White Blood Cell Counts and Onset of Cardiovascular Diseases: a CALIBER Study (CALIBER)

December 12, 2013 updated by: University College, London

Leukocyte Counts and Initial Presentation of Cardiovascular Diseases: a CALIBER Study

The complete blood count is a commonly performed blood test, and previous small studies have suggested that the counts of some types of white blood cell in the complete blood count may be related to the onset of cardiovascular diseases such as stroke and heart attack. This is of interest because this information may help to predict strokes or heart attacks and may guide new therapies which act on white blood cells to reduce the risk of cardiovascular disease.

The hypothesis is that counts of particular types of white blood cell are associated with a range of cardiovascular diseases.

Study Overview

Status

Unknown

Conditions

Detailed Description

There is evidence from epidemiological studies that counts of some types of white blood cell, such as neutrophils, are associated with increased incidence of coronary disease. Associations with other initial presentations of cardiovascular diseases have not been studied in large cohorts, but may be of interest for use in risk prediction or to guide therapeutic strategies.

The aim of this study is to estimate associations between counts of lymphocytes, neutrophils, eosinophils, monocytes and basophils, and initial presentation of a range of cardiovascular diseases.

The study will use data from the CALIBER dataset of clinically collected electronic health record data from England. Patients enter the study when they have a full blood count (complete blood count) recorded in the dataset, and they are followed up until they experience one of the cardiovascular endpoints, death or transfer out of the participating primary care practice.

This study is part of the CALIBER (Cardiovascular disease research using linked bespoke studies and electronic records) programme funded over 5 years from the National Institute for Health Research (NIHR) and Wellcome Trust. The central theme of the CALIBER research is linkage of the Myocardial Ischaemia National Audit Project (MINAP) with primary care (Clinical Practice Research Datalink) and other resources. The overarching aim of CALIBER is to better understand the aetiology and prognosis of specific coronary phenotypes across a range of causal domains, particularly where electronic records provide a contribution beyond traditional studies. CALIBER has received both Ethics approval (ref 09/H0810/16) and ECC approval (ref ECC 2-06(b)/2009 CALIBER dataset).

Study Type

Observational

Enrollment (Anticipated)

800000

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

30 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Cohort study of patients in the CALIBER database who have a record of a full blood count (complete blood count) during the study period while registered at one of 225 general practices contributing data to CPRD (the Clinical Practice Research Datalink) and consenting to data linkage.

Description

Inclusion Criteria:

  • All patients aged 30 and over, registered with a participating general practice during the study period.

Exclusion Criteria:

  • Patients without a measurement of full blood count during the study period.
  • Patients with prior atherosclerotic disease, as recorded in primary care or hospitalisation data.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Initial presentation of cardiovascular disease
Time Frame: 10 years
First recorded diagnosis of cardiovascular disease during follow-up: ventricular arrhythmia / sudden cardiac death, heart failure, unheralded coronary death, myocardial infarction, unstable angina, stable angina, abdominal aortic aneurysm, peripheral arterial disease, subarachnoid haemorrhage, intracerebral haemorrhage, ischaemic stroke, transient ischaemic attack
10 years

Secondary Outcome Measures

Outcome Measure
Time Frame
All cause mortality
Time Frame: 10 years
10 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University College, London

Collaborators

London School of Hygiene and Tropical Medicine
Medical Research Council
Wellcome Trust
National Institute for Health Research, United Kingdom

Investigators

  • Principal Investigator: Anoop D Shah, MRCP, University College, London

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

January 1, 1997

Primary Completion (Anticipated)

December 1, 2013

Study Completion (Anticipated)

December 1, 2014

Study Registration Dates

First Submitted

December 12, 2013

First Submitted That Met QC Criteria

December 12, 2013

First Posted (Estimate)

December 18, 2013

Study Record Updates

Last Update Posted (Estimate)

December 18, 2013

Last Update Submitted That Met QC Criteria

December 12, 2013

Last Verified

December 1, 2013

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • CALIBER 13-15
  • RP-PG-0407-10314 (Other Grant/Funding Number: Wellcome Trust)
  • 086091/Z/08/Z (Other Grant/Funding Number: Wellcome Trust)
  • 0938/30/Z/10/Z (Other Grant/Funding Number: Wellcome Trust)

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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