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Manaki V, Bontinis V, Bontinis A, Giannopoulos A, Kontes I, Chorti A, Ktenidis K. Aluminum potassium sulfate and tannic acid (ALTA) sclerotherapy for hemorrhoidal disease: a systematic review and meta-analysis. Acta Chir Belg 2024; 124:253-260. [PMID: 38428446 DOI: 10.1080/00015458.2024.2326273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Accepted: 02/28/2024] [Indexed: 03/03/2024]
Abstract
BACKGROUND We conducted a systematic review to assess the safety and efficacy of Aluminum potassium sulfate and tannic acid (ALTA) sclerotherapy for the treatment of hemorrhoidal disease. METHODS Our study was conducted in accordance with the PRISMA statement (Preferred Reporting Items for Systematic Reviews and Meta-analyses) 2020. Primary endpoints included overall recurrence and type of recurrence while secondary endpoints included postoperative complications, reintervention, presence of rectal ulcer, rectal stricture, defecation abnormalities and perianal abscess. Α regression analysis, where the percentage of patients with grade II, III and IV hemorrhoidal disease was used as a covariate, was also performed. RESULTS Twelve studies with 4249 patients met all the inclusion criteria and were eventually included. The crude and pooled estimates of the overall recurrence and complications by the end of follow-up were 10% (95% CI, 6.52%-14.08%) and 5.20% (95% CI, 2.59%-8.52%), respectively. Regression analysis displayed no correlation between recurrence and the grade of hemorrhoid disease II, β= -0.0012 (95% CI, -0.0074 to 0.0049) (p = .64), grade III β= -0.0006 (95% CI, -0.0056 to 0.0045) (p = .79) and grade IV β = 0.0025 (95% CI, -0.0075 to 0.0124). However, a trend suggestive of increased recurrence was observed in patient populations with a higher proportion of grade IV disease. CONCLUSION ALTA sclerotherapy may be a safe and viable alternative for patients with hemorrhoidal disease. Long-term follow-up and high-quality randomized controlled trials will help define the place of ALTA sclerotherapy in the armamentarium of treatment of hemorrhoids.
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Affiliation(s)
- Vasiliki Manaki
- Department of Vascular Surgery, Aristotle University of Thessaloniki, AHEPA University General Hospital, Thessaloniki, Greece
| | - Vangelis Bontinis
- Department of Vascular Surgery, Aristotle University of Thessaloniki, AHEPA University General Hospital, Thessaloniki, Greece
| | - Alkis Bontinis
- Department of Vascular Surgery, Aristotle University of Thessaloniki, AHEPA University General Hospital, Thessaloniki, Greece
| | - Argirios Giannopoulos
- Department of Vascular Surgery, Aristotle University of Thessaloniki, AHEPA University General Hospital, Thessaloniki, Greece
| | - Ioannis Kontes
- Department of Vascular Surgery, Aristotle University of Thessaloniki, AHEPA University General Hospital, Thessaloniki, Greece
| | - Angeliki Chorti
- Department of Surgery, Aristotle University of Thessaloniki, AHEPA University General Hospital, Thessaloniki, Greece
| | - Kiriakos Ktenidis
- Department of Vascular Surgery, Aristotle University of Thessaloniki, AHEPA University General Hospital, Thessaloniki, Greece
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Gallo G, Picciariello A, Armellin C, Lori E, Tomasicchio G, Di Tanna GL, Santoro GA, Alharbi M, Sorrenti S, Grossi U. Sclerotherapy for hemorrhoidal disease: systematic review and meta-analysis. Tech Coloproctol 2024; 28:28. [PMID: 38261136 PMCID: PMC10806988 DOI: 10.1007/s10151-023-02908-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 10/25/2023] [Indexed: 01/24/2024]
Abstract
BACKGROUND This systematic review and meta-analysis aimed to evaluate the safety and efficacy of sclerotherapy methods for hemorrhoidal disease (HD) over the past 40 years. METHODS The review followed the 2020 Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) guidelines. A comprehensive literature search was conducted, including studies reporting the use of sclerotherapy in patients with HD. Study eligibility criteria were defined, and data were extracted independently by the authors. Random-effects meta-analyses were performed to assess outcomes of interest. RESULTS Out of 1965 records identified, 44 studies met the inclusion criteria, involving 9729 patients. The majority of studies were conducted in Japan, followed by the UK, Italy, and Portugal. The median age of participants was 52 years, and the majority were male. The Goligher grade distribution indicated varying degrees of HD severity. Sclerotherapy was predominantly administered through anoscopy, with polidocanol being the most commonly used agent. The procedure was generally performed without pre-injection analgesia. The meta-analysis of 14 randomized controlled trials (RCTs) revealed that sclerotherapy was not inferior to control interventions in terms of success rate (risk ratio [RR] 1.00, 95% CI 0.71-1.41) and recurrence rate (RR 1.11, 95% CI 0.69-1.77), while resulting in fewer complications (RR 0.46, 95% CI 0.23-0.92). CONCLUSIONS This systematic review highlights the safety and efficacy of sclerotherapy for HD, which yields similar success rates and fewer complications compared to other conservative or surgical approaches. Further research is warranted to optimize sclerotherapy techniques and evaluate long-term outcomes. REGISTRATION PROSPERO 2023 CRD42023396910.
