Changes to trial information |
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Trial Information |
Trial description |
27/05/2025 |
amendment requirement |
To assess the impact of hyperuricemia on ED and the effect of allopurinol on this population either alone or with tadalafil; a phosphodiesterase type 5 inhibitor (PDE-5I). |
This study evaluates the effect of allopurinol alone versus allopurinol plus daily tadalafil 5 mg on cavernosal uric acid levels and erectile function in patients with vasculogenic erectile dysfunction (VED). It aims to explore whether localized biochemical improvement correlates with clinical recovery in patients with hyperuricemia-related ED.
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Trial Information |
Trial description |
05/06/2025 |
Request to provide more detailed summary by PACTR reviewers |
This study evaluates the effect of allopurinol alone versus allopurinol plus daily tadalafil 5 mg on cavernosal uric acid levels and erectile function in patients with vasculogenic erectile dysfunction (VED). It aims to explore whether localized biochemical improvement correlates with clinical recovery in patients with hyperuricemia-related ED.
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Erectile dysfunction (ED) is a common condition affecting men, often resulting from vascular and endothelial dysfunction. Emerging evidence suggests that hyperuricemia may contribute to endothelial impairment through oxidative stress and reduced nitric oxide bioavailability—mechanisms also implicated in ED. Allopurinol, a xanthine oxidase inhibitor, lowers uric acid levels and may improve endothelial function. Tadalafil, a phosphodiesterase-5 inhibitor, is a well-established treatment for ED. This study was prompted by the need to explore whether urate-lowering therapy (ULT), alone or combined with tadalafil, could improve erectile function in hyperuricemic patients. We investigated the effect of allopurinol alone versus its combination with tadalafil on cavernosal uric acid levels and erectile function scores in patients with vasculogenic ED.
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Trial Information |
Target no of participants |
27/05/2025 |
amendment requirement |
100 |
80 |
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Old Value
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Trial Information |
Target no of participants |
10/06/2025 |
Thank you so much for your comment however let me explain
the total number of participants is 80
60 patients
20 controls
the same 60 received 2 arms of interventions
first : allopurinol for 2 months
then
secondly: allpourinola + tadalafil for another 2 months
therefore the total number is 80
Intervention arm (patients with vasculogenic ED + hyperuricemia): 60
These participants received:
Allopurinol 100 mg daily for 2 months
Then Allopurinol 100 mg + Tadalafil 5 mg daily for 2 more months (same group)
Control group (healthy, no ED): 20
No intervention; served as baseline comparator |
80 |
60 |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Trial Information |
Target no of participants |
10/06/2025 |
Thank you so much for your comment however let me explain
the total number of participants is 80
60 patients
20 controls
the same 60 received 2 arms of interventions
first : allopurinol for 2 months
then
secondly: allpourinola + tadalafil for another 2 months
therefore the total number is 80
Intervention arm (patients with vasculogenic ED + hyperuricemia): 60
These participants received:
Allopurinol 100 mg daily for 2 months
Then Allopurinol 100 mg + Tadalafil 5 mg daily for 2 more months (same group)
Control group (healthy, no ED): 20
No intervention; served as baseline comparator |
60 |
80 |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Study Design |
Intervention assignment |
17/06/2025 |
The study used a before-and-after interventional design in a single cohort of 60 patients with vasculogenic ED and hyperuricemia. Participants received Allopurinol alone for 2 months, then the combination of Allopurinol + Tadalafil for another 2 months. A separate group of 20 healthy individuals served as a non-interventional comparator for baseline uric acid levels.
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Parallel: different groups receive different interventions at same time during study |
Single Group |
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Field Name
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Date
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Study Design |
Intervention assignment |
20/06/2025 |
PACTR Admin |
Single Group |
Factorial: participants randomly allocated to either no, one, some or all interventions simultaneously |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Eligibility |
Age group |
27/05/2025 |
amendment requirement |
Adult: 19 Year-44 Year, Middle Aged: 45 Year(s)-64 Year(s) |
Adult: 19 Year-44 Year, Middle Aged: 45 Year(s)-64 Year(s), Aged: 65+ Year(s) |
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Field Name
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Date
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Intervention |
Intervention List |
05/06/2025 |
Total participants: 80 Intervention arm (patients with vasculogenic ED + hyperuricemia): 60 These participants received: Allopurinol 100 mg daily for 2 months Then Allopurinol 100 mg + Tadalafil 5 mg daily for 2 more months (same group) Control group (healthy, no ED): 20 No intervention; served as baseline comparator |
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Experimental Group, Allopurinol and Tadalafil, Allopurinol 100 mg + Tadalafil 5 mg orally once daily, 2 months, Phase 2 (Combination Therapy Phase): The same patients subsequently received a combination of Allopurinol 100 mg + Tadalafil 5 mg orally once daily for an additional 2 months. Cavernosal and serum uric acid levels, as well as IIEF-5 scores, were again assessed after completion., 30, |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Intervention |
Intervention List |
17/06/2025 |
Thank you so much for your comment however let me explain the total number of participants is 80 60 patients 20 controls the same 60 received 2 arms of interventions first : allopurinol for 2 months then secondly: allpourinola + tadalafil for another 2 months therefore the total number is 80 Intervention arm (patients with vasculogenic ED + hyperuricemia): 60 These participants received: Allopurinol 100 mg daily for 2 months Then Allopurinol 100 mg + Tadalafil 5 mg daily for 2 more months (same group) Control group (healthy, no ED): 20 No intervention; served as baseline comparator |
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Experimental Group, Allopurinol , Allopurinol 100 mg once daily , 2 months , Phase 1 (Monotherapy Phase): Patients received Allopurinol 100 mg orally once daily for a duration of 2 months. Cavernosal and serum uric acid levels were measured before and after this phase, along with erectile function assessment using the International Index of Erectile Function (IIEF-5).
