What is the clinical evidence from this study?

Study design: Other. Population: SVT-induced cardiomyopathy (n=24). Intervention: Atrial pacing (SVT) vs. Sham control. Primary outcome: Left ventricular myocardial blood flow (LV-MBF) at rest (p=<0.05).

What question did this study set out to answer?

To explore the relationship between left ventricular function, myocardial blood flow, and capillary structure in tachycardia-induced cardiomyopathy.

July 1, 1991AJP Heart and Circulatory Physiology

Tachycardia-induced cardiomyopathy: effects on blood flow and capillary structure

Q: What are the key findings of this study?

Three weeks of rapid atrial pacing in pigs significantly reduced resting left ventricular myocardial blood flow compared to sham controls (0.8 vs 2.0 ml/min/g, P<0.05).

Q: What question did this study set out to answer?

To explore the relationship between left ventricular function, myocardial blood flow, and capillary structure in tachycardia-induced cardiomyopathy.

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Key result

Three weeks of rapid atrial pacing in pigs significantly reduced resting left ventricular myocardial blood flow compared to sham controls (0.8 vs 2.0 ml/min/g, P<0.05).

Why the study?

Does rapid atrial pacing-induced SVT alter myocardial blood flow and capillary structure in a porcine model?

Population

24 conscious pigs

Comparison

3 weeks of rapid atrial pacing to induce… vs Sham control

Design

Preclinical

Follow-up

3 weeks

Authors

FSFrancis G. SpinaleHeart Failure & Transplant JZJames L. ZellnerCHI Memorial Medical Group MTMasaaki TomitaYamagata Prefectural Institute of Public Health

Discussion

Member takes

Implication

Supports microvascular changes in SVT cardiomyopathy; leaves open clinical relevance and therapeutic targeting in patients.

Key Points

To explore the relationship between left ventricular function, myocardial blood flow, and capillary structure in tachycardia-induced cardiomyopathy.
Measured left ventricular function and myocardial blood flow in conscious pigs (n=16) between control and tachycardia groups.
Utilized echocardiography, catheterization, and microspheres for analysis.
Conducted measurements under different states: resting, rapid pacing, and adenosine infusion.
Left ventricular fractional shortening was lower and left atrial pressure higher in the SVT group compared to control (P<0.05).
Myocardial blood flow was significantly reduced in the SVT group at rest (0.8 ml.min-1.g-1) compared to controls (2.0 ml.min-1.g-1) (P<0.05).
Capillary density and structure metrics varied significantly between groups, suggesting alterations due to SVT.

Structured PICO

Does rapid atrial pacing-induced SVT alter myocardial blood flow and capillary structure in a porcine model?

Population

24 conscious pigs subjected to 3 weeks of atrial pacing or sham control to study SVT-induced cardiomyopathy.

Intervention

3 weeks of rapid atrial pacing (240 beats/min) to induce supraventricular tachycardia (SVT)

Comparator

Sham control

Outcome

Left ventricular function, myocardial blood flow (MBF), and capillary structuresurrogate

Main Result

Absolute Event Rate: 0.8% vs 2%

p-value: p=<0.05

Tachycardia-induced cardiomyopathy is associated with significantly reduced myocardial blood flow and impaired flow reserve in a porcine model.

Cite This Study

Spinale et al. (1991) studied SVT-induced cardiomyopathy (n=24). Atrial pacing (SVT) vs. Sham control was evaluated on Left ventricular myocardial blood flow (LV-MBF) at rest (p=<0.05). Three weeks of rapid atrial pacing in pigs significantly reduced resting left ventricular myocardial blood flow compared to sham controls (0.8 vs 2.0 ml/min/g, P<0.05).

synapsesocial.com/papers/6a699fb7a7344df3fa4805c6 https://doi.org/10.1152/ajpheart.1991.261.1.h140

Topics

Cardiomyopathy

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Tachycardia-induced cardiomyopathy: effects on blood flow and capillary structure

Discussion

Member takes

Implication

Key Points

Structured PICO

Main Result

Cite This Study

Topics

Tachycardia-induced cardiomyopathy: effects on blood flow and capillary structure

Discussion

Member takes

Implication

Key Points

Structured PICO

Main Result

Cite This Study

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Topics

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