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Biomedical subjects

E Corazziari

Publications and source records attributed to E Corazziari.

At least 55 records · Page 3Linked to original sources
PubMed1994

Hepatoduodenal bile transit in cholecystectomized subjects. Relationship with sphincter of Oddi function and diagnostic value.

The hepatic hilum-duodenum transit time (HHDT) was evaluated in cholecystectomized subjects to assess its relationship with the motor function of the sphincter of Oddi (SO) and its diagnostic accuracy in the detection of SO dysfunction. The study was performed in asymptomatic controls and symptomatic patients with SO dysfunction before and after sphincterotomy. HHDT showed a direct correlation with manometric SO maximal basal pressure (r = 0.77; P < 0.001) but not with SO phasic activity. In sphincterotomized subjects HHDT did not differ from that of the asymptomatic subjects, and HHDT, which was prolonged before sphincterotomy, normalized after sphincterotomy. HHDT had a 100% specificity and an 83% sensitivity in diagnosing SO dysfunction when compared to SO manometry. In conclusion, the cholescintigraphic HHDT is mainly related to the SO maximal basal pressure, presenting an elevated specificity and a satisfactory sensitivity in the diagnosis of SO dysfunction in cholecystectomized subjects.

Adult↗
PubMed1994

Effects of intraluminal acidification on oesophageal motor activity.

This study assessed the effect of prolonged intraluminal acidification on the motor activity of the entire oesophageal body (under controlled conditions). Intraoesophageal pressures were recorded in 13 endoscopy negative subjects with gastro-oesophageal reflux disease in whom saline, HC1 0.1 N, and saline solutions were infused (1.5 ml/min) blindly in the oesophageal body, 6 cm distal to the upper oesophageal sphincter for three consecutive periods of 45 minutes each. These findings were compared with those of a control group. Intraoesophageal acidification caused an increase in the deglutition frequency (p < 0.02), the occurrence of multipeaked waves (p < 0.04) as well as a decrease of the propagating velocity (p < 0.04) of the primary peristaltic contractions. Furthermore, intraoesophageal acidification determined an increase, at all levels of the oesophagus, of the duration (p < 0.04) and, more noticeable in the proximal oesophageal body, of the amplitude (p < 0.02) of primary peristaltic contraction waves. In conclusion prolonged intraoesophageal acidification can considerably affect frequency of deglutition, morphology, and propagating patterns of primary peristaltic contractions. This study shows that these effects are independent from volume distension of the oesophagus and supports the presence of acid sensitive receptors in the oesophageal mucosa.

Adult↗
PubMed1994

Intravariceal pressure measurement in cirrhotic patients: is it a reliable technique?

The aim of the present study is to evaluate in both "in vitro" and clinical conditions the reliability of the method for measuring the oesophageal varices pressure by means of a sclerosing needle. The perfusion system was validated "in vitro", comparing the tracings obtained with two different perfusion apparatus, with two different perfusional agents and with the needle either completely or partially inserted in a venous catheter perfused with saline solution, either in the same direction as the flow or the opposite one. The clinical validation was conducted on 14 cirrhotic patients with II to IV grade oesophageal varices according to Dagradi's classification. During endoscopy, the intravariceal and oesophageal pressures were measured using a sclerosing needle, perfused with hydrosoluble contrast medium. Once the intravariceal pressure measurement was completed, an X-ray film of the chest was performed. The data were evaluated considering the absence of visible contrast medium as evidence of correct intravariceal needle position, and the presence of a roundish image as evidence of paravariceal insertion of the needle. The presence of respiratory oscillations and intravariceal pressure values were verified in manometric tracings and were compared with radiological findings. The "in vitro" tests showed no differences in the pressure recording obtained using different pumps, different perfusion agents and with different manners of inserting the needle. Only twenty-eight of the manometric recordings were considered adequate for evaluation in clinical conditions.(ABSTRACT TRUNCATED AT 250 WORDS)

Esophageal and Gastric Varices↗
PubMed1994

Gallbladder volume variations after meal ingestion.

