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Trial registered on ANZCTR

Registration number
Ethics application status
Date submitted
Date registered
Date last updated
Date data sharing statement initially provided
Type of registration
Prospectively registered

Titles & IDs
Public title
Gut flora profiling in people with cardiovascular disease
Scientific title
Microbiota Profile in Acute Coronary Syndrome
Secondary ID [1] 299879 0
Nil known
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
cardiovascular disease 315289 0
Condition category
Condition code
Cardiovascular 313590 313590 0 0
Coronary heart disease
Cardiovascular 313591 313591 0 0
Other cardiovascular diseases

Study type
Patient registry
Target follow-up duration
Target follow-up type
Description of intervention(s) / exposure
Acute coronary syndrome (ACS) is a set of symptoms, such as chest pain, nausea and
sweating, caused from decreased blood flow in the coronary arteries which supply
blood to the heart. It is the unstable form of cardiovascular disease (CVD). Chronic stable angina, on the other hand, has similar symptoms, but these symptoms ease with rest, unlike ACS. So, chronic stable angina is the stable form of this CVD.

The aim of this study is to profile the gut microbiome, from dental scrapings, saliva, blood and faecal samples in people with acute coronary syndrome, chronic stable angina and healthy individuals. This is important as many studies have established that normal people have a certain gut microbiome profile compared to people with cardiovascular disease. In addition to gut microbiome profiling, the information gathered from the results of this study may be beneficial in a clinical setting. Given the prevalence of cardiovascular disease and the large interest in the microbiome field, the findings of this study will allow a greater understanding of the role of the microbiome in cardiovascular disease, which will have important clinical implications. It may also facilitate the future development of different therapeutic strategies to target and/or change the microbiome, which will be explored through intervention studies.

Dental, stool, saliva and blood samples will be obtained in the hospital at baseline (time zero) and again at follow-up (6 months).
Intervention code [1] 316144 0
Not applicable
Comparator / control treatment
Healthy relatives of acute coronary syndrome and chronic stable angina groups will be recruited as healthy environmental controls.
Control group

Primary outcome [1] 322041 0
Stool microbiome as assessed by 16S rRNA gene sequencing analysis of stool sample
Timepoint [1] 322041 0
Stool sample provided at baseline (time zero) and 6 month follow-up.
Primary outcome [2] 322127 0
Plasma short-chain fatty acids (SFCAs) as assessed by GCMS of plasma samples
Timepoint [2] 322127 0
Plasma samples provided at baseline (time zero) and 6 month follow-up.
Secondary outcome [1] 377134 0
Medication usage as assessed by study-specific questionnaire
Timepoint [1] 377134 0
Study specific questionnaire completed at baseline (time zero).
Secondary outcome [2] 377434 0
Diet in relation to changes in gut microbiome as assessed by study-specific questionnaire
Timepoint [2] 377434 0
Study specific questionnaire completed at baseline (time zero).

Key inclusion criteria
Men and women between the age of 40– 80 years of age presenting to FSH with acute
coronary syndrome or chronic stable angina will be recruited for the study. Healthy family
members of patients will be invited to take part in the study and will act as environmental
controls and will be age matched where possible.
Inclusion criteria:
• The participant to present to FSH with acute coronary syndrome or chronic stable
• Healthy participants will be relatives of ACS patients and are defined as individuals
with no clinically relevant abnormalities identified by a detailed medical history, full
physical examination including blood pressure, heart rate, clinical lab tests from a
fasting blood sample
• Evidence of a personally signed and dated informed consent document indicating that
the participant has been informed of all pertinent aspects of the trial
• Willing and able to comply with study procedures, i.e. sample collection
Minimum age
40 Years
Maximum age
80 Years
Both males and females
Can healthy volunteers participate?
Key exclusion criteria
Participants will be excluded from the study:
• If there are circumstances that interfere with the participant’s ability to give informed
consent (e.g. diminished understanding, or proficiency in English language and an
interpreter unavailable)
• Participants taking probiotics, antibiotics or antivirals which may disrupt gut
microbiota environment, current or recent <3 months.
• Major chronic disease e.g. cancer or dementia
• Healthy participants will be excluded if they have a history of major chronic disease
(including cardiovascular disease, psychiatric illness, cancer, diabetes), BMI <18 or
>35 kg/m2, current or recent (<12 months) smoking, current or recent (<6 months)
significant weight loss or gain (>6% body weight), alcohol intake >280g p/week for
men and >210g p/week for women.
• Inability to comply with study procedure

