Modified doppler flowmetry in the splanchnic circulation

Hipertensão portal por esquistossomose mansônica hepatoesplênica: efeito da desconexão ázigo-portal com esplenectomia no diâmetro e na velocidade média de fluxo do sistema portal (estudo ultra-sonográfico com Doppler)

“…Desde sua introdução na prática médica, este exame tem sido utilizado para o estudo de várias doenças hepáticas e para criar índices que traduzissem as condições circulatórias do fígado (1,6,8,11,12,15,16,23,24,26) . Progressivamente, dificuldades relacionadas ao método foram sendo reconhecidas e equacionadas para que esta técnica pudesse ser utilizada eficientemente no estudo deste sistema vascular (3,7,20,22,27,28) . Sua importância no estudo da síndrome hipertensiva portal ficou estabelecida quando, apesar das dificuldades inerentes ao método, foi avaliado o prognóstico de pacientes com cirrose hepática (2,8,9,10,11,12,13,17,18,25,26,29,30) .…”

Mesenteric blood flow is related to disease activity and risk of relapse in ulcerative colitis: a prospective follow up study

“…Although the precision of absolute measurements of flow rate is probably limited, estimation of short term changes in flow is quite reliable,4 5 even if a relevant interobserver variability is considered 67 Analysis of postprandial hyperaemia has been found to be superior to baseline measurements in the assessment of postprandial abdominal pain8 and portal hypertension 9.…”

Doppler Ultrasonographic Evaluation of Gastrointestinal Hemodynamics in Food Hypersensitivities: A Canine Model

“…Pulsed spectral Doppler was used to trace the flow in each vessel with a sampling gate size of 2 mm. 30 Measurements were made approximately 2 cm from the vessel origin to avoid potential influences by turbulence and vortex shedding produced at sharp turns, such as the origin of the CMA and CA from the aorta. 31 The peak systolic velocity (PSV), the end-diastolic velocity (EDV), and the mean velocity (MV) of 5 waveforms from each vessel at each time point were calculated by the ultrasound computer via automated tracing.…”

“…The resistive index (RI ϭ (PSV Ϫ EDV)/PSV) and the pulsatility index (PI ϭ (PSV Ϫ EDV)/MV) were calculated and the mean of 5 waveforms was used for further analysis. 30 The percentage deviation from t 0 for RI and PI was calculated for each time point and for each diet. 22,25…”