Intussusception in the 1990s: has 25 years made a difference?

To evaluate the current management of the infant and child with intussusception, the medical records of 188 consecutive intussusception patients over 5 years (1985-1990) were reviewed and compared to our series from 25 years ago (1959-1968). The peak months changed from May and June to January and July. Duration of symptoms and signs prior to diagnosis increased by one-third to 35 h with, however, a decrease in the incidence of pain, vomiting, abdominal mass, and rectal blood. Air was the only contrast used for the hydrostatic enema in the present series and was tried in every case with 81% success; this is a major improvement from 45% in the old series. There were three perforations (1.4%) with air-enema attempts compared with 1 (0.2%) 25 years ago. Recently only 19% of patients required operation but 30% needed resection; 55% of the patients in the older series required operation and 20% needed resection. Ten percent of intussusceptions continue to be found spontaneously reduced at operation. There were many less pathologic lead points in the newer series. The recurrences increased from 4% to 7%, but their reduction rate also increased from 31% with barium to 100% with air. There were no deaths in the last 25 years.

Intussusception: toward less surgery?

Since the 1950s, several large pediatric centers have used hydrostatic reduction with barium under fluoroscopic control as the treatment method of choice for ileocolic intussusception and have adopted rigid criteria for its management. One such rule has been that in order for an intussusception to be completely reduced, there must be adequate reflux of barium into the distal ileum. If this did not occur, it was assumed that the ileocolic intussusception had not been reduced, and the infant or child was taken straight to the operating room for laparotomy and surgical treatment. However, 10% of such intussusceptions were found to have reduced spontaneously. Needless to say, nonoperative management reduces morbidity and shortens hospitalization. From October 1985 through March 1991, 503 air contrast colon studies for suspected intussusception were performed on infants and children aged 2 days to 13 years (average, 16.8 months); 262 (52%) were normal, and 241 had an intussusception, 196 (81%) of which were reduced. The remaining 45 were operated on. In three patients (4 months to 2 years of age) the air enema reduced the intussusception from the colon without terminal ileum filling, but they all became asymptomatic immediately. For this reason they were not operated on; they were admitted and observed for 24 to 48 hours. Two of the three had recurrence of abdominal pain the next morning, but results of repeat air enemas were all normal (no intussusception observed, and normal terminal ileum filling).(ABSTRACT TRUNCATED AT 250 WORDS)

CT of blunt chest trauma in children.

While trauma is still the leading cause of death in the pediatric age range, it is surprising how little the CT appearances of pediatric chest injury have been investigated in the literature. We have reviewed the CT findings of blunt chest trauma in 44 children for whom chest CT examinations were requested to investigate the extent of intrathoracic injury. We noted a propensity for pulmonary contusions to be located posteriorly or posteromedially, and for them to be anatomically nonsegmental and crescentic in shape. This is possibly attributable to the relatively compliant anterior chest wall in children. The CT appearances of other major thoracic injuries are described, including pulmonary lacerations, pneumothoraces, malpositioned chest tubes, mediastinal hematomas, aortic injury, tracheobronchial injury, hemopericardium, and spinal injuries with paraspinal fluid collections. Children demonstrating findings incidental to the actual injury yet important to the subsequent therapy are also presented. We conclude that, in the event of clinically significant blunt chest trauma, the single supine chest examination in the trauma room is insufficient to adequately identify the extent of intrathoracic injury. With the exception of concern for aortic injury for which aortography is indicated, a dynamically enhanced CT scan of the thorax should be performed as clinically significant findings may result in altered therapy.

Clinical factors affecting mortality in children with malrotation of the intestine.