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Affiliation(s)
- G Gallo
- Department of Surgery, Sapienza University of Rome, Rome, Italy.
| | - A Picciariello
- Department of Experimental Medicine, University of Salento, Lecce, Italy
| | - C Armellin
- Department of Surgery, Oncology and Gastroenterology - DISCOG, University of Padua, Padua, Italy
| | - E Lori
- Department of Surgery, Sapienza University of Rome, Rome, Italy
| | - G Tomasicchio
- Department of Experimental Medicine, University of Salento, Lecce, Italy
| | - G L Di Tanna
- Department of Business Economics, Health and Social Care, SUPSI - University of Applied Sciences and Arts of Southern Switzerland, Viganello-Lugano, Switzerland
| | - G A Santoro
- Department of Surgery, Oncology and Gastroenterology - DISCOG, University of Padua, Padua, Italy
| | - M Alharbi
- Imam Mohammad Ibn Saud Islamic University, Riyadh, Saudi Arabia
| | - S Sorrenti
- Department of Surgery, Sapienza University of Rome, Rome, Italy
| | - U Grossi
- Department of Surgery, Oncology and Gastroenterology - DISCOG, University of Padua, Padua, Italy.
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Kondo H, Nakagawa R, Yamamoto T, Yamaguchi S. Aluminum potassium sulfate and tannic acid (ALTA) sclerotherapy complicating laparoscopic low anterior resection of rectal cancer: Case report. Int J Surg Case Rep 2022; 98:107543. [PMID: 36055169 PMCID: PMC9482925 DOI: 10.1016/j.ijscr.2022.107543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 08/19/2022] [Accepted: 08/19/2022] [Indexed: 11/09/2022] Open
Abstract
Introduction Aluminum potassium sulfate and tannic acid (ALTA) sclerotherapy is increasingly popular for treating internal hemorrhoids. This injectable compound incites inflammation to dampen hemorrhoidal blood flow and inflict secondary fibrosis. Herein, we detail the implications of ALTA treatment for laparoscopic low anterior resection of rectal cancer. Patient presentation A 72-year-old man receiving ALTA sclerotherapy for internal hemorrhoids thereafter required laparoscopic low anterior resection for newly discovered early rectal cancer. Observed changes of anal canal resembled those of radiochemotherapy and proved problematic. There was mural thickening and sclerosis at the planned resection site. To ensure proper removal, the bowel was compressed and stapled slowly. A two-shot resection took place (without straining), anastomosis was performed, and a covering stoma was constructed. Recovery was uneventful, allowing discharge on postoperative Day 10. The ileostomy was closed at a later time. Discussion Although little information is available on long-term rectal pathology after ALTA therapy, existing data suggest that sclerosis persists well beyond injection timeframes. Hence, caution is required in dissecting and debriding sclerotic remnants. We have identified only four earlier reports in this setting, the present case providing added perspective. Conclusion Colonoscopy is highly advisable prior to ALTA therapy. A thorough work-up before rectal surgery is also essential, documenting any past treatments for anorectal disease, especially ALTA. Rectal surgery after ALTA therapy requires caution due to mural thickening. ALTA-induced tissue fibrosis is sustained for at least 5 years. Careful preoperative histories of prior anorectal treatments are essential. Colonoscopy is strongly recommended prior to treatment of anorectal disease.
