Contribution of arteriovenous anastomoses to vasoconstriction induced by local heating of the human finger.

Nagasaka, Tetsuo; Hirata, Kozo; Nunomura, Tadahiro

doi:10.2170/jjphysiol.37.425

Cited by 37 publications

(13 citation statements)

References 13 publications

(16 reference statements)

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“…The high S m O 2 value of 92.6±3.7% observed for the fingertip of volunteers at rest agreed well with the oxygen saturation value of 92±2.6% reported by Caspary et al [11] who also conducted the similar experiment. This is due to the presence of Arteriovenous anastomoses (AVAs) that are available in abundance in acral (fingertip) than non-acral skin (back of the hand) [12]. This result in a lower S m O 2 with mean value of 39.8±6.85% observed in this work for the back of the hand experiment.…”

Section: Discussionmentioning

confidence: 59%

Nonlinear fitting model for continuous monitoring of mean blood oxygen saturation

Huong¹,

Koh²,

Ngu³

2014

2014 International Conference on Computational Science and Technology (ICCST)

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We aim to demonstrate the use of Extended Modified Lambert Beer model (EMLB) to detect changes in one's mean blood oxygen saturation (S m O 2 ) with different experimental settings. We performed spectroscopy measurement on fingertip and back of the hand of four healthy adults at rest condition, and on the same fingertip after the heat application. The attenuation values given from EMLB are fitted to the experimental reflectance data in the estimation of S m O 2 . The obtained results revealed mean S m O 2 of 92.6±3.7%, 39.8±6.85% and 102±3.1%, respectively, estimated for measurement on the fingertip and the back of the hand of volunteers at rest, and the heated fingertips. This work concluded that Extended Modified Lambert Beer model can potentially be used to monitor skin oxygenation. Keywords-Mean blood oxygen saturation, Extended Modified Lambert Beer model, skin oxygenation, spectroscopy.

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Section: Discussionmentioning

confidence: 59%

Nonlinear fitting model for continuous monitoring of mean blood oxygen saturation

Huong¹,

Koh²,

Ngu³

2014

2014 International Conference on Computational Science and Technology (ICCST)

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“…This laser Doppler flowmetry has been shown to correlate well with many of the conventional methods used to assess peripheral blood flow (STERN et al, 1977(STERN et al, , 1979ENGELHART and KRISTENSEN,1983;LARRABEE et a!.,1983;SMITs et a!., 1986). However, we have observed previously that local heating of the hand from 37 to 41 ~C in a warm environment caused a reduction of finger blood flow when measured by venous occlusion plethysmography and, in contrast, a continued increase of finger blood flow when measured by laser Doppler flowmetry (PERIFLUX PF-ld) (NAGASAKA et a!., 1987). Thus the pattern of blood flow changes in the human finger in response to local heating moved in opposite directions, as measured by laser Doppler flowmetry and venous occlusion plethysmography.…”

Section: Discussionmentioning

confidence: 65%

Partitional measurements of circulation can be made between capillaries and arterovenous anastomoses in the human finger.

Nagasaka¹,

Hirata²,

Nunomura³

1988

Jpn.J.Physiol

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We compared the responses of finger blood flow to local and/or whole body warming, as measured by laser Doppler flowmetry (PERIFLUX PF-ld) (LDF), and by venous occlusion plethysmography (BF). The subject's hands were immersed in a bath of water whose temperature (TW) was initially set at 25°C. The tested hand was kept at about 10 cm above heart level to facilitate the drainage of finger veins during measurement. The ambient temperature (Ta) was initially 20 C. Then, measurements were made under the following conditions on separate days: 1) local hand warming ony (LHW), Tw was raised from 25 to 40°C; 2) whole body warming only (WBW), Ta was raised from 20 to 35°C; and 3) LHW and WBW combined (CW), LHW (TW was raised to 35°C and maintained) was followed by WBW. Results showed that both LHW and WBW increased LDF and BF. LDF signals correlated significantly with BF values in each condition (r = 0.932-0.955). However, the slope of the line showing the relationship of LDF and BF, determined by least squares linear regression analysis, was steeper in LHW than in WBW. In CW, the slope showed a bend, creating two different sections in the relationship. Below the bend the relation was steeper and showed a similar slope as that in LHW; above the bend, the relation was more gradual and a similar slope as that in WBW. No such bend was observed in measurements of the forearm skin in CW. The present results suggest that partitional measurements of circulation between AVA's and superficial vessels can be made in the finger by the simultaneous use of laser Doppler flowmetry and venous occlusion plethysmography. Local warming of the hand increases finger blood flow mainly through capillaries and subpapillary vessels and indirect whole body warming increases finger blood flow predominantly through deeply located vessels, presumably including AVA's.

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“…Taken together with findings obtained from the sheep's hindleg [14] and dog's tongue [32], evidence suggests that the AVA's are the vascular compartments responsible for this heatinduced vasoconstriction in the finger. NAGASAKA et al [26] demonstrated the effects of 2 °C-stepwise increases in local temperature from 35 to 43°C on the superficial vessels of the finger. As described above, finger blood flow in the heated hand measured with venous occlusion plethysmography was significantly lower than that in the control hand at TW of 39-41 °C.…”

Section: C) Vascular Compartments Responsible For the Heat-induced Vamentioning

confidence: 99%

“…This has been evaluated by measuring finger blood flows with two different laser Doppler flow-probes [26]. The laser Doppler-probes consist of parallel exciting and receiving optic fibers separated at a certain distance.…”

Section: C) Vascular Compartments Responsible For the Heat-induced Vamentioning

confidence: 99%

“…Therefore, separate descriptions of blood flow response may be needed for these two skin areas. a) Finger vasoconstriction evoked by hand heating NAGASAKA et al [23,24,26,27] have recently observed that finger vessels constrict when the hand is heated locally to temperatures above body core temperature. In their study, finger blood flows were simultaneously measured in both hands immersed in separate baths of water whose temperature (TW) was kept initially at 35°C.…”

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confidence: 99%

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Skin Vasoconstriction Induced by Local Skin Heating

Nagasaka

1987

Jpn.J.Physiol

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Skin blood flow increases with heat stimulation on the shell or of the central thermoreceptors. In skin areas containing arteriovenous anastomoses (AVA's), e.g., fingers, toes, and ears [5], this increase in skin blood flow is due to the release of vasoconstrictor tone through the sympathetic nervous system [37]. When such areas of the skin are warmed locally, however, the level of local blood flow becomes even higher than before; thus, the local and reflex effects of heat are additional to the thermoregulatory vasodilating response [43]. There is, nevertheless, an exception to this general statement. When the environmental temperature exterior to the skin becomes higher than body core temperature, skin vasodilatation will increase heat gain and hence enhance hyperthermia. From this consideration, one is tempted to look more closely at skin blood flow when the skin is exposed to extremely high exterior temperatures. This review will outline recent studies on this particular vascular response of the skin, both in humans and in animals.

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Contribution of arteriovenous anastomoses to vasoconstriction induced by local heating of the human finger.

Cited by 37 publications

References 13 publications

Nonlinear fitting model for continuous monitoring of mean blood oxygen saturation

Nonlinear fitting model for continuous monitoring of mean blood oxygen saturation

Partitional measurements of circulation can be made between capillaries and arterovenous anastomoses in the human finger.

Skin Vasoconstriction Induced by Local Skin Heating

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