What question did this study set out to answer?

This study aims to evaluate how different pacing sites affect regional contraction patterns in the left ventricle of dogs.

January 1, 1977The Tohoku Journal of Experimental MedicineOpen Access

Regional Contraction patterns of the Left Ventricle during Ventricular Pacing

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Population

10 mongrel dogs

Comparison

Electrical pacing from the inflow, outflow… vs Right atrial (RA) pacing

Design

Preclinical

Authors

KMKozui MiyazawaYamagata University TAToru AraiNHO Kinki Chuo Chest Medical Center KSKunio ShiratoJikei University School of Medicine

Discussion

Member takes

Implication

Highlights asynchrony severity in pacing models; hypothesis-generating for resynchronization optimization.

Key Points

This study aims to evaluate how different pacing sites affect regional contraction patterns in the left ventricle of dogs.
Used ten mongrel dogs to evaluate myocardial function during pacing from various ventricular sites.
Measured mechanical shortening of left ventricular segments using strain gauge arches.
Analyzed the relationship between contraction patterns and changes in aortic pressure during pacing.
RVA and LVA pacing caused initial contraction of the apical segment, while RVO and LVL pacing activated the lateral segment.
Asynchrony during pacing reduced cardiac performance, linked more to the degree of asynchrony than changes in regional tension.
Mean aortic pressure decreased with prolonged intervals between segment contractions during left ventricular pacing.

Structured PICO

Population

10 mongrel dogs

Intervention

Electrical pacing from the inflow (RVI), outflow tracts (RVO), and apex (RVA) of the right ventricle and apex (LVA) and lateral wall (LVL) of the left ventricle

Comparator

Right atrial (RA) pacing

Outcome

Regional myocardial function (mechanical shortening of epicardial segments of the apical and lateral walls of the left ventricle)surrogate

Ventricular pacing induces left ventricular asynchrony, which directly correlates with decreased cardiac performance in a canine model.

Cite This Study

Miyazawa et al. (1977) studied this question.

synapsesocial.com/papers/6a11ccff1d1aaf8555562fca https://doi.org/10.1620/tjem.122.167

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Regional Contraction patterns of the Left Ventricle during Ventricular Pacing

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Regional Contraction patterns of the Left Ventricle during Ventricular Pacing

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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