Results 201 to 210 of about 4,106,222 (239)

Limitation of pulsatility index as a diagnostic tool in the newborn

Critical Care Medicine, 1983
Pulsatile flow in the anterior cerebral arteries was studied and pulsatility index (PI) calculated by 3 observers in 10 newborn infants in order to establish the reproducibility of a noninvasive Doppler technique. No significant differences were noted among the observers and the estimated error of observation was 0.073. Subsequently, 14 healthy preterm
P J, Hancock, R N, Goldberg, E, Bancalari, M C, Hill, T, Castillo   +4 more
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Hemodynamic and arteriographic evaluation of femoral pulsatility index

Journal of Surgical Research, 1982
Femoral pulsatility index (FPI), a function derived from the Doppler arterial velocity spectrum which is independent of Doppler probe/vessel angle, has previously been reported to be inversely proportional to the angiographically determined degree of aortoiliac stenosis.
D P, Flanigan, J T, Collins, J A, Schwartz, C, O'Mara, W R, Flinn, J J, Bergan, J S, Yao   +6 more
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Some failings of pulsatility index and damping factor

Ultrasound in Medicine & Biology, 1986
Pulsatility index (PI) is a commonly used method of objective assessment of the Doppler waveform. PI falls with increasing proximal stenosis and is raised by increasing peripheral resistance. Damping factor (DF) for an arterial segment is calculated by dividing the proximal by the distal PI.
Baker, AR, Evans, DH, Prytherch, DR, Morton, DB, Bentley, S, Asher, MJ, Bell, PRF   +6 more
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Transcranial Doppler Pulsatility Index

Neurosurgery, 2010
Transcranial Doppler sonography (TCD) assessment of intracranial blood flow velocity has been suggested to accurately determine intracranial pressure (ICP).We attempted to validate this method in patients with communicating cerebrospinal fluid systems using predetermined pressure levels.Ten patients underwent a lumbar infusion test, applying 4 to 5 ...
Anders, Behrens, Niklas, Lenfeldt, Khalid, Ambarki, Jan, Malm, Anders, Eklund, Lars-Owe, Koskinen   +5 more
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Pulsatility Index, Patent Ductus Arteriosus, and Brain Damage

Pediatrics, 1982
The study of CBF velocity by external Doppler method appears to offer the clinician a noninvasive tool with which to gather information related to changes in cerebral hemodynamics. Inasmuch as the clinical condition of sick preemature infants is different from that of adults with obstructive vascular disease, and as the arteries under study are deeper ...
R, Bejar, T A, Merritt, R W, Coen, F, Mannino, L, Gluck   +4 more
openaire   +2 more sources

Prognostic value of Pulsatility Index in acute intracerebral hemorrhage

Neurology, 2003
To investigate whether data obtained by transcranial Doppler (TCD) have prognostic value in patients with intracerebral hemorrhage (ICH).A prospective study of patients with an acute (
J, Martí-Fàbregas, R, Belvís, E, Guardia, D, Cocho, J, Muñoz, L, Marruecos, J-L, Martí-Vilalta   +6 more
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Femoral pulsatility index in the evaluation of aortoiliac occlusive disease

Journal of Surgical Research, 1981
Abstract Accurate, noninvasive, hemodynamic assessment of atherosclerosis involving the aortoiliac segment remains a frontier in vascular surgery. Femoral pulsatility index, a vessel/probe angle independent function derived from the common femoral artery sonogram, was evaluated by comparison to the invasive hemodynamic parameters of pressure and flow
D P, Flanigan, J T, Collins, J J, Goodreau, S J, Burnham, J S, Yao   +4 more
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Increased Pulsatility Index Is Associated with Intracranial Arterial Calcification

European Neurology, 2012
<b><i>Background/Aims:</i></b> An increase in the pulsatility index (PI) has been suggested to reflect distal vascular resistance. The purpose of the present study was to investigate the association between intracranial arterial calcification and intracranial PIs.
Kwang-Yeol, Park, Pil-Wook, Chung, Yong Bum, Kim, Heui-Soo, Moon, Bum-Chun, Suh, Won Tae, Yoon   +5 more
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Transcranial Doppler Pulsatility Index: What it is and What it Isn’t

Neurocritical Care, 2012
Transcranial Doppler (TCD) pulsatility index (PI) has traditionally been interpreted as a descriptor of distal cerebrovascular resistance (CVR). We sought to evaluate the relationship between PI and CVR in situations, where CVR increases (mild hypocapnia) and decreases (plateau waves of intracranial pressure-ICP).Recordings from patients with head ...
de Riva, Nicolás, Budohoski, Karol P, Smielewski, Peter, Kasprowicz, Magdalena, Zweifel, Christian, Steiner, Luzius A, Reinhard, Matthias, Fábregas, Neus, Pickard, John D., Czosnyka, Marek   +9 more
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Comparison of umbilical artery pulsatility index reference ranges

Ultrasound in Obstetrics & Gynecology
ABSTRACTObjectiveTo compare the accuracy of four published reference standards for the umbilical artery pulsatility index (UA‐PI) in predicting small‐for‐gestational age (SGA), adverse neonatal outcomes and obstetric complications in pregnancies at risk for fetal growth restriction.MethodsThis was a secondary analysis of a prospective study of ...
J. R. Duncan, L. E. Markel, K. Pressman, A. R. Rodriguez, S. G. Obican, A. O. Odibo   +5 more
openaire   +2 more sources