No registrations found.
ID
Source
Brief title
Health condition
cognition, EEG, vardenafil
cognitie, EEG, vardenafil
Sponsors and support
Intervention
Outcome measures
Primary outcome
The main outcome is the behavioural score on the memory tests; the verbal learning task (VLT), the spatial memory task (SMT) and the continuous recognition memory task (CRMT).
Secondary, the event-related potentials during those tasks will be analyzed.
Secondary outcome
Other important outcomes are the behavioural scores on the Tower of London (TOL) and the Stroop task. In addition, visual and auditory evoked potentials (respectively VEPs and AEPs), which will give an indication of the role of vardenafil in information processing are important measures as well. Finally, the ratio (S2/S1) of the P50 is a measure of sensory gating.
Background summary
Research on the neurobiological foundations of memory and learning has shown that phosphodiesterase inhibitors increase the level of cGMP (cyclic Guanosine Monophosphate), which plays a role in the induction of hippocampal long-term potentiation (LTP). This is thought to be an important mechanism of learning and memory. It has indeed been found that the administration of phosphodiesterase type 5 (PDE-5) inhibitors improves memory performance in rats. So far, only a few studies have examined the effects of PDE-5 inhibitors on cognition in humans. The results of these studies, in which the PDE-5 inhibitor sildenafil was used, have been quite contradictory. Therefore, we decided to use vardenafil which is a more selective PDE-5 inhibitor than sildenafil, and as a result, more potent and has fewer side effects.
The primary objective is to examine whether vardenafil (a PDE-5 inhibitor) can improve the cognition of healthy young volunteers.
Secondary, we will assess the effects of vardenafil on electrophysiological correlates of cognition.
18 healthy males and females between 18 and 35 years of age will participate. They will be recruited via advertisements at Maastricht University and in the Observant (university paper).
Furthermore, they will be selected out of a group of 40 subjects, based on their performance on a memory screening.
Participants will be treated with vardenafil 10 mg, vardenafil 20 mg, or a placebo. All treatments will be taken orally. The treatment order will be established by counterbalancing.
Study objective
We hypothesize that vardenafil improves cognition. This will be apparent as increased recall/recognition scores in a verbal and pictorial memory task, as well as percentage correct in a spatial memory paradigm.
Study design
- Three test days, which will be separated by a washout period of at least 7 days
Intervention
The study will be conducted according to a double-blind, placebo-controlled, 3-way cross-over design. Order of treatments (vardenafil 10 mg, vardenafil 20 mg and a placebo) will be balanced over three test days, which will be separated by a washout period of at least 7 days. The balancing of the treatment order will be accomplished by counterbalancing. There will be six different treatment orders, meaning that each order will be received by three participants.
Maastricht University
PO Box 616
Olga Reneerkens
Maastricht 6200 MD
The Netherlands
Maastricht University
PO Box 616
Olga Reneerkens
Maastricht 6200 MD
The Netherlands
Inclusion criteria
1. Volunteers who are male or female,
2. 18 to 35 years of age,
3. Healthy (i.e. absence of all exclusion criteria),
4. Normal static binocular acuity (corrected or uncorrected),
5. Body mass index between 18.5 and 30,
6. Willingness to sign an informed consent,
7. Positive evaluation on the screening.
Exclusion criteria
1. Excluded will be those volunteers who suffer from or have a history of cardiac, hepatic, renal, pulmonary, neurological, gastrointestinal, haematological or psychiatric illness.
2. Other exclusion criteria are excessive drinking (>20 glasses of alcohol containing beverages a week),
3. Pregnancy or lactation,
4. Use of medication other than oral contraceptives,
5. Use of recreational drugs from 2 weeks before until the end of the experiment,
6. Any sensory or motor deficits which could reasonably be expected to affect test performance.
7. Those volunteers who have a first-degree relative with a psychiatric disorder or a history of a psychiatric disorder will also be excluded.
Design
Recruitment
Followed up by the following (possibly more current) registration
No registrations found.
Other (possibly less up-to-date) registrations in this register
No registrations found.
In other registers
| Register | ID |
|---|---|
| NTR-new | NL1217 |
| NTR-old | NTR1262 |
| Other | MEC : 08-3-011 |
| ISRCTN | ISRCTN wordt niet meer aangevraagd |