An abdominal abscess is a collection of cellular debris, enzymes, and liquefied remains which can be from an infection or non-infectious source. An intra-abdominal abscess usually signals that something serious is happening to the patient. An abscess can develop almost anywhere in the abdomen but are usually confined to some part of the peritoneal cavity. In many cases, the omentum, viscera, or mesentery may wall off an intraabdominal abscess. An abdominal abscess is quite common and is a serious condition. To avoid the high morbidity and mortality, the condition must be promptly diagnosed and treated. In general, sepsis that occurs after perforation in the upper gastrointestinal (GI) tract or leak is often associated with less morbidity and mortality compared to leaks that result from a colonic perforation or injury.
The most common organisms involved in an abdominal abscess include a mixture of aerobic and anaerobic bacteria that originate from the gastrointestinal tract. Causes of an intraabdominal abscess include perforation of a gastric ulcer, perforated appendicitis, diverticulitis, ischemic bowel disease, pancreatic necrosis, or gangrenous cholecystitis. Other common causes include penetrating abdominal trauma, surgical trauma, anastomotic leaks, volvulus, intussusception, or a missed gallstone during a cholecystectomy. Less frequently sterile abscess can result from the injection of a drug.
Organisms involved in an abdominal abscess include the following:
In most cases, intra-abdominal abscesses derive from an intra-abdominal organ and often develop after operative procedures. It is estimated that about 70% are postsurgical and that 6% of patients undergoing colorectal surgery may develop a postoperative abscess. Hepatic abscesses account for 13% of all intra-abdominal abscesses. Most hepatic abscesses involve the right lobe, probably due to the larger size and greater blood supply.
An intra-abdominal abscess may be confined or generalized within the peritoneal cavity. Localized collections of pus may have a barrier that may include adhesions, omentum or other adjacent viscera. In almost all cases, abdominal abscesses contain a polymicrobial collection of both aerobic and anaerobic organisms from the GI tract. The bacteria usually incite an inflammatory reaction that often results in a hypertonic environment that continues to expand as an abscess cavity. If left untreated, an abdominal abscess can lead to septic shock.
Patients with an intra-abdominal abscess may present with abdominal pain, fever anorexia, tachycardia or prolonged ileus. The presence of a palpable mass may or may not be present. If the presentation is delayed, some individuals may appear in septic shock.
If the abscess is retroperitoneal or located deep in the pelvis, there may be no clinical signs. In such cases, the only suspicion may be a fever, mild liver dysfunction, or prolonged ileus.
In post surgery patients, the diagnosis of an abdominal abscess is difficult because of analgesia and antibiotics which often mask the signs of an infection.
A subphrenic abscess may present with shoulder tip pain, hiccups, or atelectasis.
Most patients with an abdominal abscess will show signs of dehydration, oliguria, tachycardia, tachypnea, and respiratory alkalosis.
Blood work is not specific for an intra-abdominal abscess but may reveal leukocytosis, abnormal liver function, anemia or thrombocytopenia. These are features that signal an infection. Blood cultures are often negative but when positive may reveal predominantly anaerobic organisms, the most common being Bacteroides fragilis.
Plain abdominal x-rays are not sensitive for identifying an intraabdominal abscess and hence a CT scan is required and is considered to be the most definitive test to rule out an intra-abdominal abscess. A CT scan can reveal the location, size, and presence of bowel thickening, thumbprinting, and ileus. Intra-abdominal abscess almost always requires intravenous (IV) antibiotics. If the abscess is localized, CT-guided aspiration can be performed to drain the abscess. CT scan has the advantage that it avoids general anesthesia and wound complications. It also prevents contamination of other parts of the abdominal cavity.
In some patients, ultrasound may help identify abdominal abscess.
Nuclear scans are rarely used today to detect abscesses because the technique is time-consuming and has a high rate of false positives.
Broad-spectrum antibiotics and hydration are essential. Once cultures become, available one can use specific antibiotics as noted by their sensitivity. Intravenous hydration is required. A nasogastric tube may help decompress bowel and lower the emesis.
Percutaneous CT guided drainage is widely used to drain abdominal abscesses. The procedure can be done under local anesthesia and decreases the duration of hospitalization. In most patients, improve occurs within 48 hours after drainage. In localized abscesses, CT-guided drainage has a success rate of over 90%.
