Study Basics
Randomized Clinical Trial
What receptor system is primarily targeted by ketamine/esketamine?
NMDA/glutamate system
At postpartum day 7, was the rate of PPD higher in the esketamine or placebo group?
Placebo group
How do you differentiate baby blues from PPD?
Baby Blues
What type of bias does randomization primarily help to reduce?
How many women were randomized?
298 women
When was the initial esketamine dose administered in relation to delivery?
Immediately after delivery
What percentage of the esketamine group developed PPD at day 7?
23%
At what score on the EPDS is it considered suggestive for depression warranting clinical evaluation?
Score of 10 or higher
**10 or lower is low risk for depression
**13 or higher is standard clinical cutoff indicating likely depressive illness
What was the placebo control?
Saline
What surgical procedure did all participants undergo?
Elective cesarean delivery
How long did patients receive postoperative esketamine via PCA?
48 Hours
What percentage of the control group developed PPD at day 7?
35.3%
What is the maximum possible EPDS score?
30
Name one major limitation.
1. Single center study in China.
**This may limit generalizability to other hospitals, populations, healthcare systems, and patient demographics.
2. Confounding factors of PPD were not collected.
**Socioeconomic status, emotional support from spouse/family, stressful events
3. End point for the study was at 42 days (peak of PPD manifestation).
**Long term sustainability of treatment response beyond this period is uncertain
Name one characteristic that strengthen this study's internal validity.
1. Randomized
2. Double Blind
3. Placebo controlled
What was the total perioperative esketamine regimen used in this study?
0.25 mg/kg IV immediately after delivery,
50 mg of esketamine through a pain pump 2mL/hour for 48 hours.
What was the odds ratio for PPD at day 7 and what does this mean?
The odds ratio was 0.55 and this means that the odds of PPD were lower in the esketamine group compared to the control - about 45% lower odds.
What were participants' baseline EPDS score? What does this score tell you?
They were very low, around 4 in both groups.
Prior to elective C-section the patients were not suggestive of suffering from depression based on the EPDS.
**This was a prevention-focused population undergoing elective C-section rather than a treatment trial of women with established depression diagnosis.
Why is it important to determine whether a study uses a screening tool vs a formal clinical evaluation?
The EPDS is a screening instrument not a diagnostic tool. An elevated score suggests possible depression but does not confirm MDD. Findings may not directly reflect rates of clinically diagnosed PDD.
What was the primary outcome used to assess PPD?
Edinburgh Postnatal Depression Scale (EPDS)
Why might the immediate postpartum/perioperative period be an interesting time to give a rapid-acting antidepressant?
It may provide rapid antidepressant effects during a period of increased vulnerability to postpartum depressive symptoms
Ketamine/esketamine also has analgesic effects
At which postpartum time point did the significant difference between groups disappear?
After day 7.
There was no significant difference at days 14, 28, or 42.
It limits how confidently we can generalize the findings to women with moderate/severe depression or established MDD
You are the attending psychiatrist. Based ONLY on this study, what is the biggest question you would want answered before routinely recommending perioperative esketamine to prevent PPD?
Whether short-term reduction in depressive symptoms translates into a sustained clinically meaningful reduction in PPD particularly in broader/higher-risk populations.