OBJECTIVE: To assess gallbladder (GB) volume variations in response to a standard meal. METHODS: We assessed these variations with ultrasonography at brief intervals over the postprandial period, which included the emptying and refilling phases of the GB. RESULTS: During both emptying and refilling of the GB, the volume fluctuated continuously, with brief alternating volume decrements and increments. The phases of emptying and refilling appear to be the net result of the algebraic sum of these volume fluctuations. In the emptying phase, the volume decrements showed a greater volume (35.7 +/- 10.7 ml vs. 14.8 +/- 8.4 ml) and lasted longer (158 +/- 37 min vs. 85 +/- 44 min) than the volume increments, whereas the opposite took place in the refilling phase (4.3 +/- 3.4 ml vs. 16.4 +/- 12.2 ml; 39 +/- 20 min vs. 84 +/- 37 min). CONCLUSION: It is probable that the continuous GB volume fluctuations are the expression of hepatic bile recycling in the GB during the entire postprandial period, and the amount of bile recycled by the GB is greater during the emptying than the refilling phase.

Adult↗
PubMed1993

U.S. householder survey of functional gastrointestinal disorders. Prevalence, sociodemography, and health impact.

Our objective was to obtain national data of the estimated prevalence, sociodemographic relationships, and health impact of persons with functional gastrointestinal disorders. We surveyed a stratified probability random sample of U.S. householders selected from a data base of a national market firm (National Family Opinion, Inc.). Questions were asked about bowel symptoms, sociodemographic associations, work absenteeism, and physician visits. The sampling frame was constructed to be demographically similar to the U.S. householder population based on geographic region, age of householder, population density, household income, and household size. Of 8250 mailings, 5430 were returned suitable for analysis (66% response). The survey assessed the prevalence of 20 functional gastrointestinal syndromes based on fulfillment of multinational diagnostic (Rome) criteria. Additional variables studied included: demographic status, work absenteeism, health care use, employment status, family income, geographic area of residence, population density, and number of persons in household. For this sample, 69% reported having at least one of 20 functional gastrointestinal syndromes in the previous three months. The symptoms were attributed to four major anatomic regions: esophageal (42%), gastroduodenal (26%), bowel (44%), and anorectal (26%), with considerable overlap. Females reported greater frequencies of globus, functional dysphagia, irritable bowel syndrome, functional constipation, functional abdominal pain, functional biliary pain and dyschezia; males reported greater frequencies of aerophagia and functional bloating. Symptom reporting, except for incontinence, declines with age, and low income is associated with greater symptom reporting. The rate of work/school absenteeism and physician visits is increased for those having a functional gastrointestinal disorder. Furthermore, the greatest rates are associated with those having gross fecal incontinence and certain more painful functional gastrointestinal disorders such as chronic abdominal pain, biliary pain, functional dyspepsia and IBS. Preliminary information on the prevalence, socio-demographic features and health impact is provided for persons who fulfill diagnostic criteria for functional gastrointestinal disorders.

Absenteeism↗
PubMed1993

Real time ultrasonography of the gastric antrum.

This study aimed to evaluate whether serial ultrasound measurements of antral volumes are reproducible and, if so, whether they are representative of the entire gastric contents and reliably measure gastric emptying. The antral volume was measured in man after oral and intragastric administration of known amounts of 5% glucose solutions, and on two separate occasions in the same subjects, after the ingestion of a standardised solid-liquid meal (1050 kcal). Antral volume measurements were performed in both supine and upright positions; inter- and intraobserver measurement errors were also assessed. After ingestion or intragastric administration of equal amounts of liquid, antral volumes determined by ultrasound showed a wide intersubject variability. In each individual subject, however, a linear trend was found between the antral volume and amount of ingested or administered liquid. Intrasubject variability of antral volume measurements was at its minimum in fasting conditions and 300 minutes after ingestion of the solid-liquid meal. Intra- and interobserver variations and whether the patient was erect or supine did not affect measurements of antral volumes. These results support the use of real time ultrasound in determining the gastric emptying time. Results at fasting and 300 minutes after a solid-liquid meal are stable end points of measurement.

Adult↗
PubMed1992

Role of body position, gender, and age on pelvic floor location and mobility.