If the patients fail to improve within 24 to 48 hours, surgical consultation is required. Both laparoscopic, interventional radiology and open procedures can be used to evacuate the abdominal abscess. However, if surgery is required, the necrotic tissue will be removed, and all adhesions can be lysed. Most of these patients require monitoring in the intensive care unit (ICU) and need aggressive resuscitation with fluids. If the abscess is localized and promptly treated, the prognosis is good.
Abscesses located in the pelvis may be drained transrectally or transvaginally, and the results are excellent.
Open surgery for an abdominal abscess is a difficult undertaking and can be difficult because of adhesions and lack of proper anatomical pathways to separate bowel.
The prognosis of patients with an abdominal abscess prior to the era of the CT scan was very high. Today, with the availability of CT scans the diagnosis is made much earlier, and in fact in many cases, CT guided drainage has helped lower the morbidity. However, if an abdominal abscess is misdiagnosed and not treated, the mortality is very high. Risk factors that increase mortality and morbidity include the following:
An abdominal abscess can lead to the following complications:
Patients with an abdominal abscess usually require a stay in the hospital. Repeat imaging is often done to ensure that there is no more residual abscess after treatment.
Depending on the complexity of the abscess, some patients may require total parenteral nutrition.
Because the patients are often frail, physical therapy is recommended to help recover muscle strength and flexibility.
Once a diagnosis of an abdominal abscess is done, a general surgeon and a radiologist should be consulted.
Those with gross contamination of the abdominal cavity can develop multiorgan failure and consequently have a high mortality rate.
Today with the availability of CT scan, both diagnosis and drainage can be accomplished with very low morbidity.
A complex abscess may require a laparoscopic or an open approach.
An abdominal abscess is not an uncommon presentation on the general surgery ward or to the emergency department. Because of its vague clinical presentation, the disorder is best managed by an interprofessional group of health professional that includes a surgeon, dietitian, pharmacist, radiologist, gastroenterologist, and a wound care nurse. An abdominal abscess has significant morbidity and can rapidly become fatal if left untreated. To improve outcomes, communication between the interprofessional team is highly recommended.
While initial antibiotics are broad-spectrum, the pharmacist and clinicians need to watch the blood cultures to determine the type of organisms growing and their sensitivity. In many cases, patients with an abdominal abscess may not be able to eat and may require peripheral or central parenteral nutrition and hence, a dietary consult should be involved. While there are no universal guidelines on the management of an abdominal abscess, the current consensus indicates that percutaneous drainage by a radiologist has low morbidity compared to an open procedure.
All patients with an abdominal abscess need close monitoring as they can quickly become septic. The nursing responsibility lies with measuring vital signs, urine output, pressure sore prevention, DVT prophylaxis, ambulation, and timely antibiotics. Any change in the patient's clinical status should be immediately communicated to the clinician.
There should not be any delay in consulting with the surgeon, as delay can lead to adverse outcomes and significant healthcare costs. Many of these patients also develop wound infections that do not heal. Hence a consult with a wound care nurse for daily dressings is necessary.
