What does this research mean for the field?

Bariatric surgery restores the anticontractile activity of perivascular adipose tissue in severely obese patients at 6 months, driven by reduced local adipose inflammation and oxidative stress. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To investigate the impact of bariatric surgery on small artery contractile function and identify the local mechanisms mediated by perivascular adipose tissue.

May 9, 2013Journal of the American College of CardiologyOpen Access

Effects of Bariatric Surgery on Human Small Artery Function

Q: What are the key findings of this study?

Bariatric surgery restored the anticontractile activity of perivascular adipose tissue on small arteries in severely obese patients at 6 months post-surgery (p < 0.01).

Q: What is the clinical evidence from this study?

Study design: Observational. Population: Severe obesity (n=27). Intervention: Bariatric surgery (gastric bypass) vs. Baseline (pre-surgery) and lean healthy volunteers. Primary outcome: Anticontractile effect of perivascular adipose tissue (PVAT) on small artery contractility (p=<0.01).

View Full Paper

Ask AI

Bookmark

Key result

Bariatric surgery is linked to restored anticontractile activity of perivascular adipose tissue at 6 months.

P<0.01
n=27

Why the study?

Does bariatric surgery improve small artery perivascular adipose tissue anticontractile function in severely obese individuals?

Population

20 severely obese individuals awaiting gastric bypass surgery and 7 lean healthy volunteers.

Comparison

Bariatric surgery (gastric bypass method) vs Pre-surgery baseline and lean healthy volunteers

Design

Cohort

Follow-up

6 months

Authors

RAReza AghamohammadzadehUniversity Hospitals Sussex NHS Foundation Trust AGAdam GreensteinManchester Academic Health Science Centre RYRahul YadavTownsville Hospital

Discussion

Member takes

Implication

Bariatric surgery may restore vascular anticontractile mechanisms in obesity; leaves open effects on cardiovascular outcomes.

Key Points

To investigate the impact of bariatric surgery on small artery contractile function and identify the local mechanisms mediated by perivascular adipose tissue.
Small subcutaneous arteries and surrounding perivascular adipose tissue (PVAT) were biopsied from severely obese patients before (n = 20) and 6 months after bariatric surgery (n = 15), as well as from lean controls (n = 7).
Vessel contractile responses to cumulative doses of norepinephrine were analyzed in vitro using wire myography in segments with and without intact PVAT.
Tissue morphology, macrophage infiltration (CD68), TNF-α expression, and nitric oxide bioavailability were quantified alongside pharmacological rescues using superoxide dismutase, catalase, and adiponectin receptor 1 blockade.
The normal anticontractile effect of PVAT was absent in obese patients before surgery compared with healthy volunteers, but was fully restored 6 months post-surgery despite persistent severe obesity.
Pre-operative loss of PVAT anticontractile function was acutely reversed in vitro by incubation with superoxide dismutase and catalase.
Post-surgical functional recovery coincided with reduced PVAT macrophage infiltration, decreased TNF-α, improved systemic metabolic markers, and increased local bioavailability of nitric oxide and adiponectin.

Study Design

Type

Observational (n=27)

Structured PICO

Does bariatric surgery improve small artery perivascular adipose tissue anticontractile function in severely obese individuals?

Population

27 participants, including 20 severely obese patients awaiting gastric bypass surgery and 7 lean healthy volunteers, evaluated for small artery function before and 6 months after surgery.

Intervention

Bariatric surgery (gastric bypass method)

Comparator

Pre-surgery baseline (within-subject comparison) and lean healthy volunteers

Outcome

Small artery contractile function (anticontractile activity of perivascular adipose tissue) examined in vitro with wire myographysurrogate

Main Result

p-value: p=<0.01

Bariatric surgery reverses obesity-induced microvascular dysfunction by restoring the anticontractile properties of perivascular adipose tissue through reduced local inflammation and increased nitric oxide bioavailability.

Limitations

Did not monitor the level of exercise performed by the participants at baseline or after surgery.
Did not recruit participants losing weight as part of a calorie-controlled diet for comparison.
No 6-month follow-up biopsy on severely obese patients who received no intervention.
Only studied subcutaneous gluteal PVAT, which might not reflect other vascular territories.
Norepinephrine was the only contractile agent used.
Did not monitor the level of exercise performed by the participants at baseline or after surgery
Did not recruit participants losing weight as part of a calorie-controlled diet for comparison
No 6-month follow-up biopsy on severely obese patients who received no intervention
Studied only subcutaneous small arteries (gluteal PVAT) and not other anatomical sites
Norepinephrine was the only contractile agent used

Cite This Study

Aghamohammadzadeh et al. (2013) conducted an observational in Severe obesity (n=27). Bariatric surgery (gastric bypass) vs. Baseline (pre-surgery) and lean healthy volunteers was evaluated on Anticontractile effect of perivascular adipose tissue (PVAT) on small artery contractility (p=<0.01). Bariatric surgery restored the anticontractile activity of perivascular adipose tissue on small arteries in severely obese patients at 6 months post-surgery (p < 0.01).

synapsesocial.com/papers/6a18e38284137bd80e91db92 https://doi.org/10.1016/j.jacc.2013.04.027

View Full Paper

Ask AI

Bookmark

Effects of Bariatric Surgery on Human Small Artery Function

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Limitations

Cite This Study

Effects of Bariatric Surgery on Human Small Artery Function

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Limitations

Cite This Study

Also Consider

Also Consider