Descending aortic blood flow velocity as a noninvasive measure of cardiac output in children

1994 ◽  
Vol 15 (4) ◽  
pp. 178-183 ◽  
Author(s):  
M. Seear ◽  
S. Webber ◽  
J. Leblanc
Keyword(s):  
Blood Flow ◽  
Cardiac Output ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Aortic Blood Flow ◽  
Aortic Blood ◽  
Aortic Blood Flow Velocity

Respiratory Variation in Aortic Blood Flow Velocity in Hemodynamically Unstable, Ventilated Neonates

2020 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Ignacio Oulego-Erroz ◽  
Sandra Terroba-Seara ◽  
Paula Alonso-Quintela ◽  
Antonio Rodríguez-Núñez
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Aortic Blood Flow ◽  
Respiratory Variation ◽  
Aortic Blood ◽  
Aortic Blood Flow Velocity

Doppler Measurement of Parasternal Aortic Blood Flow Velocity

2017 ◽  
Vol 49 (5S) ◽  
pp. 726
Author(s):  
Evan L. Matthews ◽  
Stephanie A. Guarino ◽  
Jennifer M. Masiddo ◽  
Peter A. Hosick
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Aortic Blood Flow ◽  
Doppler Measurement ◽  
Aortic Blood ◽  
Aortic Blood Flow Velocity

Cardiac afferents attenuate the muscle metaboreflex in the rat

1993 ◽  
Vol 75 (1) ◽  
pp. 114-120 ◽  
Author(s):  
H. L. Collins ◽  
S. E. DiCarlo
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Volume Expansion ◽  
Aortic Blood Flow ◽  
Muscle Metaboreflex ◽  
Aortic Blood ◽  
Blood Volume Expansion ◽  
Cardiac Afferents ◽  
Aortic Blood Flow Velocity

The influence of cardiac afferents on the muscle metaboreflex was examined in 16 rats instrumented with a Silastic-tipped catheter in the pericardial space and right atrium, Doppler ultrasonic flow probe and a pneumatic vascular occluder around the terminal aorta, and a Teflon catheter in the thoracic aorta. In protocol I (cardiac efferent and afferent blockade), the muscle metaboreflex was examined under three experimental conditions: 1) control, 2) cardiac autonomic efferent blockade [intrapericardial methylscopolamine (10 micrograms/kg) and propranolol (50 micrograms/kg)], and 3) combined cardiac autonomic efferent and afferent blockade (intrapericardial procainamide, 2%). In protocol II (blood volume expansion), the muscle metaboreflex was examined before and after 15% blood volume expansion. Mild treadmill exercise (9 m/min, 10% grade) increased heart rate (71 +/- 9.4 beats/min), mean arterial pressure (12 +/- 2.0 mmHg), and terminal aortic blood flow velocity (6 +/- 1.0 kHz). During exercise, a reduction of terminal aortic blood flow velocity (10.5 +/- 1.1%) reduced mixed venous PO2 18 +/- 6%. The gain of the muscle metaboreflex in the control condition was 14.6 +/- 2.9 mmHg/kHz. Efferent blockade reduced the gain 51 +/- 7%. However, combined cardiac efferent and afferent blockade increased the gain 207 +/- 64% above the efferent blocked condition and restored the gain to levels above those obtained in the control condition (18.3 +/- 4.6 mmHg/kHz). In addition, 15% blood volume expansion reduced the gain of the muscle metaboreflex regulation of mean arterial pressure and heart rate (44 +/- 9.5% and 41 +/- 12.0%, respectively). Thus cardiac afferents tonically inhibit the pressor response to a reduction in terminal aortic blood flow velocity during exercise.

Aortic blood flow velocity during Wenckebach periods in man

1971 ◽  
Vol 82 (6) ◽  
pp. 796-801 ◽  
Author(s):  
Alberto Benchimol ◽  
Kenneth B. Desser ◽  
John L. Gartlan
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Aortic Blood Flow ◽  
Aortic Blood ◽  
Aortic Blood Flow Velocity
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