The Role of Influenza as a Trigger for Acute Myocardial Infarction: a CALIBER Study

Completed

• Conditions: Myocardial Infarction; Influenza

• Registration Number: NCT01106196
• Lead Sponsor: University College, London

Brief Summary

The purpose of this study is to examine the incidence of acute myocardial infarction (MI) occurring after an influenza-like illness using linked primary care and disease registry databases.

Detailed Description

This study will measure the incidence ratio for MI occurring in time periods after presentation with an acute respiratory illness compared to baseline time periods using the self-controlled case series method, with reference to the timing of the influenza season (defined by national virological and clinical surveillance data). It will also validate accuracy and completeness of information on MI in the GPRD using linked anonymised data from both MINAP and Hospital Episode Statistics.

This study is part of the CALIBER (Cardiovascular disease research using linked bespoke studies and electronic records) programme funded over 5 years from the NIHR and Wellcome Trust. The central theme of the CALIBER research is linkage of the Myocardial Ischaemia National Audit Project (MINAP) with primary care (GPRD) 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 Timeline

• Study Start: 2010-04
• Study First Submitted: 2010-04-16
• Study First Submitted QC: 2010-04-16
• Study First Posted: 2010-04-19
• Primary Completion: 2012-10
• Study Completion: 2012-10
• Status Verified: 2014-12
• Last Update Submitted: 2014-12-01
• Last Update Posted: 2014-12-02

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 11208

Inclusion Criteria

• Participants must be registered with a GPRD 'up to standard' practice during the study period 01/01/1999-31/12/2008
• They must have a record of an incident myocardial infarction (defined by a Read codelist submitted to and agreed by GPRD) that occurs both within their registration and the study period
• They must have at least 6 months between their registration date and the date of the incident MI
• They must have accessed primary care on at least one occasion for a respiratory illness during the study period

Exclusion Criteria

• Not fulfilling above criteria

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Incidence ratio for acute MI	28 days	Incidence ratio for MI occurring in time periods after presentation to primary care with an acute respiratory illness compared to baseline time periods

Trial Locations

Locations (2)

University College London (UCL); 🇬🇧 London, United Kingdom

London School of Hygiene & Tropical Medicine; 🇬🇧 London, United Kingdom