C-reactive protein: a prognostic indicator for sudden cardiac death post-myocardial infarction

Area of Science:

• Cardiology
• Clinical Medicine
• Biomarkers

Background:

• Inflammation plays a recognized role in ischemic heart disease (IHD).
• Current guidelines for implantable cardioverter-defibrillator (ICD) implantation after acute coronary syndrome (ACS) primarily rely on left ventricular ejection fraction (<35%).

Observation:

• An elderly male with ST-elevation myocardial infarction (STEMI) developed unexplained, severely elevated C-reactive protein (CRP) levels post-primary percutaneous coronary intervention (pPCI).
• The patient subsequently experienced sudden cardiac death (SCD).
• Post-mortem examination revealed only old myocardial infarction, with no signs of re-stenosis or systemic inflammation.

Findings:

• The observed CRP levels were significantly higher than previously reported in IHD cases.
• This case highlights a potential discrepancy between current risk stratification tools and actual patient risk, as the patient would not have qualified for ICD implantation under existing criteria.

Implications:

• This case underscores the need to reconsider and potentially broaden the criteria for ICD prescription following ACS.
• C-reactive protein (CRP) should be investigated further as a potential predictive biomarker for sudden cardiac death risk in ACS patients.
• Integration of novel risk-stratification tools, including inflammatory markers like CRP, into clinical guidelines (e.g., NICE) is warranted.