Rapid induction of inflammatory lipid mediators by the inflammasome in vivo

Detection of microbial products by host inflammasomes is an important mechanism of innate immune surveillance. Inflammasomes activate the caspase-1 (CASP1) protease, which processes the cytokines interleukin (IL)-1β and IL-18, and initiates a lytic host cell death called pyroptosis. To identify novel CASP1 functions in vivo, we devised a strategy for cytosolic delivery of bacterial flagellin, a specific ligand for the NAIP5 (NLR family, apoptosis inhibitory protein 5)/NLRC4 (NLR family, CARD-domain-containing 4) inflammasome. Here we show that systemic inflammasome activation by flagellin leads to a loss of vascular fluid into the intestine and peritoneal cavity, resulting in rapid (less than 30 min) death in mice. This unexpected response depends on the inflammasome components NAIP5, NLRC4 and CASP1, but is independent of the production of IL-1β or IL-18. Instead, inflammasome activation results, within minutes, in an 'eicosanoid storm'--a pathological release of signalling lipids, including prostaglandins and leukotrienes, that rapidly initiate inflammation and vascular fluid loss. Mice deficient in cyclooxygenase-1, a critical enzyme in prostaglandin biosynthesis, are resistant to these rapid pathological effects of systemic inflammasome activation by either flagellin or anthrax lethal toxin. Inflammasome-dependent biosynthesis of eicosanoids is mediated by the activation of cytosolic phospholipase A(2) in resident peritoneal macrophages, which are specifically primed for the production of eicosanoids by high expression of eicosanoid biosynthetic enzymes. Our results therefore identify eicosanoids as a previously unrecognized cell-type-specific signalling output of the inflammasome with marked physiological consequences in vivo.

Balance of inflammatory cytokines related to severity and mortality of murine sepsis

We tested the hypothesis that, during sepsis, the balance of pro- and anti-inflammatory cytokines is related to severity and survival. Cecal ligation and puncture (CLP) with a large (18-gauge)-, intermediate (21-gauge)-, or small (26-gauge)-diameter needle, or sham laparotomy, was performed on outbred CD-1 mice. Concentrations of tumor necrosis factor alpha (TNF-alpha), interleukin-6 (IL-6), and the anti-inflammatory cytokine IL-10 were measured (by enzyme-linked immunosorbent assay) in serum, peritoneal lavage fluid, and liver and lung samples at 4, 8, 24, 48, and 96 h. As the diameter of the CLP needle decreased, the mortality rate decreased (at 48 h: large, 80%; intermediate, 40%; small, 20%; P < 0.05), the TNF-alpha and IL-6 concentrations decreased, and the time-to-peak TNF-alpha expression increased. In contrast, IL-10 concentration increased compared with baseline (serum at 24 h: large, 2.3-fold +/- 1.6-fold; intermediate, 2.0-fold +/- 0.5-fold; small, 49.9-fold +/- 8.3-fold; P < 0.05). Administration of IL-10 (5 microg, intraperitoneal) prior to CLP decreased mortality (P < 0.001). Administration of polyclonal anti-IL-10 serum prior to CLP (0.5 ml intraperitoneal) had the opposite effect and increased mortality (P < 0.001) and TNF-alpha, IL-6, and TNF-alpha mRNA expression compared with controls. Thus, severe sepsis is associated with a largely unopposed inflammatory response, and a largely unopposed inflammatory response (with anti-IL-10) results in severe sepsis and death. Less severe sepsis is associated with greater anti-inflammatory mediator expression, and greater anti-inflammatory mediator expression (with IL-10) results in less severe sepsis. Thus, the balance of inflammatory mediators is related to the severity and mortality of murine sepsis.

Ultrasound in blunt abdominal and thoracic trauma

Between July 1989 and June 1991, 312 patients with blunt thoracic or abdominal injuries were examined prospectively. Sonographic examination was performed by surgeons in the emergency room using a mobile ultrasound unit. In 113 (36.2%) cases pathologic findings were demonstrated sonographically. These included 47 cases of hemothorax, 11 pericardial effusions, 52 cases of intra-abdominal fluid, 24 lesions of intra-abdominal organs, and 10 cases of retroperitoneal hematoma. Physical examination findings were positive in 96 (30.8%), negative in 63 (20.2%), and equivocal in 153 (49.0%). Two hundred thirty-nine patients had between one and eight injuries in addition to the blunt abdominal or thoracic trauma. These patients had an average Injury Severity Score (ISS) of 19.9 (range, 1 to 75). The 73 patients with isolated blunt trauma of the thorax or abdomen had an ISS of 4.9 (range, 0-25). None of the 66 patients (21.2%) with positive clinical findings and negative sonographic examination results had to be operated on later in the course of treatment, while 5 (36%) of 14 patients (4.5%) with negative physical examination findings and positive sonographic findings had to undergo surgery. The sensitivity for the demonstration of intra-abdominal fluid and organ lesions was 98.1% and 41.4%, respectively. The overall sensitivity and specificity of the ultrasonic examination were 90.0% and 99.5%, respectively.

