Congenital unguarded mitral orifice

2020 ◽  
Author(s):  
Keyword(s):  
Mitral Orifice

scholarly journals Intimal Sarcoma: An Extremely Rare Case of a Left Atrial Tumor with Partial Obstruction of the Mitral Orifice

CASE ◽  
2021 ◽  
Author(s):  
Tamami Nakagawa-Kamiya ◽  
Mika Mori ◽  
Miho Ohira ◽  
Kenji Iino ◽  
Masa-aki Kawashiri ◽  
...  
Keyword(s):  
Left Atrial ◽  
Rare Case ◽  
Partial Obstruction ◽  
Intimal Sarcoma ◽  
Mitral Orifice ◽  
Left Atrial Tumor ◽  
Atrial Tumor

Complications of the Mustard Operation

1986 ◽  
Vol 8 (4) ◽  
pp. 106-126
Keyword(s):  
Heart Block ◽  
Normal Sinus Rhythm ◽  
Venous Blood ◽  
Resting Heart Rate ◽  
Normal Sinus ◽  
Mustard Operation ◽  
Mitral Orifice ◽  
The Mean ◽  
Degree Heart Block

Eight pediatric cardiac centers pooled clinical and ECG data from 372 patients who survived the Mustard operation (intraatrial baffle directing pulmonary venous blood to the tricuspid orifice and systemic venous blood to the mitral orifice) for at least 3 months. The follow-up period ranged from 0.4 to 15.9 years, and the mean age at operation was 2 years. The mean resting heart rate for patients who had the Mustard operation was consistently lower than age-matched controls. During the year of operation, 76% of patients had normal sinus rhythm; this percentage declined yearly to 57% by the end of the eighth postoperative year. Active arrhythmias increased after the tenth year. Second or third-degree heart block occurred in 33% of patients during the year of operation and changed very little thereafter. Of the total 372 patients, 39 received pacemakers, 52% during the year of surgery and 48% evenly distributed throughout the follow-up period.

Reflex effects of left atrial pressure elevation on total intravascular volume

1981 ◽  
Vol 241 (5) ◽  
pp. H760-H765 ◽  
Author(s):  
D. L. Rutlen
Keyword(s):  
Left Atrial ◽  
Atrial Pressure ◽  
Left Atrial Pressure ◽  
Intravascular Volume ◽  
Pressure Elevation ◽  
Reservoir Volume ◽  
Baroreceptor Stimulation ◽  
Mitral Orifice ◽  
Autonomic Reflex ◽  
The Right

The reflex autonomic influence of left atrial baroreceptor stimulation on the total capacitance vasculature has not been examined. To this end, left atrial pressure was increased in 25 anesthetized dogs, in which blood from the vena cavae was drained into an extracorporeal reservoir and returned to the right atrium at a constant rate, so that changes in intravascular volume could be recorded as reciprocal changes in reservoir volume. Left atrial pressure was elevated from 5 +/- 1 (mean +/- SE) to 11 +/- 1 mmHg by inflating a balloon at the mitral orifice for 12-20 min. With left atrial pressure elevation, total intravascular volume decreased 25 +/- 10 ml (P less than 0.025). In six of the dogs, intravascular volume decreased 37 +/- 12 ml with left atrial pressure elevation before bilateral cervical vagectomies and increased 66 +/- 8 ml with atrial pressure elevation after vagectomies (P less than 0.001). In eight of the dogs, volume decreased 42 +/- 19 ml with atrial pressure elevation before propranolol administration and increased 44 +/- 29 ml after propranolol (P less than 0.03). Phenoxybenzamine in five of the animals and atropine in three did not attenuate the change in intravascular volume with left atrial pressure elevation. Thus left atrial baroreceptor stimulation is associated with an autonomic reflex, which acts to decrease intravascular volume. The afferent limb is mediated by the vagi, and the efferent limb, by beta-adrenergic receptor stimulation.

