Tarou Ikeda

Role of Nitric Oxide in the Colon of Patients With Slow-Transit Constipation

AbstractPURPOSE: The cause of dysmotility in patients with slow-transit constipation is unknown. Nitric oxide has recently been shown to be a neurotransmitter in the nonadrenergic, noncholinergic inhibitory nerves of the human gut. To clarify the physiologic significance of nitric oxide in the colon of patients with slow-transit constipation, we investigated the enteric nerve responses in lesional and normal bowel segments derived from patients with slow-transit constipation and patients who underwent colon resection for colonic cancers. METHODS: Twenty-six preparations were taken from colonic lesions in eight patients with slow-transit constipation (2 men; age, 23 to 69 (mean, 44.8) years). Forty-two preparations were taken from the normal colons of 14 patients with colonic cancer (8 men; age, 40 to 66 (mean, 52.4) years). A mechanographic technique was used to evaluate in vitro muscle responses to electric field stimulation before and after treatment with various autonomic nerve blockers, NG-nitro-L-arginine, and L-arginine. RESULTS: The colons of patients with slow-transit constipation were more strongly innervated by nonadrenergic, noncholinergic inhibitory nerves than were normal colons (P <0.05). Nitric oxide was found to act on both normal and slow-transit constipation colons. The colons of patients with slow-transit constipation were more strongly innervated by nitric oxide nerves than were normal colons (P < 0.01). Responses to electric field stimulation were the same in each case among the normal colons and were also the same in each case among the slow-transit constipation colons. CONCLUSION: These findings suggest that an increase of nitric oxide mediates nonadrenergic, noncholinergic inhibitory nerves and plays an important role in the dysmotility observed in the colons of patients with slow-transit constipation.

Pancreatitis complicated with dilated choledochal remnant after congenital choledochal cyst excision

We describe here three cases of pancreatitis after congenital choledochal cyst excision. In these three cases, the choledochal remnant in the pancreas head was markedly dilated, probably because of an incomplete resection of the cyst at the primary operation, and an increase in intraluminal pressure of the pancreatic duct caused by a dynamic obstruction by a protein plug or a pancreatic calculus. Complete cyst excision, including the choledochal wall in the pancreas, is therefore strongly recomended.

Spontaneous localized intestinal perforation and intestinal dilatation in very-low-birthweight infants.

Aim: To elucidate how spontaneous localized intestinal perforation (SLIP) is related to intestinal morphological features such as dilatation in very‐low‐birthweight (VLBW) infants. Methods: The medical records of 13 VLBW infants (<1500 g) undergoing laparotomy between 1983 and 2003 for presumed SLIP were retrospectively reviewed. Clinical findings including maternal, prenatal and perinatal factors were analysed, and the clinical and surgical findings upon laparotomy were compared. Results: Postnatal pathological conditions included patent ductus arteriosus (n= 7), sepsis (n= 2), respiratory distress syndrome (n= 7), intraventricular haemorrhage (n= 2), an indwelling catheter via the umbilical vein (n= 1) and pneumonia (n= 1). Indomethacin was used in seven neonates with patent ductus arteriosus, and dexamethasone preventive therapy was employed in one neonate for bronchopulmonary dysplasia. Operative findings revealed a localized small punched‐out perforation in the ileum. Five patients had intestinal dilatation: two with a perforation in the middle of the dilated intestine, and three with a perforation proximal to the region of dilatation. The muscularis propria was absent in the dilated intestine of four patients.

Study of segmental colonic transit time in healthy men.

BACKGROUND/AIMS There are few reports of the segmental colonic transit time (SCTT) in healthy men. To clarify the SCTT for healthy men, the author measured the SCTT of healty men using radiopaque markers (RM). METHODOLOGY The author analyzed the SCTT of 26 healthy men, who were aged from 24 to 60 years and had a mean age of 48.8 years, with RM (20 radiopaque polyvinyl chloride 0-rings). The criteria for participation included a usual stool frequency of between three per week and three per day, no history of gastrointestinal disease, and no use of medications known to affect gastrointestinal motility. RESULTS The overall gastrointestinal transit time was 36.2±5.1 hours, and the transit time from the mouth to the cecum was 6.8±1.4 hours. The half-dose transit times of the ileocecal valve, hepatic flexure, splenic flexure, descending-sigmoid line, and evacuation were 6.9±1.6, 15.9±1.7, 18.8±1.7, 24.3±4.4 and 36.4±5.3 hours, respectively. The ascending (9.5±2.3 hours) and descending colon (5.5±4.1 hours) had shorter transit times than the sigmoid-rectum section (12.7±2.1 hours) (p<0.001, p<0.01, respectively), and the transverse colon (4.2±2.1 hours) had a shorter transit time than the ascending colon (p<0.05). There were no significant differences in transit time between the descending and transverse colon. CONCLUSIONS Measuring the SCTT using RM may be effective for detecting the SCTT of specific sections of the bowel. This method is simple and can be easily performed at any radiology department.

