Energy efficiency has been a leading issue in Wireless Sensor Networks (WSNs) and produced vast amount of research. Although the classic tradeoff between quality gathered data versus lifetime network, most works gave preference to an increased network at expense quality. A common approach for energy is partitioning into clusters with correlated data, where representative nodes simply transmit or average measurements inside cluster. In this paper, we explore joint use in-network processing...

Abstract Background and Objectives The ultrasound‐guided proximal infraclavicular costoclavicular block (PICB) appears popular but its results are inconsistent. We sought an accurate demonstration of septae formed between the brachial plexus cords. Methods performed in‐plane, lateral‐to‐medial PICBs on 120 patients recorded images. Once most superficial lateral cord component was entered, a 0.4–0.6 mA current applied to confirm needle placement; 5 ml local anesthetic (LA) solution then...

Water quality measurements in rivers are usually performed at intervals of days or months monitoring campaigns, but little attention has been paid to the spatial and temporal dynamics those measurements. In this work, we propose scrutinizing scope limitations state-of-the-art interpolation methods aiming estimate spatio-temporal (in terms trends structures) relevant variables for water analysis taken rivers. We used a database with several from Machángara River between 2002 2007 provided by...

The implantable cardioverter-defibrillator (ICD) electrogram (EG) is a documentation of ventricular tachycardia. We prospectively analyzed EGs from ICD electrodes located at the right ventricle apex to establish (1) ability regionalize origin left (LV) impulses, and (2) spatial resolution distinguish between paced sites.LV electro-anatomic maps were generated in 15 patients. ICD-EGs recorded during pacing 22 ± 10 LV sites. Voltage far-field EG deflections (initial, peak, final) time...

The inverse problem in electrophysiology consists of the accurate estimation intracardiac electrical sources from a reduced set electrodes at short distances and outside heart. This can provide an image with relevant knowledge on arrhythmia mechanisms for clinical practice. Methods based truncated singular value decomposition (TSVD) regularized least squares require matrix inversion, which limits their resolution due to unavoidable low-pass filter effect Tikhonov regularization techniques.We...

Although the general functionality and structures of acupoints have been studied, there has little insight into their underlying morphology physical characteristics. We describe microanatomical surrounding acupoints, electron microscopic appearance needles, effects acupuncture needling on fascia. injected heparinized blood solution through thin needles at seven known commonly used "sweat acupoints" in eight fresh, unembalmed, cryopreserved human cadavers to mark needle positions, later,...

During the last years, Electrocardiographic Imaging (ECGI) has emerged as a powerful and promising clinical tool to support cardiologists. Starting from plurality of potential measurements on torso, ECGI yields noninvasive estimation their causing potentials epicardium. This unprecedented amount measured cardiac signals needs be conditioned adapted current knowledge methods in electrophysiology order maximize its practice. In this setting, many indices are defined terms so-called bipolar...

Digital analysis of the bio-electrical signals allows us to obtain valuable information for clinical and research purposes.Despite current devices record store digital electrical signal, in some cases only a printout version is available.Although previous focused on algorithms digitize scanned printed nowadays color image can be immediately obtained with cell phone.Most these after manually selecting from whole one sub-image per signal digitize.Here, propose procedure automatically crop get...

The aim of this study was to examine the distribution nerve endings in mucosa, submucosa, and cartilage epiglottis vallecula area quantify them. findings could inform choice laryngoscope blades for intubation procedures. Fourteen neck slices from seven unembalmed, cryopreserved human cadavers were analyzed. stained, cross longitudinal sections obtained each. identified. primary metrics recorded number, area, circumference located mucosa submucosa pharyngeal laryngeal sides epiglottis,...

During the last years, attention and controversy have been present for first commercially available equipment being used in Electrocardiographic Imaging (ECGI), a new cardiac diagnostic tool which opens up field of possibilities. Previous knowledge criteria cardiologists using intracardiac Electrograms (EGM) should be revisited from newly spatial–temporal potentials, digital signal processing readapted to this data structure. Aiming contribute usefulness ECGI recordings current methods...

Electrograms stored in Implantable Cardioverter Defibrillators (ICD-EGM) have been proven to convey useful information for roughly determining the anatomical location of Left Ventricular Tachycardia exit site (LVTES). Our aim here was evaluate possibilities from a machine learning system intended provide an estimation LVTES region with use ICD-EGM situation where 12-lead electrocardiogram ventricular tachycardia are not available. Several techniques were specifically designed and...

Cardiac navigation systems (CNS) are often used in electrophysiological studies to create spatial-electrical maps supporting the arrhythmia mechanism identification. Sequentially recorded electrograms yield bioelectrical information from features such as voltage and activation times terms of their spatial location, which subsequently interpolated for building electroanatomical map (EAM) cardiac chamber. Our goal was evaluate quantitatively effect interpolation EAM accuracy when reconstructed...

Background and objectives We assume that intrafascicular spread of a solution can only occur if large enough portion the distal needle orifice is placed inside fascicle. Our aim to present evaluate mathematical model calculate theoretical vulnerability fascicles, analyzing degree occupancy in fascicular tissue by performing simulations multiple positions take cross-sectional nerve area. Methods superimposed microscopic images two routinely used block needles (22-gauge, 15° 22-gauge, 30°...

Abstract Background Accurate identification of slow pathway for the AVNRT ablation is important to achieve successful result and avoid complications mainly AV nodal block. There were some developments produce precise image locate this such as identify low voltage bridge (LVB) using electro-anatomical mapping visualization direct capture (DCSP). The peak frequency (PF) associated with bipolar EGMs a novel parameter which may serve distinguish near filed (NF) from far field (FF)...

Abstract Introduction Ablation of left atrial (LA) macroreentrant tachycardias (LAMT) poses considerable challenges, with issues such as tachycardia cycle length variations, multiple reentrant circuits, and termination during entrainment maneuvers. Evaluating deceleration zones (DZ) through pacing sinus rhythm, their correlation potential critical conduction isthmuses (CI) in LAMT, remains unexplored. This approach may facilitate LAMT ablation. Objective To investigate the presence DZ rhythm...

Abstract Introduction Effective pulmonary vein isolation (PVI) is the cornerstone of AF ablation, and conduction block from atrium to veins (PV) accepted method demonstrate it. However, far-field electrograms may make challenging establish whether PVI has been achieved. Purpose This study aimed evaluate peak frequency (PF) mapping can effectively identify in superior PVs following a redo procedure. Methods Left PV activation voltage bipolar 3D electroanatomical maps were generated using...

Abstract Background Successful ablation of left atrium macroreentrant tachycardia (LAMRT) has advanced significantly, benefiting from an enhanced understanding reentrant mechanisms and technological innovations. However, challenges like difficult inductions the presence multiple coexistent LAMRTs can complicate mapping, potentially resulting in recurrences during follow-up. Consequently, there is a growing need for strategies that focus on pinpointing critical isthmus conduction (CIC) LAMRT...