Advanced searches left 3/3

Cardiac Pacemaker - DOAJ

Summarized by Plex Scholar
Last Updated: 10 January 2023

* If you want to update the article please login/register

Burst Stimulation of the Thoracic Spinal Cord near a Cardiac Pacemaker in an Elderly Patient with Postherpetic Neuralgia: A Case Report

Patients with chronic pain have been aided in their recovery by new advancements in spinal cord stimulation. Although the overall safety of modern SCS has been established, there have been no published studies indicating safety considerations when implanting a burst-mode spinal cord stimulator in patients with permanent heart rate monitors. Following the introduction of the burst-mode spinal cord stimulator, the patient showed significant improvement and pain relief. Traditional tonic-mode SCS in patients with PCP has also been reported.

Source link: https://doi.org/10.3390/medicina57040337


A compact and miniaturized implantable antenna for ISM band in wireless cardiac pacemaker system

Abstract A small and portable antenna for wireless heart ratemaker systems is manufactured. The antenna works in the Industrial Scientific Medical frequency bandwagon. The antenna has a length of 4. 5 mm3, and the width is just 3 mm, atu00d7 0. 5 mm. The antenna is built and packed with a defective slotted design, which increases the antenna's overall performance and consequently gain thereof. The antenna has good impedance matching in the ISM frequency band, covering the entire ISM frequency band. The antenna's true frequency is 22 percent, with a peak gain of u2212 24. 9 dBi. In addition, the antenna's specific absorption rate is also measured and analysed. The results show that this type of antenna is the most suitable option for wireless biological telemetry transmission in the very small space of the wireless cardiac pacemaker device.

Source link: https://doi.org/10.1038/s41598-021-04404-3


Impact of diastolic dysfunction in patients with preserved ejection fraction undergoing permanent cardiac pacemaker placement

Background: Patients with a low ejection percentage can have a heart failure despite persistent right-ventricular pacing. There is no information on the effects of diastolic impairment in patients with preserved EF undergoing permanent pacemaker placement. Methods This multicenter, retrospective review of PPM use in Chonnam, South Korea, included all patients with preserved EF undergoing transvenous PPM implantation for atrioventricular blockage from 2017 to 2019. Patients were divided into two groups according to DD, which were determined by including mitral flow velocities, peak velocity of the tricuspid regurgitant, and left atrial maximum volume index. DD and pQRSd were independent predictors of composite outcomes in a Cox proportional regression study. Despite maintained left-ventricular function, patients with DD and RV pacing increased the likelihood of pacing-induced heart failure in patients with DD. Patients with DD should therefore be closely monitored closely.

Source link: https://doi.org/10.1186/s42444-022-00078-8


Safety of holmium laser prostatectomy in patients with cardiac pacemaker implant

Objects: The use of the common monopolar electrocautery is associated with significant risks of implant failure in patients on a heart pacemaker. We review the success of this device in resecting the gland in patients on a permanent heart pacemaker implant. MARTERIALS AND METHODS: Six patients with permanent heart pacemaker implants were treated with holmium laser resection of prostate over a period of two years. In two of the patients, the larger fragments were also used to cut the larger fragments. Median patient age was 60 years, and median prostate volume was 40cc. From an average of 7 ml/sec in the preoperative period to 22 ml/sec postoperatively at a 3 month followup, an increase in maximum urine flow rate was demonstrated. Conclusions: The ideal modality of surgery in patients on a heart rate monitor is holmium laser prostatectomy.

Source link: https://doi.org/10.4103/0970-1591.24654


Crosstalk between mitochondrial and sarcoplasmic reticulum Ca2+ cycling modulates cardiac pacemaker cell automaticity.

Mitochondria hemodynamically buffer cytosolic Ca in cardiac ventricular cells, affecting the Ca load in the sarcoplasmic reticulum. According to the respective, the SR Ca load, Ca influx or efflux, Ca influx, mitochondrial Ca influx or efflux, and the LCR's size, duration, amplitude, and period have all increased or decreased. LCR Ca signals were highly correlated with the increase in the SR Ca load. A change in the spontaneous AP cycle length in reaction to [Ca] changes were predicted by rapid changes in the LCR period, which also affects the characteristics of spontaneous SR Ca loading.