The location and mobility of pelvic floor in different body positions and their relation to age and gender was assessed in 117 patients (19 men, 98 women, age range 10-77 years) with chronic nonorganic constipation (defined as less than three bowel movements per week for at least three years) by means of defocography. Eleven females (age range 16-69 years), without gastrointestinal symptoms, affected by noninvasive carcinoma of the cervix represented a control group. Pelvic floor location was measured as the distance in centimeters of the anorectal junction from the pubococcygeal line; pelvic floor mobility was measured during squeezing, straining, and defecation assuming the pelvic location at rest as zero reference. Pelvic floor location and mobility did not differ between controls and constipated patients. In both groups pelvic floor location at rest was significantly higher (P = 0.001) with patients lying down than sitting up, whereas pelvic floor mobility during squeezing was greater with the patients sitting up than lying down (P = 0.003). In both positions, pelvic floor location at rest was significantly lower (P = 0.01) in females than in males. Pelvic floor mobility during squeezing was significantly different between gender. Parity and hysterectomy did not appear to affect pelvic floor location. Data emerging from this study indicate that body position is one of the major determinants of the pelvic floor location.

Adolescent↗
PubMed1992

Octylonium bromide in the treatment of the irritable bowel syndrome: a clinical-functional study.

We investigated the effect of octylonium bromide on a number of symptoms and functional aspects of the irritable bowel syndrome. Seventy-two patients complaining mainly of abdominal pain were studied in a double-blind trial (octylonium bromide 40 mg tid for 4 weeks or placebo). Clinical parameters were: abdominal pain, bloating and bowel frequency. Sigmoid manometry with simultaneous recording of the thresholds for distension and/or pain upon graded inflation of an endoluminal balloon was performed before and at the end of treatment. In contrast to placebo, octylonium bromide significantly reduced pain and bloating, and significantly increased (p < 0.02) the pain threshold throughout the treatment period. However, comparison with the placebo group failed to show any relevant differences. Neither treatment influenced the frequency of bowel movement. Sigmoid motility during distension was significantly reduced after octylonium bromide (p < 0.05), but it did not change after placebo. In conclusion, octylonium bromide is capable of reducing symptoms and motor reactivity of the sigmoid in patients with irritable bowel syndrome.

Abdominal Pain↗
PubMed1991

Esophageal motility in children with Hirschsprung's disease.

Esophageal motility was studied in 12 children with Hirschsprung's disease to see if extracolonic motor dysfunction was present in this disorder. Manometric tracings were compared with those from eight children with idiopathic megacolon and from 10 children without esophageal disease or constipation. Amplitude of esophageal contraction waves was significantly higher in children with Hirschsprung's disease than in the other two groups. Swallows that were followed by simultaneous contractions or double-peaked waves were also more common in the group with Hirschsprung's disease (subjects with Hirschsprung's disease, subjects with megacolon, and controls; 57%, 10%, and 8%, respectively). Lower esophageal sphincter characteristics did not differ among the three groups. The increase in simultaneous contractions and double-peaked waves persisted in those children who were reexamined following surgery for Hirschsprung's disease, whereas wave amplitudes fell to a level similar to that observed in the other groups. These data suggest that gastrointestinal motor dysfunction in persons with Hirschsprung's disease is not restricted to the colon, and that some of the observed abnormalities in esophageal motility do not reflect nonspecific responses to megacolon or colonic obstruction.

Adolescent↗
PubMed1991

Perendoscopic manometry of the distal ileum and ileocecal junction in humans.

