Why the study?
Heart failure is characterized by abnormalities in β-adrenergic receptor signaling leading to diminished β-adrenergic contractile response, but the pathophysiological alterations in this pathway require detailed discussion.
Heart failure is characterized by elevated circulating catecholamine levels and extensive abnormalities in β-adrenergic receptor signaling. Under physiological conditions, sympathetic modulation via catecholamines induces positive inotropic, chronotropic and lusitropic responses. Well established in heart failure patients is a pronounced activation of the sympathetic system, accompanied by downregulation and desensitization of β-adrenergic receptors, leading to a markedly diminished β-adrenergic contractile response. In this review, we will discuss the normal β-adrenergic receptor signaling pathway in the heart and focus on the pathphysiological alterations of β-adrenergic receptor signaling and contractile proteins in heart failure.
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Hamdani et al. (2012) studied Hypoxia. High altitude hypoxia vs. Sea level (normoxia) was evaluated on Calculated myocardial venous O2 saturation (SvO2) and PO2 at maximal exercise as a function of altitude.
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