Does the right ventricle experiment morphologic and functional changes similarly to the left ventricle during pregnancy?

To examine the status of ATP-sensitive K+ (K+ATP) channels and 1,4-dihydropyridine-sensitive Ca2+ (Ca2+DHP) channels during experimental cardiac failure, we have measured the radioligand binding properties of [3H]glyburide and [3H]PN 200 110, respectively, in tissue homogenates from the rat cardiac left ventricle, right ventricle, and brain 4 wk after myocardial infarction induced by left coronary artery ligation. The maximal values (Bmax) for [3H]glyburide and [3H]PN 200 110 binding were reduced by 39 and 40%, respectively, in the left ventricle, and these reductions showed a good correlation with the right ventricle-to-body weight ratio in heart-failure rats. The ligand binding affinities were not altered. In the hypertrophied right ventricle, Bmax values for both the ligands were not significantly different when data were normalized to DNA content or right ventricle weights but showed an apparent reduction when normalized to unit protein or tissue weight. Moderate reductions in channel densities were observed also in whole brain homogenates from heart failure rats. Assessment of muscarinic receptors, beta-adrenoceptors and alpha 1-adrenoceptors by [3H]quinuclidinyl benzilate, [3H]dihydroalprenolol, and [3H]prazosin showed reductions in left ventricular muscarinic and beta-adrenoceptor densities but not in alpha 1-adrenoceptor densities, consistent with earlier observations. It is suggested that these changes may in part contribute to the pathology of cardiac failure.

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Ventricular systolic interdependence: volume elastance model in isolated canine hearts

AJP Heart and Circulatory Physiology ◽

10.1152/ajpheart.1987.253.6.h1381 ◽

1987 ◽

Vol 253 (6) ◽

pp. H1381-H1390 ◽

Cited By ~ 18

Author(s):

W. L. Maughan ◽

K. Sunagawa ◽

K. Sagawa

Keyword(s):

Left Ventricle ◽

Right Ventricle ◽

Cross Talk ◽

Systolic Pressure ◽

Left Ventricular ◽

Ventricular Free Wall ◽

Free Wall ◽

Right Ventricular Free Wall ◽

Systolic Volume ◽

The Right

To analyze the interaction between the right and left ventricle, we developed a model that consists of three functional elastic compartments (left ventricular free wall, septal, and right ventricular free wall compartments). Using 10 isolated blood-perfused canine hearts, we determined the end-systolic volume elastance of each of these three compartments. The functional septum was by far stiffer for either direction [47.2 +/- 7.2 (SE) mmHg/ml when pushed from left ventricle and 44.6 +/- 6.8 when pushed from right ventricle] than ventricular free walls [6.8 +/- 0.9 mmHg/ml for left ventricle and 2.9 +/- 0.2 for right ventricle]. The model prediction that right-to-left ventricular interaction (GRL) would be about twice as large as left-to-right interaction (GLR) was tested by direct measurement of changes in isovolumic peak pressure in one ventricle while the systolic pressure of the contralateral ventricle was varied. GRL thus measured was about twice GLR (0.146 +/- 0.003 vs. 0.08 +/- 0.001). In a separate protocol the end-systolic pressure-volume relationship (ESPVR) of each ventricle was measured while the contralateral ventricle was alternatively empty and while systolic pressure was maintained at a fixed value. The cross-talk gain was derived by dividing the amount of upward shift of the ESPVR by the systolic pressure difference in the other ventricle. Again GRL measured about twice GLR (0.126 +/- 0.002 vs. 0.065 +/- 0.008). There was no statistical difference between the gains determined by each of the three methods (predicted from the compartment elastances, measured directly, or calculated from shifts in the ESPVR). We conclude that systolic cross-talk gain was twice as large from right to left as from left to right and that the three-compartment volume elastance model is a powerful concept in interpreting ventricular cross talk.