Previous manometric studies of the ileocolonic junction were performed without assessing the precise spatial relationship between recording sensors and ileocolonic junction. In the present study, the motor activity of the ileocolonic junction was recorded using manometric sensors localized under direct colonoscopic control in 11 patients (4 men, 7 women; mean age, 55 years) referred for hematochezia with normal stool frequency. No medications were administered before and during endoscopy. A perfused catheter (OD 1.7 mm, with three side holes 4 mm apart and marked by evenly spaced black rings in the distal 6 cm) was passed through the biopsy channel of the endoscope and advanced through the ileocolonic junction and 6 cm into the ileum. The catheter was then withdrawn into the cecum by 1-cm steps, and motor activity was recorded for 4-6 minutes at each station. A single catheter taped to the endoscope continuously recorded cecal pressure. An ileocecal pressure gradient could not be identified in the majority of subjects; individual values ranged from -8 to +4 mm Hg, and gradients were maintained over the entire length of the ileum. In the distal ileum, tonic and phasic pressure waves were detected. Tonic variations were present for 70.1% of the recording time, either alone (44%) or together with phasic waves (56%). Phasic waves were present for 10.3% of the recording time and, according to their duration, were subdivided into those compatible with the rate of ileal slow waves and prolonged waves not compatible with the rate of ileal slow waves. Regular phasic waves could be either isolated or in clusters; prolonged waves were always isolated. A similar proportion of regular (27.9%) and prolonged (31.2%) phasic waves propagated aborally along the ileum or from ileum to cecum. Clusters presented an average of 8.7 +/- 0.6 peaks/min, and 44% of them propagated aborally. The manometric characteristics did not vary between the segments 5-3 cm and 2-0 cm proximal to the ileocecal junction. In conclusion, a powerful ileocecal sphincter was not detected at the human ileocecal junction, and motor activity of the distal ileum was characterized by tonic changes and rapid phasic contractions.

Adult↗
PubMed1991

Quantitative cholescintigraphy in the assessment of choledochoduodenal bile flow.

Quantitative cholescintigraphy has been proposed as a noninvasive method to assess function of the sphincter of Oddi in cholecystectomized subjects. The present study evaluated several quantitative cholescintigraphic variables to assess their time-related variability as well as their capability to detect delay of choledochoduodenal bile flow. Cholescintigraphy with 2,6-diethylphenylcarbahoylmethyl diacetic acid 99mTc was performed in 24 cholecystectomized patients with recurrent biliary-like pain, laboratory evidence of bile stasis, normal hepatocellular function tests, and no evidence of choledocholithiasis. The study was also performed in 26 asymptomatic cholecystectomized subjects and repeated at 2-week intervals during identical experimental conditions in 10 of them. Of the following quantitative cholescintigraphic variables investigated, (a) hepatic T peak, (b) 50% hepatic retention (T peak, 1/2), (c) percent hepatic retention at 30 minutes, (d) percent hepatic retention at 40 minutes, (e) vein-hepatic hilum transit time, (f) vein-duodenum transit time, and (g) hepatic hilum-duodenum transit time, only the hepatic hilum-duodenum transit time showed a statistically significant correlation between the duplicate studies. Only vein-duodenum transit time and hepatic hilum-duodenum transit time discriminated the symptomatic from the asymptomatic patients; of the two variables, however, hepatic hilum-duodenum transit time showed less intrasubject variability and no overlap between the two groups of patients. Hepatic hilum-duodenum transit time showed a positive linear correlation with the maximum diameter of the choledochus. It is concluded that in cholecystectomized patients, the hepatic hilum-duodenum transit time appears to detect a delay of bile flow into the intestine better than any other cholescintigraphic variable. However, in patients with a dilated common bile duct, this variable cannot discriminate bile flow delay due to increased choledochal capacity and/or obstruction of the sphincter of Oddi.

Adult↗
PubMed1991

Clinical and functional evaluation of the efficacy of otilonium bromide: a multicenter study in Italy.

Seventy-two patients complaining of abdominal pain were studied in a double blind trial with otilonium bromide (OB) (40 mg tid or placebo). In our patients we performed, before and after the treatment, a clinical evaluation (symptom variations) and functional studies (sigmoid manometry during bowel distension). As regards clinical parameters, otilonium bromide significantly reduced abdominal pain and bloating and significantly increased (p less than 0.02) the pain threshold. However the comparison with the placebo group did not show any difference between the two groups. Sigmoid motility during distension was significantly reduced (p less than 0.05) in OB group, whereas it did not change in the placebo group. We can conclude that, in irritable bowel syndrome (IBS) patients, OB is able to improve symptoms and to reduce stimulated motor activity of the sigmoid.

Abdominal Pain↗
PubMed1990

Oral administration of loxiglumide (CCK antagonist) inhibits postprandial gallbladder contraction without affecting gastric emptying.