Intraoperative lavage for cytological examination in 1,297 patients with gastric carcinoma

BACKGROUND

This study examined the clinical value of intraoperative peritoneal lavage for cytological examination in patients with gastric cancer. Peritoneal dissemination is the most frequent mode of recurrence for this tumor.

METHODS

A retrospective of lavage findings, other factors, and outcome was performed in 1,297 patients with gastric cancer who underwent intraoperative peritoneal lavage.

RESULTS

The 5-year survival rate of patients with positive lavage cytology was only 2%. Patients who underwent curative resection and had negative cytology had a significantly better 5-year survival rate (P < 0.001). Even among patients with macroscopic peritoneal dissemination, the survival rate was significantly better with negative cytology, which reflected fewer free cancer cells in the peritoneal cavity. Serum concentrations of carcinoembryonic antigen and carbohydrate antigen 19-9 were significantly higher in patients with positive cytology. Multivariate analyses indicated that intraoperative cytological findings was an independent prognostic factor for survival, and was the most important factor for predicting peritoneal recurrence.

CONCLUSIONS

Intraoperative peritoneal lavage cytology is important in predicting survival and peritoneal recurrence in gastric cancer.

Hemorrhage associated with pelvic fractures: causes, diagnosis, and emergent management

The high risk of exsanguinating hemorrhage in patients with pelvic ring disruption demands aggressive, yet balanced orthopedic and angiographic management as soon as patients are admitted to the emergency department. We present a perspective of our experience in two trauma centers and propose a logical approach to early prediction, diagnosis, and management of hemorrhage associated with pelvic fractures. Our method is based on knowledge of pelvic anatomy and an understanding of the mechanisms of injury and their wounding capacity, given that the mechanism of injury determines the type of pelvic ring disruption and that the probability of arterial hemorrhage is--to a great extent--a function of the type of pelvic fracture. The risks of diagnostic peritoneal lavage and of excessive radiologic studies of noncritical injuries are emphasized. The principles guiding arterial embolization and the application of external fixators are discussed.

Analysis of prognostic factors in seventy patients having a complete cytoreduction plus perioperative intraperitoneal chemotherapy for carcinomatosis from colorectal cancer

BACKGROUND

Although lymph node and liver metastases are recognized as indications for resection of metastatic disease from colorectal cancer, carcinomatosis has not traditionally been regarded as having surgical treatment options. Reports have suggested that complete surgical removal of carcinomatosis combined with thorough irrigation of the peritoneal cavity with chemotherapy could result in longterm survival in selected patients. Proper selection factors are important because palliative surgery in these patients has not proved beneficial.

STUDY DESIGN

From a database of 156 patients with carcinomatosis from colorectal cancer, a retrospective analysis of data prospectively recorded in 70 patients with complete cytoreduction was performed. Eleven clinical and treatment factors were studied in univariate and multivariable analyses using survival as an end point.

RESULTS

By univariate analysis, patients with peritoneal cancer index (PCI) of<20 had a median survival of 41 months compared with 16 months for patients with PCI>20 (p=0.004). The difference in negative versus positive lymph nodes was also significant; differences in survival that were improved but not significant were present for age greater than 30 years, mucinous histology, location within the colon versus rectum, and absence of an adverse factor such as cancer perforation or obstruction present at the time of primary cancer resection. Only PCI<20 versus PCI>20 and lymph node status were significant in the multivariable analysis.

CONCLUSIONS

Favorable longterm results of complete cytoreduction in patients treated for carcinomatosis are associated with a limited volume of carcinomatosis observed at the time of cytoreduction and in patients with negative lymph nodes at the time of primary operation.

