Changes in the Plasma and Platelet Nitric Oxide Biotransformation Metabolites during Ischemic Stroke-A Dynamic Human LC/MS Metabolomic Study

Despite improvement in the management of modifiable cardiovascular risk factors, ischemic stroke remains the leading cause of morbidity and mortality in the adult population. The aim of this study was to analyze the time-dependent dynamic differences in expression of the nitric oxide (NO) metabolic pathway in the platelet and plasma compartment between subjects with and without ischemic stroke. Additionally, the interplay between these parameters and platelet aggregation was investigated. A total of 418 patients in acute phase of non-cardioembolic stroke were investigated. Following the inclusion and exclusion criteria, finally 40 subjects with stroke and 39 demographically matched healthy participants were enrolled. Neurological physical examination, followed by assessment of the platelet and plasma levels of the nitric oxide synthase (NOS) inhibitors, including asymmetric dimethylarginine (ADMA) and symmetric dimethylarginine (SDMA), as well as NOS substrate-L-Arginine were performed dynamically three times within the first 24-h, then on the 3rd and 7th day after the stroke onset, which was compared with the healthy control. The platelet L-Arginine concentration was significantly higher on the 1st and 3rd day of stroke, while the plasma levels were significantly lower on exact days in comparison to the control. The competitive NOS-inhibitors in platelets were stably elevated in stroke subjects, whereas no significant differences in plasma compartment were noted. The arachidonic-acid-induced platelet aggregation was negatively associated with the platelet NOS substrate bioavailability, as assessed by the L−Arginine ADMA-ratio on the 3rd and 7th day. Subjects with non-cardioembolic ischemic stroke are characterized by elevated platelet levels of NOS inhibitors. Management of stroke results in increasing the platelet L-Arginine concentration and subsequent NO bioavailability in the platelet compartment.

The relationship between panic disorder and hypertension. A review of literature

About 1/4 of the world's adult population suffers from hypertension. Due to the high prevalence of the disease, its impact on mortality and socio-economic costs, it is important to search for modifiable causes of its development. This review analyses studies in order to answer the question: Is there a higher prevalence of panic disorder in adults (≥18 years of age) with hypertension, than in normotensive group? There have been found 10 cross-sectional studies describing correlation between hypertension and panic disorder. Odds ratio for this two clinical entities ranged from OR = 3.31 (2.99-3.67) to OR = 1.19 (0.87-1.62). Moreover, frequency of coincidence of those two clinical entities was found between 4.2% and 18.75%. In the prospective studies there have been found a positive association between panic disorder and subsequent life-long development of hypertension OR= 1.7 (1.4-2.0). On the other hand, association between hypertension and subsequent development of panic disorder in the 12-months observation was OR = 3.23 (1.51-6.93), but in 3 years of observation it was insignificant OR = 1.12 (0.80-1.57). Based on the literaturereview, dueto the differences in methodology and the small number of prospective studies, it can only be suggested to clinicians that in some cases they should search for panic disorder in patients with hypertension, especially paroxysmal one.

The effect of lateral electrical surface stimulation (LESS) on motor end-plates in an animal model of experimental scoliosis

The treatment of idiopathic scoliosis is challenging because of its diverse etiology, age of onset, and long duration of intensive treatment. We examined the effect of lateral electrical surface stimulation (LESS) in an animal model of experimental scoliosis (ES) assessing the number of motor end-plates (MEPs) as a study end-point. The control group (n=5) was adapted to the experimental apparatus without stimulation, whereas ES was induced in rabbits by one-sided LESS of the longissimus dorsi muscle (LDM) for a duration of 2 months. The ES group (n=5) were subjected to a short-term corrective electrostimulation applied at the contralateral side of the spine compared to the previous LESS stimulation for 2 h daily for 3 (n=5) or 6 months (n=5). Another group of ES rabbits was subjected to a long-term corrective electrostimulation applied for 9 h daily for 3 (n=5) or 6 months (n=5). LESS applied for 2 months (ES), significantly increased the number of MEPs in LDM. The short-term corrective electrostimulation for 3 months resulted in an increased number of MEPs. However, a decrease was observed in the animals treated for 6 months. The long-term corrective electrostimulation for 3 months did not change the density of MEPs in the LDM, but for 6 months the number of MEPs in the LMD significantly decreased by ES and control groups. Thus, the results of the present study clearly show that the short-term LESS is able to influence both the number of MEPs and the effectiveness of muscle correctional adaptation in a more efficient and harmless manner than the long-term procedure.