Heart

American researchers have 3D-bioprinted a miniature human heart, using human cardiac cells.

​​​​A beating heart relies on a healthy circuitry of electrical signals to maintain a steady rhythm. Scientists are now reporting a new potential treatment for when things break down, using fine carbon threads as electrical bridges to keep the signals circulating. ​

​Considering how important an organ it is, it’s a shame that the heart is so bad at repairing itself. Stem cells are an emerging solution, and now researchers at the Universities of Cambridge and Washington have combined heart muscle cells and supportive cells to help mend broken hearts.

The distant scientific objective of 3D printed human organs has now grown a little bit closer, with researchers at Carnegie Mellon University reporting a breakthrough that enabled the printing of full-scale heart components that in some cases functioned similarly to the real thing.

Cardiovascular diseases are the number one killer in the world – and we might have a two million year old ancestor to blame. A team pinpointed a single gene that ancient ancestors lost, which appears to have predisposed us as a species towards higher rates of atherosclerosis than other apes.

The heart is notoriously fragile, having quite a lot of difficulty in repairing itself after sustaining damage. But now, researchers from the University of Calgary have found a previously unidentified cell population in the fluid that surrounds the heart, which seems to help heal injuries.

​We've already heard about so-called "electronic tattoos," which are a more comfortable and longer-wearing alternative to the rigid electrodes traditionally used to monitor cardiac patients' hearts. A new one is claimed to be more accurate than others, however, as it tracks heart health in two ways.

After a heart attack this vital organ remains damaged, which can eventually lead to heart failure and death. Now, researchers have managed to use placental stem cells to regenerate heart cells in mice, which could lead to groundbreaking new treatments for heart attack victims.

​For some time now, we've seen surgical devices that can be remotely guided within the body. And while they do make surgery more precise, they still have to be continuously operated by a surgeon. Recently, however, a robotic catheter successfully navigated beating pig hearts on its own.

​Although pieces of heart tissue have previously been bioprinted, scientists have now succeeded in creating the world's first 3D-printed vascularized heart to be made from a patient's own biological materials. It's an accomplishment that could pave the way for custom-made replacement organs.

The main risk factors for heart disease are lifestyle choices like a bad diet, smoking, lack of exercise – and poor sleep. That last point has gone relatively unstudied, but new research out of Harvard has found the chemical chain reaction that links disrupted sleep and cardiovascular disease.

A massive new study carried out by Stanford scientists together with Apple hints at a future where the Apple Watch could be used to detect irregular heartbears, with the device able to detect such events in a meaningful amount of users.​