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29.10.2018 | Original | Ausgabe 12/2018

Intensive Care Medicine 12/2018

Unrecognised myocardial infarction and its relationship to outcome in critically ill patients with cardiovascular disease

Zeitschrift:
Intensive Care Medicine > Ausgabe 12/2018
Autoren:
Annemarie B. Docherty, Shirjel Alam, Anoop S. Shah, Alastair Moss, David E. Newby, Nicholas L. Mills, Simon J. Stanworth, Nazir I. Lone, Timothy S. Walsh, the TROPICCAL Investigators
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s00134-018-5425-0) contains supplementary material, which is available to authorized users.
TROPICCAL Investigators members details are given in the Acknowledgement section.

Abstract

Purpose

To establish the incidence of myocardial infarction (MI) in ICU patients with co-existing cardiovascular disease (CVD), and explore its association with long-term survival.

Methods

In a multi-centre prospective cohort study in 11 UK ICUs, we enrolled 273 critically ill patients with co-existing CVD. We measured troponin I (cTnI) with a high sensitivity assay for 10 days; ECGs were carried out daily for 5 days and analysed by blinded cardiologists for dynamic changes. Data were combined to diagnose myocardial ‘infarction’, ‘injury’ or ‘no injury’ according to the third universal definition of MI. Patients were followed-up for 6 months. Regression and mediation analyses were used to explore relationships between acute physiological derangements, MI, and mortality.

Results

cTnI was detected in all patients, with a rise/fall pattern consistent with an acute hit. In 73% of patients, this peaked on days 1–3 [median 114 ng/l (first, third quartiles: 27, 393)]. Serial ECGs indicated 24.2% (n = 66) of patients experienced MI, but > 95% were unrecognized by clinical teams. Type 2 MI was the most likely aetiology in all cases. A further 46.1% (n = 126) experienced injury (no ECG changes). Injury and MI were both associated with 6-month mortality (reference: no injury): OR injury 2.28 (95% CI 1.06–4.92, p = 0.035), OR MI 2.70 (95% CI 1.11–6.55, p = 0.028). Mediation analysis suggested MI partially mediated the relationship between acute physiological derangement and 6-month mortality (p = 0.002), suggesting a possible causal association.

Conclusions

Undiagnosed MI occurs in around a quarter of critically ill patients with co-existing CVD and is associated with lower long-term survival.

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