Heart conduction disease

This study tested different treatments for autonomic dysfunction, including POTS, in 381 adults with Long COVID. It compared non-drug approaches and medications to see which best eased symptoms like rapid heart rate and dizziness. The goal was to find effective ways to manage the…

This study tests whether intravenous immunoglobulin (IVIG) can reduce symptoms of autonomic dysfunction—such as dizziness, rapid heartbeat, and fatigue—in people with long COVID. Two hundred participants will receive either IVIG or a placebo (saline) for 9 months, plus coordinate…

This study tests a new pacing lead (Solia CSP S) placed deep in the heart to treat slow heart rhythms. About 192 people with heart block or sinus node problems will get the lead. The main goals are to check safety (no serious device issues in 3 months) and how often the lead is p…

This study tested whether placing the left ventricle lead of a cardiac resynchronization therapy (CRT) device at the heart's latest electrical activation spot improves outcomes. It included 1,000 heart failure patients with bundle branch block. The goal was to see if this targete…

This study tested a procedure called radiofrequency catheter ablation in 20 people with Brugada syndrome, a heart condition that can cause dangerous heart rhythms. Half received the real ablation, which uses heat to destroy small areas of heart tissue thought to cause the problem…

This study tested a new type of pacemaker that doesn't use wires (leads) to help both the upper and lower chambers of the heart beat in sync. It involved 464 people with slow heart rhythms who needed a pacemaker. The main goals were to see if the device was safe and worked well a…

This study compared a newer pacing method, called HIS or left bundle branch (LBB) pacing, to the standard biventricular pacing in 150 heart failure patients with a specific heart electrical problem (left bundle branch block). The goal was to see if the new method could improve he…

This study tested a newer pacing method (left bundle branch area pacing) against the standard method (right ventricular pacing) in 486 adults with atrioventricular block, a condition where the heart's electrical signals are delayed. The goal was to see if the newer method better …

This study tested whether colchicine, an anti-inflammatory drug used for gout, can prevent new-onset atrial fibrillation and the need for a permanent pacemaker in people undergoing transcatheter aortic valve replacement (TAVI). About 120 older adults with severe aortic stenosis w…

This trial tests whether a 12-week ketogenic diet program, delivered entirely online, is practical and acceptable for adults with Long COVID who also have ME/CFS and dysautonomia. Participants follow a low-carb, high-fat diet with vitamin B1 and electrolyte support, plus weekly v…

This study tests a single dose of an experimental drug called REGN7544 in 82 people with Postural Orthostatic Tachycardia Syndrome (POTS). The goal is to see if the drug safely reduces the rapid heart rate that happens when standing up. Researchers will also check for side effect…

This study tested whether wearing a virtual reality headset during heart device implantation (like pacemakers) could reduce patients' anxiety and pain. 111 adults were randomly assigned to use VR or standard care. The goal was to see if distraction through VR lowers stress and di…

This small pilot study tested whether mirabegron, a drug typically used for overactive bladder, can raise blood pressure and reduce fainting in people with POTS who have low blood pressure that standard treatments didn't help. Twenty adults took either 25 mg or 50 mg of the drug …

This pilot study tested whether a 12-week aquatic occupational therapy program could reduce symptoms and improve quality of life in people with Postural Orthostatic Tachycardia Syndrome (POTS). Five adults with POTS completed three 60-minute pool sessions per week, including gent…

This completed Phase 2 trial tested whether ivabradine, a drug that slows heart rate, can reduce symptoms like dizziness and rapid heartbeat in people with long COVID. 181 participants received either ivabradine or a placebo for 3 months, with follow-up for another 3 months. The …

This completed study looked at 90 people with lower back pain from conditions like herniated discs or spinal stenosis. Researchers compared two different target areas for injecting numbing medicine during a lumbar spine block to see which provides better pain relief and blood flo…

This study tested a device that gently stimulates a nerve in the neck (called nVNS) to see if it can reduce symptoms like dizziness and fatigue in teenagers with POTS, a condition that causes a rapid heart rate upon standing. Forty teens with newly diagnosed POTS took part at May…

This study looks at whether it is safe and possible to do a special exercise test (MRI combined with a bike workout) in 20 people who already have a specific type of pacemaker. The goal is to see how different pacemaker settings affect the heart's pumping ability during light exe…

This study looks at whether postural tachycardia syndrome (POTS) is caused by an autoimmune reaction. Researchers are testing if electrical stimulation of the vagus nerve can improve symptoms, reduce inflammation, and calm the immune system. The study includes 80 people with POTS…

This study looks at tiny nerve fibers in the skin of people with Long COVID, POTS, diabetic neuropathy, and those who had COVID-19 without lasting symptoms. By comparing skin samples, researchers hope to find unique patterns that help explain ongoing symptoms like pain and dizzin…

This small, completed study tested whether special pacing signals from a pacemaker could help control blood pressure in people with slow heartbeats. Five adults who needed a pacemaker or similar device took part. Researchers measured blood pressure and heart function during brief…

This study looks at how inherited heart rhythm problems (like Long QT Syndrome) and heart muscle diseases (like Hypertrophic Cardiomyopathy) affect the quality of life and physical activity of children aged 6 to 18. Researchers will compare 107 children with these conditions to 1…

This study tested whether individually adjusting the timing (atrioventricular delay) of a pacemaker improves heart function in 39 adults with conduction system pacing. Researchers used echocardiography to optimize settings and measured changes in heart strain, pumping ability, an…

This study tested a new way to predict dangerous heart rhythm problems after a common heart valve procedure called TAVR. Researchers combined ECG results with CT scan measurements and implant depth to see if they could safely identify low-risk patients. The study looked back at 2…

This study looked at 18 heart failure patients with a specific heart block to find the best spots for pacing the heart's natural electrical system. Doctors used a 3D mapping system during device implant to see where pacing corrects the heart's rhythm. The goal was to gather infor…

This completed Phase 1 study at Vanderbilt University looked at how the renin-angiotensin-aldosterone system works in people with POTS, a condition that causes a rapid heart rate and dizziness upon standing. Researchers gave 28 participants (including healthy controls) a one-hour…