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Age-Dependence of Flow Homeostasis in the Left Ventricle
Conclusions: In average, blood spends 1 to 3 beats inside the LV with very low shear stress rates. The apical region is the most prone to blood stasis, particularly in mid-aged adults. The washout of blood in the normal LV is age-dependent due to physiological changes in the degree of apical penetration of the filling waves. Introduction Cardioembolic stroke is a major source of mortality and disability worldwide and blood stasis one of its major determinants (Adams et al., 1986). Left ventricular (LV) function has evolved to maximize mechanical efficiency and ensure organ perfusion at a low cost of energy and fill...
Source: Frontiers in Physiology - April 25, 2019 Category: Physiology Source Type: research

Heart rate and dyssynchrony in patients with cardiac resynchronization therapy: a pilot study.
The objective of this pilot study was to describe the impact of paced heart rate on left ventricular (LV) mechanical dyssynchrony in synchronous compared to dyssynchronous pacing modes in patients with heart failure. METHODS: Echocardiography was performed in 14 cardiac resynchronization therapy (CRT) patients at paced heart rates of 70 and 90 bpm in synchronous- (CRT), and dyssynchronous (atrial pacing + wide QRS activation) pacing modes. LV dyssynchrony was quantified using the 12-segment standard deviation model (Ts-SD) derived from Tissue Doppler Imaging. In addition, cardiac cycle intervals were assessed using...
Source: Scandinavian Cardiovascular Journal - March 27, 2017 Category: Cardiology Tags: Scand Cardiovasc J Source Type: research

MassDevice.com +5 | The top 5 medtech stories for November 14, 2016
Say hello to MassDevice +5, a bite-sized view of the top five medtech stories of the day. This feature of MassDevice.com’s coverage highlights our 5 biggest and most influential stories from the day’s news to make sure you’re up to date on the headlines that continue to shape the medical device industry. Get this in your inbox everyday by subscribing to our newsletters.   5. Final FDA rules clarify adverse event reporting for contract manufacturers The FDA last week issued final guidance for medical device companies on the requirements for reporting adverse events that walked back much of the burde...
Source: Mass Device - November 14, 2016 Category: Medical Equipment Authors: MassDevice Tags: News Well Plus 5 Source Type: news

Biotronik launches Itrevia MRI-safe quad CRT-D in Japan
Biotronik said today that it launched its Itrevia MRI-safe quad cardiac resynchronization therapy defibrillator in Japan, part of a Japanese rollout of new devices for 2015. The device is equipped with home monitoring connectivity, as well as compatibility with up to 1.5 tesla MRI machines, the German medical device giant said. “As a producer of superior medical technologies, it is imperative for us to have a presence in the world’s leading technologies market. It also makes sense that the world’s biggest producer of ProMRI technology should have a strong presence in the country where MRI scanning is the...
Source: Mass Device - July 2, 2015 Category: Medical Equipment Authors: Fink Densford Tags: Cardiac Assist Devices Cardiac Implants Cardiovascular Surgical Biotronik Source Type: news