Radioisotopes, ultrasons et thermographie dans le diagnostic des troubles circulatoires cérébraux

Planiol, T; Pourcelot, L.; Itti, R.

doi:10.1016/s0370-4475(74)80006-7

Cited by 6 publications

(4 citation statements)

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“…We first measured well‐established indices such as the pulsatility index (PI) and the resistance index (RI). These indices developed in the 1970s are widely used in Doppler ultrasound (Gosling et al,1971; Planiol et al,1974). They offer an overall measure of the blood flow characteristics in the arteries or heart using a single value which is not sensitive to the absolute blood flow velocity and can be easily obtained (Thompson et al,1988).…”

Section: Resultsmentioning

confidence: 99%

“…Pulsed Doppler waveforms are generated using Matlab (MathWorks, Massachusetts), and both heart rate and common indices such as pulsatility index (PI; Gosling et al,1971) and resistance index (RI; Planiol et al,1974) were calculated with Matlab. PI and RI are defined by: where Max is the maximal Doppler shift, Min is the minimal Doppler shift, and Avg is the time‐averaged Doppler shift.…”

Section: Methodsmentioning

confidence: 99%

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Optical coherence tomography captures rapid hemodynamic responses to acute hypoxia in the cardiovascular system of early embryos

Jenkins

Peterson

et al. 2012

Developmental Dynamics

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Background The trajectory to heart defects may start in tubular and looping heart stages when detailed analysis of form and function is difficult by currently available methods. We used a novel method, Doppler optical coherence tomography (OCT), to follow changes in cardiovascular function in quail embryos during acute hypoxic stress. Chronic fetal hypoxia is a known risk factor for congenital heart diseases (CHDs). Decreased fetal heart rates during maternal obstructive sleep apnea suggest that studying fetal heart responses under acute hypoxia is warranted. Results We captured responses to hypoxia at the critical looping heart stages. Doppler OCT revealed detailed vitelline arterial pulsed Doppler waveforms. Embryos tolerated 1 hour of hypoxia (5%, 10%, or 15% O2), but exhibited changes including decreased systolic and increased diastolic duration in 5 minutes. After 5 minutes, slower heart rates, arrhythmic events and an increase in retrograde blood flow were observed. These changes suggested slower filling of the heart, which was confirmed by 4-D Doppler imaging of the heart itself. Conclusions Doppler OCT is well suited for rapid non-invasive screening for functional changes in avian embryos under near physiological conditions. Analysis of the accessible vitelline artery sensitively reflected changes in heart function and can be used for rapid screening. Acute hypoxia caused rapid hemodynamic changes in looping hearts and may be a concern for increased CHD risk.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Optical coherence tomography captures rapid hemodynamic responses to acute hypoxia in the cardiovascular system of early embryos

Jenkins

Peterson

et al. 2012

Developmental Dynamics

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“…While the diagnostic cogency of Renal Doppler ultrasonography in renal parenchymal disease (in comparison to percutaneous renal biopsy) is still under debate, recent studies have shown that the renal resistive index (RI) is correlated with tubulointerstitial lesions and vascular lesions in the kidney [ 7 – 10 ]. The renal RI is a simple parameter that is calculated as follows: [(peak systolic velocity–end diastolic velocity)/peak systolic velocity] [ 11 ]. Previous reports have shown that the renal RI is associated with the renal prognosis [ 9 , 12 – 14 ].…”

Section: Introductionmentioning

confidence: 99%

Serum cystatin C is an independent biomarker associated with the renal resistive index in patients with chronic kidney disease

et al. 2018

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Cystatin C is a cysteine protease inhibitor that is produced by nearly all human cells. The serum level of cystatin C is a stronger predictor of the renal outcome and the risk of cardiovascular events than the creatinine level. The resistive index (RI) on renal Doppler ultrasonography is a good indicator of vascular resistance as well as the renal outcomes in patients with chronic kidney disease (CKD). However, it is unclear whether serum cystatin C is associated with signs of vascular dysfunction, such as the renal RI. We measured the serum cystatin C levels in 101 CKD patients and investigated the relationships between cystatin C and markers of vascular dysfunction, including the renal RI, ankle-brachial pulse wave velocity (baPWV), intima-media thickness (IMT), and cardiac function. The renal RI was significantly correlated with the serum cystatin C level (p < 0.0001, r = 0.6920). The serum cystatin C level was found to be a significant determinant of the renal RI (p < 0.0001), but not the baPWV, in a multivariate regression analysis. The multivariate odds ratio of the serum cystatin C level for a renal RI of more than 0.66 was statistically significant (2.92, p = 0.0106). The area under the receiver-operating characteristic curve comparing the sensitivity and specificity of cystatin C for predicting an RI of more than 0.66 was 0.882 (cutoff value: 2.04 mg/L). In conclusion, the serum cystatin C level is an independent biomarker associated with the renal RI in patients with CKD.

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“…No dia de sua internação, a paciente foi avaliada e admitida ao pré-parto de acordo com a rotina estabelecida pelos protocolos dos serviços em questão. Após leitura e assinatura do Termo de Consentimento Livre Esclarecido a mesma foi submetida a ultrassom obstétrico, para avaliação dos seguintes parâmetros: biometria e peso fetal, localização e características da placenta, medida do índice de líquido amniótico de acordo com a técnica descrita por Phelan e colaboradores respectivamente (PLANIOL et al, 1974;BASKETT et al, 1976). Toda avaliação com Doppler não excedeu o tempo de 5 minutos.…”

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Análise crítica dos fatores preditores de sucesso na indução do trabalho de parto em gestações a termo

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DEDICATÓRIAS À minha esposa,Danyela, pela compreensão pelas muitas horas passadas fora de casa e pelo apoio incondicional às minhas decisões e escolhas. Aos meus pais,Wiliam e Maria Alice, pelos ensinamentos ao longo da vida, exemplos de dedicação à profissão e à família e à demonstração diária da importância da disciplina e dedicação. Aos meus irmãos,Cynthia e Paulo Henrique, Paulo e Karina, Mayra e Daniel, Neto e Natália, pelo afeto constante e por demonstrarem que existem várias maneiras de se atingir o sucesso e a satisfação naquilo que fazemos. À minha orientadora,Alessandra, pelo estímulo às atividades profissionais, por sempre querer que eu me desenvolva mais e, principalmente, pela compreensão em perceber que minha dedicação também às atividades assistenciais, de ensino e administrativas, apesar de atrasarem a conclusão da dissertação, são essenciais à minha formação profissional. AGRADECIMENTOS ESPECIAISAos meus amigos e colegas de trabalho, por sempre me incentivarem, pela compreensão e auxílio na coleta de dados, que por vezes atrapalhava o andamento de seus plantões, especialmente aos parceiros mais constantes Luiz Augusto Beltramin Martins, Flávia

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Radioisotopes, ultrasons et thermographie dans le diagnostic des troubles circulatoires cérébraux

Cited by 6 publications

References 0 publications

Optical coherence tomography captures rapid hemodynamic responses to acute hypoxia in the cardiovascular system of early embryos

Optical coherence tomography captures rapid hemodynamic responses to acute hypoxia in the cardiovascular system of early embryos

Serum cystatin C is an independent biomarker associated with the renal resistive index in patients with chronic kidney disease

Análise crítica dos fatores preditores de sucesso na indução do trabalho de parto em gestações a termo

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