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Cardiac involvement in patients with coronavirus pneumonia

European Journal of Cardiovascular Nursing ◽

10.1093/eurjcn/zvab060.025 ◽

2021 ◽

Vol 20 (Supplement_1) ◽

Author(s):

O Germanova ◽

O Tereshina

Keyword(s):

Left Ventricle ◽

Right Ventricle ◽

Left Atrium ◽

Longitudinal Strain ◽

Cardiac Involvement ◽

Mean Value ◽

Systolic Pulmonary Artery Pressure ◽

Functional Changes ◽

End Diastolic Volume ◽

The Mean

Abstract Funding Acknowledgements Type of funding sources: None. Background. New COVID-19 disease is well known by its primary damage of respiratory system. However, it is also possible to involve other organs and systems. Purpose. To determine the cardiac involvement in patients with COVID-19 pneumonia. Materials and methods. We performed echocardiography with speckle tracking in 48 patients. All of them had serologically verified COVID-19 pneumonia with lung involvement 5-60% on CT. None of them were treated by antimalarial drugs. 28 of them were men and 20 women, mean age - 45 ± 4,4 years old. We performed echocardiography in 1 month period from onset of the disease. Results. Most of the patients (30 patients) had enlargement of right heart chambers. Despite of right ventricle enlargement, in none of the patients had reduced right ventricle function (TAPSE 22 ± 2 mm, right ventricle strain -21,2 ± 1,5%). The mean systolic pulmonary artery pressure was slightly elevated (38 ± 2 mm Hg). Left ventricle was enlarged in 9 patients (with mean end diastolic volume 82 ± 5 ml/m2). In 25 of them, the ejection fraction was decreased (44 ± 4%). In all patients with COVID-19 pneumonia, the changes in circumferential and longitudinal strain were observed. Both parameters were decreased. The mean value of circumferential strain was -16,3 ± 1,9%. The longitudinal strain parameter was -14,2 ± 1,4%. 25 patients had enlargement of left atrium (>40ml/m2) and the reservoir strain of left atrium was decreased (-23,3 ± 1,5%) in 29 of them. After 2 months from the onset of the disease, we noticed the normalization of echocardiography data in all patients. Nevertheless, we observed cardiac structural and functional changes in all patients, troponins levels were increased only in 12 patients. Conclusion. We observed cardiac involvement in different degree in all of patients with COVID-19 pneumonia. Changes characterized by atriums and ventricles enlargement, and left ventricle contractile dysfunction. Due to the fact that only part of the patients with COVID-19 with cardiac changes had elevated troponins, we believe that the mechanism of these pathological changes need further research.

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BIOMARKERS OF MYOCARDIAL DAMAGE AND STRUCTURAL AND FUNCTIONAL CHANGES IN THE RIGHT VENTRICLE AFTER PNEUMONEECTOMY

Transbaikalian Medical Bulletin ◽

10.52485/19986173_2021_2_29 ◽

2021 ◽

pp. 29-38

Author(s):

O.A. Bolshedvorskaya ◽

K.V. Protasov ◽

T.Yu. Kolchina ◽

A.V. Nebesnykh ◽

V.V. Dvornichenko ◽

...

Keyword(s):

Right Ventricle ◽

Myocardial Damage ◽

Functional Changes ◽

The Right

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Failure of Cellularization of Ventriculotomy Patch Leading to Right Ventricular Pseudoaneurysm

World Journal for Pediatric and Congenital Heart Surgery ◽

10.1177/2150135119880547 ◽

2019 ◽

Vol 11 (1) ◽

pp. 123-126

Author(s):

Sruti Rao ◽

Robert D. Stewart ◽

Gosta Pettersson ◽

Carmela Tan ◽

Suzanne Golz ◽

...

Keyword(s):

Left Ventricle ◽

Ventricular Septal Defect ◽

Right Ventricle ◽

Right Ventricular ◽

Septal Defect ◽

Tricuspid Atresia ◽

Outflow Obstruction ◽

Ventricular Outflow Obstruction ◽

The Right ◽

Double Inlet Left Ventricle

Enlargement of the bulboventricular foramen (BVF) in double-inlet left ventricle or the ventricular septal defect (VSD) in tricuspid atresia with transposition of the great arteries is one approach for prevention or treatment of systemic ventricular outflow obstruction. Most often, BVF/VSD restriction is bypassed preemptively or addressed directly at the time of Glenn/Fontan procedures as part of staged univentricular palliation. We describe a patient who underwent enlargement of a restrictive VSD during Fontan completion and subsequently presented with an asymptomatic pseudoaneurysm of the right ventricle at the ventriculotomy site.

