Assessment of tissue blood flow using peripheral perfusion index

2010 ◽  
Vol 27 ◽  
pp. 55
Author(s):  
A. Smetkin ◽  
K. Gaidukov ◽  
V. Kuzkov ◽  
M. Kirov ◽  
L. Bjertnaes
Keyword(s):  
Blood Flow ◽  
Perfusion Index ◽  
Tissue Blood Flow ◽  
Peripheral Perfusion

Monitoring free flaps and replanted digits via perfusion index –A proof of concept study

2021 ◽  
pp. 1-9
Author(s):  
Catharina Strauss ◽  
Alexandra Anker ◽  
Silvan Klein ◽  
Robert Kemper ◽  
Vanessa Brebant ◽  
...  
Keyword(s):  
Blood Flow ◽  
Vascular Complications ◽  
Free Flaps ◽  
Vascular Complication ◽  
Perfusion Index ◽  
Peripheral Perfusion ◽  
Proof Of Concept ◽  
Pulsatile Blood Flow ◽  
Monitoring Tool

BACKGROUND: Early detection and treatment of vascular complications in replanted digits is essential for the survival. The perfusion index (PI) represents a marker of peripheral perfusion as it shows the ratio of pulsatile to non-pulsatile blood flow. OBJECTIVE: To evaluate the feasibility and applicability of the PI as a monitoring tool for free flaps and replanted digits by measuring the inter- and intraindividual changes in PI. METHODS: Five patients were postoperatively monitored according to intern standards by hourly clinical evaluation. Additionally, a pulse oximeter with SET-technology® (Masimo Radial 7, Masimo Corporation, Irvine, USA) was added with a LNCS® Red TFA-1 SpO2 sensor (Masimo Corporation, Irvine, USA) and respectively a LNCS® Neo-3 neonatal finger clip to evaluate the perfusion via PI and SpO2. RESULTS: All patients showed sufficient perfusion in clinical controls. There was no detectable vascular complication during follow-up. Mean perfusion index was 0.93 with a median of 0.44. The patients showed a mean SpO2 of 90.59%with a median of 89.21%. CONCLUSION: Our results show a great intra- and interindividual range of PI and SpO2. SpO2 provided an even greater range than PI. Trends in intraindividual PI changes may be a promising monitoring tool for free flaps and replanted digits.

MEASUREMENT OF BLOOD FLOW WITH FREELY DIFFUSIBLE INDICATORS AS INERT GASES, ANTIPYRINE, LABELLED WATER AND RUBIDIUM

1972 ◽  
Vol 68 (2_Supplb) ◽  
pp. S95-S111 ◽  
Author(s):  
Niels A. Lassen ◽  
Ole Andrée Larsen
Keyword(s):  
Blood Flow ◽  
Flow Measurement ◽  
Capillary Wall ◽  
Inert Gases ◽  
Tissue Blood Flow ◽  
Blood Flow Measurement

ABSTRACT Indicators which freely cross the capillary wall can be used for measurement of tissue blood flow in many different ways. Basically one can distinguish two categories of methods, viz. the ones where the indicator enters the tissue via the inflowing blood and the ones where the indicator is deposited locally in the tissue. The most important methods are briefly described with special emphasis on the theory of blood flow measurement.

Blood flow and high-energy phosphates in microregions of left ventricular subendocardium

1981 ◽  
Vol 240 (5) ◽  
pp. H804-H810 ◽  
Author(s):  
H. D. Kleinert ◽  
H. R. Weiss
Keyword(s):  
Blood Flow ◽  
Linear Relationship ◽  
Tissue Perfusion ◽  
High Energy ◽  
Left Ventricular ◽  
Significant Loss ◽  
Tissue Blood Flow ◽  
High Energy Phosphates ◽  
Tissue Samples ◽  
Heterogeneous Distribution

Blood flow and high-energy phosphate (HEP) content were determined simultaneously in multiple microregions of left ventricular subendocardium in 29 normal anesthetized open-chest rabbits by use of a new micromethod to determine whether a direct linear relationship existed between these parameters. Tissue samples weighed 1-2 mg. ATP and creatine phosphate (CP) content were quantitated in quick-frozen hearts by fluorometry at sites where tissue perfusion was measured by H2 clearance by use of bare-tipped platinum electrodes. A series of validation studies were conducted to ensure that 1) no significant damage to the tissue surrounding the electrode occurred during the period of experimentation and 2) no significant loss of biochemical constituents had occurred due to labile processes during freezing or storage of the tissue. Blood flow, ATP, and CP values averaged 79.1 +/- 24.1 (SD) ml.min-1.100 g-1, 4.9 +/- 1.3 mumol/g tissue, and 8.0 +/- 3.0 mumol/g tissue, respectively, and are similar to those reported in studies using larger tissue samples. Correlation between the heterogeneous distribution of tissue perfusion and HEP revealed no direct linear relationship between these parameters in the normal unstressed rabbit subendocardium.

THERMAL DILUTION METHODS: ESTIMATION OF TISSUE BLOOD FLOW AND METABOLISM

1980 ◽  
Vol 335 (1 Thermal Chara) ◽  
pp. 107-132 ◽  
Author(s):  
Robert C. Eberhart ◽  
Avraham Shitzer ◽  
Ernesto J. Hernandez
Keyword(s):  
Blood Flow ◽  
Tissue Blood Flow ◽  
Thermal Dilution

scholarly journals The Levels and Duration of Sensory and Motor Blockades of Spinal Anesthesia in Obese Patients That Underwent Urological Operations in the Lithotomy Position

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Taner Ciftci ◽  
Ali Bestemi Kepekci ◽  
Hatice Pınar Yavasca ◽  
Hayrettin Daskaya ◽  
Volkan İnal
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Spinal Anesthesia ◽  
Tissue Blood Flow ◽  
Spinal Block ◽  
Lithotomy Position ◽  
Obese Patients ◽  
Hemodynamic Changes ◽  
Nonobese Patients ◽  
Transurethral Prostate Resection

Obesity has a significant effect on the cephalic spread of a spinal block (SB) due to a reduction in cerebrospinal fluid (CSF). SB is controlled by the tissue blood flow in addition to the CSF. Some positions and techniques of surgery used can cause changes in hemodynamics. We investigated effects of hemodynamic changes that may occur during Transurethral prostate resection (TUR-P) and lithotomy position (LP) at the SB level in obese versus nonobese individuals. Sixty patients who had undergone TUR-P operation under spinal anesthesia were divided into a nonobese (BMI<25 kg/m2, Group N) or obese (BMI≥30 kg/m2, Group O) group. SB assessments were recorded afterthe LP. SB at 6 and 120 min and the peak SB level were compared between two groups. Hemodynamics were recorded after LP. Peak and 6 min SB levels were similar between the groups, while 120 min SB levels were significantly higher for Group O (P<0.05). Blood pressure (BP) after the LP was significantly higher for Group N (P<0.05). LP and TUR-P increased the BP in Group N when compared to Group O. The increase in hemodynamics enhances the blood flow in the spinal cord and may form similar SB levels in nonobese patients to those in obese patients. However, SB time may be longer in obese patients.

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