Does time delay between the primary cardiac arrest and PCI affect outcome?

Area of Science:

• Cardiology
• Emergency Medicine
• Clinical Research

Background:

• ST-segment elevation acute myocardial infarction (STEMI) is a critical condition requiring timely intervention.
• Cardiac arrest (CA) due to ventricular fibrillation (VF) is a known complication, but its prognostic impact relative to percutaneous coronary intervention (PCI) timing is unclear.

Purpose of the Study:

• To evaluate the prognostic value of CA due to VF occurring before, during, or after PCI in STEMI patients.
• To compare the 30-day all-cause mortality rates across different CA timing groups.

Main Methods:

• Retrospective analysis of 448 STEMI patients, identifying 34 with primary CA due to VF and 6 with secondary CA.
• Patients with primary CA were stratified into three groups: before PCI, during PCI, and after PCI.
• 30-day all-cause mortality was the primary outcome measure.

Main Results:

• Overall mortality was significantly higher in patients with CA (primary: 35.3%, secondary: 50%) compared to those without CA (7.1%).
• For primary CA, mortality rates were 8.3% before PCI, 44.4% during PCI, and 75% after PCI (P=0.007).
• Prognosis worsened progressively with later occurrence of CA relative to PCI.

Conclusions:

• Primary CA in STEMI patients carries a poor prognosis, similar to secondary CA.
• The timing of CA occurrence is a critical factor influencing prognosis, with post-PCI CA being the most detrimental.
• Stratifying STEMI patients with primary CA based on the timing of CA can improve risk stratification.