What question did this study set out to answer?

The aim is to investigate how fatty acids impact alpha1-adrenergic reactivity in dorsal hand veins and the role of insulin in this interaction.

November 1, 1997Hypertension

Fatty Acids, Not Insulin, Modulate α1-Adrenergic Reactivity in Dorsal Hand Veins

View Full Paper

Ask AI

Bookmark

Why the study?

Does local hyperinsulinemia antagonize the alpha1-sensitizing action of elevated nonesterified fatty acids in dorsal hand veins of lean normal volunteers?

Population

6 lean normal volunteers

Comparison

Local hyperinsulinemia in dorsal hand veins with… vs Baseline/absence of local hyperinsulinemia or…

Design

Other

Authors

KSK StepniakowskiEmory University GLGang LüRuijin Hospital GMGregory D. MillerNational Defense University

Discussion

Member takes

Implication

NEFAs may increase vascular alpha1 sensitivity in obesity independent of insulin; hypothesis-generating for hypertension mechanisms.

Key Points

The aim is to investigate how fatty acids impact alpha1-adrenergic reactivity in dorsal hand veins and the role of insulin in this interaction.
Produced local hyperinsulinemia in dorsal hand veins of six lean normal volunteers.
Quantified changes in venous distensibility in response to phenylephrine with and without elevated NEFAs.
Measured responses to acetylcholine to assess endothelium-dependent dilation.
Raising NEFAs locally decreased the phenylephrine ED50 by twofold to threefold (P<.01).
Local hyperinsulinemia did not affect vascular alpha1-adrenergic sensitivity as shown by unchanged phenylephrine ED50.
Acetylcholine induced 60% to 80% relaxation of preconstricted veins (P<.01), indicating strong endothelium-dependent dilation.

Structured PICO

Does local hyperinsulinemia antagonize the alpha1-sensitizing action of elevated nonesterified fatty acids in dorsal hand veins of lean normal volunteers?

Population

6 lean normal volunteers

Intervention

Local hyperinsulinemia in dorsal hand veins with and without local elevation of nonesterified fatty acids (NEFAs)

Comparator

Baseline/absence of local hyperinsulinemia or elevated NEFAs

Outcome

Changes in venous distensibility in response to phenylephrine (phenylephrine ED50)surrogate

Elevated nonesterified fatty acids enhance vascular alpha1-adrenoceptor sensitivity, and this effect is not antagonized by insulin, suggesting NEFAs may contribute to increased vascular tone in obesity.

Cite This Study

Stepniakowski et al. (1997) studied this question.

synapsesocial.com/papers/6a213a9bc409cc61b1343c2f https://doi.org/10.1161/01.hyp.30.5.1150

View Full Paper

Ask AI

Bookmark

Fatty Acids, Not Insulin, Modulate α1-Adrenergic Reactivity in Dorsal Hand Veins

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Fatty Acids, Not Insulin, Modulate α1-Adrenergic Reactivity in Dorsal Hand Veins

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Also Consider