scholarly journals ASIC1a does not play a role in evoking the metabolic component of the exercise pressor reflex in a rat model of peripheral artery disease

2020 ◽  
Vol 319 (1) ◽  
pp. H171-H182
Author(s):  
Guillaume P. Ducrocq ◽  
Joyce S. Kim ◽  
Juan A. Estrada ◽  
Marc P. Kaufman
Keyword(s):  
Quality Of Life ◽  
Peripheral Artery Disease ◽  
Rat Model ◽  
Peripheral Artery ◽  
Exercise Pressor Reflex ◽  
Metabolic Component ◽  
Pressor Reflex ◽  
Artery Disease

The role of ASIC1a in evoking the metabolic component of the exercise pressor reflex in peripheral artery disease is unknown. Using a within-rat experimental design, we found that the contribution of ASIC1a decreased in a rat model of peripheral artery disease. These results have key implications to help finding better treatments and improve morbidity, quality of life, and mortality in patients with peripheral artery disease.

scholarly journals Chronic femoral artery ligation exaggerates the pressor and sympathetic nerve responses during dynamic skeletal muscle stretch in decerebrate rats

2018 ◽  
Vol 314 (2) ◽  
pp. H246-H254 ◽  
Author(s):  
Evan A. Kempf ◽  
Korynne S. Rollins ◽  
Tyler D. Hopkins ◽  
Alec L. Butenas ◽  
Joseph M. Santin ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Peripheral Artery Disease ◽  
Sympathetic Nerve ◽  
Sympathetic Nerve Activity ◽  
Peripheral Artery ◽  
Nerve Activity ◽  
Exercise Pressor Reflex ◽  
Pressor Reflex ◽  
Artery Disease ◽  
Dynamic Stretch

Mechanical and metabolic signals arising during skeletal muscle contraction reflexly increase sympathetic nerve activity and blood pressure (i.e., the exercise pressor reflex). In a rat model of simulated peripheral artery disease in which a femoral artery is chronically (~72 h) ligated, the mechanically sensitive component of the exercise pressor reflex during 1-Hz dynamic contraction is exaggerated compared with that found in normal rats. Whether this is due to an enhanced acute sensitization of mechanoreceptors by metabolites produced during contraction or involves a chronic sensitization of mechanoreceptors is unknown. To investigate this issue, in decerebrate, unanesthetized rats, we tested the hypothesis that the increases in mean arterial blood pressure and renal sympathetic nerve activity during 1-Hz dynamic stretch are larger when evoked from a previously “ligated” hindlimb compared with those evoked from the contralateral “freely perfused” hindlimb. Dynamic stretch provided a mechanical stimulus in the absence of contraction-induced metabolite production that closely replicated the pattern of the mechanical stimulus present during dynamic contraction. We found that the increases in mean arterial blood pressure (freely perfused: 14 ± 1 and ligated: 23 ± 3 mmHg, P = 0.02) and renal sympathetic nerve activity were significantly greater during dynamic stretch of the ligated hindlimb compared with the increases during dynamic stretch of the freely perfused hindlimb. These findings suggest that the exaggerated mechanically sensitive component of the exercise pressor reflex found during dynamic muscle contraction in this rat model of simulated peripheral artery disease involves a chronic sensitizing effect of ligation on muscle mechanoreceptors and cannot be attributed solely to acute contraction-induced metabolite sensitization. NEW & NOTEWORTHY We found that the pressor and sympathetic nerve responses during dynamic stretch were exaggerated in rats with a ligated femoral artery (a model of peripheral artery disease). Our findings provide mechanistic insights into the exaggerated exercise pressor reflex in this model and may have important implications for peripheral artery disease patients.

scholarly journals Systemic and regional hemodynamic response to activation of the exercise pressor reflex in patients with peripheral artery disease

2020 ◽  
Vol 318 (4) ◽  
pp. H916-H924 ◽  
Author(s):  
Danielle Jin-Kwang Kim ◽  
Marcos Kuroki ◽  
Jian Cui ◽  
Zhaohui Gao ◽  
J. Carter Luck ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Peripheral Artery Disease ◽  
Plantar Flexion ◽  
Peripheral Artery ◽  
Exercise Pressor Reflex ◽  
Femoral Blood Flow ◽  
Femoral Blood ◽  
Pressor Reflex ◽  
Artery Disease

Patients with peripheral artery disease (PAD) have an accentuated exercise pressor reflex (EPR) during exercise of the affected limb. The underlying hemodynamic changes responsible for this, and its effect on blood flow to the exercising extremity, are unclear. We tested the hypothesis that the exaggerated EPR in PAD is mediated by an increase in total peripheral resistance (TPR), which augments redistribution of blood flow to the exercising limb. Twelve patients with PAD and 12 age- and sex-matched subjects without PAD performed dynamic plantar flexion (PF) using the most symptomatic leg at progressive workloads of 2–12 kg (increased by 1 kg/min until onset of fatigue). We measured heart rate, beat-by-beat blood pressure, femoral blood flow velocity (FBV), and muscle oxygen saturation ([Formula: see text]) continuously during the exercise. Femoral blood flow (FBF) was calculated from FBV and baseline femoral artery diameter. Stroke volume (SV), cardiac output (CO), and TPR were derived from the blood pressure tracings. Mean arterial blood pressure and TPR were significantly augmented in PAD compared with control during PF. FBF increased during exercise to an equal extent in both groups. However, [Formula: see text] of the exercising limb remained significantly lower in PAD compared with control. We conclude that the exaggerated pressor response in PAD is mediated by an abnormal TPR response, which augments redistribution of blood flow to the exercising extremity, leading to an equal rise in FBF compared with controls. However, this increase in FBF is not sufficient to normalize the SmO2 response during exercise in patients with PAD. NEW & NOTEWORTHY In this study, peripheral artery disease (PAD) patients and healthy control subjects performed graded, dynamic plantar flexion exercise. Data from this study suggest that previously reported exaggerated exercise pressor reflex in patients with PAD is driven by greater vasoconstriction in nonexercising vascular territories which also results in a redistribution of blood flow to the exercising extremity. However, this rise in femoral blood flow does not fully correct the oxygen deficit due to changes in other mechanisms that require further investigation.

