scholarly journals Acute pressure overload of the right ventricle. Comparison of two models of right-left shunt. Pulmonary artery to left atrium and right atrium to left atrium: experimental study

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Mihalis Argiriou ◽  
Dimitrios Mikroulis ◽  
Timothy Sakellaridis ◽  
Vasilios Didilis ◽  
Apostolos Papalois ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pulmonary Artery ◽  
Right Ventricle ◽  
Left Atrium ◽  
Right Atrium ◽  
Pressure Overload ◽  
The Right

scholarly journals Pulmonary artery banding alters the expression of Ca2+ transport proteins in the right atrium in rabbits

2009 ◽  
Vol 296 (6) ◽  
pp. H1933-H1939 ◽  
Author(s):  
Subash C. Gupta ◽  
Kenneth D. Varian ◽  
Naresh C. Bal ◽  
Jessica L. Abraham ◽  
Muthu Periasamy ◽  
...  
Keyword(s):  
Pulmonary Artery ◽  
Right Ventricle ◽  
Right Ventricular ◽  
Right Atrium ◽  
Contractile Function ◽  
Pressure Overload ◽  
Transport Proteins ◽  
Pulmonary Artery Banding ◽  
Plasmic Reticulum ◽  
The Right

Following pulmonary artery banding (PAB), the contractile function of right ventricle diminishes over time. Subsequently, the right atrium (RA) has to contract against a higher afterload, but it is unknown to what extent ventricular dysfunction has an effect on the atrial contractility. We hypothesized that right ventricular pressure overload may have an affect on atrial contractility and Ca2+ transport protein expression. Therefore, we induced pressure overload of the right ventricle by PAB for 10 wk in rabbits and examined the changes in the expression of Ca2+ transport proteins in the atrium. We demonstrate that PAB significantly decreased the expression of sarco(endo)plasmic reticulum Ca2+-ATPase (Serca) 2a while expression of Na+/Ca2+ exchanger-1 was significantly upregulated in the RA but not in the left atria of rabbit hearts, indicating that pressure is the major trigger. A decrease in Serca2a expression was concomitant with a significant decrease in sarcolipin (SLN), possibly indicating a compensatory role of SLN. The decreased expression of SLN was unable to completely restore sarcoplasmic reticulum Ca2+ uptake function of Serca2a. Functional contractile assessments in isolated trabeculae showed no difference between PAB- and sham-operated rabbits at 1 Hz but displayed an enhanced force development at higher frequencies and in the presence of isoproterenol, while twitch timing was unaffected. Our results indicate that right ventricular mechanical overload due to PAB affects the expression of the Ca2+-handling proteins in the RA in rabbits.

scholarly journals P686 Right atrial, right ventricular and pulmonary cement embolism: a rare complication of percutaneous vertebroplasty

2020 ◽  
Vol 21 (Supplement_1) ◽  
Author(s):  
S Akhunova ◽  
R Khayrullin ◽  
N Stekolshchikova ◽  
M Samigullin ◽  
V Padiryakov
Keyword(s):  
Pulmonary Artery ◽  
Right Ventricle ◽  
Right Atrium ◽  
Percutaneous Vertebroplasty ◽  
Rare Complication ◽  
Clinical Manifestations ◽  
Stable Condition ◽  
Right Atrial ◽  
Cement Embolism ◽  
The Right

Abstract A 68-year-old man was admitted to the hospital with complaints of pain in the lumbar spine. He had L5 disc herniation, Spinal stenosis of the L5 root canal - S1 on the right in the past medical history. Percutaneous vertebroplasty at the level of L3 and Th8 vertebral bodies was performed six months ago due to painful vertebral hemangioma. The man is suffering from arterial hypertension, receives antihypertensive therapy. During routine transthoracic echocardiography, a hyperechoic structure with a size of 9.5 x 0.9 cm was found in the right atrium and right ventricle. Chest computed tomography with contrast enhancement revealed signs of bone cement in the right atrium and right ventricle, in the right upper lobe artery, in the branches of the upper lobe artery, in the paravertebral venous plexuses. Considering the duration of the disease, the stable condition, the absence of clinical manifestations and disorders of intracardiac hemodynamics, it was decided to refrain from surgical treatment. Antiplatelet therapy and dynamic observation were recommended. Conclusion Percutaneous vertebroplasty is a modern minimally invasive surgical procedure for the treatment of degenerative-dystrophic diseases of the spine. However, the cement can penetrate into the paravertebral veins and migrate to the right chambers of the heart and the pulmonary artery. This clinical case demonstrates asymptomatic cement embolism of the right chambers of the heart and pulmonary artery after percutaneous vertebroplasty, detected incidentally during routine echocardiography. Abstract P686 Figure.

