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Journal of the American College of... Apr 2019There is increasing recognition of the crucial role of the right ventricle (RV) in determining functional status and prognosis in multiple conditions. The normal RV is... (Review)
Review
There is increasing recognition of the crucial role of the right ventricle (RV) in determining functional status and prognosis in multiple conditions. The normal RV is anatomically and functionally different from the left ventricle, which precludes direct extrapolation of our knowledge of left-sided physiopathology to the right heart. RV adaptation is largely determined by the level of exposure to hemodynamic overload (both preload and afterload) as well as its intrinsic contractile function. These 3 processes (pressure overload, volume overload, and RV cardiomyopathy) are associated with distinct clinical course and therapeutic approach, although in reality they often coexist in various degrees. The close relationship between the RV and left ventricle (ventricular interdependence) and its coupling to the pulmonary circulation further modulate RV behavior in different clinical scenarios. In this review, the authors summarize current knowledge of RV anatomic, structural, metabolic, functional, and hemodynamic characteristics in both health and disease.
Topics: Heart Ventricles; Hemodynamics; Humans; Hypertension, Pulmonary; Ventricular Dysfunction, Right; Ventricular Function, Right
PubMed: 30922478
DOI: 10.1016/j.jacc.2018.12.076 -
Critical Care (London, England) Sep 2016The primary role of the right ventricle (RV) is to deliver all the blood it receives per beat into the pulmonary circulation without causing right atrial pressure to... (Review)
Review
The primary role of the right ventricle (RV) is to deliver all the blood it receives per beat into the pulmonary circulation without causing right atrial pressure to rise. To the extent that it also does not impede left ventricular (LV) filling, cardiac output responsiveness to increased metabolic demand is optimized. Since cardiac output is a function of metabolic demand of the body, during stress and exercise states the flow to the RV can vary widely. Also, instantaneous venous return varies widely for a constant cardiac output as ventilatory efforts alter the dynamic pressure gradient for venous return. Normally, blood flow varies with minimal changes in pulmonary arterial pressure. Similarly, RV filling normally occurs with minimal increases in right atrial pressure. When pulmonary vascular reserve is compromised RV ejection may also be compromised, increasing right atrial pressure and limiting maximal cardiac output. Acute increases in RV outflow resistance, as may occur with acute pulmonary embolism, will cause acute RV dilation and, by ventricular interdependence, markedly decreased LV diastolic compliance, rapidly spiraling to acute cardiogenic shock and death. Treatments include reversing the causes of pulmonary hypertension and sustaining mean arterial pressure higher than pulmonary artery pressure to maximal RV coronary blood flow. Chronic pulmonary hypertension induces progressive RV hypertrophy to match RV contractility to the increased pulmonary arterial elastance. Once fully developed, RV hypertrophy is associated with a sustained increase in right atrial pressure, impaired LV filling, and decreased exercise tolerance. Treatment focuses on pharmacologic therapies to selectively reduce pulmonary vasomotor tone and diuretics to minimize excessive RV dilation. Owning to the irreversible nature of most forms of pulmonary hypertension, when the pulmonary arterial elastance greatly exceeds the adaptive increase in RV systolic elastance, due to RV dilation, progressive pulmonary vascular obliteration, or both, end stage cor pulmonale ensues. If associated with cardiogenic shock, it can effectively be treated only by artificial ventricular support or lung transplantation. Knowing how the RV adapts to these stresses, its sign posts, and treatment options will greatly improve the bedside clinician's ability to diagnose and treat RV dysfunction.
Topics: Cardiac Output; Heart Ventricles; Humans; Hypertension, Pulmonary; Pulmonary Circulation; Ventricular Dysfunction, Right
PubMed: 27613549
DOI: 10.1186/s13054-016-1440-0 -
Cardiology Journal 2017Estimation of right ventricular (RV) performance still remains technically challenging due to its anatomical and functional distinctiveness. The current guidelines for... (Review)
Review
Estimation of right ventricular (RV) performance still remains technically challenging due to its anatomical and functional distinctiveness. The current guidelines for the echocardiographic quantification of RV function recommend using multiple indices to describe the RV in a thorough and comprehensive manner, such as RV index of myocardial performance, tricuspid annular plane systolic excursion, fractional area change, Doppler tissue imaging-derived tricuspid lateral annular systolic velocity (S'-wave), three-dimensional RV ejection fraction (3D RVEF), RV longitudinal strain (RVLS)/strain rate by speckle- tracking echocardiography (STE). Among these, the last one mentioned here is an innovative and a particularly promising tool that yields more precise information about complex regional and global RV mechanics. STE was initially designed to evaluate left ventricular function, but recently it has been introduced to assess RV performance, which is difficult due to its unique structure and physiology. Many studies have shown that both free wall and 6-segment RVLS present a stronger correlation with the RVEF assessed by cardiac magnetic resonance than conventional parameters and seem to be more sensitive in detecting myocardial dysfunction at an earlier, subclinical stage.
