Photoplethysmography as a Potential Alternative to Electrocardiography for Recording Heart Rate Intervals Used in Variability Analysis.

This study investigates the use of photoplethysmography (PPG) as a comfortable alternative to electrocardiography (ECG) for heart rate variability (HRV) analysis. Although HRV is typically analyzed from an ECG trace, PPG poses a likely alternative, as arterial pulsations and peripheral tissue perfusion (as measured by PPG) are coupled with cardiac electrical activity (as measured by ECG). PPG may be more desirable in some clinical circumstances, as a fingertip optical sensor is more comfortable for patients than ECG electrodes, and can reduce waste by not needing to be disposed after each use. Objective. The aim of this study is to assess the efficacy of using PPG as an alternative to ECG for recording cardiac activity for HRV analysis by comparing HRV data obtained using both methods. Methods and results. The study was conducted on 10 healthy human subjects, aged 20 to 25 years (4 males, 6 females). Three lead ECG and fingertip PPG traces were simultaneously recorded with a two-channel analog-to-digital converter and HRV parameters were calculated from each data set. The two sets of HRV data simultaneously obtained from the same subjects were compared. The results showed a high correlation between ECG-derived and PPG-derived HRV data (R2>0.95). Time-domain parameters, frequency-domain parameters and Poincaré geometry and analysis showed no significant difference between HRV analyses using PPG as compared to ECG for heart beat detection. Discussion. The comparison b...
Source: Journal of Medicine and Life - Category: General Medicine Tags: J Med Life Source Type: research

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Discussion The pericardium is a bi-layered membrane that envelops the heart and provides a barrier to prevent disease and also decreases friction as the heart moves. Pericarditis is the inflammation of pericardium. The incidence is underreported as asymptomatic or mild disease may go unrecognized. From hospitalized patient data, 0.2-5% of patients with various cardiac disease had pericarditis. An incidence rate for hospitalizations of 3.32 per 100,000 person years has been cited. Percarditis occurs more often in adolescent males. Treatment of the underlying cause or suspected cause is important, along with close monitorin...
Source: PediatricEducation.org - Category: Pediatrics Authors: Tags: Uncategorized Source Type: news
Conclusion: Some cases with CCI treated with IV-tPA and endovascular intervention were reported, but the treatment strategy should be still discussed multidisciplinary. Especially, the administration of antithrombotic drugs for CCI should be carefully performed because fatal hemorrhage such as cardiac tamponade can occur. PMID: 31893142 [PubMed]
Source: Surgical Neurology International - Category: Neurosurgery Tags: Surg Neurol Int Source Type: research
Abstract Rodent models are frequently employed in cardiovascular research, yet our understanding of pediatric cardiac physiology has largely been deduced from more simplified two-dimensional cell studies. Previous studies have shown that postnatal development includes an alteration in the expression of genes and proteins involved in cell coupling, ion channels, and intracellular calcium handling. Accordingly, we hypothesized that postnatal cell maturation is likely to lead to dynamic alterations in whole-heart electrophysiology and calcium handling. To test this hypothesis, we employed multiparametric imaging and ...
Source: American Journal of Physiology. Heart and Circulatory Physiology - Category: Physiology Authors: Tags: Am J Physiol Heart Circ Physiol Source Type: research
In ordered subsets expectation maximization (OSEM) reconstruction of electrocardiography (ECG)-gated myocardial perfusion single-photon emission computed tomography (SPECT), it is often assumed that the image ...
Source: EJNMMI Physics - Category: Radiology Authors: Tags: Original research Source Type: research
This is a previously healthy male teenager who was awoken by chest pain.  He was seen at another hospital and found to have a slightly elevated troponin, then underwent a CT pulmonary angiogram (PE) protocol which revealed a right sided pneumonia.  He was treated with Ceftriaxone and azithromycin.p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Calibri; background-color: #fefefe}The pain is described as located in the midsternal area, radiating to the right arm, described as 8-9/10 and worse with deep inspirations.  He endorsed cough, fever, and body aches in the previous day...
Source: Dr. Smith's ECG Blog - Category: Cardiology Authors: Source Type: blogs
Conclusions This study revealed that LBBB patients with discordant T wave in lateral leads have significantly higher ischemic scores and worse functional parameters with more dyssynchrony in gated SPECT MPI.
Source: Clinical Nuclear Medicine - Category: Nuclear Medicine Tags: Original Articles Source Type: research
AbstractBackgroundThe prognostic value of myocardial perfusion imaging (MPI) in patients with known coronary artery disease (CAD) and high exercise capacity is still unknown. We sought to determine the MPI additional prognostic value over electrocardiography (ECG) stress testing alone in patients with known CAD who achieved  ≥ 10 metabolic equivalents (METs).Methods and ResultsWe evaluated 926 patients with known CAD referred for MPI with exercise stress. Patients were followed for a mean of 32.4  ± 9.7 months for the occurrence of all-cause death or nonfatal myocardial infarction...
Source: Journal of Nuclear Cardiology - Category: Nuclear Medicine Source Type: research
In conclusion, T2D impairs vascular function by dysregulated autophagy. Therefore, autophagy could be a potential target for overcoming diabetic microvascular complications. To What Degree Does Loss of Skeletal Muscle with Age Contribute to Immunosenescence? https://www.fightaging.org/archives/2019/11/to-what-degree-does-loss-of-skeletal-muscle-with-age-contribute-to-immunosenescence/ Sarcopenia, the progressive loss of muscle mass and strength, is characteristic of aging. A perhaps surprisingly large fraction of the losses can be averted by strength training, but there are nonetheless inexorable process...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
A middle-aged woman was found down in her apartment unconscious. She was in shock with thready pulses.A prehospital ECG was recorded:Limb leads:Precordial LeadsWhat is the therapy?This is pathognomonic of hyperkalemia (I suppose it could be due to a massive overdose of a sodium channel blocking drug, maybe).Is it ventricular tachycardia (VT) due to hyperK or is it a supraventricular rhythm with hyperK? ---I don't think that it is possible to say for certain, and it does not matter.  The rate is not fast enough to be causing shock, so if it is VT, the priority is still to treat hyperK and secondarily to cardiovert...
Source: Dr. Smith's ECG Blog - Category: Cardiology Authors: Source Type: blogs
Written by Pendell Meyers, submitted by Siva Vittozzi-WongA man in his 30s with history of hypertension, hyperlipidemia, and diabetes presented with chest pain which started 12 hours prior to presentation. The pain was described as pressure, constant for 12 hours, radiating to the jaw, with left arm numbness. Initial vitals were significant for bradycardia at 45 beats per minute.Here is his presenting ECG with active pain:What do you think?Here was the prior EKG on file:The emergency medicine resident (who has received lectures from me on hyperacute T-waves, suble OMI, etc) documented the following interpretation:" In...
Source: Dr. Smith's ECG Blog - Category: Cardiology Authors: Source Type: blogs
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