Adult congenital heart disease: a review of the simple lesions.

There has been a dramatic improvement in mortality rates among children with congenital heart disease with advances in neonatal screening and surgical techniques, resulting in a significant increase in the prevalence of adults living with congenital heart disease. The most common simple lesions of congenital heart disease include atrial and ventricular septal defects, patent ductus arteriosus and coarctation of the aorta, which are typically detected and treated in childhood. However, they may also present in adulthood with non-specific symptoms or incidental findings, such as refractory hypertension.

Life-long brain compensatory responses to galactic cosmic radiation exposure.

Galactic cosmic radiation (GCR) composed of high-energy, heavy particles (HZE) poses potentially serious hazards to long-duration crewed missions in deep space beyond earth's magnetosphere, including planned missions to Mars. Chronic effects of GCR exposure on brain structure and cognitive function are poorly understood, thereby limiting risk reduction and mitigation strategies to protect against sequelae from exposure during and after deep-space travel. Given the selective vulnerability of the hippocampus to neurotoxic insult and the importance of this brain region to learning and memory, we hypothesized that GCR-relevant HZE exposure may induce long-term alterations in adult hippocampal neurogenesis, synaptic plasticity, and hippocampal-dependent learning and memory.

Developmental Time Course of SNAP-25 Isoforms Regulate Hippocampal Long-Term Synaptic Plasticity and Hippocampus-Dependent Learning.

SNAP-25 is essential to activity-dependent vesicle fusion and neurotransmitter release in the nervous system. During early development and adulthood, SNAP-25 appears to have differential influences on short- and long-term synaptic plasticity. The involvement of SNAP-25 in these processes may be different at hippocampal and neocortical synapses because of the presence of two different splice variants, which are developmentally regulated.

SNAP-25 isoforms differentially regulate synaptic transmission and long-term synaptic plasticity at central synapses.

SNAP-25 exists as two developmentally regulated alternatively spliced isoforms, SNAP-25a and SNAP-25b. We explored the function of SNAP-25a and SNAP-25b at Schaffer collateral-CA1 synapses in hippocampus using 4-week-old wild-type (WT) and SNAP-25b-deficient (MT) mice. Characterizing the protein expression of individual SNAP-25 isoforms revealed that WT females had higher levels of SNAP-25a than WT males, suggesting a sex-dependent delay of the alternative splicing switch from SNAP-25a to SNAP-25b.

Twenty-three year-old with pleuritic chest pain.

Clinical Introduction: A 23-year-old woman followed at another medical centre for congenital heart disease (CHD) presented to our emergency clinic with 3 weeks of bilateral pleuritic chest pain. She returned from holiday in Greece 6 weeks earlier where a tattoo and nasal piercing had been performed. There was no history of night sweats or fever.