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Abstract
Injection sclerotherapy for all grades of interhemorrhoids in various situations and co-morbidities has become popular method of treatment. Several types of surgical operations both conventional and stapled hemorrhoidectomy has many and serious described side effects. On the contrary, proctoscopic injection sclerotherapy using some of the modern sclerosants and thin bore needle injections is an office-based ambulatory method of treatment of internal hemorrhoids; it is low in cost, devoid of any major complications besides it is quite successful as reported. Its safety and efficacy has been published in recent years. This manuscript is a result of thorough systemic review using PRISMA guidelines on various sclerosing agents, their merits and demerits, methods of administration, and outcome in internal hemorrhoids.
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Zhang FM, Wu KC, Li JN, Wang X, He XX, Wan R, Chen SY. Rationale, new anus positioning methods, and updated protocols: Expert recommendations on cap-assisted endoscopic sclerotherapy for hemorrhoids from China Gut Conference. Chin Med J (Engl) 2021; 134:2675-2677. [PMID: 34711720 PMCID: PMC8631410 DOI: 10.1097/cm9.0000000000001836] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Indexed: 02/07/2023] Open
Affiliation(s)
- Fa-Ming Zhang
- Medical Center for Digestive Diseases, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210011, China
| | - Kai-Chun Wu
- National Clinical Research Center for Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi 710032, China
| | - Jing-Nan Li
- Department of Gastroenterology, Peking Union Medical College Hospital, Beijing 100730, China
| | - Xin Wang
- National Clinical Research Center for Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi 710032, China
| | - Xing-Xiang He
- Department of Gastroenterology, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, Guangdong 510080, China
| | - Rong Wan
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Shi-Yao Chen
- Department of Gastroenterology and Hepatology, Zhongshan Hospital, Fudan University, Shanghai 200032, China
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Yoshimitsu M, Egi H, Kaneko M, Shimomura M, Hakoda K, Miguchi M, Kohashi T, Hihara J, Hirabayashi N, Ohdan H. Laparoscopic anterior resection for rectal stenosis caused by ALTA injection for internal hemorrhoids: A case report. Asian J Endosc Surg 2021; 14:271-274. [PMID: 32789974 DOI: 10.1111/ases.12849] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 04/09/2020] [Accepted: 07/08/2020] [Indexed: 12/25/2022]
Abstract
We herein report the first case of rectal stenosis that developed after internal hemorrhoid treatment with aluminum potassium sulfate and tannic acid (ALTA) therapy that was successfully treated by laparoscopic surgery. A 72-year-old man suffered from a fever and rectal stenosis after undergoing internal hemorrhoid treatment with a submucosal injection of ALTA at a previous clinic. Three months after ALTA therapy, he developed frequent mucous and bloody stools. Lower intestinal tract endoscopy revealed circumferential severe rectal stenosis. He was therefore referred to our hospital. The patient suffered from frequent stool build-up and difficulty defecating. We performed balloon-dilatation intervention. The stenosis was not improved at all. Five months after ALTA therapy, we performed laparoscopic low anterior resection with diverting ileostomy. Three months after the operation, ileostomy takedown was performed. The patient has experienced no rectal stenosis in the 2 years since his radical operation.
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Affiliation(s)
- Masanori Yoshimitsu
- Department of Surgery, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan
| | - Hiroyuki Egi
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Mayumi Kaneko
- Department of Pathology, Hiroshima City Asa Citizens Hospital, Hiroshima, Japan
| | - Manabu Shimomura
- Department of Surgery, Hiroshima City Asa Citizens Hospital, Hiroshima, Japan
| | - Keishi Hakoda
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Masashi Miguchi
- Department of Surgery, Hiroshima City Asa Citizens Hospital, Hiroshima, Japan
| | - Toshihiko Kohashi
- Department of Surgery, Hiroshima City Asa Citizens Hospital, Hiroshima, Japan
| | - Jun Hihara
- Department of Surgery, Hiroshima City Asa Citizens Hospital, Hiroshima, Japan
| | - Naoki Hirabayashi
- Department of Surgery, Hiroshima City Asa Citizens Hospital, Hiroshima, Japan
| | - Hideki Ohdan
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
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Abstract
Hemorrhoids are one of the most common diseases of the anorectal region. Previously, treatment for hemorrhoids included conservative treatment, outpatient treatment, and surgical treatment. The development of flexible reversible endoscopes has provided precise controllability and imaging, enabling further improvement and development of various endoscopic techniques to treat hemorrhoids. This article discusses several of these endoscopic techniques: rubber band ligation, sclerotherapy, and electrocoagulation. The development, efficacy, and advantages of these treatments are summarized and evaluated. It is expected that going forward, endoscopic technology will be further applied in clinical practice and may become the first-line method for the treatment of hemorrhoids.