Sonography in blunt abdominal trauma: a preliminary progress report

Evaluation of blunt abdominal trauma is clinically challenging. Diagnostic peritoneal lavage (DPL) and computed tomographic (CT) scanning have become primary diagnostic modalities. We examined the efficacy and role of ultrasonographic (US) studies in the initial abdominal evaluation of blunt trauma patients. Over an 8-month period, patients whose abdominal work-up indicated the need for DPL or CT were evaluated sonographically within the first hour after admission by trauma fellows (PGY-6) with at least 1 hour of theoretical training and 1 hour of practical training. Sonograms considered positive were those showing free peritoneal fluid or organ disruption. Hard copies of the sonograms were evaluated by a staff radiologist without knowledge of the fellows' interpretations or of DPL or CT results. Based on the fellows' interpretation of the real-time sonograms, among the first 163 patients studied were 11 true-positive, 146 true-negative, one false-positive, and five false-negative results. Sixteen patients had intra-abdominal injury documented by DPL, CT, or laparotomy. Ultrasonography was 91% sensitive in detecting the presence of hemoperitoneum. Overall, ultrasonography was 69% sensitive, 99% specific, and 96% accurate in diagnosing abdominal injury. We conclude that emergency sonography on admission can serve as a valuable adjunct to the physical diagnosis of clinically significant hemoperitoneum. It is noninvasive, portable, and accurate in determining the need for further diagnostic/surgical intervention.

Nonoperative salvage of computed tomography-diagnosed splenic injuries: utilization of angiography for triage and embolization for hemostasis

OBJECTIVES

The aims of this study were to determine if angiographic findings can be used to predict successful nonoperative therapy of splenic injury and to determine if coil embolization of the proximal splenic artery provides effective hemostasis.

METHODS

Splenic injuries detected by diagnostic imaging between 1981 and 1993 at a level I trauma center were prospectively collected and retrospectively reviewed after management by protocol that used diagnostic peritoneal lavage, computed tomography (CT), angiography, transcatheter embolization, and laparotomy. Computed tomography was performed initially or after positive diagnostic peritoneal lavage. Angiography was performed urgently in stabilized patients with CT-diagnosed splenic injuries. Patients without angiographic extravasation were treated by bed rest alone; those with angiographic extravasation underwent coil embolization of the proximal splenic artery followed by bed rest.

RESULTS

Patients (172) with blunt splenic injury are the subject of this study. Twenty-two patients were initially managed operatively because of associated injuries or disease (11 patients) or because the surgeon was unwilling to attempt nonoperative therapy (11 patients) and underwent splenectomy (17 patients) or splenorrhaphy (5 patients). One hundred fifty of 172 consecutive patients (87%) with CT-diagnosed splenic injury were stable enough to be considered for nonoperative management. Eighty-seven of the 90 patients managed by bed rest alone, and 56 of 60 patients treated by splenic artery occlusion and bed rest had a successful outcome. Overall splenic salvage was 88%. It was 97% among those managed nonoperatively, including 61 grade III and grade IV splenic injuries. Sixty percent of patients received no blood transfusions. Three of 150 patients treated nonoperatively underwent delayed splenectomy for infarction (one patient) or splenic infection (two patients).

CONCLUSIONS

(1) Hemodynamically stable patients with splenic injuries of all grades and no other indications for laparotomy can often be managed nonoperatively, especially when the injury is further characterized by arteriography. (2) The absence of contrast extravasation on splenic arteriography seems to be a reliable predictor of successful nonoperative management. We suggest its use to triage CT-diagnosed splenic injuries to bed rest or intervention. (3) Coil embolization of the proximal splenic artery is an effective method of hemostasis in stabilized patients with splenic injury. It expands the number of patients who can be managed nonoperatively.

Blunt abdominal trauma in cases of multiple trauma evaluated by ultrasonography: a prospective analysis of 291 patients

Early recognition of blunt abdominal trauma in patients with multiple injuries and in shock is of utmost importance and calls for a rapid screening method. The reliability of diagnostic ultrasonography in detecting hemoperitoneum in patients with multiple trauma was evaluated prospectively. From 1986 to 1990, 291 patients with severe multiple injuries (ISS greater than 20, mean ISS 31.2) were included in the study. Laparotomy was performed on 117 patients (40%). Initial ultrasound (US) findings showed a sensitivity, specificity, and accuracy of 89%, 97%, and 94%, respectively, in detecting intra-abdominal injuries requiring surgical repair. The positive and negative predictive values were 94% and 95%, respectively. A standardized management of frequent repeat US studies can even improve on these numbers. In our department ultrasonography has replaced diagnostic peritoneal lavage (DPL) as the diagnostic study of first choice. Diagnostic peritoneal lavage is reserved for selected cases only.

