scholarly journals Intra-ventricular Pressure Gradient and Systolic Anterior Movement of the Mitral Valve Associated with Administration of Dopamine in a 91-year-old Patient.

1994 ◽  
Vol 31 (3) ◽  
pp. 244-248
Author(s):  
Hideki Okayama ◽  
Mareomi Hamada ◽  
Yuji Shigematsu ◽  
Mitsunori Abe ◽  
Mikio Mukai ◽  
...  
Keyword(s):  
Mitral Valve ◽  
Pressure Gradient ◽  
Ventricular Pressure ◽  
Systolic Anterior Movement

Single-Center Experience with Adjustable Annuloplasty Ring in Degenerative Mitral Regurgitation

2015 ◽  
Vol 10 (4) ◽  
pp. 248-251 ◽  
Author(s):  
Markus Czesla ◽  
Julia Götte ◽  
Vladimir Voth ◽  
Nicolas Doll
Keyword(s):  
Mitral Valve ◽  
Mitral Regurgitation ◽  
Surgical Repair ◽  
Fine Tuning ◽  
Single Center ◽  
Annuloplasty Ring ◽  
Single Center Experience ◽  
Complex Anatomy ◽  
Repair Procedure ◽  
Systolic Anterior Movement

Objective Owing to the complex anatomy of the mitral valve, successful surgical repair of degenerative regurgitation remains a challenging procedure in cardiac surgery. Methods This paper aimed to report on our single-center experience with 20 patients who received an adjustable annuloplasty ring (Cardinal ring, ValtechCardio Ltd, Or Yehuda, Israel) as part of their mitral valve repair procedure. The device allows for intraoperative echocardiography-guided ring size adjustments under beating-heart conditions. Results All of the 20 patients left the operating room without any residual mitral regurgitation. There was no risk of systolic anterior movement (SAM) because of image-guided fine tuning of the ring before weaning the patient from bypass. Conclusions Further multicenter data are required to prove the concept of adjustable annuloplasty devices.

New Stent for Transapical Mitral Valve Replacement in Acute Swine Experiment

2020 ◽  
Author(s):  
Yu Zou ◽  
Peng Teng ◽  
Liang Ma
Keyword(s):  
Mitral Valve ◽  
Pressure Gradient ◽  
Valve Replacement ◽  
Mitral Valve Replacement ◽  
Mitral Annulus ◽  
The Self ◽  
Purse String ◽  
Transcatheter Mitral Valve Replacement ◽  
Before And After ◽  
The Mean

Abstract Background: Many patients with mitral regurgitation are denied open-heart surgery due to high risk. Transcatheter mitral valve replacement offers an alternative treatment. This study aimed to test the feasibility of a new self-expanding valved stent for transcatheter mitral valve replacement via apex in an acute animal model.Methods: Eight porcine experiments were performed in the acute study. A left thoracotomy was performed. The new self-expanding transcatheter valved stent was deployed under fluoroscopic guidance within the native mitral annulus via apex. Hemodynamic data, before and after implantation, were recorded. Mitral annulus diameter and valve area were measured using echocardiography. Transvalvular and left ventricular outflow tract pressure gradient were measured invasively. Results: Seven animals underwent successful transapical mitral valve replacement; the implantation was unsuccessful in one animal. The mean procedure time, defined from placing the purse-string to tightening the purse-string, was 17.14 ± 7.86 min. Hemodynamic data before and after transapical mitral valve replacement showed no difference in statistical analysis. The mean diameter and mean functional area of the self-expanding device after implantation were 2.58 ± 1.04 cm and 2.70 ± 0.26 cm2, respectively. Trace to mild central and paravalvular leak was detected in 7 valves. Mean pressure gradient across the self-expanding device was 2.00 ± 0.82 mm Hg; the corresponding gradients across the LVOT were 3.28± 1.11 mm Hg. Postmortem examinations confirmed precise device positioning in 7 animals with no signs of LVOT obstruction.Conclusion: Transcatheter mitral replacement of the new valved stent was confirmed feasible in acute preclinical models. The new stent reveals optimal design parameters.

Estimation of mitral valve area from regression analysis of the pressure gradient in mitral stenosis

1992 ◽  
Vol 69 (12) ◽  
pp. 1050-1055
Author(s):  
John A. Bittl ◽  
Alan C. Yeung ◽  
Vladimir Vekshtein ◽  
John D. Parker ◽  
R.David Fish
Keyword(s):  
Regression Analysis ◽  
Mitral Valve ◽  
Pressure Gradient ◽  
Mitral Stenosis ◽  
Mitral Valve Area ◽  
Valve Area

Systolic pressure gradients across the aortic valve and in the ascending aorta

1965 ◽  
Vol 209 (3) ◽  
pp. 557-563 ◽  
Author(s):  
Thomas E. Driscol ◽  
Richard W. Eckstein
Keyword(s):  
Aortic Valve ◽  
Pressure Gradient ◽  
Systolic Pressure ◽  
Left Ventricular Pressure ◽  
Aortic Pressure ◽  
Left Ventricular ◽  
Ventricular Pressure ◽  
Maximum Pressure ◽  
Early Systole ◽  
Systolic Pressure Gradient

Left ventricular and aortic pressure pulses and the pressure gradient across the aortic valve were recorded in anesthetized and unanesthetized dogs. Aortic pressure recorded immediately above the valve increased 5–15 msec before it was exceeded by left ventricular pressure. The maximum systolic pressure gradient occurred in early systole and remained positive throughout the ejection period. When aortic pressure was recorded 1–3 cm distal to the valve, these pressure pulse relationships were altered so that 1) the rise in aortic pressure was delayed, 2) the early systolic maximum pressure gradient was increased, and 3) aortic pressure exceeded ventricular pressure during the latter half of systole. The changes in early systole are due to a delay in the pulse wave reaching the more distal recording site. The mean systolic pressure gradient between two sites within the ascend-ing aorta was found to be negative, i.e., opposite to the direction of forward flow. The negative pressure gradient probably accounts for the reversal of the transvalvular pressure gradient in late systole when aortic pressure was recorded distal to the valve.

Sign in / Sign up

Export Citation Format

Share Document