NIPH Clinical Trials Search

ALV01

Basic Information

Recruitment status	Pending
Health condition(s) or Problem(s) studied	Refractory Chronic Constipation
Date of first enrollment	13/05/2026
Target sample size	12
Countries of recruitment
Study type	Interventional
Intervention(s)	Transcatheter ablation of sympathetic nerves surrounding the superior mesenteric artery (SMA) using the investigational device

Outcome(s)

Primary Outcome

(1)Adverse Events(AEs) and Adverse Drug Reactions(ADRs) (2)Serious Adverse Events (SAEs) (3)Device Deficiencies

Secondary Outcome

(1) Change in the Frequency of Spontaneous Bowel Movements (SBMs) (2)Change in the Frequency of Complete Spontaneous Bowel Movements (CSBMs) (3) Change in Quality of Life as Assessed by the Japanese Version of the Patient Assessment of Constipation Quality of Life Questionnaire (JPAC-QOL) Change in Bristol Stool Form Scale Score (5)Change in the Modified Cleveland Clinic Constipation Score (mCSS) (6)Change in the Type and Dosage of Constipation Medications, Excluding Rescue Medications (7) Change in the Type, Dosage, and Frequency of Rescue Medications (8)Improvement in Colonic Transit Time as Assessed by the 3-Day Sitzmarks(R) Method

Key inclusion & exclusion criteria

Age minimum	>= 18age old
Age maximum	Not applicable
Gender	Both
Include criteria	(1)Subjects aged 18 years or older at the time of obtaining informed consent. (2)Subjects who have provided written informed consent. (3)Subjects who meet the diagnostic criteria for chronic constipation according to the Rome IV criteria. (4) Subjects who have fewer than three spontaneous bowel movements (SBMs) per week despite adequate conventional treatment, and who are judged to be refractory to treatment by the principal investigator or sub-investigator. (5) Subjects diagnosed with slow-transit constipation based on the Sitzmarks(R) 3-day method
Exclude criteria	(1)Subjects who meet the Rome IV criteria for irritable bowel syndrome with diarrhea (IBS-D). (2)Subjects with a history of or current inflammatory bowel disease. (3)Subjects with active infectious enteritis at the time of enrollment. (4)Subjects with a history of or current stoma. (5)Subjects with a history of or current functional defecation disorders among functional constipation. (6)Subjects with a history of or current organic defecatory disorder among non-obstructive organic constipation (7) Subjects with drug-induced constipation in whom the causative drug has been identified and for whom improvement is expected through discontinuation or dose reduction of the causative drug, or administration of an antagonist. (8)Subjects with a history of or current stenotic organic constipation. (9)Subjects with a history of or current Hirschsprung's disease or allied disorders. (10)Subjects with hypersensitivity to barium sulfate or any component of Sitzmarks(R). (11)Subjects with allergy to rice bran used in defecography. (12)Subjects with anatomical variations or morphological abnormalities of the superior mesenteric artery (SMA) (e.g., celiacomesenteric type, calcification involving >=50% of the vessel circumference, stenosis, dissection, or aneurysmal dilation (<=70% or >=150% of the normal vessel diameter). (13)Subjects who are unable to discontinue anticoagulant therapy before and after superior mesenteric artery denervation (SMADN) treatment. (14)Subjects with a history of allergy to iodinated contrast agents. (15)Subjects with an estimated glomerular filtration rate (eGFR) <30 mL/min/1.73m2. (16)Subjects diagnosed with an active infection. (17)Subjects diagnosed with an uncontrolled bleeding tendency. (18)Subjects who are pregnant, planning to become pregnant during the study period, or unwilling to use contraception during the study period. (19)Subjects deemed inappropriate for participationby the principal investigator or sub-investigator.