Prospective comparison of diagnostic peritoneal lavage, computed tomographic scanning, and ultrasonography for the diagnosis of blunt abdominal trauma

From January through December 1990, a prospective study comparing the accuracy of diagnostic peritoneal lavage (DPL), abdominal computed tomographic (CT) scanning, and abdominal ultrasonographic (US) scanning was carried out. Patients with stable vital signs following their initial resuscitation coupled with equivocal physical examination findings received both CT and US scanning. A DPL was then done. If any of these three examinations produced positive findings, a laparotomy was done and the surgical findings were compared with the results of the diagnostic studies. Fifty-five patients were studied (44 men, 11 women), with a mean age of 43 years and a mean ISS of 18.5 +/- 10.5. The sensitivity, specificity, and accuracy were 100%, 84.2%, and 94.5% for DPL, 97.2%, 94.7%, and 96.4% for CT scanning, and 91.7%, 94.7%, and 92.7% for US scanning. Problems do exist in identifying isolated small intestinal perforations with ultrasonography. Since more and more trauma centers are using ultrasonography in the emergency department as a screening method in the management of patients with blunt abdominal trauma, it is important to avoid overestimating its capability. Frequent re-evaluation of the patient's condition, repeat ultrasonographic scans, diagnostic peritoneal lavage, and CT scanning are complementary and important in the diagnosis of blunt abdominal trauma.

Extensive intraoperative peritoneal lavage as a standard prophylactic strategy for peritoneal recurrence in patients with gastric carcinoma

OBJECTIVE

This prospective randomized multicenter study aims to evaluate the efficacy of extensive intraoperative peritoneal lavage followed by intraperitoneal chemotherapy (EIPL-IPC) on the overall 5-year survival of advanced gastric cancer patients with intraperitoneal free cancer cells without overt peritoneal metastasis (CY+/P-). The study also aims to determine the merit and reliability of EIPL-IPC therapy as a prophylactic strategy for peritoneal metastasis.

SUMMARY BACKGROUND DATA

Although the prognosis of advanced gastric cancer patients with CY+/P- is extremely poor, a suitable standard regimen for treating such patients has not yet been established.

METHODS

A total of 88 patients with CY+/P- from 1522 patients with advanced gastric cancer at multicenters were enrolled in this study and were randomly allocated to 3 groups: surgery alone group, surgery plus intraperitoneal chemotherapy (IPC) group, and surgery plus EIPL and IPC (EIPL-IPC) group. Prognostic significance of EIPL-IPC therapy was evaluated by Kaplan-Meier curves, and its value as an independent prognostic factor was assessed by univariate and multivariate analyses.

RESULTS

The overall 5-year survival rate of the patients with EIPL-IPC was 43.8%, and this data were significantly better than that of the IPC group (4.6%, P < 0.0001) and the surgery alone group (0%, P < 0.0001). Among various recurrent patterns, the EIPL-IPC group had a significantly lower incidence of peritoneal recurrence than both of the other groups (P < 0.0001). Univariate and multivariate analyses revealed that EIPL was the most significant impact factor.

CONCLUSIONS

The present study clearly revealed that EIPL-IPC therapy significantly improved the 5-year survival span of advanced gastric cancer patients with CY+/P-. Thus, EIPL-IPC therapy is strongly recommended as a standard prophylactic strategy for peritoneal dissemination.

Analysis of morbidity and mortality in 60 patients with peritoneal carcinomatosis treated by cytoreductive surgery and heated intraoperative intraperitoneal chemotherapy

BACKGROUND

Peritoneal carcinoma has been regarded as a uniformly lethal clinical entity. A treatment plan combining cytoreductive surgery and heated intraoperative intraperitoneal chemotherapy (HIIC) was devised and tested to treat such patients. The purpose of this study was to evaluate the morbidity and mortality associated with this treatment approach.

METHODS

Sixty patients with peritoneal carcinomatosis from adenocarcinoma of the colon or appendix were included in the study. Extensive cytoreductive surgery was combined with heated intraperitoneal mitomycin in an intraoperative lavage technique followed by one cycle of early postoperative intraperitoneal 5-fluorouracil. Eleven clinical variables were selected and statistically correlated with morbidity and mortality.

