Hemorrhoidal Artery Embolization: Longitudinal Impact On Symptoms (HELIOS)
Internal Hemorrhoids · HAE
What this study involves
The registry says this study is recruiting. Individual locations may have different availability.
- Study type
- Interventional
- Phase
- Not applicable
- Age range
- 18 years - 90 years
- Sex eligible
- All sexes
- Healthy volunteers
- Not accepted
- Participants
- 22 Estimated
These are starting points, not an eligibility decision. The research team must review the full requirements.
About the research
Hemorrhoidal artery embolization (HAE) is a novel treatment for symptomatic internal hemorrhoids. HAE involves the deliberate blockage (embolization) of enlarged rectal or hemorrhoidal arteries leading to reduction of abnormal blood flow to the hemorrhoidal tissue. The aim of HAE is to the improve hemorrhoid related symptoms, especially bleeding. Initial reports of HAE have demonstrated that it both safe and effective. Following an initial clinic visit to determine trial candidacy, enrolled patients will be subsequently treated with HAE. Patients will be followed for a year with clinic follow-up visits at 1, 3, 6 and 12 months.
Read the full description
Hemorrhoidal artery embolization (HAE) is a novel treatment for symptomatic internal hemorrhoids. HAE involves the deliberate blockage (embolization) of enlarged rectal or hemorrhoidal arteries leading to reduction of abnormal blood flow to the hemorrhoidal tissue. The aim of HAE is to the improve hemorrhoid related symptoms, especially bleeding. Initial reports of HAE have demonstrated that it both safe and effective. However, the initial data is limited due to variations in embolization techniques, few studies with prospective long-term follow-up, and studies focusing on patients with only severe symptoms. Further research is needed to understand the specific long-term effectiveness of different embolization materials in a population that more accurately reflects the large number of patients with hemorrhoidal disease who would likely benefit from HAE. The proposed research project includes 22 patients with symptomatic internal hemorrhoids. Following an initial clinic visit to determine trial candidacy, enrolled patients will be subsequently treated with HAE. Patients will be followed for a year with clinic follow-up visits at 1, 3, 6 and 12 months.
Who may be able to participate?
The list below is the sponsor’s full registry wording. It can include conditions, prior treatment, test results and other requirements. A match in search does not mean you qualify.
Inclusion Criteria:
- Age 18 to 90 years
- Ability to give written informed consent and to comply with the follow-up visits
- Symptomatic hemorrhoidal disease with French Bleeding Score (FBS) of at least four out of nine
- Refusal of or contraindication to surgery
- Refusal of or contraindication to other minimally invasive hemorrhoid treatments
- Grade I to III hemorrhoids
- Previous anoscopy or colonoscopy demonstrating internal hemorrhoids within 1 year
- Supply of the CCR from either the SRA or MRA on intra-procedural angiogram prior to embolization
Exclusion Criteria:
- Asymptomatic patients
- Patients who ever had previous colorectal surgery
- Grade IV hemorrhoids
- Colorectal disease other than hemorrhoids that could result in bleeding
- Anatomic findings on CTA that would preclude successful embolization
- Contraindication to iodinated contrast
- Inability to give written informed consent
- Active infection or malignancy
- Recent (within 12 months) or active cigarette use
- History of inflammatory bowel disease
- Uncorrectable bleeding diathesis
- Presence of portal hypertension or rectal varices seen on pre-procedure CTA or anoscopy/colonoscopy
- No SRA or MRA supply to the CCR seen intra-procedural angiogram
Treatment, groups and participation
The registry may describe treatments and study duration without a complete visit calendar. Ask the study team for the exact schedule, procedures, risks, costs and alternatives. Keep your usual care plan unless your treating clinician tells you otherwise.
- Assignment
- Not applicable
- Masking
- No masking
Hemorrhoidal artery embolization
Patients in this arm will undergo hemorrhoidal artery embolization (HAE) for treatment of symptomatic internal hemorrhoids
Procedure: Hemorrhoidal artery embolization
Hemorrhoidal artery embolization PROCEDURE
Hemorrhoidal artery embolization (HAE) involves the deliberate blockage of enlarged rectal or hemorrhoidal arteries leading to reduction of abnormal blood flow to the hemorrhoidal tissue. The aim of HAE is to the improve symptoms related to internal hemorrhoids, especially bleeding.