In children with symptoms secondary to malrotation of the intestine, a retrospective statistical study was undertaken to identify factors associated with an increased risk of mortality. Between 1964 and 1989, laparatomy was performed on 182 children. For study purposes, the children were divided into three groups. Group I included 71 patients with an obstruction only in the duodenum. The remaining 111 children, all of whom had midgut volvulus, were further divided; those without gut necrosis (79) into group II, and those with necrosis (32) into group III. One child each died in groups I and II, and 15 in group III. In all children we evaluated the relationship between mortality and age at presentation, presence of associated serious abnormalities, time from onset of symptoms to surgery, and the presence of necrotic bowel. For group III, we considered the influence of percentage of bowel resected on mortality. In these 182 children the factors associated with an increased risk of mortality were presence of necrosis (P < .0001), presence of other abnormalities (P = .0008), and younger age (P = .0084). Time from onset of symptoms to surgery was not associated with statistically increased risk of mortality. The 1% mortality noted in children without intestinal necrosis (group I and II) was related to associated abnormality. For group III the estimated probability of survival ranged from .999 for patients with 10% of intestinal necrosis to .351 for whose with 75% of intestinal necrosis, assuming the best prognostic conditions (patient older than 3 months with no associated serious abnormalities).

Rupture of the thoracic trachea following blunt trauma: diagnosis by CAT scan.

A case of isolated rupture of the thoracic trachea due to blunt trauma in a 4-year-old child is presented. The rarity of this injury and its initial presentation as massive subcutaneous emphysema and bilateral pneumothoraces warrant its description. This child was diagnosed as having a tracheal injury by computed tomography scan. The diagnosis was confirmed at bronchoscopy and was successfully treated by thoracotomy and primary closure of a 3-cm rent in the membranous portion of the trachea. There was difficulty with intraoperative ventilation due to the large air leak through the tracheal tear. This was controlled by intermittent tamponade of the defect with sequential closure. Postoperatively, the child did well and was discharged on the sixth postoperative day. Rigid bronchoscopy done 2 months later showed no abnormality. This case demonstrates that computed tomography is helpful in the diagnosis of tracheal injuries. The treatment may require early operative intervention and closure of the defect.

Perianal complications of pediatric Crohn's disease.

The management of perianal disease (PD) in children with Crohn's disease was reviewed. Of 325 patients (184 boys), 200 (62%) developed PD. The mean age at diagnosis of Crohn's disease was 11.2 years (range, 5 to 17 years). Skin tags were present in 114 (35%) patients, fissures in 165 (51%), fistulas in 41 (15%), and perirectal abscesses in 47 (13%). One hundred fifty-three patients had PD as one of the first symptoms; 71 of these had complete remission of PD and the remaining 82 had chronic symptoms. Forty-two patients were initially free of PD, only to develop it later. PD occurred in 50% of patients with gastroduodenal Crohn's disease, 57% with jejunal, 68% with ileal, 64% with ileocecal, 60% with ileocolic, and 51% with colonic. Local minor operation was necessary in 38 (12%) patients, fistulotomy in 12, and abscess drainage in 26. Four patients required either intestinal resection and/or enterostomy for progressive PD. Fifty-three patients received metronidazole, with amelioration in 38. It is concluded that PD is a common complication of Crohn's disease in children and adolescents. Its presentation may antedate that of the primary disease. Most PD follows a benign course. There is a limited role for operation, but a need for meticulous perineal care and a potential benefit with metronidazole therapy. We advocate conservatism in the management of perianal complications of Crohn's disease in pediatric patients.

Intussusception: barium or air?

At The Hospital For Sick Children, the use of air has recently replaced the use of barium in the reduction of intussusceptions. The purpose of this study was to review the results from 200 consecutive patients with intussusceptions, 100 patients treated with barium enema and 100 patients treated with air enema. The groups were similar with regard to sex, average and median ages, and presenting symptoms and signs. Successful reduction was achieved in 75% of episodes of intussusception treated with barium enema and 76% treated with air enema. Failure of either modality showed a high association with the presence of either a lead point or an ileoileal or ileoileocolic intussusception. Among those cases of unsuccessful reduction, operation was performed in all 59 cases; resection in 30 cases, manual reduction in 19, and spontaneous reduction was found in 10. There were three perforations during attempted reduction with barium and two with air. All perforations were treated by resection and primary anastomosis. There were 18 recurrent intussusceptions following barium enema reduction and nine following air enema reduction. Therefore, with the lower absorption of x-rays by air and the relatively inert nature of air (compared with barium in the event of a perforation), we feel that air enema is the treatment of choice in the initial management of intussusception.