, 50, |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Intervention |
Intervention List |
05/06/2025 |
Total participants: 80 Intervention arm (patients with vasculogenic ED + hyperuricemia): 60 These participants received: Allopurinol 100 mg daily for 2 months Then Allopurinol 100 mg + Tadalafil 5 mg daily for 2 more months (same group) Control group (healthy, no ED): 20 No intervention; served as baseline comparator |
Experimental Group, Allopurinol , Allopurinol 100 mg once daily , 2 months , Phase 1 (Monotherapy Phase): Patients received Allopurinol 100 mg orally once daily for a duration of 2 months. Cavernosal and serum uric acid levels were measured before and after this phase, along with erectile function assessment using the International Index of Erectile Function (IIEF-5).
, 60, |
Experimental Group, Allopurinol , Allopurinol 100 mg once daily , 2 months , Phase 1 (Monotherapy Phase): Patients received Allopurinol 100 mg orally once daily for a duration of 2 months. Cavernosal and serum uric acid levels were measured before and after this phase, along with erectile function assessment using the International Index of Erectile Function (IIEF-5).
, 30, |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Intervention |
Intervention List |
05/06/2025 |
Total participants: 80 Intervention arm (patients with vasculogenic ED + hyperuricemia): 60 These participants received: Allopurinol 100 mg daily for 2 months Then Allopurinol 100 mg + Tadalafil 5 mg daily for 2 more months (same group) Control group (healthy, no ED): 20 No intervention; served as baseline comparator |
Experimental Group, Allopurinol , Allopurinol 100 mg once daily , 2 months , Phase 1 (Monotherapy Phase): Patients received Allopurinol 100 mg orally once daily for a duration of 2 months. Cavernosal and serum uric acid levels were measured before and after this phase, along with erectile function assessment using the International Index of Erectile Function (IIEF-5).
, 30, |
Experimental Group, Allopurinol , Allopurinol 100 mg once daily , 2 months , Phase 1 (Monotherapy Phase): Patients received Allopurinol 100 mg orally once daily for a duration of 2 months. Cavernosal and serum uric acid levels were measured before and after this phase, along with erectile function assessment using the International Index of Erectile Function (IIEF-5).
, 60, |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Intervention |
Intervention List |
10/06/2025 |
Thank you so much for your comment however let me explain the total number of participants is 80 60 patients 20 controls the same 60 received 2 arms of interventions first : allopurinol for 2 months then secondly: allpourinola + tadalafil for another 2 months therefore the total number is 80 Intervention arm (patients with vasculogenic ED + hyperuricemia): 60 These participants received: Allopurinol 100 mg daily for 2 months Then Allopurinol 100 mg + Tadalafil 5 mg daily for 2 more months (same group) Control group (healthy, no ED): 20 No intervention; served as baseline comparator |
Experimental Group, Allopurinol , Allopurinol 100 mg once daily , 2 months , Phase 1 (Monotherapy Phase): Patients received Allopurinol 100 mg orally once daily for a duration of 2 months. Cavernosal and serum uric acid levels were measured before and after this phase, along with erectile function assessment using the International Index of Erectile Function (IIEF-5).
, 60, |
Experimental Group, Allopurinol , Allopurinol 100 mg once daily , 2 months , Phase 1 (Monotherapy Phase): Patients received Allopurinol 100 mg orally once daily for a duration of 2 months. Cavernosal and serum uric acid levels were measured before and after this phase, along with erectile function assessment using the International Index of Erectile Function (IIEF-5).
