Transthyretin V142I Genetic Variant and Cardiac Remodeling, Injury, and Heart Failure Risk in Black Adults.

Objectives: This study evaluated the association of transthyretin (TTR) gene variant, in which isoleucine substitutes for valine at position 122 (V142I), with cardiac structure, function, and heart failure (HF) risk among middle-aged Black adults.

Background: The valine-to-isoleucine substitution in the TTR protein is prevalent in Black individuals and causes cardiac amyloidosis.

Methods: Jackson Heart Study participants without HF at baseline who had available data on the TTR V142I variant were included.

Admission respiratory status predicts mortality in COVID-19.

COVID-19 has significant case fatality. Glucocorticoids are the only treatment shown to improve survival, but only among patients requiring supplemental oxygen. WHO advises patients to seek medical care for "trouble breathing," but hypoxemic patients frequently have no respiratory symptoms.

A calcineurin-Hoxb13 axis regulates growth mode of mammalian cardiomyocytes.

A major factor in the progression to heart failure in humans is the inability of the adult heart to repair itself after injury. We recently demonstrated that the early postnatal mammalian heart is capable of regeneration following injury through proliferation of preexisting cardiomyocytes and that Meis1, a three amino acid loop extension (TALE) family homeodomain transcription factor, translocates to cardiomyocyte nuclei shortly after birth and mediates postnatal cell cycle arrest. Here we report that Hoxb13 acts as a cofactor of Meis1 in postnatal cardiomyocytes.

The Effect of Hypoxia on Cardiovascular Disease: Friend or Foe?

Savla, Jainy J., Benjamin D. Levine, and Hesham A.

Induced pluripotent stem cells for the study of cardiovascular disease.

Groundbreaking advances in stem cell research have led to techniques for the creation of human cardiomyocytes from cells procured from a variety of sources, including a simple skin biopsy. Since the advent of this technology, most research has focused on utilizing these cells for therapeutic purposes. However, recent studies have demonstrated that stem cell-derived cardiomyocytes generated from patients with inherited cardiovascular disorders recapitulate key phenotypic features of disease in vitro.

Cardiomyocyte proliferation contributes to heart growth in young humans.

The human heart is believed to grow by enlargement but not proliferation of cardiomyocytes (heart muscle cells) during postnatal development. However, recent studies have shown that cardiomyocyte proliferation is a mechanism of cardiac growth and regeneration in animals. Combined with evidence for cardiomyocyte turnover in adult humans, this suggests that cardiomyocyte proliferation may play an unrecognized role during the period of developmental heart growth between birth and adolescence.

Thoracic duct ligation for persistent chylothorax after pediatric cardiothoracic surgery.

Background: There is considerable literature on incidence and medical management of postsurgical chylothorax in children but little is known about outcomes of thoracic duct ligation (TDL) for patients refractory to medical therapy.

Methods: A retrospective review of patients undergoing TDL after cardiothoracic surgery (1992 through 2007) was done. Data on demographics including cardiac morphology, characteristics of chylous drainage, medical management, and post-TDL course were collected.