The effect of a single oral dose of loxiglumide, a cholecystokinin antagonist, on postprandial gallbladder contraction and on gastric emptying was evaluated in humans. Following a 12-hr fasting period, two tablets of loxiglumide (400 mg each) or placebo was administered on different days, in random order and in a double-blind fashion to 10 healthy volunteers 15 min before the ingestion of a 1050-kcal standard meal. Gallbladder and antral volumes were measured by real-time ultrasonography in basal conditions and at fixed time intervals after the meal. Oral loxiglumide administration was followed by a total inhibition of the gallbladder contraction for 60 min after the end of the meal ingestion. Thereafter, up to the end of the study period, gallbladder volume was larger than that of the placebo study (at 300 min after the meal 2.7 +/- 1.6 ml after placebo and 8.2 +/- 3.5 ml after loxiglumide; P less than 0.008). No difference between placebo and loxiglumide was found in the antral volumes at any time interval (postprandial 63.5 +/- 16.5 ml after placebo and 59.4 +/- 24 ml after loxiglumide; at 300 min after the meal 20.8 +/- 13.3 ml after placebo and 18.9 +/- 9.5 ml after loxiglumide). In conclusion, a single oral dose of loxiglumide at the dose of 800 mg can inhibit postprandial gallbladder contraction without affecting gastric emptying. It would therefore appear that in man endogenous CCK, released after a solid-liquid, caloric, nutrient-balanced meal, plays a major role in the contraction of the gallbladder but does not affect gastric emptying.

Administration, Oral↗
PubMed1990

Pressure relationships within the human bile tract. Normal and abnormal physiology.

Bile is secreted continuously, although at various rates, from the liver into the biliary tree; whether bile is then diverted into the gallbladder or the duodenum depends on the relative resistance to flow mainly determined by the contractile state of the gallbladder and the choledochoduodenal junction. The resistance of the sphincter of Oddi is considered the principal factor in the regulation of the intracholedochal pressure and, therefore, of the common bile duct-gallbladder pressure gradient; however, filling of the gallbladder may also take place after total sphincterotomy. During late phase II of the interdigestive period intragallbladder pressure increments favour flow of a small amount of bile into the bile duct and, through the sphincter of Oddi, into the duodenum. During phase III of the interdigestive period maximal frequency of sphincter of Oddi phasic contractions blocks bile flow into the duodenum. After a meal tonic active contraction of the gallbladder causes an increase of the intraluminal pressure followed shortly by volume reduction of the viscus and outflow of bile accompanied by an intracholedochal pressure increment. Gallbladder hypotonia is a relevant factor in the pathogenesis of gallbladder stones. The gallbladder acts as a reservoir, since intracholedochal pressure is higher after than before cholecystectomy, and this may explain post-cholecystectomy choledochal dilatation and biliary pain by obstructed bile flow due to either stenosis or dyskinesia of the sphincter of Oddi.

Bile↗
PubMed1989

Effects of cisapride on distal esophageal motility in humans.

Peristaltic contractions of the distal esophageal body and lower esophageal sphincter tone were evaluated in patients affected by gastroesophageal reflux disease after either acute intravenous (8.0 mg) administration or two oral doses (5.0 mg and 10.0 mg) of cisapride and in healthy controls after a 10.0-mg oral dose of cisapride. Intravenous cisapride administration enhanced the amplitude and duration of primary peristalsis and the lower esophageal sphincter tone, which reached normal control values. Likewise, the 10.0-mg oral dose effectively enhanced the lower esophageal sphincter resting pressure in both controls and in reflux patients, whereas the amplitude and duration of primary peristalsis was improved only in controls. The 5.0-mg oral dose of cisapride proved ineffective on distal esophageal motor activity in reflux patients. To evaluate whether atropine is capable of modifying the effects of cisapride on distal esophageal motor activity, cisapride was administered intravenously before and during intravenous atropine administration. Effects of cisapride on peristaltic contractions were completely blocked by atropine, irrespective of whether atropine was administered before or after cisapride. The lower esophageal sphincter pressure response to cisapride varied according to the sequence of drug administration, showing no effect when cisapride followed atropine administration and, when this sequence was reversed, no significant atropine-induced inhibition on cisapride-stimulated lower esophageal sphincter pressure. It is suggested that cisapride enhances distal esophageal motor activity by means of a muscarinic receptor mechanism at the level of the distal esophageal body and, at least in part, via a muscarinic-independent mechanism at the level of the lower esophageal sphincter.

Administration, Oral↗