ECMO without heparin: laboratory and clinical experience.

To evaluate the feasibility of long-term extracorporeal membrane oxygenation (ECMO) without heparin, we placed six lambs on standard venoarterial ECMO for 71 to 96 hours. Group 1 (3 animals) was given doses of heparin to maintain activated clotting times (ACT) greater than 400 seconds. No form of anticoagulant was used for the three animals in group 2. Blood flow was maintained at 60 mL/kg/min. No histological evidence of thrombosis was noted at necropsy. ACT, prothrombin time, and partial thromboplastin time were higher in group 1, and much lower, although still above normal in group 2. Fibrinogen was significantly lower in group 2 (75 +/- 35 v 219 +/- 64 mg/dL group 1), and, although the platelet count was lower in group 2 (142 +/- 76 x 10(3)/mm3 v 225 +/- 167 x 10(3)/mm3), it was clinically acceptable. These results encouraged us to discontinue heparin when faced with severe hemorrhage in four patients on ECMO, rather than withdraw support at a time when there was little chance of survival. Heparin was discontinued for 10.5 +/- 6 hours. The mean ACT was reduced from 220 +/- 23 seconds to 144 +/- 22 seconds. One patient, who required repair of gastric necrosis while on ECMO following repair of a congenital diaphragmatic hernia, survived and had a decrease in blood loss from 2 to 0 mL/kg/h after the heparin was discontinued. One of the three patients who died had an autopsy with no evidence of thrombosis. We conclude that it may be reasonable to discontinue heparin in the face of life-threatening hemorrhage while on ECMO.

Effect of extracorporeal membrane oxygenation on body water content and distribution in lambs.

Water content of the various body compartments were estimated immediately after beginning extracorporeal membrane oxygenation (ECMO), and daily thereafter for 3 days, in seven healthy 2-month-old lambs. Total body water, extracellular water, and plasma volume were estimated simultaneously by 18O, bromide, and T-1824 dilution, respectively. Volumes of intracellular water, interstitial water, blood, and red cells were calculated from the experimental estimates. No statistically significant changes occurred in the water content of the various body compartments in relation to duration of ECMO. The data suggest that water retention, clinically noted in human neonates treated with ECMO for persistent pulmonary hypertension, may be related to the primary disease process and/or its medical management, rather than to ECMO.

Complications of prematurity that may require surgical intervention.

Many complications related to prematurity may require surgical intervention. Between July 1981 and July 1987, treatment of patent ductus arteriosus (PDA) (228 patients), necrotizing enterocolitis (NEC) (49 patients), and complications of high-pressure ventilation (eight patients) was reviewed. A PDA was ligated in 136 patients, with one death and one complication. Ninety-two patients had treatment with indomethacin, with 35 failures. A PDA was associated with NEC in 37 of the 49 patients, with a 73% mortality when they occurred within 72 hours of each other. Two patients died following pulmonary resection for lung cysts. The two patients with pneumoperitoneum and pneumopericardium were successfully treated with tube drainage. A PDA ligation was successful, with low mortality and morbidity. Treatment with indomethacin was unsuccessful in 38% of patients. There is a high mortality when NEC and PDA occur within 72 hours of each other.

Jejunal diverticulosis.

Forty-seven patients with jejunal diverticulosis were identified at the University California, Davis Medical Center, Sacramento, by a review of patient medical records from 1980 to 1986. Fourteen patients had complications that could be directly attributed to the presence of diverticula. Six patients had evidence of a malabsorption syndrome and responded to administration of broad-spectrum oral antibiotics. One patient had recurrent bouts of an asymptomatic pneumoperitoneum. A total of seven patients required operative intervention for the following conditions: massive gastrointestinal tract bleeding, two patients; mechanical small-bowel obstruction, two patients; and diverticulitis with perforation, three patients. One patient died. Nineteen patients had symptoms of epigastric pain, early satiety, and bloating for which no cause other than the presence of jejunal diverticulosis was found. Jejunal diverticulosis was an incidental finding in 14 patients treated for other gastrointestinal tract problems.

