The Accuracy of Measurement of Cardiac Output and Muscle Perfusion in Man by Ultrafast Computed Tomography

1993 ◽  
Vol 85 (s29) ◽  
pp. 38P-38P
Author(s):  
P F Ludman ◽  
A J S Coats ◽  
S R Underwood ◽  
R S O Rees ◽  
P A Poole-Wilson
Keyword(s):  
Computed Tomography ◽  
Cardiac Output ◽  
Muscle Perfusion ◽  
Accuracy Of Measurement ◽  
Ultrafast Computed Tomography

Reproducibility of the measurement of coronary calcium with ultrafast computed tomography

1995 ◽  
Vol 75 (14) ◽  
pp. 973-975 ◽  
Author(s):  
Stephen Devries ◽  
Christopher Wolfkiel ◽  
Vijay Shah ◽  
Eva Chomka ◽  
Stuart Rich
Keyword(s):  
Computed Tomography ◽  
Coronary Calcium ◽  
Ultrafast Computed Tomography

scholarly journals Augmentation of Electrocardiographic QRS R-Amplitude Precedes Radiocontrast-Induced Hypotension during Mobile Computed Tomography Scanning

2019 ◽  
Vol 8 (4) ◽  
pp. 505
Author(s):  
Hye-Mee Kwon ◽  
Sung-Hoon Kim ◽  
Hee-Sun Park ◽  
Yong-Seok Park ◽  
Young-Jin Moon ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cardiac Output ◽  
Systemic Vascular Resistance ◽  
Vascular Resistance ◽  
Adverse Reactions ◽  
Artery Aneurysm ◽  
Ct Scanning ◽  
Hemodynamic Changes ◽  
Computed Tomography Scanning ◽  
Mobile Ct

Although intravenous administration of contrast media may trigger a variety of adverse reactions, sedated patients undergoing computed tomography (CT) scanning usually are not able to report their symptoms, which may delay detection of adverse reactions. Furthermore, changes in vital signs cannot be typically measured during mobile CT scanning, which worsens the situation. We aimed to characterize contrast-related hemodynamic changes that occur during mobile CT scanning and predict sudden hypotension based on subtle but robust changes in the electrocardiogram (ECG). We analyzed the digitized hemodynamic data of 20 consecutive patients who underwent clipping of a cerebral artery aneurysm and contrast-enhanced CT scanning following the surgical procedure. Hemodynamic variables, including ECG findings, invasive blood pressure (BP), pulse oximetry results, capnography findings, cardiac output, and systemic vascular resistance, were monitored simultaneously. We measured morphological changes in ECG-derived parameters, including the R–R interval, ST height, and QRS R-amplitude, on a beat-to-beat basis, and evaluated the correlation between those parameters and hemodynamic changes. After the radiocontrast injection, systolic BP decreased by a median 53 mmHg from baseline and spontaneously recovered after 63 ± 19 s. An increase in QRS R-amplitude (median 0.43 mV) occurred 25 ± 10 s before hypotension developed. The receiver operating characteristic curve showed that a 16% increase in QRS R-amplitude can predict a decrease in systolic BP of >25% (area under the curve 0.852). Increased cardiac output (median delta 2.7 L/min from baseline) and decreased systemic vascular resistance (median delta 857 dyn·s/cm5 from baseline) were also observed during hypotension. During mobile CT scanning, profound but transient hypotension can be observed, associated with decreased vascular resistance. Augmentation of QRS R-amplitude from an ECG represents a sensitive surrogate for onset of a hypotensive episode after contrast injection, thereby serving as a simple and continuous noninvasive hemodynamic monitoring tool.

Clinical Applications of Ultrafast Computed Tomography

1989 ◽  
Vol 6 (1) ◽  
pp. 87-97
Author(s):  
MELVIN L. MARCUS ◽  
WILLIAM STANFORD ◽  
JOHN A. RUMBERGER ◽  
STEVEN J. REITER ◽  
ANDREW J. FEIRING ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Clinical Applications ◽  
Ultrafast Computed Tomography

scholarly journals Use of ultrafast computed tomography to quantitate regional myocardial perfusion: A preliminary report

1987 ◽  
Vol 9 (1) ◽  
pp. 59-69 ◽  
Author(s):  
John A. Rumberger ◽  
Andrew J. Feiring ◽  
Martin J. Lipton ◽  
Charles B. Higgins ◽  
Stephen R. Ell ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Myocardial Perfusion ◽  
Preliminary Report ◽  
Regional Myocardial Perfusion ◽  
Ultrafast Computed Tomography

Systolic and diastolic performance in normal human subjects as measured by ultrafast computed tomography

1988 ◽  
Vol 15 (4) ◽  
pp. 277-283 ◽  
Author(s):  
Joseph D. Wachspress ◽  
Neil R. Clark ◽  
William J. Untereker ◽  
Barbara T. Kraushaar ◽  
Peter B. Kurnik
Keyword(s):  
Computed Tomography ◽  
Human Subjects ◽  
Normal Human ◽  
Ultrafast Computed Tomography

Determination of cardiac output with dynamic contrast-enhanced computed tomography

2013 ◽  
Vol 29 (8) ◽  
pp. 1871-1878 ◽  
Author(s):  
Michael Pienn ◽  
Gabor Kovacs ◽  
Maria Tscherner ◽  
Thorsten R. Johnson ◽  
Peter Kullnig ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cardiac Output ◽  
Dynamic Contrast Enhanced ◽  
Contrast Enhanced ◽  
Enhanced Computed Tomography ◽  
Contrast Enhanced Computed Tomography

scholarly journals Measurement of myocardial blood flow by ultrafast computed tomography.

Circulation ◽  
1987 ◽  
Vol 76 (6) ◽  
pp. 1262-1273 ◽  
Author(s):  
C J Wolfkiel ◽  
J L Ferguson ◽  
E V Chomka ◽  
W R Law ◽  
I N Labin ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Blood Flow ◽  
Myocardial Blood Flow ◽  
Ultrafast Computed Tomography
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