This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis in obstetrics, Subject name: Gynaecology & Obstetrics
Which is most significant finding in cardiotocography for detection of fetal hypoxia? 
Select and explain. 
A. Late deceleration, B. Variable deceleration, C. Sinusoidal deceleration, D. Early deceleration
A: Late deceleration
Answer: A: Late deceleration 
Explanation: Late deceleration: Begins at or after the contraction peak and touches the baseline only after the end of contraction.It has a smooth and gradual onset and recovery and magnitude is rarely >40bpm.It is classically caused by uteroplacental insufficiency and indicates hypoxia. Most common causes are maternal hypotension following epidural and hyperstimulation due to oxytocics. TEXTBOOK OF OBSTETRICS, SHEILA BALAKRISHNAN ,Pg no:521,2nd edition