Does parathyroid hormone improve contractile performance of adult rat ventricular cardiomyocytes at low concentrations in a non-acute way?
Low concentrations of PTH improve cell shortening by increasing calcium load at rest. By this mechanism cardiomyocytes compensate reduced extracellular calcium levels as they occur in patients with heart failure.
Consistency of oxygen therapy is more important than overall oxygen level in inducing retinopathy. Consideration should be given to tighter control of intended oxygen therapy in premature infants, regardless of the target saturation level.