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Cat heart acetylcholine: structural proof and distribution

American Journal of Physiology-Legacy Content ◽

10.1152/ajplegacy.1976.231.3.781 ◽

1976 ◽

Vol 231 (3) ◽

pp. 781-785 ◽

Cited By ~ 31

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.

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Early alterations in myocardia and vessels of the diabetic rat heart: an FTIR microspectroscopic study

Biochemical Journal ◽

10.1042/bj20060171 ◽

2006 ◽

Vol 397 (3) ◽

pp. 427-436 ◽

Cited By ~ 72

Author(s):

Neslihan Toyran ◽

Peter Lasch ◽

Dieter Naumann ◽

Belma Turan ◽

Feride Severcan

Keyword(s):

Left Ventricle ◽

Right Ventricle ◽

Rat Heart ◽

Molecular Level ◽

Diabetic Group ◽

Control Group ◽

Type I ◽

Short Term ◽

The Right ◽

Left Ventricle Myocardium

Diabetes mellitus is associated with a high incidence and poor prognosis of cardiovascular disease. The aim of the present study was to examine the effect of relatively short-term (5 weeks) Type I diabetes on the left ventricle, the right ventricle and the vessel (vein) on the left ventricle of the myocardium at molecular level by FTIR (Fourier-transform infrared) microspectroscopy. The rats were categorized into two groups: control group (for the left ventricle myocardium, n=8; for the right ventricle myocardium, n=9; for the vein, n=9) and streptozotocin-induced diabetic group (for the left ventricle myocardium, n=7; for the right ventricle myocardium, n=9; for the vein, n=8). Two adjacent cross-sections of 9 μm thickness were taken from the ventricles of the hearts in two groups of rats by using a cryotome. The first sections were used for FTIR microspectroscopy measurements. The second serial sections were stained by haematoxylin/eosin for comparative purposes. Diabetes caused an increase in the content of lipids, an alteration in protein profile with a decrease in α-helix and an increase in β-sheet structure as well as an increase in glycogen and glycolipid contents in both ventricles and the vein. Additionally, the collagen content was found to be increased in the vein of the diabetic group. The present study demonstrated that diabetes-induced alterations in the rat heart can be detected by correlating the IR spectral changes with biochemical profiles in detail. The present study for the first time demonstrated the diabetes-induced alterations at molecular level in both ventricle myocardia and the veins in relatively short-term diabetes.

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P5272Right versus Left Ventricular Remodelling after Surgical myectomy for HOCM

European Heart Journal ◽

10.1093/eurheartj/ehz746.0243 ◽

2019 ◽

Vol 40 (Supplement_1) ◽

Author(s):

M Abdelkhalek ◽

A El Sawy ◽

R Doss ◽

A Samaan ◽

M Donia ◽

...

Keyword(s):