Pancreatitis After a Primary and Secondary Excision of Congenital Choledochal Cysts

PurposePancreatitis has been reported long after total choledochal cyst excision. The aim of this study was to determine if the disease process of postoperative pancreatitis differs between a primary and secondary cyst excision in a long-term follow-up.MethodsAmong 53 postoperative patients who underwent a total cyst excision and were followed up, 44 patients underwent a primary cyst excision (primary excision group), while 9 patients underwent a secondary cyst excision after a previous cyst-duodenostomy for internal drainage (secondary excision group). The long-term clinical course, including the pancreatographic findings after a total cyst excision, was compared.ResultsIn the primary excision group, six patients had mild pancreatitis. Endoscopic retrograde pancreatography demonstrated ductal dilatation that was limited to the common channel in two patients, concurrent with the ventral duct in three, and extended the duct of Santorini in three. Conservative treatments were carried out in three patients, and endoscopic irrigation in one patient with protein plugs in the ventral duct. A resection of the choledochal remnant in the pancreas was performed in two patients with choledochal remnant-associated pancreatitis. From the secondary excision group, 5 of the 9 patients had chronic pancreatitis. Endoscopic retrograde pancreatography showed entire pancreatic ductal dilatation. Two of these patients underwent duodenal papilloplasty at the same time as secondary surgery; however, the disease progressively worsened.ConclusionIn patients undergoing a secondary total excision after internal drainage, it is difficult to half the ongoing aggravating process in pancreatitis.

Surgical technique for the transperineal approach of anterior levatorplasty and recto-vaginal septum reinforcement in rectocele patients with soiling and postoperative clinical outcomes.

BACKGROUND/AIMS To clarify the significance of a transperineal approach of anterior levatorplasty (ALP) and recto-vaginal septum reinforcement in rectocele patients with soiling, we reported the surgical technique and clinical outcomes two years after this operation. METHODOLOGY Twelve female patients (33-82 years, average 63.3) complaining of defecation disorders (disturbed defecation including excessive straining during defecation, sensation of incomplete defecation and manual assistance of digitation of the vagina) with soiling underwent the following surgical technique: under spinal anesthesia, rectal wall was opened up to the end of the rectal wall weakness. Rectocele in the weak rectal wall was horizontally sutured. Before closing wound ALP was fashioned. RESULTS In clinical outcomes, excessive straining during defecation, sensation of incomplete evacuation and defecation by manual assistance were statistically significantly reduced postoperatively after a follow-up of 2 years (p<0.01, p<0.01, p<0.0001, p<0.01, respectively). As an early postoperative complication, perineal wound infection was noted in one patient. Late postoperative complications were not noted in any patient. In overall patient satisfaction 2 years after operation, half of the patients were excellent and no patients were poor. CONCLUSIONS Combined repair of rectocele and ALP by transperineal approach may be a useful procedure for correcting rectocele with soiling. This procedure is also easy and safe.

Anorectal Manometric Studies in Patients with Symptomatic and Asymptomatic Rectocele.

排便障害 (残便感, 便秘, 排便困難, 会陰部重圧感など) の有無により, rectocele例 (全例女性;有症状38例, 無症状16例) の病態生理学的相違があるかどうかの解明を目的に, 直腸肛門内圧検査法を用いて, 排便異常のない女性 (16例) を対照に比較検討した. その結果, 排便障害の有無に関係なく, 内・外肛門括約筋機能 (対照に比較して, 肛門管最大静止圧と肛門管最大随意収縮圧は明らかに低値), 直腸貯留能 (対照に比較して, 直腸最大耐容量は低値, コンプライアンスは明らかに低値), 直腸感覚能 (直腸最小知覚量と直腸最小耐容量は高値) などの低下を認めた. そして, 直腸内圧は対照より明らかに高値を示した. すなわち, rectocele例では, 排便障害の有無に関係なく, 直腸壁の弾性能低下に高い直腸内圧が存在していることが判明した. これらのことは, rectoceleの成因に関与している可能性を示唆するものと思われた.