Samuel Emil Schmidt
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View article: Deep learning-based beat-to-beat delineation of heart sounds and fiducial points in seismocardiography
Deep learning-based beat-to-beat delineation of heart sounds and fiducial points in seismocardiography Open
Introduction The application of deep learning methods in automatic delineation of fiducial points in seismocardiography (SCG) on a beat-to-beat basis provides the possibility of obtaining a novel and comprehensive approach to assess and mo…
View article: Monitoring of respiration and cardiorespiratory interactions from multichannel seismocardiography signals
Monitoring of respiration and cardiorespiratory interactions from multichannel seismocardiography signals Open
Seismocardiography (SCG) uses accelerometers to record cardiac-induced accelerations of the chest wall. Cardiorespiratory interactions cause changes in amplitude and morphology of the SCG signals. Accelerometers can also directly monitor r…
View article: Non-exercise estimation of peak oxygen uptake in patients with ischaemic heart disease and heart failure using seismocardiography
Non-exercise estimation of peak oxygen uptake in patients with ischaemic heart disease and heart failure using seismocardiography Open
Aims Knowledge of cardiorespiratory fitness (i.e. VO2peak) is important for determining prognosis and prescribing exercise for patients with heart disease undergoing cardiac rehabilitation (CR) programmes. In this explorative study, we inv…
View article: Estimation of cardiorespiratory fitness in healthy using seismocardiography
Estimation of cardiorespiratory fitness in healthy using seismocardiography Open
Cardiorespiratory fitness expressed as maximal oxygen consumption (V̇O 2max ) is a strong predictor of cardiovascular health, but its measurement through cardiopulmonary exercise (CPX) testing is complex and costly. This study develops and …
View article: Evaluation of seismocardiography in detecting pre-load changes and cardiovascular disease: a comparative study with transthoracic echocardiography
Evaluation of seismocardiography in detecting pre-load changes and cardiovascular disease: a comparative study with transthoracic echocardiography Open
Aims This study aimed to test whether seismocardiography (SCG) can detect changes in loading conditions and detect significant differences in SCG signals between healthy individuals and those with cardiovascular disease (CVD). Methods and …
View article: Accelerometer-based estimation of respiratory rate using principal component analysis and autocorrelation
Accelerometer-based estimation of respiratory rate using principal component analysis and autocorrelation Open
Objective.
Respiratory rate (RR) is an important vital sign but is often neglected. Multiple technologies exist for RR monitoring but are either expensive or impractical. Tri-axial accelerometry represents a minimally intrusive solutio…
View article: Noise reduction in abdominal acoustic recordings of maternal placental murmurs
Noise reduction in abdominal acoustic recordings of maternal placental murmurs Open
Fetal phonocardiography is a well-known auscultation technique for evaluation of fetal health. However, murmurs that are synchronous with the maternal heartbeat can often be heard while listening to fetal heart sounds. Maternal placental m…
View article: Porcine Model for Validation of Noninvasive Estimation of Pulmonary Hypertension
Porcine Model for Validation of Noninvasive Estimation of Pulmonary Hypertension Open
The diagnosis of pulmonary hypertension (PH) is often delayed in the course of the disease, contributing to its high mortality rate. Seismocardiography (SCG) is non-invasive and less time-consuming and could potentially replaceechocardiogr…
View article: Evaluating Seismocardiography as a Non-Exercise Method for Estimating Maximal Oxygen Uptake
Evaluating Seismocardiography as a Non-Exercise Method for Estimating Maximal Oxygen Uptake Open
Background: The value of maximal oxygen uptake (VO2MAX) is a key health indicator. Usually, VO2MAX is determined with cardiopulmonary exercise testing (CPET), which is cumbersome and time-consuming, making it impractical in many testing sc…
View article: Clinical risk prediction, coronary computed tomography angiography, and cardiovascular events in new-onset chest pain: the PROMISE and SCOT-HEART trials
Clinical risk prediction, coronary computed tomography angiography, and cardiovascular events in new-onset chest pain: the PROMISE and SCOT-HEART trials Open
Background and Aims Whether index testing using coronary computed tomography angiography (CTA) improves outcomes in stable chest pain is debated. The risk factor weighted clinical likelihood (RF-CL) model provides likelihood estimation of …
View article: Seismocardiography and echocardiography: the correlation in the systolic complex
Seismocardiography and echocardiography: the correlation in the systolic complex Open
Aim . This study aimed to investigate the correlation between seismocardiographic and echocardiographic systolic variables and whether a decrease in preload could be detected by the seismocardiography (SCG). Methods . This study included a…
View article: Clinical likelihood models calibrated against observed obstructive coronary artery disease by computed tomography angiography