, 40, |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Intervention |
Intervention List |
10/06/2025 |
Thank you so much for your comment however let me explain the total number of participants is 80 60 patients 20 controls the same 60 received 2 arms of interventions first : allopurinol for 2 months then secondly: allpourinola + tadalafil for another 2 months therefore the total number is 80 Intervention arm (patients with vasculogenic ED + hyperuricemia): 60 These participants received: Allopurinol 100 mg daily for 2 months Then Allopurinol 100 mg + Tadalafil 5 mg daily for 2 more months (same group) Control group (healthy, no ED): 20 No intervention; served as baseline comparator |
Experimental Group, Allopurinol , Allopurinol 100 mg once daily , 2 months , Phase 1 (Monotherapy Phase): Patients received Allopurinol 100 mg orally once daily for a duration of 2 months. Cavernosal and serum uric acid levels were measured before and after this phase, along with erectile function assessment using the International Index of Erectile Function (IIEF-5).
, 40, |
Experimental Group, Allopurinol , Allopurinol 100 mg once daily , 2 months , Phase 1 (Monotherapy Phase): Patients received Allopurinol 100 mg orally once daily for a duration of 2 months. Cavernosal and serum uric acid levels were measured before and after this phase, along with erectile function assessment using the International Index of Erectile Function (IIEF-5).
, 60, |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Intervention |
Intervention List |
17/06/2025 |
Thank you so much for your comment however let me explain the total number of participants is 80 60 patients 20 controls the same 60 received 2 arms of interventions first : allopurinol for 2 months then secondly: allpourinola + tadalafil for another 2 months therefore the total number is 80 Intervention arm (patients with vasculogenic ED + hyperuricemia): 60 These participants received: Allopurinol 100 mg daily for 2 months Then Allopurinol 100 mg + Tadalafil 5 mg daily for 2 more months (same group) Control group (healthy, no ED): 20 No intervention; served as baseline comparator |
Experimental Group, Allopurinol , Allopurinol 100 mg once daily , 2 months , Phase 1 (Monotherapy Phase): Patients received Allopurinol 100 mg orally once daily for a duration of 2 months. Cavernosal and serum uric acid levels were measured before and after this phase, along with erectile function assessment using the International Index of Erectile Function (IIEF-5).
, 50, |
Experimental Group, Allopurinol , Allopurinol 100 mg once daily , 2 months , Phase 1 (Monotherapy Phase): Patients received Allopurinol 100 mg orally once daily for a duration of 2 months. Cavernosal and serum uric acid levels were measured before and after this phase, along with erectile function assessment using the International Index of Erectile Function (IIEF-5).
, 60, |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Intervention |
Intervention List |
05/06/2025 |
Total participants: 80 Intervention arm (patients with vasculogenic ED + hyperuricemia): 60 These participants received: Allopurinol 100 mg daily for 2 months Then Allopurinol 100 mg + Tadalafil 5 mg daily for 2 more months (same group) Control group (healthy, no ED): 20 No intervention; served as baseline comparator |
Experimental Group, Allopurinol and Tadalafil, Allopurinol 100 mg + Tadalafil 5 mg orally once daily, 2 months, Phase 2 (Combination Therapy Phase): The same patients subsequently received a combination of Allopurinol 100 mg + Tadalafil 5 mg orally once daily for an additional 2 months. Cavernosal and serum uric acid levels, as well as IIEF-5 scores, were again assessed after completion., 30, |
Experimental Group, Allopurinol and Tadalafil, Allopurinol 100 mg + Tadalafil 5 mg orally once daily, 2 months, Phase 2 (Combination Therapy Phase): The same patients subsequently received a combination of Allopurinol 100 mg + Tadalafil 5 mg orally once daily for an additional 2 months. Cavernosal and serum uric acid levels, as well as IIEF-5 scores, were again assessed after completion., 60, |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Intervention |
Intervention List |
10/06/2025 |
Total participants: 80 Intervention arm (patients with vasculogenic ED + hyperuricemia): 60 These participants received: Allopurinol 100 mg daily for 2 months Then Allopurinol 100 mg + Tadalafil 5 mg daily for 2 more months (same group) Control group (healthy, no ED): 20 No intervention; served as baseline comparator |
Experimental Group, Allopurinol and Tadalafil, Allopurinol 100 mg + Tadalafil 5 mg orally once daily, 2 months, Phase 2 (Combination Therapy Phase): The same patients subsequently received a combination of Allopurinol 100 mg + Tadalafil 5 mg orally once daily for an additional 2 months. Cavernosal and serum uric acid levels, as well as IIEF-5 scores, were again assessed after completion., 60, |
