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The sawtooth pattern of atrial flutter is obvious in the inferior leads. 2:1 AV conduction becomes 4:1 after 5 beats, resulting in 5 beats being grouped together. During the cycle of 5 beats, each QRS ...

Low core/biface ratios are often linked to high mobility, and high ratios to more sedentary lifestyles. The Paleoindian Allen site assemblage exhibits low core/biface ratios among recovered artifacts ...

Note in lead V5 rhythm strip how the amplitude of the QRS complexes vary, however not beat to beat as would be seen in electrical alternans. This variation can occur with the respiratory cycle as the ...