The progress and monitoring of patients with an abdominal abscess are made by regular physical exams, vital signs, and imaging tests. Often these patients have drainage devices that also need to be monitored for the type and amount of fluid discharge. Only through a systematic clinical interprofessional team approach can the morbidity and mortality of an abdominal abscess be lowered. (Level III)
The outcomes after an abdominal abscess depend on patient morbidity, the cause, extent of contamination and age. When multiple organs are involved and the patient is septic, the outcomes are poor. However, for localized abscesses from a rupture of an appendix or sigmoid diverticulitis, the outcomes are good. Many of these patients have significant comorbidity which affects their long-term survival. The key to improving mortality is an interprofessional approach with prompt diagnosis, close monitoring, and early treatment. [Level 5}  (Level V)
|||Sarychev LP,Sarychev YV,Pustovoyt HL,Sukhomlin SA,Suprunenko SM, Management of the patients with blunt renal trauma: 20 years of clinical experience. Wiadomosci lekarskie (Warsaw, Poland : 1960). 2018 [PubMed PMID: 29783255]|
|||Son DJ,Hong JY,Kim KH,Jeong YH,Myung DS,Cho SB,Lee WS,Kang YJ,Kim JW,Joo YE, Liver abscess caused by Clostridium haemolyticum infection after transarterial chemoembolization for hepatocellular carcinoma: A case report. Medicine. 2018 May [PubMed PMID: 29742715]|
|||Serraino C,Elia C,Bracco C,Rinaldi G,Pomero F,Silvestri A,Melchio R,Fenoglio LM, Characteristics and management of pyogenic liver abscess: A European experience. Medicine. 2018 May [PubMed PMID: 29742700]|
|||Cirocchi R,Afshar S,Shaban F,Nascimbeni R,Vettoretto N,Di Saverio S,Randolph J,Zago M,Chiarugi M,Binda GA, Perforated sigmoid diverticulitis: Hartmann's procedure or resection with primary anastomosis-a systematic review and meta-analysis of randomised control trials. Techniques in coloproctology. 2018 Jul 11 [PubMed PMID: 29995173]|
|||Göbel T,Rauen-Vossloh J,Hotz HG,Boldt A,Erhardt A, [Conservative treatment of an aseptic abscess syndrome with splenic abscesses in Crohn's disease]. Zeitschrift fur Gastroenterologie. 2017 Dec [PubMed PMID: 29212102]|
|||Lentz J,Tobar MA,Canders CP, Perihepatic, Pulmonary, and Renal Abscesses Due to Spilled Gallstones. The Journal of emergency medicine. 2017 May [PubMed PMID: 28174034]|
|||Li PH,Tee YS,Fu CY,Liao CH,Wang SY,Hsu YP,Yeh CN,Wu EH, The Role of Noncontrast CT in the Evaluation of Surgical Abdomen Patients. The American surgeon. 2018 Jun 1 [PubMed PMID: 29981641]|
|||Zens TJ,Rogers AP,Riedesel EL,Leys CM,Ostlie DJ,Woods MA,Gill KG, The cost effectiveness and utility of a [PubMed PMID: 29673611]|
|||Guizzetti L,Zou G,Khanna R,Dulai PS,Sandborn WJ,Jairath V,Feagan BG, Development of Clinical Prediction Models for Surgery and Complications in Crohn's Disease. Journal of Crohn's [PubMed PMID: 29028958]|
|||Chen CY,Lin MJ,Yang WC,Chang YJ,Gao FX,Wu HP, Clinical spectrum of intra-abdominal abscesses in children admitted to the pediatric emergency department. Journal of microbiology, immunology, and infection = Wei mian yu gan ran za zhi. 2018 Aug 9 [PubMed PMID: 30150137]|
|||Bakopoulos A,Tsilimigras DI,Syriga M,Koliakos N,Ntomi V,Moris D,Bistarakis D,Schizas D, Diverticulitis of the transverse colon manifesting as colocutaneous fistula. Annals of the Royal College of Surgeons of England. 2018 Aug 16 [PubMed PMID: 30112933]|
|||Yoshioka T,Kondo Y,Fujiwara T, Successful wound treatment using negative pressure wound therapy without primary closure in a patient undergoing highly contaminated abdominal surgery. Surgical case reports. 2018 Aug 1 [PubMed PMID: 30069647]|
|||Holubar SD,Hedrick T,Gupta R,Kellum J,Hamilton M,Gan TJ,Mythen MG,Shaw AD,Miller TE, American Society for Enhanced Recovery (ASER) and Perioperative Quality Initiative (POQI) joint consensus statement on prevention of postoperative infection within an enhanced recovery pathway for elective colorectal surgery. Perioperative medicine (London, England). 2017 [PubMed PMID: 28270910]|
|||Seifarth C,Kreis ME,Gröne J, Indications and Specific Surgical Techniques in Crohn's Disease. Viszeralmedizin. 2015 Aug [PubMed PMID: 26557836]|
|||Zani A,Hall NJ,Rahman A,Morini F,Pini Prato A,Friedmacher F,Koivusalo A,van Heurn E,Pierro A, European Paediatric Surgeons' Association Survey on the Management of Pediatric Appendicitis. European journal of pediatric surgery : official journal of Austrian Association of Pediatric Surgery ... [et al] = Zeitschrift fur Kinderchirurgie. 2018 Aug 15 [PubMed PMID: 30112745]|