1/5/2024 0 Comments Carotid pulse![]() Effect of prone positioning systems on hemodynamic and cardiac function during lumbar spine surgery: an echocardiographic study. 10 Dharmavaram S, Jellish WS, Nockels RP, Shea J, Mehmood R, Ghanayem A, Kleinman B, Jacobs W.Cardiac and arterial hypertrophy and atherosclerosis in hypertension. 9 Devereux RB, Roman MJ, Ganau A, de Simone G, Okin PM, Kligfield P.Continuous monitoring of an endocardial index of myocardial contractility during head-up tilt test. 8 Deharo JC, Peyre JP, Chalvidan T, Thirion X, Valli M, Ritter P, Djiane P.Evidence of a dominant backward-propagating “suction” wave responsible for diastolic coronary filling in humans, attenuated in left ventricular hypertrophy. 7 Davies JE, Whinnett ZI, Francis DP, Manisty CH, Aguado-Sierra J, Willson K, Foale RA, Malik IS, Hughes AD, Parker KH, Mayet J.Haemodynamic responses during head-up tilt and tilt reversal in two groups with chronic autonomic failure: pure autonomic failure and multiple system atrophy. An integrated system for the non-invasive assessment of vessel wall and hemodynamic properties of large arteries by means of ultrasound. 5 Brands PJ, Hoeks AP, Willigers J, Willekes C, Reneman RS.A radio frequency domain complex cross-correlation model to estimate blood flow velocity and tissue motion by means of ultrasound. 4 Brands PJ, Hoeks AP, Ledoux LA, Reneman RS.Common carotid artery stiffness and patterns of left ventricular hypertrophy in hypertensive patients. 3 Boutouyrie P, Laurent S, Girerd X, Benetos A, Lacolley P, Abergel E, Safar M.In vivo/in vitro comparison of rat abdominal aorta wall viscosity. 2 Boutouyrie P, Bezie Y, Lacolley P, Challande P, Chamiot-Clerc P, Benetos A, de la Faverie JF, Safar M, Laurent S.A Doppler-derived index of combined left ventricular systolic and diastolic function is an independent predictor of cardiovascular mortality in elderly men. 1 Arnlov J, Lind L, Andren B, Riserus U, Berglund L, Lithell H. ![]() We conclude that CA ultrasound and pulse wave analysis enable noninvasive quantification of ventriculoarterial responses to changes in posture. These results suggest that orthostasis decreases left ventricular output as a result of arterial wave reflections and, presumably, reduced cardiac preload. ICP increased by 7 ± 7 ms ( P < 0.001), the ICP-to-EP ratio increased from 14 ± 3% (supine) to 19 ± 3% ( P < 0.001) and the DBP-to-ICP ratio decreased by 7% ( P = 0.023). Shortening of EP was significantly correlated to earlier arrival of the lower body peripheral reflection wave ( r 2 = 0.46, P < 0.001). Compared with the supine position, in the sitting position diastolic blood pressure (DBP) increased by 7 ± 4 mmHg ( P < 0.001) and R-R interval decreased by 49 ± 82 ms ( P = 0.013), reflecting normal baroreflex response, whereas EP decreased to 267 ± 19 ms ( P < 0.001). The algorithm enabled determination of isovolumic contraction period (ICP) and ejection period (EP): ICP = 43 ± 8 (SD) ms (4-ms precision), and EP = 302 ± 16 (SD) ms (5-ms precision). Pulse wave analysis was based on a timing extraction algorithm that automatically detects acceleration maxima in the second derivative of the CA pulse waveform. ECG, brachial cuff pressure, and common CA diameter waveforms (by M-mode ultrasound) were obtained in 21 healthy volunteers (19–30 yr of age, 10 men and 11 women) in supine and sitting positions. We investigated posture-related changes in ventriculoarterial hemodynamics by means of carotid artery (CA) pulse wave analysis. Central blood pressure waveforms contain specific features related to cardiac and arterial function.
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