacterial translocation due to alteration of intestinal barrier and high intestinal anaerobic bacterial load. The absence of food borne outbreak illness in the patient’s residential care facility and the absence of C.perfringens on stool culture argue against implication of C.perfringens type A in the disease pathogenesis.

By opposition to cases reported by Bos et al., [7] the macroscopic examination of our patient’s small and large bowel on laparotomy was “normal” despite the presence of signs of small and large bowel necrosis on abdominal CT and severe abdominal related septic shock. A similar finding was reported by Rathat et al., who treated their patient with hyperbaric oxygen therapy [1]. This highlights the importance of mucosal examination to guide surgical resection of the necrotic segment. Mucosal examination in cases of bowelischaemia associated with acute vascular occlusion is usually done before surgery to guide necrotic intestinal segment resection. This would not be feasible for obvious reasons in cases associated with fecal impact. In the presence of organ failure, when macroscopic examination is “normal” and necrotizing enterocolitis related to fecal impaction is documented on abdominal CT examination several questions need answers:

• Could CT-guided intestinal resection be a reasonable option?

• Could repeated macroscopic examinations by one or more surgical

• Explorations are helpful to unmask necrotic segments?

• Finally, could initial CT-guided resection followed by a second or third look surgery be life-saving?

Until answering these questions, clinician should be aware of this potentially fatal condition presenting sometimes with initial benign clinical picture. In the absence of definite medical and surgical management guidelines, surgical management of necrotizing enterocolitis associated with fecal impaction depends on operator experience and skills especially in borderline cases.

Finally, the bowel health of patients receiving medications that may cause constipation should closely monitored, and stool softeners should be prescribed as needed. The term neuroleptics-associated necrotizing enterocolitis might be misleading. A more accurate descriptive name of the the disease would be “Constipation-associated necrotizing enterocolitis”.

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