RESULTS

Twenty-five complications occurred in 21 patients (morbidity = 35%). Morbidity related to gastrointestinal function included anastomotic leak (n=6), bowel perforations (n=5), bile leak (n=3), and pancreatitis (n=2). Four patients presented with severe hematologic toxicity (Grade 3 or 4). There were three cases of postoperative bleeding, one case of abdominal wound dehiscence, and one case of pulmonary embolism. Morbidity was significantly associated with three clinical factors: male sex, high intraabdominal temperature during HIIC, and duration of the surgical procedure. Enteral complications (bowel fistula and anastomotic leak) occurred in patients with a significantly higher number of peritonectomy procedures and a significantly longer operation. Three patients died within 8 weeks after the procedure (mortality = 5%). Mortality was significantly associated with age and intraabdominal temperature.

CONCLUSIONS

Cytoreductive surgery combined with HIIC is associated with a 35% morbidity rate and a 5% mortality rate. Extensive surgery (duration and number of peritonectomy procedures) and high intraabdominal temperature represent the major risk factors for postoperative morbidity and mortality of patients treated with this new therapeutic approach.

Prognostic significance of serosal invasion and free intraperitoneal cancer cells in gastric cancer

Survival rates after curative gastrectomy for advanced gastric cancer among 238 patients in whom the cancer was invading the serosa were compared with 283 patients without serosal invasion. Generalized Wilcoxon estimates for 5-year survival rate were 47.1 per cent for patients exhibiting serosal invasion and 75.9 per cent for patients without serosal invasion. The frequency of lymph node metastasis increased proportionately with the extent of serosal invasion: 18.4 per cent in cases of S0; 53.8 per cent in cases of S1; 80.0 per cent in cases of S2; and 91.4 per cent in cases of S3. The higher the aggregate total of S (serosal invasion) and n (lymph node metastasis) factors, the lower the 5-year survival rate. In addition, patients with serosal invasion had a propensity for peritoneal dissemination of cancer cells; the percentage of cases with intraperitoneal free cancer cells increased with the extent of serosal invasion. It is worth noting that when cancer infiltration proceeded to the deeper layers and was accompanied by nodal metastasis, cancerous invasion of the perinodal fatty tissue was frequently evident. Therefore, unfavourable prognosis after curative resection in gastric cancer patients with serosal invasion may be largely dependent on whether or not the cancer has invaded the peritoneal cavity and the perinodal fatty tissue.

1,000 consecutive ultrasounds for blunt abdominal trauma

Diagnostic peritoneal lavage (DPL) and computed tomography (CT) are the primary diagnostic modalities used in the evaluation of patients with suspected blunt abdominal trauma (BAT). DPL is fast and accurate but is associated with complications. CT is also accurate, yet requires stability and transportability of the patients. Ultrasound (US) has been suggested as an aid in evaluating BAT. We evaluated US in the initial assessment of BAT in 1000 patients. Patients were eligible for the study if they met specified trauma criteria and had suspected BAT. We then followed the outcome of the patients and their further work-up. US showed a sensitivity of 88%, a specificity of 99%, and an accuracy of 97% for detecting intraabdominal injuries. We conclude that emergency ultrasound may be used as the initial diagnostic modality for suspected blunt abdominal trauma.

Laparoscopic peritoneal lavage or sigmoidectomy for perforated diverticulitis with purulent peritonitis: a multicentre, parallel-group, randomised, open-label trial

BACKGROUND

Case series suggest that laparoscopic peritoneal lavage might be a promising alternative to sigmoidectomy in patients with perforated diverticulitis. We aimed to assess the superiority of laparoscopic lavage compared with sigmoidectomy in patients with purulent perforated diverticulitis, with respect to overall long-term morbidity and mortality.

METHODS

We did a multicentre, parallel-group, randomised, open-label trial in 34 teaching hospitals and eight academic hospitals in Belgium, Italy, and the Netherlands (the Ladies trial). The Ladies trial is split into two groups: the LOLA group comparing laparoscopic lavage with sigmoidectomy and the DIVA group comparing Hartmann's procedure with sigmoidectomy plus primary anastomosis. The DIVA section of this trial is still underway but here we report the results of the LOLA section. Patients with purulent perforated diverticulitis were enrolled for LOLA, excluding patients with faecal peritonitis, aged older than 85 years, with high-dose steroid use (≥20 mg daily), and haemodynamic instability. Patients were randomly assigned (2:1:1; stratified by age [<60 years vs ≥60 years]) using secure online computer randomisation to laparoscopic lavage, Hartmann's procedure, or primary anastomosis in a parallel design after diagnostic laparoscopy. Patients were analysed according to a modified intention-to-treat principle and were followed up after the index operation at least once in the outpatient setting and after sigmoidoscopy and stoma reversal, according to local protocols. The primary endpoint was a composite endpoint of major morbidity and mortality within 12 months. This trial is registered with ClinicalTrials.gov, number NCT01317485.

