An oscilloscopic study aimed at determining the first signs of pacemaker failure was carried out in vitro after removal in 95 cases. Using a differential apparatus with a 1 megahertz passing band, the following parameters were measured: interspike interval, amplitude, duration and morphology of the spike. During the course of the study, signs of pacemaker failure were seen in 66 cases. It may be concluded that the interspike interval represents the easiest and most precise measurement, making it possible alone to detect dysfunction in 70 per 100 of cases. However, in 30 per 100 of cases, represented by certain types of pacemaker, its alteration is preceded by a decrease in voltage. Whilst the latter may be precisely and easily measured in vitro, the same does not apply when the pacemaker is in situ and only large changes may be taken to be significant and interpreted in relation to the number of batteries in the model studied. Study of the vectrocardiogram should be added to the measurements mentioned above, any sudden change in axis of the spike being an argument in favour of a fault in the conductor. In the future, measurement of the area of the spike, a reflection of the energy delivered the histogram of the RR intervals giving an idea of the respective durations of function and of inhibition in demand models will provide additional information.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Leadless pacemaker implantation in a patient with congenital azygos continuation of the inferior vena cava.
BMC Cardiovasc Disord
January 2025
Department of Cardiology, Xijing Hospital, Air Force Medical University, Xi'an, Shaanxi, China.
In case of venous route abnormality during a leadless pacemaker (LP) implantation, it can be challenging if we still performed via the predesigned femoral vein. We report a patient with normal preoperative laboratory and image results, but azygos continuation of the inferior vena cava (IVC) was suspected during the procedure. Then, we decided to change the implantation strategy, the LP implantation was successfully performed via right jugular vein instead of the classical IVC route.
View Article and Find Full Text PDFThe crucial role of 18F-fluorodeoxyglucose positron emission tomography/computed tomography in diagnosing pulmonary valve endocarditis in patients after transcatheter pulmonary valve implantation: a case report.
Eur Heart J Case Rep
January 2025
Department of Cardiology, Azorg, Merestraat 80, 9300 Aalst, Belgium.
Background: Patients after transcatheter pulmonary valve implantation (TPVI) are at increased risk for infective prosthetic valve endocarditis. Diagnosis of infective endocarditis (IE) following TPVI is particularly difficult due to impaired visualization of the transcatheter pulmonary valve (TPV) with echocardiography [Delgado V, Ajmone Marsan N, de Waha S, Bonaros N, Brida M, Burri H, et al. 2023 ESC guidelines for the management of endocarditis.
View Article and Find Full Text PDFConduction system metastasis in a patient with carcinoma oesophagus.
BMJ Case Rep
January 2025
Cardiology, AIIMS, New Delhi, India
A young man in his 30s presented to us with multiple episodes of syncope and exertional dyspnoea for the last 2 weeks. He was diagnosed with squamous cell carcinoma of the lower one-third of the oesophagus in 2021 for which he was treated with neoadjuvant chemoradiotherapy, followed by McKeown oesophagectomy. At 2-year follow-up, he had developed a soft tissue swelling in the scalp, which was diagnosed as a tumour recurrence and radiotherapy was initiated.
View Article and Find Full Text PDFSevere bradycardia in patients with obstructive sleep apnoea and good early response to CPAP.
Sleep Breath
January 2025
Department of Cardiac and Vascular Diseases, Jagiellonian University Medical College, John Paul II Hospital, Prądnicka 80, Kraków, 31-202, Poland.
Background: Obstructive sleep apnoea (OSA) may lead to heart rhythm abnormalities including bradycardia. Our aim was to ascertain clinical and echocardiographic parameters in patients with OSA in whom severe bradycardia was detected in an outpatient setting, as well as to evaluate the efficacy of CPAP therapy on heart rate normalization at the early stages of treatment.
Methods: Fifteen patients mild, moderate or severe OSA and concomitant bradycardia were enrolled.
Micra Leadless and Transvenous Pacemaker: A Single-Center Comparative Study of QRS Wave Duration Resulting From Different Pacing Sites.
Ann Noninvasive Electrocardiol
January 2025
Department of Cardiology, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
Objective: To compare the paced QRS duration on different sites in age-, gender-, and indication-matched patients implanted with Micra leadless pacemakers and conventional transvenous pacemakers (TV-PM).
Method: A total of 82 patients from Xinhua Hospital, Shanghai Jiaotong University, were enrolled, including two groups of 41 patients matched according to gender, age, and pacemaker indications, who underwent Micra and TV-PM implantations, respectively. The baseline data of the patients, the pacing site described using three- and nine-partition methods, and the paced QRS duration on 12-lead electrocardiogram were then analyzed.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!