Study design
Natural history
Defined population
Statistical methods / analysis
The primary outcome will be assessed from the stool and plasma samples collected for batch analysis at the completion of the study. All stool samples will undergo 16S rRNA analysis for microbiome profiling. DNA will be isolated from the sample using QIAamp Fast DNA Mini Kit and subsequent 16S rRNA gene sequencing performed using the MiSeq desktop sequencer (Illumina) with microbiome analysis conducted using SILVAngs pipeline data analysis and The R project for Statistical Computing (version 3.2.4), as previously described (Caparros-Martin et al, 2017). Analysis will include; multivariate analysis to determine diet clusters and gut community composition in response to the different diets, diversity indexes to determine the diversity and dominance of gut bacteria, microbial taxonomic composition by phylum and family, and Tax4Fun analysis, a prediction tool to infer the functional capabilities of the bacterial community. To investigate the functional significance of alterations in the microbiome patterns and gain insight into the mechanistic handle linking the microbiome coronary health axis, we will utilise virtual metagenomics and function software platforms. In addition, products of bacterial digestion including plasma and stool SCFAs, TMAO and BAs will be analysed using in house GCMS methods. In the final analysis, participants with ACS will be age matched with healthy controls.
Secondary outcomes will be associations with family history, medication use, diet and
clinical outcomes. These will be done using patient medical records and discharge notes, a
validated food frequency questionnaire to ascertain macro and micronutrient intake and
patient follow-up. All ACS patients will be followed up at 6 months when they present to the
Department of Cardiology, where updated information on medication use, blood pressure and clinical outcomes will be gathered, in addition to follow up dental, oral, blood and stool
samples for analysis of microbiota profile, SCFA, TMAO and BA. This will allow us to
determine if microbiota composition and functionality stabilises as the disease status

Recruitment status
Not yet recruiting
Date of first participant enrolment
Date of last participant enrolment
Date of last data collection
Sample size
Accrual to date
Recruitment in Australia
Recruitment state(s)
Recruitment hospital [1] 15279 0
Fiona Stanley Hospital - Murdoch
Recruitment postcode(s) [1] 28589 0
6150 - Murdoch

Funding & Sponsors
Funding source category [1] 304338 0
Other Collaborative groups
Name [1] 304338 0
Harry Perkins Institute of Medical Research
Address [1] 304338 0
Harry Perkins Institute of Medical Research
5 Robin Warren Dr, Murdoch WA 6150
Country [1] 304338 0
Primary sponsor type
Girish Dwivedi
Harry Perkins Institute of Medical Research
5 Robin Warren Dr, Murdoch WA 6150
Secondary sponsor category [1] 304586 0
Name [1] 304586 0
Natalie Ward
Address [1] 304586 0
Medical Research Foundation, Royal Perth Hospital
Rear 50 Murray Street, Perth, 6000
Western Australia
Country [1] 304586 0

Ethics approval
Ethics application status
Ethics committee name [1] 304789 0
South Metropolitan Health Service
Ethics committee address [1] 304789 0
14 Barry Marshall Parade, Murdoch WA 6150
Ethics committee country [1] 304789 0
Date submitted for ethics approval [1] 304789 0
Approval date [1] 304789 0
Ethics approval number [1] 304789 0

Brief summary
In this study we aim to collect dental, saliva, blood and stool samples to characterise the gut microbiome profile of individuals with cardiovascular disease, specifically acute coronary syndrome and chronic stable angina and compare their microbiome profile to that of healthy individuals. Individuals with cardiovascular disease will have an alteration in the composition and functionality of their gut microbiome compared to healthy individuals.
Trial website
Trial related presentations / publications
Public notes

Principal investigator
Name 98210 0
Prof Girish Dwivedi
Address 98210 0
Harry Perkins Institute of Medical Research
5 Robin Warren Dr, Murdoch WA 6150
Country 98210 0
Phone 98210 0
Fax 98210 0
Email 98210 0
Contact person for public queries
Name 98211 0
Ms Adilah Ahmad
Address 98211 0
Harry Perkins Institute of Medical Research
5 Robin Warren Dr, Murdoch WA 6150
Country 98211 0
Phone 98211 0
Fax 98211 0
Email 98211 0
Contact person for scientific queries
Name 98212 0
Ms Adilah Ahmad
Address 98212 0
Harry Perkins Institute of Medical Research
5 Robin Warren Dr, Murdoch WA 6150
Country 98212 0
Phone 98212 0
Fax 98212 0
Email 98212 0

Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
No/undecided IPD sharing reason/comment
Patient confidentiality and health care reasons
What supporting documents are/will be available?
Study protocol
Ethical approval
How or where can supporting documents be obtained?
Type [1] 5798 0
Study protocol
Citation [1] 5798 0
Link [1] 5798 0
Email [1] 5798 0
Other [1] 5798 0
Type [2] 5799 0
Ethical approval
Citation [2] 5799 0
Link [2] 5799 0
Email [2] 5799 0
Other [2] 5799 0
Summary results
No Results