FINDINGS

Between July 1, 2010, and Feb 22, 2013, 90 patients were randomly assigned in the LOLA section of the Ladies trial when the study was terminated by the data and safety monitoring board because of an increased event rate in the lavage group. Two patients were excluded for protocol violations. The primary endpoint occurred in 30 (67%) of 45 patients in the lavage group and 25 (60%) of 42 patients in the sigmoidectomy group (odds ratio 1·28, 95% CI 0·54-3·03, p=0·58). By 12 months, four patients had died after lavage and six patients had died after sigmoidectomy (p=0·43).

INTERPRETATION

Laparoscopic lavage is not superior to sigmoidectomy for the treatment of purulent perforated diverticulitis.

FUNDING

Netherlands Organisation for Health Research and Development.

Focused abdominal sonogram for trauma: the learning curve of nonradiologist clinicians in detecting hemoperitoneum

BACKGROUND

The focused abdominal sonogram for trauma (FAST) has been used by surgeons and emergency physicians (CLIN) to screen reliably for hemoperitoneum after trauma. Despite recommendations for "appropriate training," ranging from 50 to 400 proctored examinations, there are no supporting data.

METHODS

We prospectively examined the initial FAST experience of CLIN in detecting hemoperitoneum by using diagnostic peritoneal lavage, computed tomography, and clinical findings as the diagnostic "gold standard."

RESULTS

241 patients had FAST performed by 12 CLIN (average, 20/CLIN; range, 2-43); 51 patients (21.2%) had hemoperitoneum and 17 patients (7.1%) required laparotomy. Initial experience with FAST by CLIN produced 35 true positives, 180 true negatives, 16 false negatives, and 3 false positives; sensitivity, 68%; specificity, 98%. Initial error rate was 17%, which fell to 5% after 10 examinations (chi2; p < 0.05).

CONCLUSION

Previous recommendations for the number of proctored examinations for individual nonradiologist clinician sonographers to develop competence are excessive.

Clinical problem of intraperitoneal postsurgical adhesion formation following general surgery and the use of adhesion prevention barriers

Because of multiple studies demonstrating barrier efficacy, adhesion prevention adjuvants have received widespread acceptance in appropriate surgical settings. Many investigators are incorporating adhesion prevention barriers into their routine clinical practice and are achieving good results. Although both Seprafilm and Interceed barriers were shown to be safe and effective in all human clinical trials, their use did not eliminate adhesions in all patients. Efficacy of these barriers is limited to surgical situations in which the area in question can be completely covered. Physician acceptance is constrained by technical difficulties, including the need for hemostasis and removal of excess peritoneal fluid (Interceed), as well as limitations in application and handling properties within the surgical field (Seprafilm).

Quantitative sensitivity of ultrasound in detecting free intraperitoneal fluid

The minimum volume of intraperitoneal fluid that is detectable in Morison's pouch with ultrasound in the trauma setting is not well defined. To evaluate this question, we used diagnostic peritoneal lavage (DPL) as a model for intraperitoneal hemorrhage and undertook a blinded prospective study of the sensitivity of ultrasound in detecting intraperitoneal fluid. Participants included attending physicians and residents in emergency medicine, radiology, and surgery. During the infusion of the DPL fluid, participants continuously scanned Morison's pouch until they detected fluid. All participants were blinded to the rate of infusion and the volume infused. One hundred patients were entered into the study. The mean volume of fluid detected was 619 mL. Only 10% of participants detected fluid volumes less than 400 mL and the overall sensitivity at one liter was 97%. We conclude that reliable detection of intraperitoneal fluid in Morison's pouch requires a greater volume than has been previously described.

Can ultrasound replace diagnostic peritoneal lavage in the assessment of blunt trauma?

Diagnostic peritoneal lavage (DPL) and computed tomography (CT) are the primary diagnostic modalities in the evaluation of patients with suspected blunt abdominal trauma (BAT). Diagnostic peritoneal lavage is fast and accurate but associated with complications. Computed tomography is also accurate, yet requires that patients be stable and transportable. A prospective study was designed to determine the utility of emergency ultrasound (US) studies in the initial assessment of BAT. Two hundred acutely injured patients with suspected BAT were evaluated with US. Patients were eligible for the study if they met trauma criteria and had suspected BAT. Subsequently, without knowledge of the US results, DPL or CT was performed. Ultrasound showed a sensitivity of 83%, a specificity of 100%, and an accuracy of 97% in detecting intra-abdominal injuries. Six injuries were missed but only one was felt to be significant. If US had been used in all 200 patients, 199 would have had appropriate care. We conclude US is reliable in the detection of free intraperitoneal fluid and may be used in place of DPL or CT.