Cat heart acetylcholine: structural proof and distribution

1976 ◽  
Vol 231 (3) ◽  
pp. 781-785 ◽  
Author(s):  
OM Brown
Keyword(s):  
Left Ventricle ◽  
Right Ventricle ◽  
Left Atrium ◽  
Right Atrium ◽  
Interventricular Septum ◽  
Pyrolysis Product ◽  
Heart Tissue ◽  
Choline Esters ◽  
The Right ◽  
Cat Heart

The distribution of acetylcholine (ACh) in the cat heart was investigated by a pyrolysis-gas chromatography (PGC) method. The hearts were dissected into various regions and homogenized in acetonitrile in the presence of propionylcholine, internal standard. Following extraction with toluene and hexane, the choline esters were precipitated as the enneaiodide complex. The isolated choline esters were analyzed by PGC, and the peak corresponding to ACh was quantified. The compound extracted from heart tissue that eluted with the retention time of authentic ACh was identified by mass spectrometry as dimethylaminoethylacetate, the pyrolysis product of ACh. ACh concentrations were found to be higher in the atria than the ventricles. In both the atria and the ventricles, a higher content of ACh was found in the right than the left portions: right ventricle, 5.0 compared to left ventricle, 2.0 nmol/g; and right atrium, 16.8 compared to left atrium, 11.3 nmol/g. Some cats were subjected to a bilateral cervical vagotomy 3 wk before removal and analysis of heart tissue. Hearts from vagotomized cats contained less ACh than controls in the right ventricle (-31%), right atrium (-54%), SA node (-42%), and papillary muscle (-53%), but no decreases were found in the left ventricle, left atrium, or interventricular septum.

Successful Retrieval of a Knotted Pulmonary Artery Catheter Trapped in the Right Ventricle Using a Dormier Basket

1997 ◽  
Vol 42 (6) ◽  
pp. 184-184 ◽  
Author(s):  
S. Hood ◽  
H.M. McAlpine ◽  
J. A. H. Davidson
Keyword(s):  
Pulmonary Artery ◽  
Right Ventricle ◽  
Pulmonary Artery Catheter ◽  
Tricuspid Valve ◽  
Right Atrium ◽  
Femoral Vein ◽  
Tricuspid Valve Annulus ◽  
Valve Annulus ◽  
Successful Retrieval ◽  
The Right

We report the case of a 71 year old patient in whom a pulmonary artery catheter (Swan Ganz) formed a knot which was fixed within the right ventricle in the region of the tricuspid valve annulus. The catheter was successfully dislodged to the right atrium, subsequently snared by a dormier basket advanced from the right femoral vein and retrieved by localised cut down of the femoral vein.

scholarly journals Right Atrial and Ventricular Adaptation to Chronic Right Ventricular Pressure Overload

Circulation ◽  
2005 ◽  
Vol 112 (9_supplement) ◽  
Author(s):  
Sydney L. Gaynor ◽  
Hersh S. Maniar ◽  
Jeffrey B. Bloch ◽  
Paul Steendijk ◽  
Marc R. Moon
Keyword(s):  
Pulmonary Hypertension ◽  
Pulmonary Artery ◽  
Right Ventricular ◽  
Right Atrium ◽  
Systolic Function ◽  
Pressure Overload ◽  
Right Atrial ◽  
Chronic Pulmonary Hypertension ◽  
The Right ◽  
Conduit Function

Background— Increased mortality in patients with chronic pulmonary hypertension has been associated with elevated right atrial (RA) pressure. However, little is known about the effects of chronic right ventricular (RV) pressure overload on RA and RV dynamics or the adaptive response of the right atrium to maintain RV filling. Methods and Results— In 7 dogs, RA and RV pressure and volume (conductance catheter) were recorded at baseline and after 3 months of progressive pulmonary artery banding. RA and RV elastance (contractility) and diastolic stiffness were calculated, and RA reservoir and conduit function were quantified as RA inflow with the tricuspid valve closed versus open, respectively. With chronic pulmonary artery banding, systolic RV pressure increased from 34±7 to 70±17 mm Hg ( P <0.001), but cardiac output did not change ( P >0.78). RV elastance and stiffness both increased ( P <0.05), suggesting preserved systolic function but impaired diastolic function. In response, RA contractility improved (elastance increased from 0.28±0.12 to 0.44±0.13 mm Hg/mL; P <0.04), and the atrium became more distensible, as evidenced by increased reservoir function (49±14% versus 72±8%) and decreased conduit function (51±14% versus 28±8%; P <0.002). Conclusions— With chronic RV pressure overload, RV systolic function was preserved, but diastolic function was impaired. To compensate, RA contractility increased, and the atrium became more distensible to maintain filling of the stiffened ventricle. This compensatory response of the right atrium likely plays an important role in preventing clinical failure in chronic pulmonary hypertension.