Source link: https://doi.org/10.1371/journal.pone.0037582


Computational Analysis of a Multi-Layered Skin and Cardiac Pacemaker Model Based on Neural Network Approach

The present research explores the potential deleterious effects of the electromagnetic field of antennas used in cell phones or WiFi technologies on the pacemaker's body. This research aims to find out how the thickness of skin layers can influence the behaviour of a pacemaker exposed to a high-frequency electromagnetic field. According to various exposures of a tuned dipole and a PIFA antenna, various equations that describe the mathematical relationship between the subcutaneous layer thickness and electric field are used and applied for building a neural network.

Source link: https://doi.org/10.3390/s22176359


Electromagnetic interference in a cardiac pacemaker during cauterization with the coagulating, not cutting mode

During a spine surgery, we report a case of electrocautery-induced electromagnetic interference with a DDDR pacemaker in the coagulating and not cutting mode. While the electrodispersive pad was installed at various locations and distances from the operating site, a 74-year-old man suffered intraoperative electromagnetic interference that resulted in asystole caused by surgical electrocautery in the coagulation process, he was contaminated by intraoperative electromagnetic interference, which resulted in asystole caused by surgical electrocautery in the coagulation mode.

Source link: https://doi.org/10.4103/0970-9185.86600


Successful conversion of complete atrioventricular block to sinus rhythm without cardiac pacemaker: A case report

If left untreated, a complete atrioventricular block is a medical emergency, and is closely related to cardiac arrest. The introduction of a permanent heart pacemaker has been strongly recommended for its care. Hyperkalemia can be a reversible cause of complete AV block, which can be converted into sinus rhythm without a cardiac pacemaker, as this example shows. Routine testing and hyperkalemia screening may be considered as the alternative initial management before the cardiac pacemaker was introduced.

Source link: https://doi.org/10.20885/JKKI.Vol10.Iss3.art12


Increase in Ca2+-Activated cAMP/PKA Signaling Prevents Hydroxychloroquine-Induced Bradycardia of the Cardiac Pacemaker

Bradycardia or tachycardia are two typical side effects of drugs that limit their clinical use. The heart rate control function that monitors the heart rate under normal conditions is determined by a coupled clock system. Thus, interfering with a particular clock mechanism would affect other clock mechanisms by changes in interconnected signaling, which could result in rhythm disruption. We used isolated rabbit sinoatrial node cells, human-induced pluripotent stem cellu2013derived cardiomyocytes, and mouse SAN cells residing in SAN tissue, among other items. To provide mechanistic evidence of the effect of HCQ on pacemaker function, we used a SAN cell computational simulation. In all three models in parallel to slower intracellular kinetics, HCQ boosted mean spontaneous beat interval and variability. The sodium-calcium exchanger current reveals that HCQ has a detrimental influence on the pacemaker's current, L-type Ca2+ current, transient outward potassium, and Ca2+ due to Ca2+ changes, according to the computational model, and the sodium-calcium exchanger current.

Source link: https://doi.org/10.3389/fphys.2022.839140


The effective use of blebbistatin to study the action potential of cardiac pacemaker cells of zebrafish (Danio rerio) during incremental warming

We gathered intracellular microelectrode recordings of pacemaker cells growing in the sinoatrial zone of the zebrafish heart at room temperature and during acute warming to see whether or not blebbistatin inhibition of contraction significantly affects pacemaker cell electrophysiology. When recording were made at room temperature, none of these AP variables nor the spontaneous heart rate were significantly altered with the addition of 10 u03bcM blebbistatin. These results show that blebbistatin is an excellent excitation-contraction uncoupler that does not appear to have a positive effect on APs generated in the SAR's pacemaking cells and can, in turn, be used in zebrafish cardiac research.

Source link: https://doi.org/10.1016/j.crphys.2022.01.002

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions