impedance catheter

SummaryA vascular introducer sheath is often used for rapid volume replacement. However, common manipulations such as the addition of needleless connectors to infusion ports and the insertion of catheters or other devices through the introducer sheath may impede flow. In this study we utilised a rapid infuser to deliver room-temperature normal saline through two introducer sheath configurations with and without the addition of needleless connectors and the placement of catheters through the introducer sheaths...

INTRODUCTION: Traditional AF recurrence after catheter ablation is reported as a binary outcome. However, a paradigm shift towards a more granular definition, considering arrhythmic or symptomatic burden, is emerging. HYPOTHESIS: We hypothesize that ablation reduces AF burden independently of conventional recurrence status in persistent AF patients, correlating with symptom burden reduction. METHODS: 98 patients with persistent AF from the DECAAFII trial with pre-ablation follow-up were included...

OBJECTIVE: This study aims to identify contributing factors to adverse reactions related to central venous catheter (CVC) usage in patients with HIV/AIDS, to enhance patient care and treatment outcomes. METHODS: To obtain the most relevant and recent findings, we conducted a systematic search across reputable databases, including PubMed, EMBASE, and the Cochrane Library, focusing on randomized controlled trials from 2010 to 2023. Two researchers independently led the literature search and screening process, using a thorough pre-structured form for data extraction and performing a risk of bias assessment on selected studies...

Standard catheter-directed thrombolysis (CDT) and thrombus aspiration are considered potentially promising approaches for reopening the embolism-related pulmonary artery in patients with pulmonary embolism (PE) with high thrombotic burden and deteriorating hemodynamics, especially in those for whom systemic thrombolysis is contraindicated or has failed. However, the constrained accessibility of dedicated catheters has impeded the potential benefits of standard CDT in developing countries. The Guidezilla guide extension catheter (GEC) with a larger diameter and extended length is widely used in challenging coronary anatomy...

Intraductal radiofrequency ablation (RFA) has been used in the management of malignant biliary obstruction and ampullary neoplasms. Some small studies refer to its role in managing benign biliary strictures with some promising results. The complications are not neglectable, namely cholangitis, pancreatitis, bleeding, and perforation, although most of them can be managed conservatively. There are two catheters available. Only the ERLA (EndoLumunal Radiofrequency Ablation, Taewoong Medical) catheter can control temperature and impedance, allowing it to reduce the risk of complications...

INTRODUCTION: Pulmonary vein isolation (PVI) is often performed under general anaesthesia (GA) or deep sedation. Anaesthetic availability is limited in many centers, and deep sedation is prohibited in some countries without anaesthetic support. Very high-power short duration (vHPSD-90W/4 s) PVI using the Q-Dot catheter is generally well tolerated under mild conscious sedation (MCS) though an understanding of catheter stability and long-term effectiveness is lacking. We analyzed lesion metrics and 12-month freedom from atrial arrythmia with this approach...

BACKGROUND: Local impedance drop in cardiac tissue during catheter ablation may be a valuable measure to guide atrial fibrillation (AF) ablation procedures for greater effectiveness. OBJECTIVE: The study sought to assess whether local impedance drop during catheter ablation to treat AF predicts 1-year AF recurrence and what threshold of impedance drop is most predictive. METHODS: We identified patients with AF undergoing catheter ablation in the Mercy healthcare system...

RATIONALE: Blood flow rate affects mixed venous oxygenation (SvO2 ) during venovenous extracorporeal membrane oxygenation (ECMO), with possible effects on the pulmonary circulation and the right heart function. OBJECTIVES: We aimed at describing the physiologic effects of different levels of SvO2 obtained by changing ECMO blood flow, in patients with severe ARDS receiving ECMO and controlled mechanical ventilation. METHODS: Low (SvO2 target 70-75%), intermediate (SvO2 target 75-80%) and high (SvO2 target > 80%) ECMO blood flows were applied for 30 minutes in random order in 20 patients...

BACKGROUND: Roughly one in six patients receiving conventional transvenous pacemaker systems experience significant complications within 1 year of implant, mainly due to the transvenous lead and subcutaneous pocket. A new helix-fixation single-chamber ventricular leadless pacemaker (LP) system capable of pre-deployment exploratory electrical mapping is commercially available. Such an LP may mitigate complications while streamlining the implantation. In this study, the initial real-world implant experience of the helix-fixation LP was evaluated following its commercial release...

INTRODUCTION: The relationships between baseline tissue local impedance (LI), contact force (CF), atrial fibrosis, and atrial rhythm are uninvestigated in a clinical setting. We compared the relationship of LI and CF between atrial fibrillation (AF) and sinus rhythm (SR) accounting for the effects of atrial fibrosis as assessed by bipolar voltage and LI. METHODS: Patients undergoing persistent AF ablation were recruited. LI was recorded referenced to patient blood pool (LIr) and concurrent to changes in CF, with data collected at the same locations in AF and SR...

Continuous monitoring of bladder activity during normal daily activities would improve clinical diagnostics and understanding of the mechanisms underlying bladder function, or help validate how differing neuromodulation strategies affect the bladder. This work describes a urological monitor of conscious activity (UroMOCA). The UroMOCA included a pressure sensor, urine impedance-sensing electrodes, and wireless battery recharge and data transmission circuitry. Components were assembled on a circuit board and encapsulated with an epoxy/silicone molded package that allowed Pt-Ir electrode feedthrough for urine contact...

INTRODUCTION: Lesion size index (LSI) was introduced with the use of Tacticath™ and as a surrogate of lesion quality. The metric used to achieve the predetermined values involves combined information of contact force (CF), power and radiofrequency time. Rapid atrial pacing (RAP) and high-frequency low-tidal volume ventilation (HFLTV) independently or in combination improve catheter stability and CF and quality of lesions. Data of the impact of body weight adjusted HFLTV ventilation strategy associated with RAP in the lesion metrics still lacking...

AIMS: Aveir VR performance and predictors for its pacing threshold (PCT) in a real-world cohort were investigated. METHODS: Electrical measurements at various stages of an Aveir VR implant were prospectively collected. Predictors for 3-month PCT were studied. A retrospective cohort of consecutive 139 Micra implants was used to compare the PCT evolution. High PCT was defined as ≥1.5 V, using a pulse width of 0.4 ms for Aveir and 0.24 ms for Micra...

Background Acute moderate to severe pain after mastectomy is common and impedes patient recovery. Ambulatory serratus plane catheter with infusion pump (ASPIP) is a novel method to provide continuous delivery of local anaesthetic agents in the immediate postoperative period for extended analgesia, early mobility, and return to function after mastectomy. The aim of this project was to evaluate the introduction of ASPIP service and its effect on postoperative pain, opioid use, hospital stay, and recovery. Methods This was a service evaluation project...

BACKGROUND: Failure of radiofrequency (RF) ablation of ventricular arrhythmias is often due to inadequate lesion size. Irrigated radiofrequency ablation with half-normal saline (HNS) has the potential to increase lesion size and reduce sodium delivery to the patient if the same volume of RF irrgant were used for NS and HNS, but could increase risks related to steam pops and lesion size. AIMS: To assess peri-procedural complications and acute ablation outcome of ventricular arrhythmias ablation with HNS...

INTRODUCTION: Pulsed electric field (PEF) ablation relies on the intersection of a critical voltage gradient with tissue to cause cell death. Field-based lesion formation with PEF technologies may still depend on catheter-tissue contact (CTC). The purpose of this study was to assess the impact of CTC on PEF lesion formation with an investigational large area focal (LAF) catheter in a preclinical model. METHODS: PEF ablation via a 10-spline LAF catheter was used to create discrete right ventricle (RV) lesions and atrial lesion sets in 10 swine (eight acute, two chronic)...

UNLABELLED: The aim of the study was to evaluate chronic lesions resulting from endo-epicardial bipolar radio-frequency (RF) ablation (B-RFA) and determine optimal settings for such procedures in an animal model. METHODS: In 7 pigs up to 5 RF applications per animal were performed using two electrodes placed on both sides of the left ventricular free wall. Current was delivered for 60 seconds using generator dedicated for B-RFA with power settings of 25,30,35,40 and 50W...

BACKGROUND: The global cesarean delivery rate is high and continuing to increase. A bladder catheter is usually placed for the cesarean section as a distended bladder is assumed to be at higher risk of injury during surgery and to compromise surgical field exposure. Preliminary data suggest that self-bladder emptying (no catheter) at cesarean delivery may have advantages and be safe. OBJECTIVE: To evaluate self-bladder emptying to indwelling foley bladder catheterization for a planned cesarean on rate of postpartum urinary retention and maternal satisfaction...

BACKGROUND: The lesion index (LSI) has been used to estimate lesion formation after radiofrequency catheter ablation. However, the impedance drop and decrease in bipolar amplitude of intracardiac electrograms, which are parameters that are traditionally used to predict effective ablation lesions, are not used to calculate LSI. Therefore, we aimed to investigate the association between LSI and traditional parameters. METHODS: We retrospectively investigated 1355 ablation points from 31 patients who underwent LSI-guided pulmonary vein isolation (PVI) using TactiCath...

BACKGROUND: Catheter ablation of premature ventricular complexes (PVCs) and ventricular tachycardia (VT) from the left ventricular summit (LVS) may require advanced ablation techniques. Bipolar ablation from the coronary veins and adjacent endocardial structures can be effective for refractory LVS arrhythmias. OBJECTIVE: The aim of this study was to investigate the outcomes of bipolar ablation performed between the coronary venous system and adjacent endocardial left ventricular outflow tract (LVOT) or right ventricular outflow tract (RVOT)...