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| ID | Type | Description | Link |
|---|---|---|---|
| 2026-A00636-45 | Other Identifier | ANSM |
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Severe functional constipation associated with a pathological increase in rectal volume, with or without colonic dilation, is known as megarectum. In the absence of an organic cause, megarectum is called idiopathic. This condition can begin at birth, in childhood, or in adulthood. The exact incidence of idiopathic megarectum (IM) is unknown, but it is considered a rare condition. Clinically, IM is usually considered in the context of chronic constipation that is refractory to traditional treatments and accompanied by rectal distension, abdominal pain, encopresis, and recurrent fecal impaction. The pathophysiological basis of IM remains poorly understood. A study using a rectal barostat-a device that measures rectal capacity and compliance (the rectum's ability to distend) by controlled distension of a rectal balloon-identified two distinct subgroups of patients with MI: (1) those with increased rectal compliance, who can be described as having "physiological" megarectum, in which marked rectal hyposensitivity-characterized by the absence of perception of rectal distension-and hypocontractility lead to chronic fecal accumulation and progressive overdistension due to loss of rectal elasticity; and (2) those with normal rectal compliance, who can be considered to have anatomical megarectum. It is not yet known whether these subgroups reflect different underlying etiologies. Furthermore, in patients with physiological megarectum, it is unclear whether the condition is primary or secondary to long-term rectal distension.
The aim of this study is to identify and characterize elements of the clinical history, particularly early ones, associated with the disease, in order to contribute to the understanding of its pathophysiology.
To this end, the project aims to analyze the personal and family histories of patients with idiopathic bowel dysfunction (BD) and compare them with a population of constipated patients without BD, in order to determine the chronology of the onset of the condition (from birth, childhood/adolescence, or later) and to evaluate the risk factors for BD. It is also planned to describe the population of patients with BD to confirm whether or not different subgroups exist.
A better understanding of the pathophysiology of BD should make it possible to prevent the condition (if secondary to dyssynergia present in childhood) and/or to provide earlier, more appropriate management, thus avoiding acute episodes of bowel obstruction.
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Idiopathic megarectum group | Other | questionnaires documented by patients with suspected megarectum on anorectal manometry and confirmed by rectal barostat | ||
| Constipated patient group | Other | questionnaires completed by adult patients consulting for functional constipation without suspected megarectum on anorectal manometry |
| Measure | Description | Time Frame |
|---|---|---|
| To determine if patients with Idiopathic MegaRectum (MI) have a history of earlier constipation in childhood than constipated patients without megarectum | This involves comparing the history of constipation that may reveal anorectal dysfunction in childhood in constipated adults with MI and in constipated control subjects without megarectum through clinical questioning. | 1 day |
| To determine if patients with Idiopathic MegaRectum (MI) have a history of more digestive symptoms in childhood than constipated patients without megarectum | This involves comparing the history of digestive symptoms that may reveal anorectal dysfunction in childhood in constipated adults with MI and in constipated control subjects without megarectum through clinical questioning. | 1 day |
| Measure | Description | Time Frame |
|---|---|---|
| Comparison of environmental factors in constipated adults with MI and in constipated control subjects without megarectum | Determination of the presence of environmental factors in childhood: breastfeeding, repeated early antibiotic therapy, drug treatment in childhood and indication (antibiotics, anticholinergic treatments, opiates, morphine, etc.) through clinical questioning | 1 day |
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Inclusion Criteria:
Constipated group:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Nabila NL LAAJAIL, Director | Contact | 02 32 88 82 65 | +33 | Nabila.Laajail@chu-rouen.fr |
| vincent VF FERRANTI, ARC | Contact | 02 32 88 82 65 | +33 | Vincent.Ferranti@chu-rouen.fr |
| Name | Affiliation | Role |
|---|---|---|
| Anne-Marie AL LEROI, Professor | University Rouen Hospital | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Digestive Physiology Department | Rouen | 76031 | France |
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| Comparison of environmental factors in constipated adults with MI and in constipated control subjects without megarectum | Presence of psychosocial factors in childhood: psychosocial or school-related stress, anxiety and depressive disorders as revealed by clinical questioning | 1 day |
| megarectum phenotyping | The aim is to phenotype the megarectum using anorectal manometry to distinguish an "acquired" profile from a "congenital" profile. The measured indicators will be anal tone, amplitude and duration of voluntary contraction, the presence of the rectoanal inhibitory reflex; the amplitude of the rectoanal inhibitory reflex at 30 ml of rectal distension; the presence of rectosphincter dyssynergia; the amplitude of rectal contraction during straining; the percentage of anal relaxation during straining; the residual pressure during straining; the threshold volume for perceiving rectal distension; the constant perceiving volume; the maximum tolerable volume; and rectal compliance. | 1 day |
| megarectum phenotyping | The aim is to phenotype the megarectum using Balloon evacuation test is to assess a patient's ability to evacuate stools, particularly in cases of constipation or suspected defecation disorder. This test is based on the concept of success or failure. Success: The patient manages to expel the balloon within a timeframe considered normal (often < 1 to 2 minutes, according to protocols). This suggests that the recto-anal evacuation mechanism is generally functioning correctly. Failure: The patient is unable to expel the balloon or takes an abnormally long time. This may indicate a defecation disorder, for example: anorectal dyssynergia (poor muscle coordination), rectal hypocontractility, or a functional obstruction to evacuation. | 1 day |
