What question did this study set out to answer?

This study aims to evaluate how unilateral pulmonary artery obstruction affects circulatory dynamics in dogs with chronic atrial septal defects.

November 1, 1961Circulation Research

Effect of Unilateral Pulmonary Artery Obstruction on Circulatory Dynamics in Dogs with Chronic Atrial Septal Defects

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Population

Dogs (title specifies dogs with chronic atrial septal defects)

Comparison

Various physiological and hormonal stimuli vs Comparison of responses between femoral and…

Design

Preclinical

Authors

JMJohn C. McGiffUniversity of Tennessee Health Science Center DADOMIKGO M. AVIADOHospital of the University of Pennsylvania

Discussion

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Implication

Differential canine vascular reactivity warrants caution extrapolating to humans; leaves open regional control mechanisms in clinical hemodynamics.

Key Points

This study aims to evaluate how unilateral pulmonary artery obstruction affects circulatory dynamics in dogs with chronic atrial septal defects.
Simultaneous recording of venous flow in femoral and renal beds using a rotameter.
Assessment of regional resistances in response to various stimuli like occlusion and hormonal changes.
Measurement of vascular resistance changes during different physiological challenges.
Femoral resistance increased more than renal resistance during carotid occlusion and hypoxia (5% oxygen).
Levarterenol and angiotensin caused greater increases in renal resistance compared to femoral resistance.
Aortic constriction significantly reduced femoral resistance more than renal resistance.

Structured PICO

Population

Dogs (title specifies dogs with chronic atrial septal defects)

Intervention

Various physiological and hormonal stimuli (bilateral common carotid occlusion, hypoxia, levarterenol, angiotensin, bleeding, aortic constriction)

Comparator

Comparison of responses between femoral and renal vascular beds

Outcome

Changes in vascular resistance in femoral and renal bedssurrogate

In dogs, the femoral vascular bed is more reactive to baroreceptor and chemoreceptor stimuli, while the renal bed is more susceptible to hormonal stimuli.

Cite This Study

McGiff et al. (1961) studied this question.

synapsesocial.com/papers/6a75fcc47d7eb453cc707a93 https://doi.org/10.1161/01.res.9.6.1327

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Implication

Differential canine vascular reactivity warrants caution extrapolating to humans; leaves open regional control mechanisms in clinical hemodynamics.

Effect of Unilateral Pulmonary Artery Obstruction on Circulatory Dynamics in Dogs with Chronic Atrial Septal Defects

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Effect of Unilateral Pulmonary Artery Obstruction on Circulatory Dynamics in Dogs with Chronic Atrial Septal Defects

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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