Chris Pratt: 'I have great respect for the animals that I kill'. The Jurassic World star on why he hunts, growing up âdirt poorâ and making the shift from comic shlub to blockbuster hero. Alex Godfrey. Saturday 6 June 2015 07.00 EDT Last modified on Tuesday 20 September 2016 10.12 EDT.
First Degree Heart Block Overview. What is a first degree heart block? A person with first degree heart block has a delay in the electrical impulse that travels through the heart. An electrical impulse stimulates the muscle fibers in the heart to contract. The impulse spreads through the heart in a very organized manner, so that the atria contract first, followed by the ventricles.
Causes of First Degree Heart Block. Many highly conditioned athletes with an increased vagal tone have a first degree heart block. Vagal tone is an intrinsic inhibition of heart beats by the vagal nerve that is responsible for slowing down the heart. Other causes of first degree heart block are: Infectious disease â such as Lyme disease, which is associated with carditis (a heart complication of the disease) and usually found in children; viruses can also cause myocarditis or inflammation of the heart muscles.