What does this research mean for the field?

Chronically decreased aortic distensibility reduces the coronary flow reserve ratio and impairs endocardial blood flow during increased ventricular contraction, inducing subendocardial ischemia without coronary stenosis. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To determine whether chronically reduced aortic distensibility impairs coronary artery flow and transmural blood distribution during elevated left ventricular contraction.

September 19, 2026Journal of the American College of CardiologyOpen Access

Chronically decreased aortic distensibility causes deterioration of coronary perfusion during increased left ventricular contraction

Q: What are the key findings of this study?

Chronically decreased aortic distensibility reduced the coronary flow reserve ratio during increased ventricular contraction compared to controls (1.9 vs 2.4, p<0.05).

Q: What is the clinical evidence from this study?

Study design: Other. Population: Decreased aortic distensibility (n=12). Intervention: Decreased aortic distensibility (banding the descending aorta) vs. Normal aorta. Primary outcome: Coronary flow reserve ratio during isoproterenol infusion (p=<0.05).

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Key result

Chronically decreased aortic distensibility lowers coronary flow reserve ratio by ~21% during increased ventricular contraction.

P<0.05
n=12

Why the study?

The long-term effects of decreased aortic distensibility on coronary perfusion have not been fully investigated.

Comparison

Normal aorta vs decreased aortic distensibility by descending aorta banding

Design

Experimental study with thoracotomy and coronary flow measurements

Follow-up

4 to 6 weeks

Authors

SOSadanori OhtsukaUniversity of Tsukuba MKMasaaki KakihanaTsukuba Memorial Hospital HWHideki WatanabeJichi Medical University

Discussion

Member takes

Implication

Aortic stiffening may impair subendocardial perfusion during stress; hypothesis-generating in animal models and requires human validation.

Key Points

To determine whether chronically reduced aortic distensibility impairs coronary artery flow and transmural blood distribution during elevated left ventricular contraction.
Twelve anesthetized dogs were allocated into a control group (n = 6) or a stiffened aorta group (n = 6) created by banding the descending aorta.
Following a 4- to 6-week period, coronary artery flow, transmural flow distribution, and subendocardial electrocardiographic tracings were evaluated at baseline and during isoproterenol infusion.
During isoproterenol infusion, the coronary flow reserve ratio decreased significantly more in the banded aorta group than in controls (mean ± SD: 1.9 ± 0.4 vs. 2.4 ± 0.3, p < 0.05).
Endocardial-to-epicardial flow ratios were significantly reduced under isoproterenol in the banded group compared with controls (mean ± SD: 0.70 ± 0.18 vs. 0.99 ± 0.22, p < 0.05), coinciding with significant subendocardial ST-segment elevation (p < 0.05).

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Population

12 anesthetized dogs allocated to normal aorta or decreased aortic distensibility via banding, followed for 4 to 6 weeks.

Intervention / Comparator

Decreased aortic distensibility (banding the descending aorta) vs Normal aorta

Primary Outcome

Coronary flow reserve ratio during isoproterenol infusion, p=<0.05

Main Result

Absolute Event Rate: 1.9% vs 2.4%

p-value: p=<0.05

Cite This Study

Ohtsuka et al. (1994) studied Decreased aortic distensibility (n=12). Decreased aortic distensibility (banding the descending aorta) vs. Normal aorta was evaluated on Coronary flow reserve ratio during isoproterenol infusion (p=<0.05). Chronically decreased aortic distensibility reduced the coronary flow reserve ratio during increased ventricular contraction compared to controls (1.9 vs 2.4, p<0.05).

synapsesocial.com/papers/6aae52d6234a2bad59d2fe64 https://doi.org/10.1016/0735-1097(94)90127-9

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Implication

Aortic stiffening may impair subendocardial perfusion during stress; hypothesis-generating in animal models and requires human validation.

Chronically decreased aortic distensibility causes deterioration of coronary perfusion during increased left ventricular contraction

Discussion

Member takes

Implication

Key Points

PICO

Main Result

Cite This Study

Chronically decreased aortic distensibility causes deterioration of coronary perfusion during increased left ventricular contraction

Discussion

Member takes

Implication

Key Points

PICO

Main Result

Cite This Study

Also Consider

Also Consider