Which periodic fetal heart rate change?
•Most frequently encountered abnormal FHR pattern.
•Caused by umbilical cord compression.
•Has a variable time of onset, variable form and may be nonrepetitive.
•If cord compression is prolonged, hypoxia can be present and show a combined respiratory and metabolic acidosis.
•Severity is graded by their duration.
•Visually Apparent, abrupt (onset to nadir <30 sec) decrease in FHR below the baseline. The decrease in FHR is > or = to 5bpm below the baseline and lasts > or = 15 sec but < 2 minutes.
•Prolonged Deceleration- > or = to 15bpm below baseline lasting > or = to 2min but < 10 min