Laparoscopic management of generalized peritonitis due to perforated colonic diverticula

PURPOSE

The use of laparoscopic peritoneal lavage in conjunction with parenteral fluids and antibiotic therapy in the management of generalized peritonitis secondary to perforated diverticular disease of the colon was assessed.

PATIENTS AND METHODS

This cohort comprised 8 patients with generalized peritonitis secondary to perforated diverticular disease of the left colon that was diagnosed laparoscopically. All the patients had purulent peritonitis, but no fecal contamination. They were treated with laparoscopic peritoneal lavage and intravenous fluids and antibiotics.

RESULTS

All patients made a complete recovery, with resumption of normal diet within 5 to 8 days. No patient has required surgical intervention during a 12- to 48-month follow-up. This approach merits further assessment as an alternative to the traditional open surgical management.

Regulation of neutrophil extracellular trap formation by anti-inflammatory drugs

The formation of neutrophil extracellular traps (NETs) is a newly described phenomenon that increases the bacteria-killing ability and the inflammatory response of neutrophils. Because NET generation occurs in an inflammatory microenvironment, we examined its regulation by anti-inflammatory drugs. Treatment of neutrophils with dexamethasone had no effect, but acetylsalicylic acid (ASA) treatment prevented NET formation. NETosis was also abrogated by the presence of BAY 11-7082 [(E)-3-[4-methylphenylsulfonyl]-2-propenenitrile] and Ro 106-9920 [6-(phenylsulfinyl)tetrazolo[1,5-b]pyridazine], two structurally unrelated nuclear factor-κB (NF-κB) inhibitors. The decrease in NET formation mediated by ASA, BAY-11-7082, and Ro 106-9920 was correlated with a significant reduction in the phosphorylation of NF-κB p65 subunit, indicating that the activation of this transcription factor is a relevant signaling pathway involved in the generation of DNA traps. The inhibitory effect of these drugs was also observed when NET generation was induced under acidic or hyperthermic conditions, two stress signals of the inflammatory microenvironment. In a mouse peritonitis model, while pretreatment of animals with ASA or BAY 11-7082 resulted in a marked suppression of NET formation along with increased bacteremia, dexamethasone had no effect. Our results show that NETs have an important role in the local control of infection and that ASA and NF-κB blockade could be useful therapies to avoid undesired effect of persistent neutrophil activation.

Primary vs. secondary anastomosis after sigmoid colon resection for perforated diverticulitis (Hinchey Stage III and IV): a prospective outcome and cost analysis

PURPOSE

Our hypothesis was that in patients with perforated sigmoid colon diverticulitis and peritonitis (Hinchey Stage III and IV) a one-stage sigmoid colon resection is safe and cost effective when performed by an experienced colorectal surgeon. We evaluated outcome and cost of one-stage vs. two-stage sigmoid colon resection after diverticulitis perforation and peritonitis.

METHODS

Patients undergoing emergency resection for perforated sigmoid colon diverticulitis and peritonitis (Hinchey Stage III and IV). Outcome, costs, and insurers reimbursement were compared between 13 patients undergoing sigmoid colon resection and primary anastomosis (Group A) and 42 patients undergoing sigmoid colon resection with Hartmann's procedure and secondary descendorectostomy (Group B).

RESULTS

Group A patients were comparable to Group B patients in age, gender, preoperative risk and severity of peritonitis (Mannheim Peritonitis Index and C-reactive protein). Operating room time for sigmoid colon resection with primary anastomosis (3.3 +/- 1.2 hours) was identical to the time for sigmoid colon resection with colostomy (3.3 +/- 1 hour), and morbidity and mortality, intensive care unit, and in-hospital stay were not significantly different between the two groups. In Group B patients' intestinal continuity was restored 169 +/- 74 days after the primary resection in 32 of 42 patients only (78 percent). The second procedure took on average 1.4 hours longer than the first procedure. Patients in Group B received more antibiotics (2.2 vs. 2) albeit for a shorter period of time (4.5 vs. 5.7 days, P = not significant). Overall expenses for restoration of intestinal continuity were between 74 and 229 percent higher for Group B patients than for Group A patients. Reimbursement was 18,191 +/- 16,761 SFr (Group A) and 41,321 +/- 26,983 SFr (Group B) respectively.

