<prompt> Which of the following fits into the criteria of severe variable deceleration, variation less than ___90 beats per minute lasting for 60 seconds80 beats per minute lasting for 60 seconds100 beats per minute lasting for 60 seconds70 beats per minute lasting for 60 seconds  <response>: Severe variable decelerations are defined as: Less than 70 beatsminute lasting at least 60 seconds. Variable deceleration is the abrupt decrease in FHR below the baseline. The decrease is 15 beatsminute or more, with a duration of 15 seconds or more but less than 2 minutes. Mechanism: Umbilical cord compression, leads to occlusion of the umbilical vein, hence there is decreased venous return to maintain cardiac cord. Classification: Mild: More than 80bpm irrespective of durationless than 30 seconds irrespective of HR70-80 bpm lasting 60 seconds Moderate: More than 70 bpm lasting 30-60 seconds70-80 bpm lasting more than 60 seconds Severe: Less than 70 bpm lasting at least 60 seconds Ref: Nelson textbook of pediatrics 21st edition PGno: 884 