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To validate intraoperative pulse hemoglobin (SpHb) measurements in anesthetized patients with large forearm temperature – fingertip temperature gradients.
There were no significant correlations between the SBF ratio and any hemodynamic or blood gas-derived variable, administration of vasoactive drugs (Additional file 1: Figure S4), presence of sepsis (Additional file 1: Table S3), degree/severity of organ dysfunction (SOFA score), initial forearm temperature or the difference between the central to forearm temperature (Additional file 1: Figure S5).
There were no significant correlations between the SBF ratio and any hemodynamic or blood gas-derived variable, dose of vasoactive drugs, presence of sepsis (Additional file 1: Table S3), degree/severity of organ dysfunction (SOFA score), initial forearm temperature or the difference between the central to forearm temperature (all p values > 0.05).
The interpolation equations for different body parts make it possible to test the time course of temperature Tskin, calculated through Olesen's formula with 3 measurement points [ 16]: (5) T skin = 0,5 a + 0,14 b + 0,36 c, where a is chest temperature, b is forearm temperature, and c is calf temperature.
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Therefore, to remove some of the variability in previous studies, a water bath was used to elevate all forearm temperatures to that of the core, 37 deg C. Subjects placed their arms in a bath heated to core body temperature of 37 deg C with the arm held dependant and the elbow at an angle of 90 degrees such that their arms were submerged to the belly of the biceps muscle.
Using the cosinor or ANOVA methods, circadian rhythms could be detected for sebum excretion (face), transepidermal water loss (face and forearm), skin temperature (forearm), pH (face), and capacitance (forearm).
Train of four (TOF) electrodes was fixed to the ulnar edge of the distal forearm, a temperature probe was placed on the palm, and the transducer was put on the inner side of the thumb.
Cortical potentials after contact heat stimulation of the cheeks and the volar forearm at a temperature of 51°C showed significantly reduced A-δ-amplitudes in patients and healthy controls.
In a study of 500 healthy participants, a polymorphism in OPRD rs2234918 was associated with a gender-specific difference in thermal pain sensitivity when pain was generated by applying a thermode to the forearm with increasing temperature at 5 s rate [ 22].
In another study, patients with abnormal perfusion had a higher forearm-to-fingertip temperature gradient and a higher central-to-toe temperature difference (10 ± 4.1 vs 6.5 ± 3.4 °C, P < 0.001).
Lima et al. [30] described that nitroglycerin infusion improved forearm-to-fingertip temperature gradient in few patients with acute circulatory failure from 3.3 ± 0.7 to 0.7 ± 0.6 °C (P < 0.05).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com