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Yoshimitsu M, Egi H, Nagamatsu S, Shimomura M, Hakoda K, Miguchi M, Kohashi T, Okajima M, Ohdan H. Gluteal-fold flap repair of rectovaginal fistula caused by aluminum potassium sulfate hydrate-tannic acid injection for internal hemorrhoids: a case report. Surg Case Rep 2020; 6:166. [PMID: 32643046 PMCID: PMC7343680 DOI: 10.1186/s40792-020-00925-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Accepted: 06/25/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Rectovaginal fistula (RVF) following aluminum potassium sulfate hydrate-tannic acid (ALTA) injection therapy for hemorrhoids is a rare complication. We report the first case of RVF after ALTA injection therapy successfully treated by gluteal-fold flap. CASE PRESENTATION A 49-year-old female suffered from a fever and rectal ulcer after undergoing internal hemorrhoid treatment with a submucosal ALTA injection at a previous clinic. One week after ALTA therapy, she noted obvious passage of flatus and stool through the vagina, and was diagnosed with RVF by anoscope at another clinic. She was referred to our hospital 3 weeks after ALTA therapy. Sigmoid colostomy was performed for fecal diversion as a preliminary step for fistula repair. However, the fistula was scarred and the defect between the rectum and vagina did not improve at all. Ten months after ALTA therapy, we performed fistula repair by gluteal-fold flap. Seven months later, sigmoid-colostomy reversal was performed. The patient has experienced no RVF in the 3 years since sigmoid-colostomy reversal. CONCLUSIONS The gluteal-fold flap strategy is a useful option for severe RVF management.
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Affiliation(s)
- Masanori Yoshimitsu
- Department of Surgery, Hiroshima City Hiroshima Citizens Hospital, 7-33 Motomachi Naka-Ku, Hiroshima, 730-8518, Japan.
| | - Hiroyuki Egi
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Shogo Nagamatsu
- Department of Plastic Surgery, Hiroshima University, Hiroshima, Japan
| | - Manabu Shimomura
- Department of Surgery, Hiroshima City Asa Citizens Hospital, Hiroshima, Japan
| | - Keishi Hakoda
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Masashi Miguchi
- Department of Surgery, Hiroshima Prefectural Hospital, Hiroshima, Japan
| | - Toshihiko Kohashi
- Department of Surgery, Hiroshima City Asa Citizens Hospital, Hiroshima, Japan
| | - Masazumi Okajima
- Department of Surgery, Hiroshima City Hiroshima Citizens Hospital, 7-33 Motomachi Naka-Ku, Hiroshima, 730-8518, Japan
| | - Hideki Ohdan
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
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Wu X, Wen Q, Cui B, Liu Y, Zhong M, Yuan Y, Wu L, Zhang X, Hu Y, Lv M, Wu Q, He S, Jin Y, Tian S, Wan R, Wang X, Xu L, Bai J, Huang G, Ji G, Zhang F. Cap-assisted endoscopic sclerotherapy for internal hemorrhoids: technique protocol and study design for a multi-center randomized controlled trial. Ther Adv Gastrointest Endosc 2020; 13:2631774520925636. [PMID: 32551439 PMCID: PMC7278306 DOI: 10.1177/2631774520925636] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 04/15/2020] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Cap-assisted endoscopic sclerotherapy is a new interventional therapy for internal hemorrhoids and rectal prolapse under colonoscopy. The proper length of the endoscopic injection needle is the core for performing cap-assisted endoscopic sclerotherapy well with more benefits and less complications. However, no data are currently available to guide endoscopists to consider the length of injection needle before cap-assisted endoscopic sclerotherapy. This study is designed to evaluate the efficacy and safety of cap-assisted endoscopic sclerotherapy with long or short injection needle in the treatment of internal hemorrhoids. METHODS This is a nationwide multi-center, prospective, single-blind and randomized controlled trial. Patients with grade I-II internal hemorrhoids who have failed to conservative treatments and grade III internal hemorrhoids who are not suitable for surgery or refuse surgery