Ventricular tachycardia can be difficult to differentiate from other causes of broad complex tachycardia. The following characteristics aid in the identification of VT.Features common to any broad complex tachycardia. Rapid heart rate (> 100 bpm). Broad QRS complexes (> 120 ms).
Eyeshine is a visible effect of the tapetum lucidum. When light shines into the eye of an animal having a tapetum lucidum, the pupil appears to glow. Eyeshine can be seen in many animals, in nature and in flash photographs.his classification does not include tapeta lucida in birds. Kiwis, stone-curlews, the boat-billed heron, the flightless kakapo and many nightjars, owls, and other night birds such as the swallow-tailed gull also possess a tapetum lucidum.
The tapetum lucidum tends to lie behind or within the retina. This specialized structure essentially reflects light to allow for another round of reabsorption into the eye. There are different types of tapeta in various groups of animals. For example, carnivores and some other creatures have a tapetum rich in crystals of a compound called guanine; this is called the tapetum lucidum cellulosum. A sea lion or walrus, by contrast, has a tapetum lucidum fibrosum, defined by fibers of collagen. The striking shine of an animal's eye in the glare of a flashlight or headlight reveals the reflective tapetum, with the color of the eyeshine -- yellow, green, blue and such -- varying between species.