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Swinging heart and vector alternans: signs of impending doom

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  • Contributors Each author has made a significant contribution in reviewing the literature, drafting and revising the manuscript. Each author has seen and approved the manuscript before submission.

  • Competing interests DHS receives royalties from his textbook, ‘The Pericardium: A Comprehensive Textbook (Fundamental and Clinical Cardiology)’.

  • Patient consent Obtained.

  • Ethics approval Saint Vincent Hospital.

  • Provenance and peer review Not commissioned; externally peer reviewed.