Effect of remote intermittent ischemia on contralateral extremities skins microcirculation

Physiology 2015 (Cardiff, UK) (2015) Proc Physiol Soc 34, PC132

Poster Communications: Effect of remote intermittent ischemia on contralateral extremities skins microcirculation

A. Paparde1,2, D. Buza3, L. Plakane2,3

1. Human physiology and biochemistry, RSU, Riga, Latvia. 2. University of Latvia Institute of Experimental and Clinical Medicine, Riga, Latvia. 3. Department of Human and Animal Physiology, University of Latvia Faculty of Biology, Riga, Latvia.

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Body’s endogenous protective capabilities are challenged in different stress situations and one of challenge is adequate blood flow changes which could causes oxygen concentration large fluctuations and ischemia/reperfusion injury. Studies confirm that interorgan protection against injury could be promoted by previous short ischemic events (Przyklenk et al. 1993); even more this adaptation could be remotely promoted (Hausenloy & Yellon 2008). Remote ischemic preconditioning (RIPC) stimulus, nonlethal limb ischemia can be achieved by applying a suprasystolic blood pressure by cuff to limb. RIPC is used in cardioprotection (Hausenloy & Yellon 2008), however there exists evidence that protective linkage exists between other vascular beds (Enko et al. 2011). The mechanism, which exerts protection in a remote organ, is currently unclear (Hausenloy & Yellon 2008). The aim of study was to determine whether RIPC induces local regulatory activity changes in contralateral upper limb’s skin microcirculation. Eleven healthy young participant’s, age (24±3,yr), height (1.71±0.10,m), mass (68±8,kg) and BMI (23±2,kg/m2), without systemic or peripheral vascular diseases. Data were collected continually by single point laser Doppler imaging (moorLDI2) at the forearm’s dorsal non-glabrous skin 10 cm distally from elbow joint. After 10 min baseline was RIPC applied to contralateral limb by inflating a blood pressure cuff placed on the upper arm to 200 mmHg for 5 min and deflating the cuff for 5 min; a cycle was performed four times, followed by 10 min recovery. To evaluate local regulatory factors was used wavelet transformation, the frequency intervals of 0.0095-0.021, 0.021-0.052, and 0.052-0.145 Hz corresponding represents endothelial, sympathetic, and myogenic activity (Hodges & Del Pozzi 2014) of the microcirculatory regulation. All data are non-parametrically distributed and presented as medina (25%; 75%). To compare samples before (B) and after (A) RIPC was used Wilcoxon Signed Rank Test. Systemic circulation parameters were influenced by RIPC, statistically significant changes in mean arterial pressure (B=79.8(75.0; 88.3) vs. A=79.5(74.7; 82.7) mmHg; P=0.005) and heart rate (B=57(54;61) vs. A=55(50; 60) BPM; P<0.001) was observed, but it were not physiologically significant. Blood perfusion was not changed by RIPC (B=42(31;52) vs. A=51(37;57) PU; P=0.054) and there was not discovered significant change in endothelial activity (B=0.69(0.24;1.89) vs. A=1.02(0.42;2.20) PU2/Hz; P=0.269). However, significant change of fluctuations were observed in sympathetic (B=1.68(0.58;2.99) vs. A=2.70(0.99;4.84) PU2/Hz; P=0.035) and myogenic (B=2.42(1.00;2.92) vs. A=2.91(1.49;6.60) PU2/Hz; P=0.012) activity. RIPC induces different vascular regulatory remodulation in contralateral microvascular bed by changing sympathetic and myogenic activity of the microcirculatory regulation.



Where applicable, experiments conform with Society ethical requirements.

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