Left Ventricle ◽

Nyha Class ◽

Left Ventricular ◽

P Value ◽

Peak Strain ◽

Functional Changes ◽

Septal Myectomy ◽

Surgical Myectomy ◽

The Right

Abstract Background Surgical myectomy for (HOCM) results in complex structural and functional changes. “Remodelling” in different cardiac chambers. To date, changes in the Right versus the left Ventricle have not been studied. Methods Fourty five patients (mean age = 32±16, 68% males) who underwent extended septal myectomy for LVOTO and Fourty “normal” controls (mean age = 32±12 years, 52% males) were studied by cardiac magnetic resonance imaging (CMR). The patients were studied pre-operatively and 6–18 months post-operatively (median = 9 months). The images were analysed by both commercial and in-house software. Results After myectomy. Follow up CMR showed changes in RV mass (21±5 to 23±7) g/m2, volume (60±15 to 66±12) ml/m2 and shape using 3 different methods. RV deformation parameters showed significant changes with circumferential strain (−8±2 to −14±4), filling (38±16 to 62±19) ml/s/m2 and ejection rate (−44±17 to −75±22). Changes in RV were substantially higher than those observed in the LV (Figure. 1, Table. 1). All patients reported significant symptomatic improvement with 31 (78%) patients in NYHA class I and 9 (22%) in class II at follow up. Significant reduction in peak gradient across the LVOT by 75%. Table 1. Summary of reported parameters related to RV Shape for pre and post operation HOCM patients and Normal Healthy Volunteers LV RV Pre Post Normal P-value Pre Post Normal P-value EDV ml/m2 75±18 81±14 73±10 0.005 60±15 66±12 71±12 0.002 ESV ml/m2 20±9 24±8 26±6 0.008 16±7 19±9 26±7 0.02 SV ml/m2 56±13 57±10 51±13 0.38 44±11 48±10 49±14 0.009 EF 74±7 70±7 65±5 0.001 74±8 72±7 64±6 0.228 Mass g/m2 74±33 62±29 27±8 0.0456 21±5 23±7 18±5 0.2100 PFR ml/m2 173±48 141±48 141±40 <0.0001 38±16 62±19 55±24 <0.0001 PER ml/m2 −179±35 −172±42 −144±42 0.29 −44±17 −75±22 −57±22 <0.0001 Peak Strain −20±3 −20±3 −20±3 0.49 −8±2 −14±4 −12±3 <0.0001 Conclusion LV septal myectomy is followed by structural and functional remodelling which is more extensive in the right than the left ventricle. The clinical significance of these findings needs further study.

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Myosin types and fiber types in cardiac muscle. I. Ventricular myocardium.

The Journal of Cell Biology ◽

10.1083/jcb.88.1.226 ◽

1981 ◽

Vol 88 (1) ◽

pp. 226-233 ◽

Cited By ~ 97

Author(s):

S Sartore ◽

L Gorza ◽

S Pierobon Bormioli ◽

L Dalla Libera ◽

S Schiaffino

Keyword(s):

Left Ventricle ◽

Right Ventricle ◽

Cardiac Muscle ◽

Muscle Fibers ◽

Ventricular Myocardium ◽

Rabbit Heart ◽

Fiber Types ◽

Ventricular Muscle ◽

The Right ◽

Atrial Myosin

Antisera against bovine atrial myosin were raised in rabbits, purified by affinity chromatography, and absorbed with insolubilized ventricular myosin. Specific anti-bovine atrial myosin (anti-bAm) antibodies reacted selectively with atrial myosin heavy chains, as determined by enzyme immunoassay combined with SDS-gel electrophoresis. In direct and indirect immunofluorescence assay, anti-bAm was found to stain all atrial muscle fibers and a minor proportion of ventricular muscle fibers in the right ventricle of the bovine heart. In contrast, almost all muscle fibers in the left ventricle were unreactive. Purkinje fibers showed variable reactivity. In the rabbit heart, all atrial muscle fibers were stained by anti-bAm, whereas ventricular fibers showed a variable response in both the right and left ventricle, with a tendency for reactive fibers to be more numerous in the right ventricle and in subepicardial regions. Diversification of fiber types with respect to anti-bAm reactivity was found to occur during late stages of postnatal development in the rabbit heart and to be influenced by thyroid hormone. All ventricular muscle fibers became strongly reactive after thyroxine treatment, whereas they became unreactive or poorly reactive after propylthiouracil treatment. These findings are consistent with the existence of different ventricular isomyosins whose relative proportions can vary according to the thyroid state. Variations in ventricular isomyosin composition can account for the changes in myosin Ca2+-activated ATPase activity previously observed in cardiac muscle from hyper- and hypothyroid animals and may be responsible for the changes in the velocity of contraction of ventricular myocardium that occur under these conditions. The differential distribution of ventricular isomyosins in the normal heart suggests that fiber types with different contractile properties may coexist in the ventricular myocardium.

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