What term identifies any deviation from normal pattern of the heartbeat?

How many churches in the US with less than 50 members? What is 192 in roman numerals? How to write the number 29021392961234 to be written as international system of numeration? What is 96.9898 to 3 decimal places? How is rounding to nearest tens similar to rounding to the nearest thousand? How many less than 40 is 23? How many sides does a polygon have if the interior angles equal 108? How do you find the volume of a rectangular isosceles triangle? How many years is it from 1988 to 2015? How do you convert a number to base 5? Which plane of refernce would always divide a four-legged animal into two equal halves that are mirror images of each other? How do you write 5.5 as a mixed number? What is the angle measure for each of the angles on a regular 50 - gon? Why isn't 5-5 not equivalent fraction? How do you write 25 over 81 in simplest form? How do you completely factorise x to the fourth power minus x to the third power minus x minus 1? What is 350 in c? What is the only dimension a line has? What are the highest common factors of 26 39 and 52? What is 248 minus 500?

What term identifies any deviation from normal pattern of the heartbeat?