What is meant by a "controlled" ventricular rate in atrial fibrillation?

@article{Rawles1990WhatIM,
  title={What is meant by a "controlled" ventricular rate in atrial fibrillation?},
  author={JohnM. Rawles},
  journal={British heart journal},
  year={1990},
  volume={63 3},
  pages={
          157-61
        }
}
Reduction of a rapid ventricular rate in atrial fibrillation results in a longer diastolic filling period and a higher left ventricular stroke volume but this is offset by reduced contractility and fewer beats per minute; the net effect on cardiac output is uncertain. Sequences of stroke distances were measured by Doppler ultrasound in 60 resting patients with atrial fibrillation to determine the relation between ventricular rate and linear cardiac output. The slope of the cardiac output… CONTINUE READING
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