Researchers are still determining the cause of these extended symptoms, but some people with “long-haul” COVID-19 may be dealing with a known condition called postural orthostatic tachycardia syndrome ...

Figure 3. Twelve-lead ECG tracing during stress test shows the typical aspect of bidirectional ventricular tachycardia characterized by 180° alternating QRS axis on a beat-to-beat basis, with a right ...

Axcelis Technologies, Inc. engages in the manufacture of capital equipment for the semiconductor chip manufacturing industry. Its ion implantation systems product line includes high and medium ...

The paced QRS has a left bundle-branch block superior axis configuration that matched VT-1. Pacing at the site during VT (C) entrains (resets) tachycardia with a long stimulus-to-QRS interval without ...