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January 1, 1987Circulation

A new intracavitary probe for detecting the site of origin of ectopic ventricular beats during one cardiac cycle.

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Why the study?

Does a new intracavitary multielectrode probe accurately detect the site of origin of ectopic ventricular beats in a dog model?

Population

9 open-chest dogs (7 evaluated with an olive-shaped probe, 2 with a cylindrical probe)

Design

Preclinical

Authors

BTB TaccardiGAG ArisiEMEmilio Macchi

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Overview

Intracavitary mapping feasible in normal dog hearts; leaves open clinical validation for ventricular ectopy localization.

Key Points

  • This research aims to evaluate a new intracavitary probe for accurately detecting the site of ectopic ventricular beats.
  • Introduced an olive-shaped probe with 41 electrodes in 7 open-chest dogs via the left atrium.
  • Delivered electrical and mechanical stimuli at various sites in the left and right ventricles.
  • Mapped equipotential contour lines to assess potential minima corresponding to pacing sites.
  • Identified a clear potential minimum at the electrode facing the pacing site with specific timing for different stimulus types.
  • Demonstrated dual minima on contour maps with simultaneous stimulation at two closely spaced sites.
  • Equipotential and isochrone contour maps provided insight into the location and depth of ectopic beats.

Structured PICO

Does a new intracavitary multielectrode probe accurately detect the site of origin of ectopic ventricular beats in a dog model?

P
Population
9 open-chest dogs (7 evaluated with an olive-shaped probe, 2 with a cylindrical probe)
I
Intervention
Intracavitary multielectrode probe (olive-shaped 25 X 12 mm with 41 electrodes or cylindrical 40 X 3 mm) introduced into the left ventricle for on-line mapping of equipotential contour lines during electrical and mechanical stimulation
O
Outcome
Detection of the site of origin (location and intramural depth) of ectopic paced beatssurrogate

A novel intracavitary multielectrode probe can accurately identify the location and intramural depth of ectopic ventricular beats in a normal dog heart using equipotential contour mapping.

Cite This Study

Taccardi et al. (1987) studied this question.

synapsesocial.com/papers/6a211557b53a8ed4bd02b0b8https://doi.org/10.1161/01.cir.75.1.272
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