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Simplified detection of myocardial ischemia by seismocardiography

Differentiation between causes of altered myocardial function

Vereinfachte Erkennung myokardialer Ischämie durch Seismokardiographie

Ursachendifferenzierung veränderter Myokardfunktion

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Abstract

Seismocardiography (SCG) is a noninvasive technique for recording cardiac vibrations. Changes in these waves have been correlated with chronic and acute alterations in myocardial function. This analysis is complex and clinical integration limited. The current study aimed to simplify the utilization of SCG by fast Fourier transformation for a reliable discrimination between different intra- and postoperative causes of hypotension (i.e., myocardial ischemia or hypovolemia). We operated on nine pigs and recorded SCG at baseline, at hypovolemia (occlusion of the inferior vena cava), and at ischemia (occlusion of the right coronary artery). In conclusion, SCG enables detection and differentiation of ischemia and hypovolemia as important causes of altered myocardial function during and after surgery. Thus, this simple and noninvasive diagnostic tool may be used intra- and postoperatively to identify patients at risk.

Zusammenfassung

Die Seismokardiographie (SCG) ist eine nichtinvasive Technik zur Aufzeichnung kardialer Vibrationen. Änderungen dieser aufgezeichneten Wellen wurden bereits mit zahlreichen chronischen und akuten myokardialen Zuständen korreliert. Die Analyse der SCG ist allerdings komplex und die klinische Anwendbarkeit damit limitiert. Die vorliegende Studie soll helfen, die Anwendung der SCG durch eine Fourier-Transformation zu vereinfachen und eine Differenzierung zwischen verschiedenen intra- und postoperativen Ursachen einer Hypotonie (z. B. myokardiale Ischämie oder Hypovolämie) zu ermöglichen. Wir haben 9 Schweine operiert und die SCG zu den Zeitpunkten Baseline, Hypovolämie (durch Verschluss der unteren V. cava) und Ischämie (durch Verschluss der rechten Kranzarterie) aufgenommen. Zusammenfassend ermöglicht die SCG eine Identifizierung und Differenzierung von Hypovolämie und myokardialer Ischämie als wesentliche Ursachen einer eingeschränkten myokardialen Funktion während und nach einer Operation. Daher ist diese einfache und nichtinvasive Methode gut geeignet, um intra- und postoperativ Risikopatienten zu identifizieren.

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Abbreviations

AO:

aortic valve opening

CTI:

cardiac time intervals

ECG:

electrocardiography

Hz:

Hertz

IVC:

inferior vena cava

LV:

left ventricular

RCA:

right coronary artery

RF:

diastolic early rapid filling

ROC:

receiver-operating characteristics

SCG:

seismocardiography

TEE:

transesophageal echocardiography

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Conflict of interest

On behalf of all authors, the corresponding author states that there are no conflicts of interest.

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Authors and Affiliations

  1. Department of Cardiology, Medizinische Klinik I, RWTH Aachen University Hospital, Pauwelsstr. 30, 52057, Aachen, Germany

    M. Becker FESC & N. Marx

  2. Department of Anesthesiology, RWTH Aachen University Hospital, Aachen, Germany

    A.B. Roehl, U. Siekmann, R. Roissant & M. Hein

  3. German Naval Medical Institute, Kiel, Germany

    A. Koch

  4. Medical Engineering, Helmholtz Institute for Biomedical Engineering, Aachen, Germany

    M. de la Fuente & K. Radermacher

Authors
  1. M. Becker FESC
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  2. A.B. Roehl
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  3. U. Siekmann
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  4. A. Koch
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  5. M. de la Fuente
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  6. R. Roissant
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  7. K. Radermacher
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  8. N. Marx
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  9. M. Hein
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Corresponding author

Correspondence to M. Becker FESC.

Additional information

M. Becker and A.B. Roehl contributed equally to this study.

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Becker, M., Roehl, A., Siekmann, U. et al. Simplified detection of myocardial ischemia by seismocardiography. Herz 39, 586–592 (2014). https://doi.org/10.1007/s00059-013-3851-x

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  • DOI: https://doi.org/10.1007/s00059-013-3851-x

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