Collection of Mutually Synchronized Chaotic Systems

A general explicit coupling for mutual synchronization of two arbitrary identical continuous systems is proposed. The synchronization is proved analytically. The coupling is given for all 19 systems from Sprott's collection. For one of the systems the numerical results are shown in detail. The method could be adopted for the teaching of the topic.Comment: Published in Physics Letters A 352 (2006) 222-22

Дисфункция синусового узла: диагностика и лечение

Institute of Cardiology, Congresul III al Medicilor de Familie din Republica Moldova, 17–18 mai, 2012, Chişinău, Republica Moldova, Conferinţa Naţională „Maladii bronhoobstructive la copii”, consacrată profesorului universitar, doctor habilitat Victor Gheţeul, 27 aprilie, Chişinău, Republica MoldovaSinus node dysfunction (SND) refers to abnormalities in sinus node impulse formation and propagation, and includes sinus bradycardia, sinus pause/arrest, chronotropic incompetence, and sinoatrial exit block. SND is frequently associated with conduction system disease in the heart and various supraventricular tachyarrhythmias, such as atrial fibrillation and atrial flutter. When associated with supraventricular tachyarrhythmias, SND is often termed tachy-brady syndrome. Although SND may occur at any age, it is primarily a disease of the elderly and, presumably, related to the senescence of the sinus node, which is often accompanied with the senescence of the atrium and the conduction system in the heart. When SND occurs earlier in life, it is often secondary to other cardiac disease processes. The natural history of SND may be highly variable, although it tends to be progressive in nature. The only effective treatment for patients with chronic symptomatic SND is pacemaker therapy. Asymptomatic patients do not require therapy.Дисфункция синусового узла (ДСУ), относится к аномалиям в производстве и распространении импульсов от синусового узла и включает синусовую брадикардию, синусальную паузу/стоп (остановку), синоатриальную блокаду и хронотропную некомпетентность. ДСУ часто ассоциируется с заболеванием проводящей системы сердца и с различнными суправентрикулярными тахиаритмиями, такие как фибрилляция предсердий и трепетание предсердий. Ассоциация ДСУ с суправентрикулярной тахиаритмией называется тахи-брадикардиальным синдромом. Хотя ДСУ может проявляться в любом возрасте, является доминантным заболеванием пожилых, связанное с дегенеративными изменениями клеток синусового узла, которое часто наблюдается у пожилых людей. ДСУ у молодых, часто вторична другим болезням сердца. Естественная история ДСУ может быть чрезвычайно разнообразна, хотя и имеет тенденцию к прогрессированию. Единственным эффективным методом лечения больных с симптоматической хронической брадиаритмей является имплантация ЭКС. Бессимптомные пациенты не нуждаются в лечении

Myocardial infarction: progress and achievements

Department of Emergency and Cardiac Rhythm Disorders, Institute of Cardiology, Chisinau, the Republic of MoldovaBackground: Myocardial infarction (MI) remains a major health care and economic burden in Moldova. In the last decades in many countries the epidemiological studies have shown the reduction of MI related mortality. This reduction has partially been attributed to the new pharmacological and medical equipment advances that have been used during MI treatment. Despite a tangible improvement in the outcomes, MI remains a frequent cause of morbidity and mortality, what justifies the quest to find the new therapeutic approaches. Many patients with MI die from sudden death, which occurs outside the medical institutions. Conclusions: At present there are fewer chances of the extensive infarctions complicated with severe heart failure and ventricular wall rupture. The methods of early reperfusion have resulted in a marked improvement in the treatment of myocardial infarction associated with ST segment elevation, but have only slightly influenced the prognosis of extensive infarctions associated with ST segment depression. The ways to reduce the delay in doing coronary angioplasty after MI onset include the early recognition of symptoms by patients and by means of prehospital diagnosis. A major problem still remains the problem of late coming to the clinics of the patients with acute myocardial infarction. The low level of health education of the population, its ignorance of the disease onset signs has a negative impact on the possibility of preventing the severe complications