Optimism-pessimism, conspiracy theories and general trust as factors contributing to COVID-19 related behavior - A cross-cultural study.

The main aim of this research was to examine the role of optimism-pessimism, general trust and belief in conspiracy theories, in COVID-19 related fears, preventive and hoarding behaviors. We also examined the role of different sources of information in these relations. The convenience sample was used (N = 412) and it consisted of individuals from Serbia (N = 292) and Latin-America (N = 120). Following instruments were used: The Life Orientation Test (Scheier, Carver, & Bridges, 1994), Trust in people scale (Arbor, 1964), questions regarding fear, source of information, preventive behaviors and conspiracy constructed for the purposes of this research. The results suggest that fear of food shortage was the most pronounces one in both samples, followed by fear for oneself and finally by the fear for beloved others. Results suggest that optimists, those with high level of general trust and those who do not believe in conspiracy theories show lower level of fear and higher level of preventive behaviors. Pessimists on the other hand, show higher level of fear. Fear was related to all information sources suggesting that more information leads to higher intensity of fear - except information from the president which did not show any effect.

The significance of amlodipine on autonomic nervous system adjustment (ANSA method): a new approach in the treatment of hypertension.

INTRODUCTION: Cardiovascular autonomic modulation is altered in patients with essential hypertension. OBJECTIVE: To evaluate acute and long-term effects of amlodipine on cardiovascular autonomic function and haemodynamic status in patients with mild essential hypertension. METHODS: Ninety patients (43 male, mean age 52.12 +/- 10.7) years with mild hypertension were tested before, 30 minutes after the first 5 mg oral dose of amlodipine and three weeks after monotherapy with amlodipine. A comprehensive study protocol was done including finger blood pressure variability (BPV) and heart rate variability (HRV) beat-to-beat analysis with impedance cardiography, ECG with software short-term HRV and nonlinear analysis, 24-hour Holter ECG monitoring with QT and HRV analysis, 24-hour blood pressure (BP) monitoring with systolic and diastolic BPV analysis, cardiovascular autonomic reflex tests, cold pressure test, mental stress test. The patients were also divided into sympathetic and parasympathetic groups, depending on predominance in short time spectral analysis of sympathovagal balance according to low frequency and high frequency values. RESULTS: We confirmed a significant systolic and diastolic BP reduction, and a reduction of pulse pressure during day, night and early morning hours. The reduction of supraventricular and ventricular ectopic beats during the night was also achieved with therapy, but without statistical significance. The increment of sympathetic activity in early phase of amlodipine therapy was without statistical significance and persistence of sympathetic predominance after a few weeks of therapy detected based on the results of short-term spectral HRV analysis. All time domain parameters of long-term HRV analysis were decreased and low frequency amongst spectral parameters. Amlodipne reduced baroreflex sensitivity after three weeks of therapy, but increased it immediately after the administration of the first dose. CONCLUSION: The results of the study showed that amlodipine affected autonomic modulation as a shift to sympathetic hyperactivity, but without statistical significance. In the selected group of patients with vagal predominance in sympathovagal balance, amlodipine increased sympathetic and decreases vagal activity. Therefore we conclude that amlodipine mostly exerts impact on autonomic function modulation in patients with vagal predominance in resting state.