Experimental Group, Allopurinol and Tadalafil, Allopurinol 100 mg + Tadalafil 5 mg orally once daily, 2 months, Phase 2 (Combination Therapy Phase): The same 60 patients subsequently received a combination of Allopurinol 100 mg + Tadalafil 5 mg orally once daily for an additional 2 months. Cavernosal and serum uric acid levels, as well as IIEF-5 scores, were again assessed after completion., 40, |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Intervention |
Intervention List |
10/06/2025 |
Thank you so much for your comment however let me explain the total number of participants is 80 60 patients 20 controls the same 60 received 2 arms of interventions first : allopurinol for 2 months then secondly: allpourinola + tadalafil for another 2 months therefore the total number is 80 Intervention arm (patients with vasculogenic ED + hyperuricemia): 60 These participants received: Allopurinol 100 mg daily for 2 months Then Allopurinol 100 mg + Tadalafil 5 mg daily for 2 more months (same group) Control group (healthy, no ED): 20 No intervention; served as baseline comparator |
Experimental Group, Allopurinol and Tadalafil, Allopurinol 100 mg + Tadalafil 5 mg orally once daily, 2 months, Phase 2 (Combination Therapy Phase): The same 60 patients subsequently received a combination of Allopurinol 100 mg + Tadalafil 5 mg orally once daily for an additional 2 months. Cavernosal and serum uric acid levels, as well as IIEF-5 scores, were again assessed after completion., 40, |
Experimental Group, Allopurinol and Tadalafil, Allopurinol 100 mg + Tadalafil 5 mg orally once daily, 2 months, Phase 2 (Combination Therapy Phase): The same 60 patients subsequently received a combination of Allopurinol 100 mg + Tadalafil 5 mg orally once daily for an additional 2 months. Cavernosal and serum uric acid levels, as well as IIEF-5 scores, were again assessed after completion., 60, |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Outcome |
OutCome List |
27/05/2025 |
amendment requirement |
Primary Outcome, Change in cavernosal uric acid levels from baseline to 2 months and 4 months
Change in IIEF-5 score, 2 months |
Primary Outcome, Change in cavernosal uric acid levels from baseline to 2 months and 4 months
Change in IIEF-5 score, baseline and at 2 months post-treatment |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Outcome |
OutCome List |
27/05/2025 |
amendment requirement |
Secondary Outcome, Penile duplex ultrasound parameters: PSV, EDV, RI
Correlation between UA levels and IIEF-5 scores, 2 months |
Secondary Outcome, Penile duplex ultrasound parameters: PSV, EDV, RI
Correlation between UA levels and IIEF-5 scores, baseline and 2 months post treatment |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Ethics |
Ethics List |
27/05/2025 |
its usually approved with no date stamping for all university protocols however that was the date |
TRUE, Al Azhar university Research ethics Commitee, Al Mokhaym Al Daem, Gameat Al Azhar,, Cairo, 11651, Egypt, , 13 Dec 2022, +201007212845, info@azhar.edu.eg, 34762_31910_4737.pdf |
TRUE, Al Azhar university Research ethics Commitee, Al Mokhaym Al Daem, Gameat Al Azhar,, Cairo, 11651, Egypt, , 13 Dec 2022, +201007212845, info@azhar.edu.eg, 34762_31910_4737.pdf |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Ethics |
Ethics List |
05/06/2025 |
PACTR reviewer request |
TRUE, Al Azhar university Research ethics Commitee, Al Mokhaym Al Daem, Gameat Al Azhar,, Cairo, 11651, Egypt, , 13 Dec 2022, +201007212845, info@azhar.edu.eg, 34762_31910_4737.pdf |
TRUE, Al Azhar university Research ethics Commitee, Al Mokhaym Al Daem, Gameat Al Azhar,, Cairo, 11651, Egypt, , 13 Dec 2022, +201007212845, info@azhar.edu.eg, 34762_31910_4737.pdf |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Funding Source |
FundingSources List |
27/05/2025 |
amendment required |
none, Al Mokhaym Al Daem, Gameat Al Azhar, , cairo, 11651, Egypt, Self Funded, |
Mosaab Ragab Khalil , Al Mokhaym Al Daem, Gameat Al Azhar, , cairo, 11651, Egypt, Self Funded, |
Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Reporting |
IPD description |
27/05/2025 |
amendment requirement |
Cavernosal and serum uric acid levels, IIEF-5 scores, penile duplex findings |
De-identified individual participant data (including baseline, intervention, and outcome measures) will be available upon reasonable request to qualified researchers for scientific purposes after publication of the main results.
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Section Name
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Field Name
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Date
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Reason
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Old Value
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Updated Value
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Reporting |
IPD-Sharing time frame |
27/05/2025 |
amendment requirement |
Available upon reasonable request after publication
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Within 6 months after study completion.
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