What researchers are measuring
Outcome measures describe what is being studied. They are not proof that a treatment works.
Primary measures
Proportion of patients with decrease in bleeding related symptoms of internal hemorrhoids as defined as a two-point decrease in French Bleeding Score
Time frame: From baseline to 12 months post procedure
Not reported in this registry record.
Secondary measures
Proportion of technically successful HAE procedures
Time frame: From baseline to 12 months post procedure
Not reported in this registry record.
Change in non-bleeding related symptoms of internal hemorrhoids as measured by the Hemorrhoid Disease Symptom Score (HDSS)
Time frame: From baseline to 12 months post procedure
The Hemorrhoidal Disease Symptom Score (HHDS) is a widely used questionnaire used by health professionals to evaluate the condition of patients with hemorrhoids. It can be self-administered and asks patients to rate the frequency and intensity of five primary symptoms: pain, itching, bleeding, soiling, and prolapse. Each symptom is rated on a scale of 0 to 4, with 0 indicating no symptoms and 4 indicating the most severe symptoms. The total HDSS score ranges from 0 to 20, with higher scores indicating more severe hemorrhoidal disease.
Change in non-bleeding related symptoms of internal hemorrhoids as measured by the Short Health Scale-Hemorrhoidal Disease (SHSHD)
Time frame: From baseline to 12 months post procedure
The Short Health Scale-Hemorrhoidal Disease questionnaire is a validated tool used to assess the impact of hemorrhoidal disease on a patient's health-related quality of life. It can be self-administered and measures four key dimensions: symptom load, functional status, disease-specific worries, and general well-being. Each symptom is rated on a scale of 1 to 7, with 1 indicating no symptoms and 7 indicating the most severe symptoms. The total SHSHD score ranges from 4 to 28, with higher scores indicating more severe hemorrhoidal disease.
Change in pain related to as measured by the Visual Analog Scale (VAS)
Time frame: From baseline to 12 months post procedure
The Visual Analog Scale (VAS) is a validated commonly used pain score. The VAS ranges from 0 to 10, with higher scores indicated higher pain levels.
Change in concomitant hemorrhoid medical therapy
Time frame: From baseline to 12 months post procedure
Not reported in this registry record.
Level of patient satisfaction after HAE as determined by patient satisfaction questionnaire
Time frame: From baseline to 12 months post procedure
Patient satisfaction will be determined by a patient satisfaction questionnaire with the following four options: very satisfied, satisfied, a little satisfied, and unsatisfied
Proportion of patients requiring subsequent non-surgical internal hemorrhoid procedures
Time frame: From baseline to 12 months post procedure
Not reported in this registry record.
Proportion of patients requiring surgical management of their internal hemorrhoids
Time frame: From baseline to 12 months post procedure
Not reported in this registry record.
Review the complete result tables and limitations in the official record.
Open official results ↗Research locations (1)
The overall study status and a local site’s status can differ. Confirm that location’s availability before traveling.
1 locations
University of California, Los AngelesLos Angeles, California, United StatesRecruiting
Study team and timeline
- Lead sponsor
- University of California, Los Angeles
- Study start
- Aug 5, 2025 Actual
- Primary completion
- Sep 30, 2028 Estimated
- Study completion
- Sep 30, 2029 Estimated
- First posted
- Sep 18, 2025 Actual
- Last updated
- Nov 10, 2026 Actual
Official study contacts
Official study title
Hemorrhoidal Artery Embolization: Longitudinal Impact On Symptoms (HELIOS)
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Source: ClinicalTrials.gov API v2. Information is submitted by sponsors and investigators. NLM does not approve the safety or science of all listed studies. Registry disclaimer.
Retrieved: Nov 12, 2026 · Last registry update: Nov 10, 2026