| megarectum phenotyping | The aim is to phenotype the megarectum using rectal Barostat is to allow the measurement of rectal distension volumes to obtain the desired rectal pressure | 1 day |
| megarectum phenotyping | The aim is to phenotype the megarectum using rectal Barostat is to allow the measurement of rectal distension volumes to obtain the rectal compliance | 1 day |
| megarectum phenotyping | The aim is to phenotype the megarectum using rectal Barostat is to allow the measurement of rectal distension volumes to obtain the maximum tolerable volume; | 1 day |
| megarectum phenotyping | The aim is to phenotype the megarectum using imagery is to assess rectal size in diameter | 1 day |
| megarectum phenotyping | The aim is to phenotype the megarectum using imagery is to assess colon size in diameter | 1 day |
| Constipation Severity Score Evaluation | This assessment is carried out using the Kess scores. The KESS score (KESS score = Knowles-Eccersley-Scott Symptom score) is intended to assess the severity of chronic constipation. It takes into account: frequency of bowel movements; difficulty passing stool; feeling of incomplete evacuation; use of laxatives; pain or straining; duration of the problem. The higher the score, the more severe the constipation. | 1 day |
| Constipation Severity Score Evaluation | This assessment is carried out using the Francis scores. The Francis score (or IBS-SSS: Irritable Bowel Syndrome Severity Scoring System) is used to measure the severity of Irritable Bowel Syndrome. It assesses: intensity of abdominal pain; frequency of pain; bloating/distension; bowel movement irregularities; and impact on quality of life. The total score ranges from 0 to 500: < 75: no or very mild symptoms; 75-175: mild; 175-300: moderate; 300: severe. | 1 day |
| fecal incontinence severity score | The Cleveland Clinic score will be used to assess the severity of chronic constipation. This score assesses several factors: frequency of bowel movements; difficulty of defecation; straining; feeling of incomplete evacuation; abdominal pain; time spent on the toilet; need for assistance (laxatives, enemas, digital defecation); duration of constipation. Each item is assigned a number of points. In practice: < 8: mild constipation; 8-15: moderate constipation; > 5: severe constipation | 1 day |
| Quality of life score assessment | The quality of life score will be assessed using the GIQLI questionnaires. The GIQLI (Gastrointestinal Quality of Life Index) is a questionnaire used to measure quality of life related to digestive diseases. The questionnaire comprises 36 questions. Each question is scored from 0 to 4 on the following scale: 0 = very poor condition / significant symptoms 4 = no problems The maximum score is 144. A high score indicates good digestive health. A low score indicates significant impact of digestive disease. | 1 day |
| Quality of life score assessment | The quality of life score will be assessed using the PAC-QOL questionnaire. The PAC-QOL (Patient Assessment of Constipation - Quality Of Life) is a specific questionnaire used to assess the impact of chronic constipation on quality of life.The questionnaire typically contains 28 questions divided into several areas: 1) physical discomfort; 2) psychosocial discomfort; 3) worries/concerns; 4) satisfaction. Each item is rated on a scale of 0 to 4. A low score indicates a good quality of life; A high score indicates a significant impact of constipation. | 1 day |
| Quality of life score assessment | The quality of life score will be assessed using the FIQL questionnaires. The FIQL (Fecal Incontinence Quality of Life Scale) is a questionnaire designed to assess the impact of fecal incontinence on quality of life. The FIQL measures the psychological, social, and emotional impact of fecal incontinence, going beyond simply the frequency of leakage. It explores, in particular: social discomfort; anxiety; self-image; limitations in daily activities; emotional impact. The FIQL comprises 29 questions divided into 4 domains: 1) Lifestyle; 2) Behavior; 3) Depression/Self-Perception; 4) Embarrassment. Each question is scored on a scale of 0 to 4. A high FIQL indicates a better quality of life. A low FIQL indicates a significant impact of incontinence. | 1 day |
| Predictive factors for each of these profiles in terms of medical history | Identify predictive factors for each of these profiles in terms of family history during the clinical interview with the patient (severe constipation leading to surgery (and type of surgery) or difficult to treat medically, onset of constipation in childhood or adulthood, Hirschsprung's disease, colonic inertia, chronic intestinal pseudo-obstruction, gastroparesis, stoma, gastrostomy, enteral or parenteral nutrition, anorectal malformation, neurological malformation) | 1 day |
| Predictive factors for each of these profiles in terms of medical history | Identify the predictive factors of each of these profiles in terms of personal history during the clinical interview with the patient (severe constipation requiring surgical intervention (and type of intervention) or difficult to treat medically, onset of constipation in childhood or adulthood, Hirschsprung's disease, colonic inertia, chronic intestinal pseudo-obstruction, gastroparesis, stoma, gastrostomy, enteral or parenteral nutrition, anorectal malformation, neurological malformation). | 1 day |
| Current symptoms | Identify current symptoms: encopresis, fecal incontinence, dyschezia, abdominal bloating, abdominal pain, number of bowel movements per week, stool consistency according to the Bristol Stool Scale | 1 day |
| Predictive factors for each of these profiles in terms of medical history | information search regarding the age of toilet training in childhood during the clinical interview with the patient. | 1 day |
| Predictive factors for each of these profiles in terms of medical history | information search regarding childhood digestive symptoms during the clinical interview with the patient. | 1 day |
| Predictive factors for each of these profiles in terms of medical history | information regarding stool frequency in childhood and stool consistency in childhood during the clinical interview with the patient. | 1 day |
| Predictive factors for each of these profiles in terms of medical history | research for information regarding the factors identified as triggers of constipation during the clinical interview with the patient. | 1 day |
| Predictive factors for each of these profiles in terms of medical history | information search regarding possible pain during defecation during the clinical interview with the patient. | 1 day |