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Herz

, Volume 39, Issue 5, pp 586–592 | Cite as

Simplified detection of myocardial ischemia by seismocardiography

Differentiation between causes of altered myocardial function
  • M. Becker
  • A.B. Roehl
  • U. Siekmann
  • A. Koch
  • M. de la Fuente
  • R. Roissant
  • K. Radermacher
  • N. Marx
  • M. Hein
Original article

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.

Keywords

Seismocardiography Myocardial ischemia Fast Fourier transformation Myocardial function Detection 

Abbreviations and Acronyms

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

Vereinfachte Erkennung myokardialer Ischämie durch Seismokardiographie

Ursachendifferenzierung veränderter Myokardfunktion

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.

Schlüsselwörter

Seismokardiographie Myokardiale Ischämie Schnelle Fourier-Transformation Myokardfunktion Diagnostik 

Notes

Conflict of interest

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

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Copyright information

© Urban & Vogel 2013

Authors and Affiliations

  • M. Becker
    • 1
  • A.B. Roehl
    • 2
  • U. Siekmann
    • 2
  • A. Koch
    • 3
  • M. de la Fuente
    • 4
  • R. Roissant
    • 2
  • K. Radermacher
    • 4
  • N. Marx
    • 1
  • M. Hein
    • 2
  1. 1.Department of CardiologyMedizinische Klinik I, RWTH Aachen University HospitalAachenGermany
  2. 2.Department of AnesthesiologyRWTH Aachen University HospitalAachenGermany
  3. 3.German Naval Medical InstituteKielGermany
  4. 4.Medical Engineering, Helmholtz Institute for Biomedical EngineeringAachenGermany

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