CARDIAC ARREST DURING STRENUOUS EXERCISE IN A PATIENT WITH CONGENITAL HEART DISEASE

PEDIATRICS ◽  
1963 ◽  
Vol 32 (4) ◽  
pp. 776-777
Author(s):  
Albert A. Kattus
Keyword(s):  
Heart Disease ◽  
Medical Student ◽  
Pulmonary Artery ◽  
Right Ventricle ◽  
Right Atrium ◽  
Vena Cava ◽  
Systolic Pressure ◽  
Strenuous Exercise ◽  
Heart Catheterization ◽  
The Right

THE FOLLOWING CASE is presented in order to introduce a note of caution into consideration of the advisability of recommending unmonitored exercise for patients with heart disease. The patient is a 24 year old third year medical student who had been known to have a heart murmur since birth. He had lived a vigorously active life and had participated in high school football as well as snow skiing in more recent years. At the age of 19 he underwent a detailed cardiac work-up including right heart catheterization at another hospital. The findings at that time included a normal examination except for a grade III/VI blowing pansystolic murmur at the 4th left intercostal space. The chest x-ray disclosed a normal cardiac silhouette with normal pulmonary vascularity. The electrocardiogram disclosed right bundle branch block and left axis deviation. Cardiac catheterization disclosed systolic pressure of 30 mm. Hg. in the right ventricle and 23 in the pulmonary artery. There was O2 saturation of 78 per cent in the superior vena cava and 75 per cent in the inferior vena cava. In the high and mid right atrium O2 saturations ranged from 76 per cent to 80 per cent. Low in the atrium, just above the tricuspid valve, there was a small step-up of O2 saturation to 83 per cent and similar saturations were found in the right ventricle and pulmonary artery. The findings suggested a small shunt from left ventricle to right atrium of the type seen in the transitional form of atrio-ventricular communis. During the two weeks prior to the present event the patient and his roommate who was also a third year medical student, had undertaken to improve their physical conditioning by performing the Canadian Air Force series of calisthenic exercises.

Efficiency and capacity of protein synthesis are increased in pressure overload cardiac hypertrophy

1988 ◽  
Vol 255 (2) ◽  
pp. H325-H328 ◽  
Author(s):  
R. Nagai ◽  
R. B. Low ◽  
W. S. Stirewalt ◽  
N. R. Alpert ◽  
R. Z. Litten
Keyword(s):  
Protein Synthesis ◽  
Pulmonary Artery ◽  
Cardiac Hypertrophy ◽  
Right Ventricle ◽  
Pressure Overload ◽  
Heart Weight ◽  
Rna Content ◽  
The Right ◽  
Pulmonary Artery Constriction

We measured the rate of protein synthesis and total RNA content in the right ventricle (RV) at day 2 and day 4 after pulmonary artery constriction to determine the contributions of changes in capacity and efficiency of in vivo protein synthesis to pressure overload (PO) cardiac hypertrophy. A significant increase in the proportion of RV weight to total heart weight was observed at day 2 and day 4 when compared with untreated controls. The rate of protein synthesis was significantly higher at day 2 post-PO (0.31 +/- 0.06 day-1 or 30 +/- 5 mg.g RV-1.day-1, means +/- SD, P less than 0.05) as well as at day 4 (0.25 +/- 0.05 day-1 or 28 +/- 9 mg.g RV-1.day-1, P less than 0.05) than for untreated rabbits (0.15 +/- 0.03 day-1 or 17 +/- 4 mg.g RV-1.day-1). RNA content was significantly higher at day 2 (1.47 +/- 0.17 mg/g RV, P less than 0.05) than in controls (1.16 +/- 0.14 mg/g RV), whereas there was a slight but nonsignificant increase at day 4 (1.36 +/- 0.21 mg/g RV, P less than 0.1). The efficiency of protein synthesis (synthesis/RNA) per gram RV was significantly increased both at day 2 (20.5 +/- 2.2 g protein.g RNA-1.day-1, P less than 0.05) and day 4 (19.8 +/- 3.5 g protein.g RNA-1.day-1, P less than 0.05) compared with control (14.6 +/- 2.3 g protein.g RNA-1.day-1). The increase in efficiency appeared to be caused by pressure overload itself based on a comparison of 0-4 day data vs. data obtained from sham animals (P less than 0.05).