CONCLUSION

With meticulous surgical technique and extensive intraoperative lavage, perforated sigmoid colon diverticulitis with peritonitis can be treated by a one-stage sigmoid colon resection and anastomosis with a low mortality and morbidity. A one-stage procedure is considerably cheaper and patients are rehabilitated faster and to a higher percentage.

Etappenlavage: advanced diffuse peritonitis managed by planned multiple laparotomies utilizing zippers, slide fastener, and Velcro analogue for temporary abdominal closure

Etappenlavage is defined as a series of planned multiple operative procedures performed at a 24-hour interval. It includes a commitment to reexplore the patient's abdomen at the initial corrective operation. This is a report of a prospective study of 117 patients treated by etappenlavage for severe advanced suppurative peritonitis in 2 institutions. Etappenlavage was performed in 15% of all patients with operations for peritonitis. In these patients, the abdominal infection had progressed to an advanced stage of severe functional impairment. A total of 669 laparotomies were performed and the abdomen closed temporarily utilizing retention sutures (n = 45), a simple zipper (n = 26), a slide fastener (n = 29), and Velcro analogue (n = 17). An average of 6.1 procedures were necessary to control the infection. In 57% of the patients, additional complications were recognized and repaired after the initial operation. Patients were artificially ventilated for an average of 17 days. The median duration of therapy was 33 (range, 3-183) days. Twenty-eight patients died between days 3 and 71 (median, 9) after initiation of therapy. In 88%, uncomplicated wound healing was observed after wounds were closed definitely. In the last 17 patients, no complications were attributable to the use of 2 adhesive sheets of polyamide plus nylon or perlon for temporary abdomimal closure (Velcro-like artificial burr). APACHE II scoring predicted a median mortality of 47%. The actual mortality was 25%. Overall, the mortality of advanced diffuse peritonitis was reduced from a predicted 34-93% (APACHE II/SIS scoring) to 24%. Velcro analogue (artificial burr) was the most practical device for temporary abdominal closure.

A comparison of right and left blunt traumatic diaphragmatic rupture

Since right blunt traumatic diaphragmatic rupture (BTDR) is reported with increasing frequency, BTDR may be a disease in evolution. Data were collected on 59 left, 16 right, and five bilateral BTDRs at a level 1 trauma center. Patients with right BTDR had lower Glasgow Coma Scale (GCS) scores (p < 0.05), were more likely to be initially in hypovolemic shock, and were admitted directly from the field (p < 0.01). Left and right BTDRs were diagnosed from chest films in 37% and 0% of cases, respectively (p < 0.05). Diagnostic peritoneal lavage results were negative in 16% of left and left of 0% of right BTDRs. For right BTDRs, the liver was more likely to be injured (p < 0.001). The mortality rates were similar and ICU and hospital stays, complications, and duration of mechanical ventilation were similar for early survivors with right and left BTDRs. The clinical signs and symptoms, diagnosis, and surgical findings associated with right and left BTDR are different.

Peritoneal washing cytology: prognostic value of positive findings in patients with gastric carcinoma undergoing a potentially curative resection

BACKGROUND AND OBJECTIVES

Free cancer cells in the abdominal cavity exfoliated from a tumor are considered to be responsible for peritoneal dissemination, the most frequent pattern of failure in gastric carcinoma patients treated with curative surgery.

METHODS

A prospective survival analysis was performed with 91 gastric carcinoma patients treated by potentially curative resection. Cytology was performed for all the patients. The method of Kaplan and Meier was used to construct curves with diagnosis of peritoneal dissemination and cancer death as the end points. Multivariate analysis by Cox's proportional hazards model was performed to identify independent prognostic factors of significance.

RESULTS

Patients with a positive cytology result were confirmed to have a greater risk for recurrence in the pattern of peritoneal carcinomatosis and hence a significantly inferior prognosis. Positive cytology was the only significant independent prognostic factor among the curatively resected patients with advanced gastric carcinoma.

CONCLUSIONS

Peritoneal lavage cytology should be employed for all advanced cancer undergoing potentially curative resection for added accuracy in the stage classification. The results should also reflect the eligibility of the patients for future clinical trials involving perioperative intraperitoneal chemotherapy.