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Coronary angiogenesis as an endogenous response to myocardial ischemia in adults

Gabriel Lorier et al. Cristina Touriño Renato A. K Kalil

The process of angiogenesis involves a complex sequence of stimuli and integrated responses, such as stimulation of endothelial cells (ECs) for their proliferation and migration, stimulation of the extracellular matrix (ECM) for the attraction of pericytes and macrophages, stimulation of smooth muscle cells for their proliferation and migration, and formation of new vascular structures. Angiogenesis is mainly an adaptive response to tissue hypoxia and depends on the accumulation of the hypoxia-inducible factor (HIF-1α) in the ischemic myocardial area, which increases the transcription of the vascular endothelial growth factor (VEGF) and its receptors VEGF-R by the ECs undergoing ischemia. Those steps involve enzymatic mechanisms and plasminogen activator proteases, metalloproteinases (MMP) of the ECM, and kinases that cause proteolytic molecular degradation of the ECM and activation and release of growth factors, such as: basic fibroblast growth factor (bFGF), VEGF, and insulin growth factor-1 (IGF-1). In the intermediate phase, stabilization of the immature neovascular sprout occurs. The final phase is characterized by vascular maturation of the physiological angiogenesis. In conclusion, coronary angiogenesis in adults is fundamentally a paracrine response of the preexisting capillary network under pathophysiological condition of ischemia and inflammation.

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Case Report

Constrictive pericarditis with extensive calcification

Marcelo Villaça Lima et al. Juliano Novaes Cardoso Cristina Martins dos Reis Cardoso Euler Cristovan Ochiai Brancalhão … Renan Prado Limaco Antonio Carlos Pereira Barretto

A patient with signs and symptoms of right heart failure of unknown etiology was referred to a referral hospital in the eastern area of the city of São Paulo with a diagnosis of calcified constrictive pericarditis and was treated by surgery. This pathology is characterized by an irreversible process of pericardium calcification, and surgery is the only alternative to control the symptoms and improve patients’ quality of life. This case drew special attention due to the extensive calcification involving the interventricular septum. The unusual aspect of the images has made the diagnosis difficult and raised doubts about the existence of an associated disease.

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Coronary angiogenesis as an endogenous response to myocardial ischemia in adults

Constrictive pericarditis with extensive calcification

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Electronic Document Format (Vancouver)

Electronic Document Format (ABNT)

Electronic Document Format (APA)

Electronic Document Format (ISO)