scholarly journals Distinct right ventricle remodeling in response to pressure overload in the rat

2016 ◽  
Vol 311 (1) ◽  
pp. H85-H95 ◽  
Author(s):  
P. Mendes-Ferreira ◽  
D. Santos-Ribeiro ◽  
R. Adão ◽  
C. Maia-Rocha ◽  
M. Mendes-Ferreira ◽  
...  
Keyword(s):  
Pulmonary Artery ◽  
Right Ventricle ◽  
Pulmonary Circulation ◽  
Pressure Overload ◽  
Experimental Models ◽  
Pulmonary Vasculature ◽  
Full Detail ◽  
Functional Changes ◽  
Systolic And Diastolic Function ◽  
The Right

Pulmonary arterial hypertension (PAH), the most serious chronic disorder of the pulmonary circulation, is characterized by pulmonary vasoconstriction and remodeling, resulting in increased afterload on the right ventricle (RV). In fact, RV function is the main determinant of prognosis in PAH. The most frequently used experimental models of PAH include monocrotaline- and chronic hypoxia-induced PAH, which primarily affect the pulmonary circulation. Alternatively, pulmonary artery banding (PAB) can be performed to achieve RV overload without affecting the pulmonary vasculature, allowing researchers to determine the RV-specific effects of their drugs/interventions. In this work, using two different degrees of pulmonary artery constriction, we characterize, in full detail, PAB-induced adaptive and maladaptive remodeling of the RV at 3 wk after PAB surgery. Our results show that application of a mild constriction resulted in adaptive hypertrophy of the RV, with preserved systolic and diastolic function, while application of a severe constriction resulted in maladaptive hypertrophy, with chamber dilation and systolic and diastolic dysfunction up to the isolated cardiomyocyte level. By applying two different degrees of constriction, we describe, for the first time, a reliable and short-duration PAB model in which RV adaptation can be distinguished at 3 wk after surgery. We characterize, in full detail, structural and functional changes of the RV in its response to moderate and severe constriction, allowing researchers to better study RV physiology and transition to dysfunction and failure, as well as to determine the effects of new therapies.

scholarly journals NT-proBNP level and lesion of the right ventricle in patients with pulmonary embolism

2021 ◽  
Vol 28 (2) ◽  
pp. 50-57
Author(s):  
V. I. Tseluyko ◽  
L. M. Yakovleva ◽  
S. M. Sukhova ◽  
O. V. Radchenko ◽  
T. V. Pylova ◽  
...  
Keyword(s):  
Pulmonary Embolism ◽  
Pulmonary Artery ◽  
Left Atrium ◽  
Right Atrium ◽  
Troponin I ◽  
Echocardiographic Study ◽  
Echocardiographic Parameters ◽  
Highly Sensitive Troponin ◽  
The Right ◽  
The Relationship

The aim – to study the relationship between the level of NT-proBNP, clinical-anamnestic and echocardiographic parameters in patients with pulmonary embolism (PE).Materials and methods. The study was carried out on 45 patients with PE, which was confirmed by computed tomo­­graphy. An echocardiographic study was carried out during hospitalization of patients according to the standard protocol. The examination plan of patients, along with standard laboratory tests, included the determination of the level of highly sensitive troponin I, C-reactive peptide (CRP) and NT-proBNP.Results and discussion. The level of NT-proBNP is increased in patients with PE, even in the absence of heart failure (2932±266 pg/ml). There were no significant differences in the level of the indicator depending on the gender of patients (p=0.3), on the presence of arterial hypertension (p=0.92) and the concomitant oncological process (p=0.88). A correlation was found between NT-proBNP level and the size of the right and left atrium: right atrium (p=0.014), left atrium (p=0.025). The relationship between the level of NT-proBNP and the pressure in the pulmonary artery according to ultrasound data was proved (in patients with PE without signs of pulmonary hypertension, the level of NT-proBNP is 405 pg/ml, versus 4067 pg/ml in the group of patients with increased pressure in the pulmonary artery (p=0.0047). A correlation was found between the levels of NT-proBNP and CRP.Conclusions. There is a significant increase in the level of NT-proBNP in patients with PE, the degree of which correlates with an increase in the size of the right atrium and pressure in the pulmonary artery (p=0.0047).

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