Prolonged extracorporeal membrane oxygenation in sheep with a hollow-fiber oxygenator and a centrifugal pump.

ECMO with a roller-pump employs two potentially thrombogenic devices: the servoregulator bladder and heat exchanger. To eliminate these we used an 0.8 m2 Capiox II hollow-fiber oxygenator ventilated with warmed humidified oxygen and a Bio-Medicus centrifugal pump with a 1/4 inch head at a flow of 250 cc/min in six sheep during 96 hr of ECMO each. Oxygenator performance and plasma Hgb were determined, as were the volume, electrolyte, and protein content of fluid accumulating in the gas phase of the oxygenator. Mean oxygen transfer was 15.78 +/- 3.15 ml/min, and mean differences in PaO2 between blood entering and leaving the oxygenator was 360 +/- 49 mmHg. Mean plasma Hgb was 24.7 +/- 12.8 mg/dl. Fluid in the gas phase of the oxygenator was less than 75 ml/day and contained no albumin, protein, sodium, potassium, or chloride. Centrifugal pumps have been associated with hemolysis at low flows, but this may have been due to the simultaneous use of silastic membrane oxygenators that have high resistance. Hollow-fiber oxygenators have been associated with early failure of gas exchange and fluid accumulation in the gas phase. This may have been due to ventilation with dry gas. We conclude that a hollow-fiber oxygenator and a centrifugal pump can provide excellent gas exchange, acceptable hemolysis, and little fluid loss.

Association of closure of patent ductus arteriosus and development of necrotizing enterocolitis.

Over a 5-year period ending in June 1986, 234 neonates with evidence of a significant patent ductus arteriosus (PDA) underwent ductal manipulation. Thirty-four infants (15%) developed evidence of necrotizing enterocolitis (NEC). When NEC and treatment of PDA were within 72 hours of each other, there was a 71% mortality rate. When NEC and PDA ligation were greater than 72 hours apart, there were no deaths. Development of NEC prior to ductal closure was associated with a mortality of 57%, as opposed to no mortality when the development of NEC occurred after ductal closure. Our data suggest that infants who develop NEC before PDA ligation incur a high mortality.

Management of patent ductus arteriosus: a comparison of operative v pharmacologic treatment.

Over a 5-year period ending June 1986, 183 premature infants with evidence of a hemodynamically significant patent ductus arteriosus (PDA) associated with cardiopulmonary compromise underwent pharmacologic and/or surgical ductal manipulation. One hundred seven infants underwent surgical ligation and 76 initially received indomethacin. The average birth weight was 10% less and 1 week less for the surgically treated v the indomethacin-treated infants. Among the infants undergoing ligation, there were no failures of therapy and one surgically related complication. Among the infants receiving indomethacin, 42% failed to improve, and 84% of these infants required surgical intervention. Those infants who failed indomethacin therapy in general weighed less, had a shorter gestation and required prolonged ventilatory support. In no instance was death directly attributable to either therapeutic modality. Our data suggest that surgical ligation of hemodynamically significant PDA yields a more predictable result with low morbidity and no mortality. We believe it is the preferred treatment for premature infants less than 800 g.

Reduction of polymorphonuclear leukocyte accumulations by inhibition of cyclooxygenase and thromboxane syntase in the rabbit.

