A Pilot Study for Randomized Controlled Trial on the Effect and Safety of Omitting Preoperative Alpha-adrenergic Blockade for Normotensive Pheochromocytoma

Pheochromocytoma and paraganglioma (PPGL) are rare neuroendocrine tumors originating from catecholamine producing chromaffin cells in the adrenal medulla and extra-adrenal paraganglia. The overall age-standardized incidence rate is 0.18 per 100,000 person-years in Korea.
The definitive treatment of PPGL is surgical excision of tumor. However, surgery is associated with a high risk of perioperative hemodynamic instability (HI). To avoid perioperative HI in patients diagnosed with PPGL, preoperative management including routine use of alpha blockade and volume expansion has been advocated by several guidelines.
While unstable hypertension and tachycardia should be controlled in patients with PPGL, there is controversial that all patients diagnosed with PPGL should undergo preoperative pharmacological treatment, especially alpha blockade. The most important risk of preoperative alpha blockade use is perioperative hypotension.
A recent study reported that patients diagnosed with PPGL postoperatively may have no further higher risk of intraoperative hypertension than those diagnosed preoperatively despite insufficient preoperatively management of PPGL.
Therefore, it is a very important to study the relationship between HI and preoperative alpha blockade in normotensive patients diagnosed with PPGL. The aim this study is to analyze the effect and safety of omitting preoperative alpha-adrenergic blockade for normotensive pheochromocytoma through a prospective randomized controlled trial. The patients is divided into two groups. The patients in control group take a phenoxybenzamine at least 2 to 5 weeks before surgery. The patients in case group do not take a phenoxybenzamine.
Primary outcome is to evaluate the percentage of time during surgery with systolic blood pressure more than 160mmHg or average blood pressure less than 60mmHg. And secondary outcomes are to evaluate hemodynamic instability in preoperative ward and postoperative ward.

Start Date18 Jan 2023

Sponsor / Collaborator

Seoul National University Hospital

NCT01379898 / CompletedPhase 4

Pheochromocytoma Randomised Study Comparing Adrenoreceptor Inhibiting Agents for Preoperative Treatment

* Rationale: The optimal preoperative medical management for patients with a pheochromocytoma is currently unknown. In particular, there is no agreement with respect to whether phenoxybenzamine or doxazosin is the optimal alfa-adrenoreceptor antagonist to be administered before surgical resection of a pheochromocytoma. We hypothesized that the competitive alfa1-antagonist doxazosin is superior to the non-competitive alfa1- and alfa2-antagonist phenoxybenzamine.
* Objective: comparing effects of preoperative treatment with either phenoxybenzamine or doxazosin on intraoperative hemodynamic control in patients undergoing surgical resection of a pheochromocytoma.
* Study design: Randomised controlled open-label trial.
* Study population: 18 - 55 yr old. Adult patients with a recently diagnosed benign pheochromocytoma.
* Intervention: Patients are randomised to receive oral treatment with either phenoxybenzamine or doxazosin preoperatively.
* Main study parameters/endpoints: The main study parameter is defined as the percentage of intraoperative time that blood pressure is outside the predefined target range after pretreatment with either phenoxybenzamine or doxazosin.
In this multicenter trial, we compare the effects of two commonly used drugs in patients being medically prepared for resection of a benign pheochromocytoma. Participants are not subjected to an experimental treatment of any kind, as we merely aim to describe in detail the perioperative course in general and, in particular, the intraoperative hemodynamic control in patients treated preoperatively with either phenoxybenzamine or doxazosin. A routine diagnostic work-up for pheochromocytoma will be performed in all participants. One extra blood sample (volume: 48,5 mL) is drawn before start of the study medication, and participants need to record their symptoms in a diary. In addition, patients who are pretreated in the outpatient clinic monitor their blood pressure and pulse rate at home with an automated device. Treatment with an alfa-adrenoreceptor antagonist is initiated at least 2 - 3 weeks prior to surgery. Patients who are admitted to the hospital for pretreatment with an alfa-adrenoreceptor antagonist have their blood pressure and pulse rate measured by the nursing staff. The final site visit is planned at 30 days after surgery, in line with current practice.

Start Date01 Dec 2011

Sponsor / Collaborator

University Medical Center Groningen

[+14]

CTRI/2011/09/002019 / RecruitingPhase 4IIT

Comparative study of pre-operative blockade using Phenoxybenzamine vs. Prazosin efficacy ( intra- and post-operative hemodynamic changes) and safety profile in Pheochromocytoma

Start Date27 Sep 2011

Sponsor / Collaborator

Sanjay Gandhi Post Graduate Institute of Medical Sciences

100 Clinical Results associated with Phenoxybenzamine Hydrochloride

100 Translational Medicine associated with Phenoxybenzamine Hydrochloride

100 Patents (Medical) associated with Phenoxybenzamine Hydrochloride

5,076

Literatures (Medical) associated with Phenoxybenzamine Hydrochloride

01 Feb 2025·Food Chemistry

Study on the foam properties of peanut oil body (POB)-based oil-in-water-in-oil (O/W/O) foamed emulsion gel: The key role played by the interface between the water phase and the outer oil phase

Article

Author: Meng, Zong ; Shi, Zhangyu ; Li, Kangyu

A novel POB-based O/W/O foamed emulsion gel was constructed. The mechanism by which POB strengthens the foamed emulsion gel was preliminarily explored by studying the microstructure and rheological properties, and the applications of POB in decoration and 3D printing were analyzed. The adsorption of POBs and their fragments might strengthen the interface between the water and internal oil phases, thereby increasing the yield stress of the system, which protected the O/W/O structure from being damaged during whipping, and formed a special foam structure where air-in-oil (A/O) structures and O/W/O structure coexist. Besides, adding POB promoted the overrun of the emulsion gel, and the maximum overrun rate was 68.6 %. Finally, POB-based O/W/O foamed emulsion gel exhibited good decoration and 3D printing performance and is expected to become a healthy and higher-quality foamed food in the future.

