What question did this study set out to answer?

To determine the in vivo dynamic behavior, geometry, and mechanical adaptations of the thoracic aorta in freely moving rats during the development and chronic maintenance of renal hypertension across aging.

July 1, 1997AJP Heart and Circulatory Physiology

In vivo adaptive responses of the aorta to hypertension and aging

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Population

Renal hypertensive (Goldblatt 1 kidney, 1 clip) rats aged 3, 6, and 9 months

Comparison

Maintenance of hypertension for 1, 3, and 6 months vs Age-matched normotensive rats

Design

Preclinical

Follow-up

1, 3, and 6 months

Authors

MSMarie SumitaniUniversidade Federal de Minas Gerais ACA. M. CabralUniversidade Federal de Pernambuco LMLisete Compagno MicheliniPreventive Cardiology

Discussion

Member takes

Implication

Rat aortic adaptations to sustained hypertension warrant no clinical practice change; extends mechanistic understanding but leaves translational relevance open.

Key Points

To determine the in vivo dynamic behavior, geometry, and mechanical adaptations of the thoracic aorta in freely moving rats during the development and chronic maintenance of renal hypertension across aging.
Assessed renal hypertensive (Goldblatt 1 kidney, 1 clip) rats at 3, 6, and 9 months of age with established hypertension maintained for 1, 3, and 6 months, respectively, compared to age-matched normotensive controls.
Implanted chronic electrolytic strain gauges to record pulsatile thoracic aortic caliber simultaneously with aortic blood pressure during basal states and transient pressure shifts, followed by postmortem morphometric wall thickness analysis.
Induction of hypertension (179 ± 5 mmHg) increased resting caliber by 20%, wall thickness by 21%, and strain by 95%, with chronic maintenance for 6 months inducing a further 58% increase in wall thickness compared to normotensive controls.
Dynamic stress-strain relationships remained equivalent across normotensive and hypertensive groups (aside from a transient distensibility increase at 6 months), revealing that aortic geometric remodeling preserves distensibility and compliance to offset stiffening in peripheral arteries.

Structured PICO

Population

Renal hypertensive (Goldblatt 1 kidney, 1 clip) rats aged 3, 6, and 9 months

Intervention

Maintenance of hypertension for 1, 3, and 6 months

Comparator

Age-matched normotensive rats

Outcome

Pulsatile caliber of the thoracic aorta, aortic pressure, aortic thickness, and stress-strain relationshipsurrogate

In a rat model, the aorta adapts to hypertension by increasing thickness to maintain compliance and a near-constant distensibility, counterbalancing peripheral arterial changes.

Cite This Study

Sumitani et al. (1997) studied this question.

synapsesocial.com/papers/6a854063f14ace264a43d605 https://doi.org/10.1152/ajpheart.1997.273.1.h96

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Implication

Rat aortic adaptations to sustained hypertension warrant no clinical practice change; extends mechanistic understanding but leaves translational relevance open.

In vivo adaptive responses of the aorta to hypertension and aging

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

In vivo adaptive responses of the aorta to hypertension and aging

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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Also Consider