References
- Myers JD, JapeTaylor W. An estimation of portal venous pressure by occlusive catherization of an hepatic venule. J Clin Invest 1951;30:662–3.
- Garcia-Tsao G, Groszmann RJ, Fisher RL, Conn HO, Atterbury CE, Glickman M. Portal pressure, presence of gastroesophageal varices and variceal bleeding. Hepatology 1985;5:419–24.
- Merkel C, Sacerdoti D, Bolognesi M, Bombonato G, Gatta A. Doppler sonography and hepatic vein catheterization in portal hypertension: assessment of agreement in evaluating severity and response to treatment. J Hepatol 1998;28:622–30.
- Sabbá C, Weltin GG, Cicchetti DV, Ferraioli G, Taylor KJW, Nakamura T, et al. Observer variability in echo-Doppler measurements of portal flow in cirrhotic patients and normal volunteers. Gastroenterology 1990;98:1603–11.
- de Vries PJ, van Hattum J, Hoekstra JB, de Hooge P. Duplex Doppler measurements of portal venous flow in normal subjects. Inter- and intra-observer variability. J Hepatol 1991;13:358–63.
- Sabba C, Merkel C, Zoli M, Ferraioli G, Gaiani S, Sacerdoti D, et al. Interobserver and interequipment variability of echoDoppler examination of the portal vein: effect of a cooperative training program. Hepatology 1995;21:28–33.
- Laustsen J, Pedersen EM, Terp K, Steinbrüchel D, Paulsen PK, Jørgensen H, et al. Validation of a new transit time ultrasound flowmeter in man. Eur J Endovasc Surg 1996;12:91–6.
- Jakab F, Rath Z, Nagy P, Faller J. The interaction between hepatic arterial and portal venous blood flows; simultaneous measurement by transit time ultrasonic volume flowmetry. Hepatogastroenterology 1996;42:18–21.
- Doi R, Inoue K, Kogire M, Sumi S, Takaori K, Suzuki T, et al. Simultaneous measurement of hepatic arterial and portal venous flows by transit time ultrasonic volume flowmetry. Surg Gynecol Obstet 1988;167:65–9.
- Caletti GC, Brocchi E, Ferrari A, Fiorino S, Barbara L. Value of endoscopic ultrasonography in the management of portal hypertension. Endoscopy 1992;24 Suppl 1:342–6.
- Wiersema MJ, Chak A, Kopecky KK, Wiersema LM. Duplex Doppler endosonography in the diagnosis of splenic vein, portal vein, and portosystemic shunt thrombosis. Gastrointest Endosc 1995;42:19–26.
- Barnes RJ, Comline RS, Dobson A, Drost CJ. An implantable transit time ultrasonic blood flow meter. J Physiol 1983;345:2–3.
- D’Almeida MS, Gaudin C, Lebrec D. Validation of 1- and 2-mmtransit-time ultrasound flow probes on mesenteric artery and aorta of rats. Am J Physiol 1995;268(3 Pt 2):H1368–72.
- Lundell A, Bergqvist D, Mattsson E, Nilsson B. Volume blood flow measurements with a transit time flowmeter: an in vivo and in vitro variability and validation study. Clin Physiol 1993; 13(5):547–57.
- Bland JM, Altman DG. Statistical methods for assessing agreement between two methods of clinical measurement. Lancet 1986;1:307–10.
- Gill RW. Measurement of blood flow by ultrasound: accuracy and sources of error. Ultrasound Med Biol 1985;11:625–41.
- Zironi G, Gaiani S, Fenyves D, Rigamonti A, Bolondi L, Barbara L. Value of measurement of mean portal flow velocity by Doppler flowmetry in the diagnosis of portal hypertension. J Hepatol 1992;16:298–303.
- Zoli M, Iervese T, Abbati S, Bianchi GP, Marchesini G, Pisi E. Portal blood velocity and flow in aging man. Gerontology 1989;35:61–5.
- Burns P, Taylor KJV, Blei AT. Doppler flowmetry and portal hypertension. Gastroenterology 1987;92:824–6.
- Bolognesi M, Sacerdoti D, Merkel C, Bombonato G, Enzo E, Gatta A. Effects of chronic therapy with nadolol on portal hemodynamics and on splanchnic impedance indices using Doppler sonography: comparison between acute and chronic effects. J Hepatol 1997;26:305–11.
- Iwao T, Toyonaga A, Shigemori H, Oho K, Sumino M, Sato M, et al. Echo-Doppler measurements of portal vein and superior mesenteric artery blood flow in humans: inter- and intraobserver short-term reproducibility. J Gastroenterol Hepatol 1996;11:40–6.
- Salama ZA, Kassem AM, Giovannini M, Hunter MS. Endoscopic ultrasonographic study of the azygos vein in patients with varices. Endoscopy 1997;29:748–50.