26 Jun 2024·Sexual Medicine Reviews

A comprehensive history of injection therapy for erectile dysfunction, 1982-2023

Review

Author: Goldstein, Irwin ; Lewis, Ronald ; Virag, Ronald ; Porst, Hartmut

AbstractIntroductionAlthough oral phosphodiesterase 5 inhibitors represent a first choice and long-term option for about half of all patients with erectile dysfunction (ED), self-injection therapy with vasoactive drugs remains a viable alternative for all those who are not reacting or cannot tolerate oral drug therapy. This current injection therapy has an interesting history beginning in 1982.ObjectivesTo provide a comprehensive history of self-injection therapy from the very beginnings in 1982 by contemporary witnesses and some members of the International Society for Sexual Medicine’s History Committee, a complete history of injection therapy is prepared from eyewitness accounts and review of the published literature on the subject, as well as an update of the current status of self-injection therapy.MethodsPublished data on injection therapy, as a diagnostic and therapeutic tool for ED, were reviewed thoroughly by PubMed and Medline research from 1982 until June 2023. Early pioneers and witnesses added firsthand details to this historical review. Therapeutic reports of injection therapy were reviewed, and results of side effects and complications were thoroughly reviewed.ResultsThe pioneers of the first hours were Ronal Virag (1982) for papaverine, Giles Brindley (1983) for cavernosal alpha-blockade (phentolamine and phenoxybenzamine), Adrian Zorgniotti (1985) for papaverine/phentolamine, and Ganesan Adaikan and N. Ishii (1986) for prostaglandin E1. Moxisylyte (thymoxamine) was originally marketed but later withdrawn. The most common side effect is priapism, with the greatest risk of this from papaverine, which has modified its use for therapy. Currently, prostaglandin E1 and trimixes continue to be the agents of choice for diagnostic and therapeutic use in ED. A recent agent is a mixture of a vasoactive intestinal polypeptide (aviptadil) and phentolamine.ConclusionsAfter 40 years, self-injection therapy represents the medication with the highest efficacy and reliability rates and remains a viable option for many couples with ED. The history of this therapy is rich.

23 Feb 2024·JCEM Case Reports

Small Incidental Pheochromocytoma Presenting With Normal or Borderline High 24-hour Urine Fractionated Metanephrines

Author: Yeo, Chin Pin ; Kwek, Kevin Jun Hong ; Ho, Bernard Chi Sern ; Kon, Yin Chian

AbstractA 73-year-old man was found to have a 2-cm lipid-poor right adrenal incidentaloma on computed tomography imaging for hematuria. Twenty-four-hour urine metanephrine was 1.1-fold elevated, then normal on repeat measurement. Paired with the second urine collection, plasma metanephrine measured by liquid chromatography tandem mass spectrometry after a 30-minute supine rest was 3.3-fold elevated. Plasma normetanephrine was 1.2-fold elevated. The 24-hour urine catecholamines and normetanephrine, measured twice, were normal. He received low-dose phenoxybenzamine and underwent successful resection of right pheochromocytoma. Postoperatively, both plasma metanephrine and normetanephrine levels normalized, using an age-appropriate upper reference limit for plasma normetanephrine. Patients who harbor small lipid-poor adrenal incidentalomas have a relatively high risk (>5%) of having pheochromocytoma, indistinguishable from adenomas or carcinomas on computed tomography scan. In such cases when 24-hour urine fractionated metanephrines are normal, plasma free metanephrines measured by liquid chromatography tandem mass spectrometry under optimal sampling conditions that are 2-fold or more elevated confirm the diagnosis of pheochromocytoma. Preoperative alpha blockade followed by surgical resection is then appropriate, rather than continued monitoring with repeat urine measurements.

100 Deals associated with Phenoxybenzamine Hydrochloride

External Link

KEGG	Wiki	ATC	Drug Bank
D00507	Phenoxybenzamine Hydrochloride	C04AX02	DB00925

R&D Status

10 top approved records.

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Indication	Country/Location	Organization	Date
Peripheral Vasospasm	CN	Suzhou Homesun Pharmaceutical Co. Ltd.	01 Jan 1987
Urinary Retention	CN	Suzhou Homesun Pharmaceutical Co. Ltd.	01 Jan 1987
Hypertension	US	Concordia Pharmaceuticals, Inc.	26 Jan 1953
Pheochromocytoma	US	Concordia Pharmaceuticals, Inc.	26 Jan 1953

Clinical Result

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Study	Phase	Population	Analyzed Enrollment	Group	Results	Evaluation	Publication Date


NCT00620945 (CTgov)	Not Applicable	Heart Defects, Congenital	87	Phenoxybenzamine (Phenoxybenzamine Treatment)	ebzuplooiv(xotngdxyzx) = zmzfzgfscj muovijiwnl (yeodkzhauc, eyklkgkdrg - mfuuyoslct) View more	-	20 Nov 2017
NCT00620945 (CTgov)	Not Applicable	Heart Defects, Congenital	87	Phenoxybenzamine (Phenoxybenzamine)	rugsdkyjik(abyvemfxfu) = ojkfnlaitx bbfikcbbkh (qvnmhgbhoa, swuasdsbms - ruptpdmvyt) View more	-	20 Nov 2017
NCT00569855 (CTgov)	Phase 2	Heart Diseases	785	phenoxybenzamine	kpcxglotoo(oxbtoxbsrg) = uhjtfbohyv wycwxojbbu (pugkftbxvf, oeyhciwbbx - kfbkicqcwb) View more	-	01 Mar 2011

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