A Theoretical Description of Blood Flow Through the Mitral Orifice

1989 ◽  
Vol 111 (2) ◽  
pp. 141-146 ◽  
Author(s):  
D. M. Bakalyar ◽  
A. M. Hauser ◽  
G. C. Timmis
Keyword(s):  
Blood Flow ◽  
Velocity Profile ◽  
Theoretical Description ◽  
Doppler Velocity ◽  
Comprehensive Model ◽  
Orifice Area ◽  
Ventricular Mechanics ◽  
Straight Line ◽  
Mitral Orifice ◽  
Flow Through

A nonlinear differential equation describing the Doppler velocity profile for blood flow through the mitral valve has been derived. This equation is based on fluid dynamics and a simple, but comprehensive model of atrial and ventricular mechanics. A numerical solution to the equation is described and provides excellent agreement with Doppler velocity curves obtained clinically. One important result of the theory is that in patients with mitral stenosis, the slope of the clinically observed straight-line descent of the velocity profile is proportional to the mitral orifice area and inversely proportional to the atrioventricular compliance.

NONINVASIVE ASSESSMENT OF LEFT VENTRICULAR DIASTOLIC FUNCTION BY COLOR M-MODE DOPPLER ECHOCARDIOGRAPHY

2001 ◽  
Vol 01 (02) ◽  
pp. 97-105
Author(s):  
AKIRA KITABATAKE ◽  
KEIKO NISHIHARA ◽  
HISAO ONOZUKA ◽  
KAZUSHI URASAWA ◽  
TAISEI MIKAMI
Keyword(s):  
Diastolic Function ◽  
Flow Pattern ◽  
Left Ventricular Diastolic Function ◽  
Left Ventricular ◽  
Function Parameter ◽  
Transmitral Flow ◽  
Baseline Shift ◽  
Mitral Orifice ◽  
Flow Propagation Velocity ◽  
Flow Propagation

Transmitral flow velocity pattern obtained by pulsed Doppler technique reflects left ventricular (LV)diastolic function, but an increase in left atrial pressure pseudo-normalizes the flow pattern and masks diastolic dysfunction. Flow propagation velocity (FPV) measured, using color M-mode Doppler and baseline-shift technique, represents an average velocity of early diastolic LV filling flow from mitral orifice to mid-ventricle. In patients with ischemic heart disease and dilated cardiomyopathy, including those with pseudonormalized transmitral flow pattern, FPV had good correlation with the time constant of early diastolic LV pressure decay (Tau), indicating that FPV is a useful noninvasive diastolic-function parameter which does not pseudo-normalize. Unlike the conventional Doppler parameters, FPV was well correlated with Tau in patients with hypertrophic cardiomyopathy, and was distinctly decreased even in hypertensive patents without LV hypertrophy. Thus, FPV is a unique noninvasive diastolic parameter, which can sensitively and accurately detect LV diastolic impairment.

Crossing of mitral orifice with the Inoue balloon: The “straight-balloon” technique

1996 ◽  
Vol 37 (2) ◽  
pp. 231-232 ◽  
Author(s):  
Tejas M. Patel ◽  
Sameer I. Dani ◽  
Milan C. Chag ◽  
Sanjay C. Shah ◽  
Urmil G. Shah ◽  
...  
Keyword(s):  
Mitral Orifice ◽  
Balloon Technique ◽  
Inoue Balloon

Unguarded mitral orifice, mirror-imaged atrial arrangement, and discordant atrioventricular connections

1999 ◽  
Vol 9 (5) ◽  
pp. 478-483 ◽  
Author(s):  
Satoshi Yasukochi ◽  
Gengi Satomi ◽  
Insam Park ◽  
Masahiko Ando ◽  
Kazuo Momma
Keyword(s):  
Left Ventricle ◽  
Right Ventricle ◽  
Double Outlet Right Ventricle ◽  
Cardiac Malformation ◽  
Atrioventricular Junction ◽  
Mitral Orifice ◽  
Pulmonary Valvar Stenosis

AbstractWe report two autopsy proven cases of unguarded mitral orifice associated with mirror-imaged atrial arrangement, discordant atrioventricular connections, double outlet right ventricle, pulmonary valvar stenosis or atresia, and atrialisation of the morphologically left ventricle. The morphologically left atrioventricular junction was devoid of valvar leaflets, and there was no tension apparatus within the ventricle. To the best of our knowledge, this is the first description of this rare cardiac malformation

The Surgical Repair of Duplication of the Mitral Orifice

1970 ◽  
Vol 9 (1) ◽  
pp. 81-85 ◽  
Author(s):  
George E. Reed ◽  
Luis E. Cortes ◽  
Roy H. Clauss ◽  
Edmund H. Reppert
Keyword(s):  
Surgical Repair ◽  
Mitral Orifice
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