scholarly journals Implementation of Supervised Exercise Therapy for Patients With Symptomatic Peripheral Artery Disease: A Science Advisory From the American Heart Association

Circulation ◽  
2019 ◽  
Vol 140 (13) ◽  
Author(s):  
Diane Treat-Jacobson ◽  
Mary M. McDermott ◽  
Joshua A. Beckman ◽  
Marsha A. Burt ◽  
Mark A. Creager ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Peripheral Artery Disease ◽  
Exercise Therapy ◽  
Outcome Measurement ◽  
The United States ◽  
Walking Ability ◽  
Peripheral Artery ◽  
Supervised Exercise ◽  
Artery Disease

Patients with lower-extremity peripheral artery disease (PAD) have greater functional impairment, faster functional decline, increased rates of mobility loss, and poorer quality of life than people without PAD. Supervised exercise therapy (SET) improves walking ability, overall functional status, and health-related quality of life in patients with symptomatic PAD. In 2017, the Centers for Medicare & Medicaid Services released a National Coverage Determination (CAG-00449N) for SET programs for patients with symptomatic PAD. This advisory provides a practical guide for delivering SET programs to patients with PAD according to Centers for Medicare & Medicaid Services criteria. It summarizes the Centers for Medicare & Medicaid Services process and requirements for referral and coverage of SET and provides guidance on how to implement SET for patients with PAD, including the SET protocol, options for outcome measurement, and transition to home-based exercise. This advisory is based on the guidelines established by the Centers for Medicare & Medicaid Services for Medicare beneficiaries in the United States and is intended to assist clinicians and administrators who are implementing SET programs for patients with PAD.

scholarly journals Health-related quality of life predicts long-term survival in patients with peripheral artery disease

2010 ◽  
Vol 15 (3) ◽  
pp. 163-169 ◽  
Author(s):  
Samson M Issa ◽  
Sanne E Hoeks ◽  
Wilma JM Scholte op Reimer ◽  
Yvette RBM Van Gestel ◽  
Mattie J Lenzen ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Peripheral Artery Disease ◽  
Health Related Quality ◽  
Peripheral Artery ◽  
Term Survival ◽  
Related Quality ◽  
Health Related ◽  
Artery Disease

scholarly journals Endoperoxide 4 receptors play a role in evoking the exercise pressor reflex in rats with simulated peripheral artery disease

2013 ◽  
Vol 591 (11) ◽  
pp. 2949-2962 ◽  
Author(s):  
Katsuya Yamauchi ◽  
Joyce S. Kim ◽  
Audrey J. Stone ◽  
Victor Ruiz-Velasco ◽  
Marc P. Kaufman
Keyword(s):  
Peripheral Artery Disease ◽  
Peripheral Artery ◽  
Exercise Pressor Reflex ◽  
Pressor Reflex ◽  
Artery Disease

scholarly journals The Secret of Preserved Quality of Life in Elderly Patients with Peripheral Artery Disease and Decreased Ankle-Brachial Index

2018 ◽  
Vol 15 (3) ◽  
pp. 27-32
Author(s):  
Anna-Boróka Tusa ◽  
Annamária Magdás ◽  
Réka-Júlia Tusa ◽  
Al. Incze
Keyword(s):  
Quality Of Life ◽  
Peripheral Artery Disease ◽  
Ankle Brachial Index ◽  
Inverse Correlation ◽  
Arterial System ◽  
Peripheral Artery ◽  
Significant Difference ◽  
Quitting Smoking ◽  
Artery Disease

SummaryObjective. In lower limb peripheral artery disease the most commonly used method for the assessment of the main arterial system is represented by the determination of ankle-brachial index (ABI). The post-occlusive reactive hyperaemia (PORH) is a controversial method used for the evaluation of primary collateral circulation. The follow-up of these patients has an underestimated part, their quality of life. The aim of this study is to evaluate this and highlight the importance of the PORH in the sight of optimal treatment.Method. 34 patients diagnosed with lower extremity artery disease, receiving conservative treatment, the ankle-brachial index was defined with a Doppler Bistos BT-200, 8 MHz device, the PORH was evaluated with a Bidop ES-100V, an instrument which sends information for a Smart-V-Link software. To assess the quality of life we used the VascuQol-6 test.Results. The age (mean ± SD) of the patients was 67.24±9.51, 52.92% were active smokers. A significant positive correlation was found between PORH and the results of VascuQol-6 test (p=0.02, r=0.38) and an inverse correlation between ABI <0.5 and VascuQol-6 >12. We noticed a significant difference between the VascuQol-6 result at smokers and non-smokers (p=0.02).Conclusions. The quality of life can be acceptable at patients with significant stenosis on the main artery and decreased ankle-brachial index due to presence of the collateral artery system with a maintained ability of vasodilatation represented by PORH. The efficiency of the treatmet is based on quitting smoking, starting programs which are helping patients to quit smoking would be useful.

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