Low peaking-phenomenon cascade high-gain observer design with LPV/LMI method.

To cope with the well-known peaking phenomenon and noise sensitivity in the application of the High-Gain observer, a parameter tuning method based on the LPV/LMI approach for a 2nd-order cascade observer structure is proposed in this paper. Compared to other high-gain observer methods, this method can significantly reduce the infimum of gain in the observer, thereby reducing the peak phenomenon of state estimation and the influence of measurement output noise. By transforming the observer structure into a Luenberger-like structure, the parameters of the observer can be solved by one linear matrix inequality (LMI) with a high-gain effect or a 2n of LMI sets (LMIs) without a high-gain effect.

[Influence of small-dose dexmedetomidine on recovery of patients undergoing vertebral operation].

Objective: To evaluate the influence of small-dose dexmedetomidine infusion on recovery of patients undergoing vertebral operation.

Methods: Sixty ASA I-II patients undergoing vertebral operation were randomly divided into two groups (n=30). In group I, dexmedetomidine infusion was pumped at the rate of 0.

[Circumferential pulmonary vein with additional linear ablation for persistent and permanent atrial].

Objective: To investigate the safety and efficacy of circumferential pulmonary vein with additional linear ablation in treatment of persistent and permanent atrial fibrillation (AF), and to identify possible predictors of recurrence of AF.

Methods: The clinical data of 127 patients with persistent and permanent AF who had undergone circumferential pulmonary vein with additional linear ablation from January 2006 to December 2006 in multiple electrophysiological centers were collected, success rate and recurrence rate, cardiac function and atrial arrhythmias after ablation, and complications were analyzed. The relationship between the recurrent AF and clinical and echocardiographic variables was investigated.

[Mechanism and re-ablation strategy for postablation atrial tachyarrhythmia in atrial fibrillation patients].

Objective: To investigate the mechanism and re-ablation strategy of recurrent atrial tachyarrhythmia (ATA) following circumferential ablation of pulmonary veins (PV) in patients with atrial fibrillation (AF).

Methods: Fifteen patients with recurrent ATA following first AF ablation procedure were included in this study. Under CARTO guidance, PVs were remapped and ablated subsequently for relapse of left atrium to PV conduction.

Different clinical features, biochemical profiles, echocardiographic and elctrocardiographic findings in older and younger patients with idiopathic dilated cardiomyopathy.

Objective: To study the clinical features, biochemical profiles, echocardiographic and electrocardiographic findings in the elderly and younger with idiopathic dilated cardiomyopathy (IDCM).

Methods: We measured biochemical profiles and reviewed the clinical features, echocardiographic and electrocardiographic findings in 40 elderly (group A) and 70 younger (group B) patients with IDCM.

Results: The aldosterone level in group A was higher than in group B (304.

Hypercoagulability existing in the local left atrium of patient with mitral stenosis.

Objective: To investigate the pathogenesis of thromboembolism in patients with mitral stenosis in a pre-thrombotic state.

Methods: The biochemical markers' levels in plasma for platelet activity [soluble P-selectin (GMP-140)], states of thrombin generation [antithrombin III (AT III) and protein C (PC)], fibrinolysis [D-dimer (DD), plasminogen activator inhibitor 1 (PAI-1), tissue plasminogen activator (t-PA) and FDP] and von Willebrand factor (vWF) were determined from blood specimens obtained from the femoral veins and arteries and the right and left atria of 43 consecutive patients (20 with atrial fibrillation and 23 with sinus rhythm) with mitral stenosis (MS), undergoing percutaneous mitral valvuloplasty. The same parameters were compared with those of 15 control subjects, who had no detectable heart disease, but with paroxysmal supraventricular tachycardia undergoing radiofrequency catheter ablation of the left accessory pathway through a transseptal passage.

[Study on the correlation of between infection, inflammation and coronary artery disease].

Objective: Recently studies showed infections of Chlamydia pneumoniae (Cp), Helicobacter pylori (Hp) and cytomegalovirus (CMV) played roles in the development of atherosclerosis. The aim of this study was to study relationship between infection of Cp, Hp and CMV, systemic inflammation and coronary artery disease (CAD).

Methods: Fourty-five patients with at least one coronary artery stenosis > 50% and 33 control subjects with negative coronary angiography were recruited for this case-control study from May 2000 to October 2001.

[Radiofrequency catheter ablation autonomic nerve injury].

OBJECTIVE: To investigate the correlation between RFCA catheter cumulative energy and autonomic nerve injury. METHODS: Forty-one patients with paroxysmal supraventricular tachycardia were enrolled, Patients were excluded if they had Diabetes, Hypertension, Congestive Heart Failure or other organic heart disease. HRV and biochemical markers were measured before and after the RFCA.