Significance of left atrial overload by electrocardiogram in the assessment of left ventricular diastolic dysfunction

AbstractBackgroundAlthough assessment of left ventricular (LV)  diastolic function (DF) using echocardiography is important, it is not always feasible in the clinical practice. On the other hand, left atrial (LA) overload shown by electrocardiogram (ECG) indicates LA pressure rise and LA dilatation. The purpose of this study is to examine whether LA overload b y ECG can be used as an aid for evaluation of LVDF.MethodsThere were 117 subjects who underwent echocardiography and ECG on the same day. The duration of P-wave (P-duration) in lead II, the amplitude and duration of P-wave negative phase in lead V1 were measured by ECG, and terminal force (PTFV1) was calculated. We analyzed the relationships between LVDF grades and LA overload signs.ResultsP-duration showed a good correlation with LA volume index (LAVi) (r = 0.673,P 
Source: Journal of Echocardiography - Category: Cardiology Source Type: research

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In conclusion, although young and non-smoking volunteers considered themselves healthy by questionnaire, 20% showed signs of a heart, liver, or airway disease, and additional 24% were classified as atopics. This suggests that more detailed clinical testing may be necessary to safely exclude those who may adversely react to controlled exposure with sensory irritants. PMID: 31974924 [PubMed - as supplied by publisher]
Source: Advances in Experimental Medicine and Biology - Category: Research Tags: Adv Exp Med Biol Source Type: research
This article presents a new wearable platform, SeisMote, for the monitoring of cardiovascular function in controlled conditions and daily life. It consists of a wireless network of sensorized nodes providing simultaneous multiple measures of electrocardiogram (ECG), acceleration, rotational velocity, and photoplethysmogram (PPG) from different body areas. A custom low-power transmission protocol was developed to allow the concomitant real-time monitoring of 32 signals (16 bit @200 Hz) from up to 12 nodes with a jitter in the among-node time synchronization lower than 0.2 ms. The BluetoothLE protocol may be used when only a...
Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research
CONCLUSION: As reimbursement for emergency medicine in Germany was recently rearranged, quality benchmarking has gained incremental importance. Mandatory joint quality measurement in both concepts ensuring gap analysis and process improvement is encouraged. PMID: 31970463 [PubMed - as supplied by publisher]
Source: Herz - Category: Cardiology Tags: Herz Source Type: research
Publication date: Available online 24 January 2020Source: IRBMAuthor(s): X. Gu, J. Hu, L. Zhang, J. Ding, F. YanAbstractThe rapid development of the wearable electrocardiogram monitoring equipment increases the requirements for R peak detection in wearable devices. An improved method called ISC algorithm is proposed with high anti-interference ability for R peak detection in wearable devices based on a simple basic algorithm called SC algorithm. The proposed method is characterized by using the updated amplitude selection threshold, updated slope comparison threshold and RR interval judgement to reduce false positives and ...
Source: IRBM - Category: Biomedical Engineering Source Type: research
CONCLUSION: ECG-gated RVA recording is not able to detect any relevant change in vessel pulsation behaviour under oxygen, despite clearly observed vasoconstriction in retinal vessels. New approaches are necessary to reliably quantify the rigidity of the retinal vessels. PMID: 31968371 [PubMed - as supplied by publisher]
Source: Klinische Monatsblatter fur Augenheilkunde - Category: Opthalmology Tags: Klin Monbl Augenheilkd Source Type: research
AbstractPurposeMyocardial contusion can be a life-threatening condition in patients who sustained blunt thoracic trauma. The diagnostic approach remains a subject of debate. The aim of this study was to determine the sensitivity and specificity of echocardiography, electrocardiography, troponins T and I (TnT and TnI), and creatine kinase muscle/brain (CK-MB) for identifying patients with a myocardial contusion following blunt thoracic trauma.MethodsSensitivity and specificity were first determined in a 10-year retrospective cohort study and second by a systematic literature review with meta-analysis.ResultsOf the 117 patie...
Source: European Journal of Trauma and Emergency Surgery - Category: Emergency Medicine Source Type: research
AbstractThe prognostic impact of left atrial size in patients without systolic dysfunction nor atrial fibrillation (AF) has not been fully elucidated in Japan. We retrospectively analyzed data obtained from 4444 consecutive patients who had undergone both scheduled transthoracic echocardiography and electrocardiography in 2013 in our hospital. Those who presented with a history of myocardial infarctions, severe and moderate valvular diseases, low ejection fraction (  34 ml/m2. The primary outcome measure was a composite of all-cause death and major adverse cardiac events. A total of 2792 patients were categoriz...
Source: Heart and Vessels - Category: Cardiology Source Type: research
In this paper we develop an adaptive transform-domain technique based on rational function systems. It is of general importance in several areas of signal theory, including filter design, transfer function approximation, system identification, control theory etc. The construction of the proposed method is discussed in the framework of a general mathematical model called variable projection. First we generalize this method by adding dimension type free parameters. Then we deal with the optimization problem of the free parameters. To this order, based on the well-known particle swarm optimization (PSO) algorithm, we develop ...
Source: IEEE Transactions on Signal Processing - Category: Biomedical Engineering Source Type: research
The human voltage-sensitive K+ channel hERG plays a fundamental role in cardiac action potential repolarization, effectively controlling the QT interval of the electrocardiogram. Inherited loss- or gain-of-function mutations in hERG can result in dangerous “long” (LQTS) or “short” QT syndromes (SQTS), respectively, and the anomalous susceptibility of hERG to block by a diverse range of drugs underlies an acquired LQTS. A recent open channel cryo-EM structure of hERG should greatly advance understanding of the molecular basis of hERG channelopathies and drug-induced LQTS. Here we describe an update o...
Source: Frontiers in Pharmacology - Category: Drugs & Pharmacology Source Type: research
AbstractObjectiveThe aim of this study was to demonstrate the temporal profile of changes in heart rate variability (HRV), blood pressure variability (BPV), and cardiac baroreflex sensitivity (BRS) during the course of a healthy pregnancy.Materials and methodsThis was a longitudinal study during which autonomic variability parameters (HRV, BPV, BRS) were assessed in 66 pregnant women at 11 –13, 20–22 and 30–32 weeks of gestation. A lead II electrocardiogram tracing and beat-to-beat blood pressure were recorded with the subject breathing spontaneously in the supine position. Changes in the parameters ...
Source: Clinical Autonomic Research - Category: Research Source Type: research
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