Increased prevalence of silent myocardial ischaemia and severe ventricular arrhythmias in untreated patients with Alzheimer's disease and mild cognitive impairment without overt coronary artery disease

Roberto Zulli, Franco Nicosia, Barbara Borroni, Chiara Agosti, Paola Prometti, Paolo Donati, Massimiliano De Vecchi, Daniele Turini, Giuseppe Romanelli, Vittorio Grassi, Alessandro Padovani

Research output: Contribution to journalArticle

Abstract

Objective: To assess the prevalence and the characteristics of silent myocardial ischaemia (SMI) and ventricular arrhythmias (VA) in subjects with Alzheimer's disease (AD) and mild cognitive impairment (MCI) and their relationships with QT interval dispersion (QTD). Methods: Thirty-three subjects with AD, 39 subjects with MCI, and 29 cognitive healthy control subjects matched for demographic characteristics, hypertensive condition, smoking habits, and laboratory parameters were enrolled. Each subject underwent clinical and cognitive examination, a structural brain imaging study, electrocardiogram (ECG), 24-h ECG recording, 24-h blood pressure monitoring, and echocardiogram. Detection and characterization of QT dispersion, SMI and VA were performed. Results: The three groups were comparable regarding demographic and basal cardiovascular characteristics: notwithstanding this, SMI episodes were observed only in AD and MCI patients (19 and 14, respectively). A significantly greater prevalence of repetitive ventricular premature beats was observed in AD (mean 8.56 ± 13.1) and in MCI (1.8 ± 7.2) vs. control (0.7 ± 1.7). The QTD, the ischaemic burden and the number of repetitive ventricular beats revealed to be significantly related. Conclusions: Increased prevalence of SMI and potentially ominous VA were found in AD and, to a lesser extent, in MCI. SMI and repetitive VA were significantly related with QTD. These findings could be related to an increased risk of sudden cardiac death in AD and MCI patients.

Original languageEnglish
Pages (from-to)791-796
Number of pages6
JournalClinical Neurology and Neurosurgery
Volume110
Issue number8
DOIs
Publication statusPublished - Aug 2008

Keywords

  • Alzheimer's disease
  • Mild cognitive impairment
  • QT dispersion
  • Silent myocardial ischaemia
  • Ventricular arrhythmias

ASJC Scopus subject areas

  • Clinical Neurology
  • Surgery
  • Neurology

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