• Jose Coelho-Lima, Joseph Westaby, and Mary N Sheppard.
• CRY Department of Cardiovascular Pathology, Molecular and Clinical Sciences Research Institute, St. George's University of London, London, UK; NIHR Academic Clinical Fellow, University of Cambridge, Cambridge, UK.
• Resuscitation. 2022 Jun 1; 175: 6-12.

BackgroundSudden arrhythmic death syndrome (SADS), defined as sudden cardiac death (SCD) with a morphologically normal heart, is an important cause of sudden death. Hypoperfusion due to cardiac arrest followed by successful cardiopulmonary resuscitation (CPR) may induce histologic changes that mimic pathologic conditions. Detailed characterisation of such features and whether they could confound SADS diagnosis are not described.MethodsRetrospective observational study analysing all consecutive cases of sudden death prospectively referred to a UK national cardiac pathology centre between 2017 and 2021. Cases showing hypoperfusion features were identified after review of clinical information and examination by expert cardiac pathologists.ResultsOut of 2,568 SCD cases, 126 (4.9%) were identified with hypoperfusion changes. Macroscopically, the commonest finding was left ventricular focal or diffuse subendocardial haemorrhage (13.5%). Microscopically, haemorrhage and contraction band necrosis (n = 50, 37.7%), subendocardial acute infarction (n = 44, 34.1%), interstitial mixed inflammatory cell infiltrates (n = 31, 24.9%), healing granulation tissue (n = 9, 7.1%) and subendocardial fibrosis (n = 1, 0.7%) were observed. These changes correlated to duration of survival following resuscitation. In a subcohort of 41 cases, autopsy pathologists misinterpreted such changes as ischaemic myocardial infarction (n = 7; 17%), myocarditis (n = 5; 12.1%), or other pathologies (n = 2; 4.8%) in 14 SADS cases.ConclusionWe provide a comprehensive characterisation of hypoperfusion-related changes in the heart following successful CPR with survival, which are time related. These features can lead to diagnostic confusion among pathologists but knowledge of history of resuscitation with survival should help with general and expert pathology assessment and improve SADS diagnostic yield, prompting genetic screening of decedents' relatives.Copyright © 2022 Elsevier B.V. All rights reserved.

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