Thromboxane (Tx) inhibition prevents pulmonary leukostasis after acid aspiration. This observation prompted study of polymorphonuclear leukocyte (PMN) accumulations and products of cyclooxygenase. Experiments were conducted with a skin abrasion preparation. Five groups of six rabbits were pretreated intravenously with: (1) placebo, (2) ibuprofen, (3) imidazole and two other Tx syntase inhibitors, (4) OKY 1555, or (5) OKY 046. Zymosan-activated serum (ZAS) and leukotriene B4 were used as chemotaxins and balanced salt solution as control. After pretreatment with placebo, PMN accumulation in leukotriene B4 sites was 2130 +/- 874 PMN/mm3 (mean +/- SD). Pretreatment with ibuprofen, imidazole, or OKY 046 decreased (p less than 0.05) accumulations to 205 +/- 139 PMN/mm3, 485 +/- 387 PMN/mm3, and 504 +/- 260 PMN/mm3, respectively. In ZAS sites, placebo pretreatment led to 2006 +/- 866 PMN/mm3, while the ibuprofen, imidazole, and OKY 046 groups had decreased (p less than 0.05) responses of 295 +/- 218 PMN/mm3, 444 +/- 477 PMN/mm3, and 386 +/- 151 PMN/mm3, respectively. Pretreatment with OKY 1555 did not produce significant reductions in response. Six animals in each group received intradermal injections of the two chemotaxins or Hank's balanced salt solution. Reduction in PMN accumulations after cyclooxygenase and Tx inhibition were similar to those observed in the skin abrasion preparation. Pretreatment with either ibuprofen, imidazole, or OKY 046 resulted in a decreased concentration of Tx in abrasion fluid exudate in response to leukotriene B4, 275 +/- 164 pg/ml, 460 +/- 144 pg/ml, and 440 +/- 260 pg/ml, respectively, as compared with 1168 +/- 380 pg/ml in the placebo group. The reduced responses were not the result of a decrease in regional perfusion as measured by 133Xe washout. The in vitro chemotactic response of PMN to leukotriene B4 and ZAS was unchanged after incubation in either ibuprofen, imidazole, OKY 1555, or OKY 046. These data show that cyclooxygenase and Tx syntase are integrally associated with PMN accumulations.

Vascular access for hemodialysis. Patency rates and results of revision.

Over a 4-year interval, 324 arteriovenous conduits were created in 256 patients with end-stage renal disease as access for chronic hemodialysis. These included 154 Cimino fistulae, 163 polytetrafluoroethylene (PTFE) grafts, and seven miscellaneous grafts. Satisfactory patency rates were demonstrated for as long as 4 years for both Cimino fistulae and PTFE grafts by life-table analysis. Failures of Cimino fistulae usually occurred early in the postoperative period, secondary to attempts to use inadequate veins. Thrombosis caused the majority of PTFE graft failures and was generally the result of venous stenosis. Correction of such venous stenosis is mandatory to restore graft patency and can result in prolonged graft survival.

Chemotactic activity of plasma and lung lymph in sheep with endotoxemia: effect of hydroxyl radical scavengers.

The formation and release of circulating chemoattractants has been considered to be responsible for the initial pulmonary leukostasis and subsequent pulmonary vascular injury seen with endotoxemia. Oxygen radicals released from granulocytes can produce these factors. Our purpose was (1) to determine whether chemotaxins are released with endotoxemia and whether the lung is the source of these factors and (2) if there is a cause and effect relationship between the release of chemoattractants and the lung injury. Lung lymph flow, QL, lymph protein clearance, and vascular pressures were used to monitor lung vascular integrity. Escherichia coli endotoxin was infused into 12 sheep. Six sheep were pretreated with dimethyl thiourea (DMTU), a scavenger of hydroxide ion radicals. Chemotactic activity (CA) of plasma and lung lymph was determined during baseline, the pulmonary hypertensive phase, and the permeability phase of the lung injury. It was found that endotoxemia was associated with generation of a granulocyte chemotactic factor in plasma but not in lung lymph. The peak increase in plasma CA occurred after the early pulmonary leukostasis. Pretreatment with DMTU eliminated the increased CA but had no effect on the initial leukopenia or the lung injury. It was concluded that (1) the lung is not the major source of increased CA after endotoxin and (2) increased plasma CA occurs but does not appear to be causative of the initial pulmonary leukostasis or the granulocyte-induced lung injury.