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Titolo:
EFFECTS OF A SUDDEN FLOW REDUCTION ON RED-BLOOD-CELL ROULEAU FORMATION AND ORIENTATION USING RF BACKSCATTERED POWER
Autore:
QIN Z; DURAND LG; ALLARD L; CLOUTIER G;
Indirizzi:
INST RECH CLIN MONTREAL,BIOMED ENGN LAB,110 AVE PINS OUEST MONTREAL PQ H2W 1R7 CANADA INST RECH CLIN MONTREAL,BIOMED ENGN LAB MONTREAL PQ H2W 1R7 CANADA UNIV MONTREAL,DEPT MED MONTREAL PQ H3C 3J7 CANADA
Titolo Testata:
Ultrasound in medicine & biology
fascicolo: 4, volume: 24, anno: 1998,
pagine: 503 - 511
SICI:
0301-5629(1998)24:4<503:EOASFR>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
ERYTHROCYTE AGGREGATION;
Keywords:
ACOUSTIC BACKSCATTERING; RED BLOOD CELL AGGREGATION; BIORHEOLOGY; ULTRASOUND RADIOFREQUENCY BACKSCATTERED POWER; PULSE-ECHO; A-MODE; KINETICS OF ROULEAU FORMATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
15
Recensione:
Indirizzi per estratti:
Citazione:
Z. Qin et al., "EFFECTS OF A SUDDEN FLOW REDUCTION ON RED-BLOOD-CELL ROULEAU FORMATION AND ORIENTATION USING RF BACKSCATTERED POWER", Ultrasound in medicine & biology, 24(4), 1998, pp. 503-511

Abstract

In most studies that were aimed at evaluating the kinetics of red blood cell (RBC) aggregation, human blood was initially circulated at a high shear rate to disrupt the aggregates, and measurements were performed following a complete how stoppage, during the process of rouleau formation. However, it is known that a very low shear rate can enhance the formation of aggregates, as demonstrated by the modal relationshipof the shear-rate dependence of RBC aggregation. The objective of thepresent study was, thus, to evaluate the influence of sudden flow reductions compared to a complete how stoppage on the kinetics of rouleauformation, using ultrasound backscattering. Horse blood models, characterized by different aggregation levels, were obtained by diluting the plasma with a saline solution in different proportions. Blood was circulated in a 12.7-mm vertical tube at a flow rate of 1250 mt min(-1) (prereduction flow rate) to disrupt the aggregates. The ultrasound radiofrequency (RF) signal was recorded from the center of the tube following different levels of sudden flow reduction or complete stoppage (postreduction flow rate). All measurements were performed over 2 min, using a 10-MHz transducer, No power increase was observed after complete flow stoppage. For postreduction flow rates varying between 20 and 160 mt min(-1), the backscattered power increased proportionally with the kinetics of RBC aggregation. The echo buildup was also faster and stronger when the postreduction flow rate was increased. An unexpected pattern of variation of the backscattered power was found for horse RBCs characterized by high kinetics of rouleau formation, The power increased rapidly to a plateau, followed by another rapid increase and another plateau, Rouleau formation, random disorientation and reorientation were postulated to explain the phasic power increases observed. (C)1998 World Federation for Ultrasound in Medicine & Biology.

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Documento generato il 20/09/20 alle ore 04:27:31