Topics: Biomechanical Phenomena; Echocardiography, Doppler; Echocardiography, Three-Dimensional; Heart Ventricles; Humans; Predictive Value of Tests; Prognosis; Severity of Illness Index; Stress, Mechanical; Stroke Volume; Systole; Ventricular Dysfunction, Right; Ventricular Function, Right
PubMed: 28497844
DOI: 10.5603/CJ.a2017.0051 -
Anesthesiology Jan 2019
Review
Topics: Echocardiography; Heart Defects, Congenital; Heart Ventricles; Humans
PubMed: 30192239
DOI: 10.1097/ALN.0000000000002438 -
Journal of Nuclear Cardiology :... Dec 2020
Topics: Cardiotoxicity; Fluorodeoxyglucose F18; Heart Ventricles; Humans; Myocardium; Neoplasms
PubMed: 30771160
DOI: 10.1007/s12350-019-01602-5 -
Journal of the American Heart... Apr 2024
Topics: Humans; Prognosis; Heart Ventricles; Hypertension, Pulmonary; Ventricular Function, Right; Patients
PubMed: 38567674
DOI: 10.1161/JAHA.124.034711 -
Cells Nov 2023There is an increasing recognition of the crucial role of the right ventricle (RV) in determining the functional status and prognosis in multiple conditions. In the past... (Review)
Review
There is an increasing recognition of the crucial role of the right ventricle (RV) in determining the functional status and prognosis in multiple conditions. In the past decade, the epigenetic regulation (DNA methylation, histone modification, and non-coding RNAs) of gene expression has been raised as a critical determinant of RV development, RV physiological function, and RV pathological dysfunction. We thus aimed to perform an up-to-date review of the literature, gathering knowledge on the epigenetic modifications associated with RV function/dysfunction. Therefore, we conducted a systematic review of studies assessing the contribution of epigenetic modifications to RV development and/or the progression of RV dysfunction regardless of the causal pathology. English literature published on PubMed, between the inception of the study and 1 January 2023, was evaluated. Two authors independently evaluated whether studies met eligibility criteria before study results were extracted. Amongst the 817 studies screened, 109 studies were included in this review, including 69 that used human samples (e.g., RV myocardium, blood). While 37 proposed an epigenetic-based therapeutic intervention to improve RV function, none involved a clinical trial and 70 are descriptive. Surprisingly, we observed a substantial discrepancy between studies investigating the expression (up or down) and/or the contribution of the same epigenetic modifications on RV function or development. This exhaustive review of the literature summarizes the relevant epigenetic studies focusing on RV in human or preclinical setting.
Topics: Humans; Heart Ventricles; Epigenesis, Genetic; Ventricular Dysfunction, Right; Myocardium; Ventricular Function, Right
PubMed: 38067121
DOI: 10.3390/cells12232693 -
Herzschrittmachertherapie &... Sep 2022To understand the position of a pacing lead in the right ventricle and to correctly interpret fluoroscopy and intracardiac signals, good anatomical knowledge is... (Review)
Review
To understand the position of a pacing lead in the right ventricle and to correctly interpret fluoroscopy and intracardiac signals, good anatomical knowledge is required. The right ventricle can be separated into an inlet, an outlet, and an apical compartment. The inlet and outlet are separated by the septomarginal trabeculae, while the apex is situated below the moderator band. A lead position in the right ventricular apex is less desirable, last but not least due to the thin myocardial wall. Many leads supposed to be implanted in the apex are in fact fixed rather within the trabeculae in the inlet, which are sometimes difficult to pass. In the right ventricular outflow tract (RVOT), the free wall is easier to reach than the septal due to the fact that the RVOT wraps around the septum. A mid-septal position close to the moderator band is relatively simple to achieve and due to the vicinity of the right bundle branch may produce a narrower paced QRS complex. Special and detailed knowledge is necessary for His bundle and left bundle branch pacing.
Topics: Cardiac Pacing, Artificial; Electrocardiography; Heart Conduction System; Heart Ventricles; Humans; Ventricular Septum
PubMed: 35763099
DOI: 10.1007/s00399-022-00872-w -
Journal of Anatomy Jan 2023The right ventricle (RV) is an important structure which serves a multitude of vital physiological functions in health. For many years, the left ventricle has dominated... (Review)
Review
The right ventricle (RV) is an important structure which serves a multitude of vital physiological functions in health. For many years, the left ventricle has dominated the focus of understanding in both biology and pathophysiology and the RV was felt to be more of a passive structure which rarely had an effect on disease states. However, it is increasingly recognised that the RV is essential to the homoeostasis of normal physiology and disturbances in RV structure and function have a substantial effect on patient outcomes. Indeed, the prognosis of diseases of lung diseases affecting the pulmonary vasculature and left heart disease is intimately linked to the function of the right ventricle. This review sets out to describe the developmental and anatomical complexities of the right ventricle while exploring the modern techniques employed to image and understand its function from a clinical perspective.
Topics: Humans; Heart Ventricles
PubMed: 35285014
DOI: 10.1111/joa.13654 -
JACC. Cardiovascular Imaging May 2022
Topics: Algorithms; Artificial Intelligence; Heart Ventricles; Humans; Machine Learning; Predictive Value of Tests
PubMed: 35512950
DOI: 10.1016/j.jcmg.2022.01.019