will be included. Participants will be randomized 1:1 into either long or short injection needle group. The primary outcome is the recurrence rate of internal hemorrhoids 24 weeks after cap-assisted endoscopic sclerotherapy. The secondary outcomes are as follows: (1) symptom severity score, (2) three-level EuroQoL five dimensions health scale scores, (3) occurrence of adverse events and severe adverse events, and (4) patients' attitudes toward cap-assisted endoscopic sclerotherapy. Data collection will be conducted before and during operation, the 1st day, 1st week, 2nd week, and 24th week after cap-assisted endoscopic sclerotherapy. DISCUSSION The outcome of this study is expected to provide a practical clinical protocol of cap-assisted endoscopic sclerotherapy for patients with internal hemorrhoids and promote the use of this new endoscopic technique. TRIAL REGISTRATION ClinicalTrials.gov, NCT03917056. Registered on 12 April 2019.
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Affiliation(s)
- Xia Wu
- Medical Center for Digestive Diseases, Second Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Quan Wen
- Medical Center for Digestive Diseases, Second Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Bota Cui
- Medical Center for Digestive Diseases, Second Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yafei Liu
- Medical Center for Digestive Diseases, Second Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Min Zhong
- Medical Center for Digestive Diseases, Second Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yu Yuan
- Department of Gastroenterology, First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, China
| | - Lihao Wu
- Department of Gastroenterology, First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, China
| | - Xiaoyin Zhang
- Department of Holistic Integrative Medicine, Third People’s Hospital of Shenzhen, Shenzhen, China
| | - Yunlian Hu
- Department of Gastroenterology, Hubei Provincial Hospital of Traditional Chinese Medicine, Wuhan, China
| | - Muhan Lv
- Department of Gastroenterology, Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Qianneng Wu
- Department of Gastroenterology, Hangzhou Xixi Hospital, Hangzhou, China
| | - Suyu He
- Fourth Department of the Digestive Disease Center, Suining Central Hospital, Suining, China
| | - Yan Jin
- Department of Gastroenterology, Affiliated Hospital of Wuxi No. 2 People’s Hospital of Nanjing Medical University, Wuxi, China
| | - Shuxin Tian
- Department of Gastroenterology, First Affiliated Hospital of Shihezi University Medical College, Shihezi, China
| | - Rong Wan
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xin Wang
- Department of Gastroenterology, Tangdu Hospital, Fourth Military Medical University, Xi’an, China
| | - Long Xu
- Department of Gastroenterology and Hepatology, Shenzhen University General Hospital, Shenzhen, China
| | - Jianling Bai
- Department of Biostatistics, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Guangming Huang
- Medical Center for Digestive Diseases, Second Affiliated Hospital of Nanjing Medical University, Nanjing, China; Key Lab of Holistic Integrative Enterology, Nanjing Medical University, Nanjing, China
| | - Guozhong Ji
- Medical Center for Digestive Diseases, Second Affiliated Hospital of Nanjing Medical University, Nanjing, China; Key Lab of Holistic Integrative Enterology, Nanjing Medical University, Nanjing, China
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Muguruma N, Takayama T. Endoscopic Sclerotherapy with Aluminum Potassium Sulfate and Tannic Acid: An Effective and Less Invasive Strategy for Internal Hemorrhoids. Clin Endosc 2019; 52:521-522. [PMID: 31722520 PMCID: PMC6900304 DOI: 10.5946/ce.2019.162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 09/09/2019] [Indexed: 01/28/2023] Open
Affiliation(s)
- Naoki Muguruma
- Department of Gastroenterology and Oncology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Tetsuji Takayama
- Department of Gastroenterology and Oncology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
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