The effect of temperature on the relative viscosity of human blood

Barbee, James H.

doi:10.3233/bir-1973-10101

Cited by 50 publications

(22 citation statements)

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“…Low resting body temperature (ϳ32-35°C), stemming from both reduced metabolism and lack of an insulating pelage, could also promote low NMR cardiac function by decreasing cardiac output. A decrease in temperature by 1°C can cause a 2% increase blood viscosity (1,21). This, coupled with the already higher hematocrit levels, means the NMR heart must pump against a much more viscous fluid than those of aboveground-dwelling mammals.…”

Section: Discussionmentioning

confidence: 99%

Cardiac function of the naked mole-rat: ecophysiological responses to working underground

Grimes

Voorhees

Chiao

et al. 2014

American Journal of Physiology-Heart and Circulatory Physiology

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Section: Discussionmentioning

confidence: 99%

Cardiac function of the naked mole-rat: ecophysiological responses to working underground

Grimes

Voorhees

Chiao

et al. 2014

American Journal of Physiology-Heart and Circulatory Physiology

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“…Hypothermia is known to increase the ischemic tolerance of the skeletal muscle 12,13 , in contrast, cooling affects the hemorheological factors 19,28 . Our workgroup observed impaired red blood cell deformability after 3-hour hind limb ischemiareperfusion, which was more expressed after cooling 19 .…”

Section: Effects Of Coolingmentioning

confidence: 99%

Hematological and hemostaseological alterations after warm and cold limb ischemia-reperfusion in a canine model

et al. 2009

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PURPOSE: Acute ischemia-reperfusion (I/R) of extremities means serious challenge in the clinical practice. Furthermore, the issue of preventive cooling is still controversial. In this canine model we investigated whether limb I/R -with or without cooling- has an influence on hematological and hemostaseological factors. METHODS: Femoral vessels were exposed and clamped for 3 hours. After release the clamps, 4-hour reperfusion was secured. The same procedures with cooling using ice bags, as well as warm and cold sham-operations were performed. Before operations, from the excluded limb by the end of ischemia, during the reperfusion, and for 5 postoperative days afterwards blood samples were collected for testing hematological and blood coagulation parameters. RESULTS: After I/R activated partial thromboplastin time was elongated on 2nd-4th postoperative days. The highest values were on the 2nd day in cold I/R group, accompanied by increased prothrombin time values. The hematological parameters and fibrinogen level showed non-specific changes. In excluded ischemic limb the blood composition showed controversial data. Cold ischemia induced larger alterations, however platelet count, hematocrit changed more expressly in warm ischemia. CONCLUSION: These results indicate the risk of coagulopathy following limb I/R on early post-eventually days, which risk is higher in the case of cold I/R.

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“…Blood viscosity is also dependent upon a number of other factors, including plasma viscosity (Goldsmith and Skalak, 1975), temperature (Barbee, 1973;Chen and Chien, 1978), the deformability of RBCs (Chien ~al., 1967) and the blood Bet (Cerny~ al., 1962;Skalak~ al., 1972). …”

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confidence: 99%

Aspects of cardiovascular oxygen transport in vertebrates

Hedrick¹

2000

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The hematological and rheological characteristics of blood from a number of vertebrates was compared to assess possible species differences in blood viscosity that may influence cardiovascular oxygen The predicted in vitro optimal hematocrit (Bo) for oxygen transport was determined for each species and compared to the observed ill.1i!2. hematocrit (Bet). There was a very close correspondence between the predicted Bo and the observed normal Bet for the blood tested, with the exception of elephant seal (Mirounga angustirostris) blood.Resting and maxim.al rates of blood flow at lOoc, 2ooc and 3oocwere measured in Bufo marinus with magnetic blood flow probes to assess the relative contributions of heart rate, systemic arch pulse volume and arteriovenous (A-V) oxygen difference to increased oxygen consumption (V02). A-V 02 difference accounted for 100%, 84% and 88% of the increase in V02 during maximal exercise at iooc, 2ooc and 3ooc, respectively.Systemic arch pulse volume remained nearly constant over a wide range of heart~rates (15-115 beats min-l)thus contributing little to increased cardiac output during increased V02.Changes in blood flow rates through the systemic arches of resting toads were predicted by in vitro changes in blood viscosity over a 1ooc to 30oc interval. Resting animals did not appear to actively compensate for the passive alterations in viscosity that seemed to influence blood flow rates in viyo.

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The effect of temperature on the relative viscosity of human blood

Cited by 50 publications

References 0 publications

Cardiac function of the naked mole-rat: ecophysiological responses to working underground

Cardiac function of the naked mole-rat: ecophysiological responses to working underground

Hematological and hemostaseological alterations after warm and cold limb ischemia-reperfusion in a canine model

Aspects of cardiovascular oxygen transport in vertebrates

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