Effects of inorganic nitrite on cardiac and skeletal muscle
| ISRCTN | ISRCTN16356908 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN16356908 |
| Clinical Trials Information System (CTIS) | 2012-000788-26 |
| Protocol serial number | 13080 |
| Sponsor | Norfolk and Norwich University Hospital NHS Trust |
| Funder | Medical Research Council |
- Submission date
- 02/12/2015
- Registration date
- 02/12/2015
- Last edited
- 12/03/2018
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Circulatory System
Plain English summary of protocol
Background and study aims
Nitrate is a chemical which plays an important part in regulating blood pressure and blood flow. Naturally, it is found in green leady vegetables and beetroot, although inorganic (man-made) supplements are becoming more common. Studies have shown that increased dietary intake of nitrates could prove to be beneficial for cardiovascular health (heart and blood vessels). In the body, nitrates are used by the cells that line the walls of blood vessels to produce the chemical nitric oxide (NO). NO causes the veins and arteries in the body to dilate, helping oxygen-rich blood to circulate around the body and to the heart. As more oxygen is carried around the body, the heart does not need to work as hard, which is particularly advantageous if someone is suffering from heart disease. Chronic heart failure (CHF) is a long-term condition where the heart has become weakened and isn’t able to pump blood around the body effectively. The aim of this study is to find out whether giving people suffering from CHF inorganic nitrate supplements could help to improve their condition.
Who can participate?
Adults who suffer from stable chronic (long-term) heart failure.
What does the study involve?
Participants are randomly allocated to one of two groups. Participants in the first group are given capsules containing inorganic sodium nitrate to take orally (by mouth) every day for 2 months. Participants in the second group are identical looking capsules containing a placebo (dummy) every day for 2 months. At the start of the study and then again after 1 week and 2 months, participants in both groups have the level of nitrate in their blood measured. Participants also complete questionnaires and physical tests to measure how well their heart is working when they exercise.
What are the possible benefits and risks of participating?
Not provided at time of registration
Where is the study run from?
Norfolk and Norwich University Hospital NHS Trust (UK)
When is the study starting and how long is it expected to run for?
April 2016 to April 2019
Who is funding the study?
Medical Research Council (UK)
Who is the main contact?
Professor Michael Frenneaux
Contact information
Scientific
University of Aberdeen
Polwarth Building
Foresterhill
Aberdeen
AB25 2ZD
United Kingdom
Study information
| Primary study design | Interventional |
|---|---|
| Study design | Single-centre randomised controlled trial |
| Secondary study design | Randomised controlled trial |
| Study type | Participant information sheet |
| Scientific title | The effects of inorganic nitrite on cardiac and skeletal muscle: Physiology, pharmacology and therapeutic potential in patients with chronic heart failure |
| Study objectives | Oral inorganic sodium nitrate supplementation will increase plasma levels of nitrite which will improve cardiac function and exercise capacity in association with an improvement in cardiac energy status compared to placebo. |
| Ethics approval(s) | Scotland A Research Ethics Committee, 08/05/2012, ref: 12/SS/0037 |
| Health condition(s) or problem(s) studied | Topic: Cardiovascular disease; Subtopic: Cardiovascular (all Subtopics); Disease: Heart Failure |
| Intervention | Participants are randomly allocated to one of two groups. Intervention group: Participants asked to take 7mmol inorganic sodium nitrate orally for two months Control group: Participants asked to take an identical placebo orally for two months |
| Intervention type | Other |
| Primary outcome measure(s) |
Peak VO2O2 consumption/workload relation during submaximal exercise at baseline and 2 months. |
| Key secondary outcome measure(s) |
1. Cardiac and skeletal muscle energetic status is measured using an MRI at baseline and 2 months |
| Completion date | 01/04/2019 |
Eligibility
| Participant type(s) | Patient |
|---|---|
| Age group | Adult |
| Lower age limit | 18 Years |
| Sex | All |
| Target sample size at registration | 56 |
| Key inclusion criteria | 1. Aged 18 years or over 2. Patients who suffer from symptomatic but stable chronic heart failure despite maximal tolerated contemporary medication, of non-ischaemic aetiology, in sinus rhythm |
| Key exclusion criteria | 1. Have been hospitalised for decompensated heart failure within the past three months. 2. Contra-indications for undergoing MRI. 3. Known G6PD deficiency or G6PD deficiency measured at screening in males of African, Asian or Mediterranean decent 4. Female subjects of childbearing potential 5. Valvular heart disease of moderate severity or greater 6. Predisposed to acute on chronic limb ischemia |
| Date of first enrolment | 30/11/2015 |
| Date of final enrolment | 01/02/2019 |
Locations
Countries of recruitment
- United Kingdom
- England
Study participating centre
Colney
Norwich
NR4 7UY
United Kingdom
Results and Publications
| Individual participant data (IPD) Intention to share | No |
|---|---|
| IPD sharing plan summary | Not provided at time of registration |
| IPD sharing plan |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| HRA research summary | 28/06/2023 | No | No | ||
| Participant information sheet | Participant information sheet | 11/11/2025 | 11/11/2025 | No | Yes |
Editorial Notes
The following updates were made:
1. The recruitment end date was changed from 28/02/2018 to 01/02/2019
2. The overall trial end date was changed from 28/02/2018 to 01/04/2019
