PMID: 9434703Jan 22, 1998Paper

Flow velocity of central retinal artery and retrobulbar vessels during cardiovascular operations

The Journal of Thoracic and Cardiovascular Surgery
Kazumasa OrihashiKenji Okada

Abstract

Both blood flow monitoring and pressure monitoring are necessary to avoid inadequate cerebral perfusion during cardiovascular operations. Inasmuch as transcranial Doppler ultrasonography does not provide a consistently good signal, especially during cardiopulmonary bypass, we examined the blood flow through the central retinal artery, which has proved to reflect an obstruction of the carotid artery. Twenty-eight consecutive cases were examined with a 5 or 7.5 MHz conventional echocardiographic probe. Correlation between the maximal velocity at the central retinal artery and systolic blood pressure was examined. The blood flow of the central retinal artery and retrobulbar vessels was examined during selective or retrograde cerebral perfusion or intraaortic balloon pumping. Blood flow could be clearly visualized but disappeared below a certain pressure in every case. With data from 478 measuring points, systolic blood pressure correlated with maximal velocity (r = 0.6902, p < 0.0001). The blood pressure-axis intercept, known as "critical closing pressure," was 35.8 +/- 14.8 mm Hg, varying among individuals and bilateral eyes. Pulsatility index increased after cardiopulmonary bypass (1.095 +/- 0.245 to 1.525 +/- 0.268, p < 0.0001)...Continue Reading

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Citations

Mar 10, 2001·The Annals of Thoracic Surgery·K OrihashiK Okada
Jan 6, 2000·Journal of Cardiothoracic and Vascular Anesthesia·P VociQ Caretta
Jul 18, 2012·Journal of Cardiovascular Medicine·Emanuele CatenaAmando Gamba
Jul 22, 2011·Anesthesiology Research and Practice·Deborah K HarringtonRobert S Bonser
Apr 9, 2013·The Annals of Thoracic Surgery·Kazumasa Orihashi
May 4, 2010·Heart Rhythm : the Official Journal of the Heart Rhythm Society·Behzad B PavriJames McBride
Feb 7, 2006·Journal of Cardiothoracic and Vascular Anesthesia·Kazumasa OrihashiKatsuhiko Imai
Mar 27, 2007·Journal of Nippon Medical School = Nippon Ika Daigaku Zasshi·Seiji MiiAtsuhiro Sakamoto
Jun 21, 2016·Journal of Cardiothoracic and Vascular Anesthesia·Hironobu HayashiMasahiko Kawaguchi
Aug 30, 2000·The Journal of Thoracic and Cardiovascular Surgery·K OrihashiO Ishii
Nov 4, 2016·Surgery Today·Kazumasa Orihashi
Feb 9, 2020·Journal of Clinical Monitoring and Computing·Yasushi MotoyamaHiroyuki Nakase
Apr 26, 2021·World Neurosurgery·Dmitriy Viderman, Yerkin G Abdildin
May 6, 2019·The Journal of Thoracic and Cardiovascular Surgery·Nobuo KondoKazumasa Orihashi

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