Vascular Access Surveillance: Evaluation of Combining Dynamic Venous Pressure and Vascular Access Blood Flow Measurements

2003 ◽  
Vol 23 (6) ◽  
pp. 403-408 ◽  
Author(s):  
Heidi Hoeben ◽  
Ali K. Abu-Alfa ◽  
Robert F. Reilly ◽  
John E. Aruny ◽  
Koenraad Bouman ◽  
...  
Keyword(s):  
Blood Flow ◽  
Vascular Access ◽  
Venous Pressure ◽  
Flow Measurements ◽  
Blood Flow Measurements

Blood Flow Measurements during Hemodialysis Vascular Access Interventions - Catheter-Based Thermodilution or Doppler Ultrasound?

2011 ◽  
Vol 13 (2) ◽  
pp. 145-151 ◽  
Author(s):  
Søren T. Heerwagen ◽  
Marc A. Hansen ◽  
Torben V. Schroeder ◽  
Søren D. Ladefoged ◽  
Lars Lönn
Keyword(s):  
Blood Flow ◽  
Doppler Ultrasound ◽  
Vascular Access ◽  
Flow Measurements ◽  
Hemodialysis Vascular Access ◽  
Blood Flow Measurements

Isovolemic hemodilution in experimental focal cerebral ischemia

1988 ◽  
Vol 69 (1) ◽  
pp. 72-81 ◽  
Author(s):  
Yong-Kwang Tu ◽  
Roberto C. Heros ◽  
Guillermo Candia ◽  
Akio Hyodo ◽  
Karen Lagree ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Intracranial Pressure ◽  
Histopathological Examination ◽  
Venous Pressure ◽  
Arterial Occlusion ◽  
Sham Operation ◽  
Flow Measurements ◽  
Isovolemic Hemodilution ◽  
Blood Flow Measurements

✓ A total of 76 splenectomized dogs were entered in a study of the value and effects of isovolemic hemodilution. Of these, seven were not included in the analysis because of technical errors. Of the remaining 69 dogs, 35 were treated with hemodilution; 28 were subjected to a 6-hour period of temporary occlusion of the distal internal carotid artery and the proximal middle cerebral artery, and seven underwent a sham operation only, with arterial manipulation but no occlusion. The other 34 dogs were not subjected to hemodilution; 26 of these underwent temporary arterial occlusion and eight had a sham operation only. In each group the animals were about equally divided into 1) an acute protocol with regional cerebral blood flow measurements by a radioactive microsphere technique and sacrifice at the end of the acute experiment, and 2) a chronic protocol with survival for 1 week to permit daily neurological assessment and final histopathological examination but without blood flow measurements. Isovolemic hemodilution was performed about 1 hour after the arterial occlusion or sham operation and was accomplished by phlebotomy and infusions of low molecular weight dextran to bring the hematocrit to a level of 30% to 32%. This treatment resulted in a very significant reduction in viscosity and fibrinogen levels. The decrease in hematocrit lasted throughout the week in the animals in the chronic protocol. The decrease in viscosity correlated almost linearly with the decrease in hematocrit. There was a slight decrease in systemic arterial pressure with hemodilution but there were no significant changes in central venous pressure or in pulmonary arterial or wedge pressure. There was a slight decrease in cardiac index in both the hemodilution and control groups, which may have been due to the effects of barbiturate anesthesia. There was a slight increase in the measured blood volume in both groups, which was probably artifactual and related to the method of calculation. Intracranial pressure increased significantly with time in all animals subjected to arterial occlusion, but this increase was less severe in the hemodilution group. There was no significant change in intracranial pressure in sham-operated animals, whether hemodiluted or not. The results of cerebral blood flow measurements, assessment of neurological condition, and measurement of infarct size are given in Part 2 of this report.

Prognostic value of intraoperative blood flow measurements in vascular access surgery

Surgery ◽  
1998 ◽  
Vol 124 (4) ◽  
pp. 729-738 ◽  
Author(s):  
Christopher P. Johnson ◽  
Yong-ran Zhu ◽  
Carrie Matt ◽  
Corey Pelz ◽  
Allan M. Roza ◽  
...  
Keyword(s):  
Blood Flow ◽  
Vascular Access ◽  
Prognostic Value ◽  
Flow Measurements ◽  
Vascular Access Surgery ◽  
Blood Flow Measurements ◽  
Access Surgery

Clinical Utility of Quantitative Cerebral Blood Flow Measurements during Internal Carotid Artery Test Occlusions

Neurosurgery ◽  
2002 ◽  
Vol 50 (5) ◽  
pp. 996-1005 ◽  
Author(s):  
Randolph S. Marshall ◽  
Ronald M. Lazar ◽  
William L. Young ◽  
Robert A. Solomon ◽  
Shailendra Joshi ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Clinical Utility ◽  
Internal Carotid ◽  
Flow Measurements ◽  
Blood Flow Measurements

Doppler Blood Flow Measurements in Chronic Animal Preparations

1975 ◽  
Vol 49 (3) ◽  
pp. 17P-17P
Author(s):  
Maurice R. Cross ◽  
Clive Weller ◽  
E. B. Raftery
Keyword(s):  
Blood Flow ◽  
Flow Measurements ◽  
Blood Flow Measurements

Duplex Sonography of Normal Renal Allografts

1989 ◽  
Vol 30 (1) ◽  
pp. 53-56 ◽  
Author(s):  
B. Schwaighofer ◽  
F. Kainberger ◽  
F. Fruehwald ◽  
P. Huebsch ◽  
N. Gritzmann ◽  
...  
Keyword(s):  
Blood Flow ◽  
Resistive Index ◽  
Duplex Sonography ◽  
Invasive Technique ◽  
Flow Measurements ◽  
Renal Allografts ◽  
Significant Difference ◽  
Main Renal Artery ◽  
Long Term Follow Up ◽  
Blood Flow Measurements

Thirty-five patients with normal renal allografts as well as 10 healthy volunteers with normal native kidneys were examined by duplex sonography. Blood flow measurements were performed in the main renal artery as well as in segmental, interlobar and arcuate arteries. In both groups the normal range of variation in blood flow was defined by using the resistive index (RI). Doppler wave forms and RI of main renal arteries were both similar to those of their branches. In renal allografts as well as in native kidneys the blood flow pattern showed a rapid up-slope in systole followed by a gradual down-slope in early diastole, with a persistent flow throughout diastole. In addition, there was no significant difference in the RI between allografted and native kidneys. The interobserver variability was less than 10 per cent. The mean RI was 0.68 using all data points. Vascular rejection in 11 patients could be discriminated significantly (p<0.001). Duplex sonography is useful in evaluating renal blood flow. This simple and non-invasive technique seems to be useful in long-term follow-up of renal allograft recipients.

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