Summary: To characterize the impact of orthostatic hypotension (OH) and reflex syncope on signals measured using a wearable cardiac monitor prototype device. To evaluate the relationship of signals measured from the wearable cardiac monitor prototype device with reported symptom severity of orthostatic intolerance per standard data collection, analysis, and questionnaires.

Summary: The primary purpose of this investigation is to determine whether water carbonation can improve orthostatic tolerance in healthy control volunteers. Orthostatic tolerance refers to the ability to maintain an adequate blood pressure when standing. In some individuals blood pressure can fall when standing, predisposing to dizzy spells or fainting episodes. Drinking water can boost blood pressure and...

Summary: The investigators will assess the efficacy of clinically recommended counterpressure maneuvers (CPM) in preventing syncope for paediatric patients. Participants presenting to the emergency department (ED) will first provide written informed consent. In stage I, they will be asked to complete a brief survey documenting the presentation of their syncopal episode, and any prodromal symptoms they expe...

Summary: The incidence and severity of hot weather and extreme heat events (heat waves) is increasing. As such, there is an urgent need to develop heat-alleviation strategies that can provide targeted protection for older adults who are at an elevated risk for heat-induced illnesses or death due to impaired body temperature and cardiovascular regulation. While air-conditioning provides the most effective p...

Summary: Today, phacoemulsification has become the most commonly applied method in the treatment of cataract, which is considered as a public health problem. Since the eyelid margins can be a source for pathogens in phacoemulsification surgery draping after skin sterilization is applied to remove the eyelashes from the operation area. Since surgical drapes are airtight, carbon dioxide (CO2) accumulation oc...

Summary: This research study is being done to evaluate the effectiveness of using the sharpened Romberg test to screen for impaired postural control in patients with impaired or altered breathing patterns.

Summary: The goal of this observational study is to examine the clinical presentations, the diagnostic tests performed and the management of patients presenting with transient loss of consciousness (TLOC) The main questions it aims to answer are: prevalence of TLOC prevalence of different diagnoses leading to TLOC Demographic, clinical, paraclinical and biological data will be collected from the emergency ...

Summary: The purpose of this study is to use MRI images using the OS-CMR technique to view the differences in the hearts of healthy volunteers and participants with a condition called Metabolic Syndrome. Our objectives for this project are to compare these two groups and to view how health risks, blood test results, and the time since a Metabolic diagnosis can affect heart health.

Summary: This study aims to view variations in MRI measurements of the heart and the brain in people with anxiety versus healthy volunteers. The MRI measurements used will be Oxygenation-Sensitive Cardiac MRI (OS-CMR), a recent type of MRI which is safe, fast, and non-invasive.

Summary: Breathing maneuvers, i.e. hyperventilation followed by breath-holding, have been shown to change coronary dynamics; hyperventilating narrows the coronary arteries, puts stress on the heart, and increases the heart rate, whereas breath-hold dilates the coronary arteries and decreases the heart rate, rest. Heart rate response to hyperventilation has been reported to have high diagnostic accuracy to ...

Summary: The Investigators aim to: Study the effect of hyperventilation on the development of paradoxical vocal cord movement (PVCM) in healthy individuals and in patients with mild and severe asthma, Relate PVCM to airway symptoms and measurements of intra- and extra-thoracic airway hyperresponsiveness (ET-AHR), Evaluate the effects of inhaled anti-cholinergic agents on PVCM induced by hyperventilation. H...

Summary: Syncope (fainting) is a common reason for emergency department (ED) presentation. Fainting can be caused by heart conditions such as irregular heart rhythm (arrhythmia) that can be life-threatening, structural heart problems, or serious conditions not related to the heart. The standard or usual treatment for the majority of patients at-risk for irregular heart rhythm is getting discharged home wit...