Clinical likelihood models calibrated against observed obstructive coronary artery disease by computed tomography angiography Open
Background Models predicting the likelihood of obstructive coronary artery disease (CAD) on invasive coronary angiography are available.(1,2) However, as stable de novo chest pain patients frequently have lower clinical likelihood and pref…
View article: DARE-ISC model for prediction of 1-year ischaemic stroke risk in the general population and atrial fibrillation patients: a Danish nationwide cohort study
DARE-ISC model for prediction of 1-year ischaemic stroke risk in the general population and atrial fibrillation patients: a Danish nationwide cohort study Open
Objectives To develop a risk assessment model (DAnish REgister Ischaemic Stroke Classifier, DARE-ISC) for predicting 1-year primary ischaemic stroke/systemic embolism (SE) in the general population. Secondly, to validate the accuracy DARE-…
View article: External validation of novel clinical likelihood models to predict obstructive coronary artery disease and prognosis
External validation of novel clinical likelihood models to predict obstructive coronary artery disease and prognosis Open
Objectives The risk factor-weighted and coronary artery calcium score-weighted clinical likelihood (RF-CL and CACS-CL, respectively) models improve discrimination of patients with suspected obstructive coronary artery disease (CAD). Howeve…
View article: A Comparison of Infrasonic and Audio Components in the Seismocardiogram
A Comparison of Infrasonic and Audio Components in the Seismocardiogram Open
In an earlier study, based on ECHO, we showed that the opening of the aorta valve happens before the peak in the SCG that many authors have associated with this event. Within the audible band of the acceleration signal a transient event is…
View article: Cross-Domain Detection of Pulmonary Hypertension in Human and Porcine Heart Sounds
Cross-Domain Detection of Pulmonary Hypertension in Human and Porcine Heart Sounds Open
Detection of Pulmonary Hypertension (PH) via the automated analysis of cardiac auscultation may offer a non-invasive, accurate, and reliable solution with low resource requirements. We detect PH in human and in porcine datasets and demonst…
View article: Detecting Preload Changes Using Seismocardiography
Detecting Preload Changes Using Seismocardiography Open
Seismocardiography (SCG) is a non-invasive tool that utilizes the chest wall vibrations from the beating heart to measure cardiac movements through a highly sensitive accelerometer. SCG offers continuous measurement of cardiac function tha…
View article: Automatic Detection of Acoustic Window During Routine Echocardiographic Imaging
Automatic Detection of Acoustic Window During Routine Echocardiographic Imaging Open
Ultrasound remains an attractive option for cardiac imaging due to its real-time imaging capabilities and high temporal resolution. One key challenge in echocardiographic imaging is locating an optimal acoustic window for generating high-q…
View article: Thermal Infrared Imaging for Investigating Changes of Vasomotion in Peripheral Circulation
Thermal Infrared Imaging for Investigating Changes of Vasomotion in Peripheral Circulation Open
Background & aim: In 2017, WHO estimated 48.9 million incident cases of sepsis worldwide, with 11 million sepsis related deaths. In early stages of sepsis microcirculatory function is impaired. An expression for general microcirculatory fu…
View article: Combining Polygenic and Proteomic Risk Scores With Clinical Risk Factors to Improve Performance for Diagnosing Absence of Coronary Artery Disease in Patients With de novo Chest Pain
Combining Polygenic and Proteomic Risk Scores With Clinical Risk Factors to Improve Performance for Diagnosing Absence of Coronary Artery Disease in Patients With de novo Chest Pain Open
Background: Patients with de novo chest pain, referred for evaluation of possible coronary artery disease (CAD), frequently have an absence of CAD resulting in millions of tests not having any clinical impact. The objective of this study w…
View article: Validity and reliability of seismocardiography for the estimation of cardiorespiratory fitness
Validity and reliability of seismocardiography for the estimation of cardiorespiratory fitness Open
The Seismofit is highly reliable in its estimation of O2peak. However, based on the measurement error and MAPE >10%, the Seismofit O2peak estimation model needs further improvement to be considered for use in clinical settings.
View article: Exercise electrocardiography for pre-test assessment of the likelihood of coronary artery disease
Exercise electrocardiography for pre-test assessment of the likelihood of coronary artery disease Open
Objectives To develop a tool including exercise electrocardiography (ExECG) for patient-specific clinical likelihood estimation of patients with suspected obstructive coronary artery disease (CAD). Methods An ExECG-weighted clinical likeli…
View article: Vibrational characterization of cavitation in left ventricular assist device
Vibrational characterization of cavitation in left ventricular assist device Open
Background The left ventricular assist device (LVAD) is a mechanical circulatory support device for patients with severe heart failure. Microbubbles caused by cavitation in the LVAD can potentially lead to physiological and pump‐related co…