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No group differences emerged, suggesting that nortriptyline was no more effective than a placebo in treating PND. This study was followed up with another RCT (Wisner et al, 2004), this time evaluating the effect of sertraline on the rate of and time to reoccurrence of postpartum depression. They highlighted a paucity of clinical trials on the impact of antidepressants in women who have previously had a depressive episode, and hence may be prone to experience a reoccurrence.

Participants were pregnant women with gestation periods of 9 months or less, and at least one episode of postpartum depression that fits that the DSM-IV definition of major depression. Women with other forms of psychopathology (e.g. psychosis, or bipolar disorder) were excluded. Participants were randomly assigned to a treatment (sertraline) or placebo group. The drug was administered immediately after birth, beginning with a 50mg/day dose, which was later dropped to 25mg/day to minimise side effects (e.g. headache). Data analysis using Fisher’s exact test showed a significant group difference in rate of reoccurrences, during a 17-week preventive treatment period.

Reoccurrences occurred in 4/8 women assigned to the placebo group, and1/14 women in the treatment condition, translating into a 0.43difference in reoccurrence rates. All women had adhered to the treatment regime, thus minimising the confounded effect of on-compliance. There was also a significant group difference in time to reoccurrence, with first reoccurrence beginning much earlier for the placebo group (at 5 weeks, followed by more reoccurrences) compared with the treatment group (at 17 weeks, followed by more reoccurrences).

However, the treatment group reported more side effects (e.g. Dizziness, drowsiness). This RCT clearly demonstrates the effectiveness of an SSRI in preventing the reoccurrence of postpartum depression, albeit the conclusiveness of these findings is constrained by the failure to control for key background variables, such as previous and recent history of psychopathology, and drug effect expectations. For example, lingering symptoms of a distant depressive episode may help precipitate a quicker reoccurrence.

Figure 2 Rate of recurrence of postpartum depression in placebo and SSRI women (Wisner et al, 2004)

Oberlander et al (2005) tested the effect of SSRI exposure on bio behavioural responses to acute procedural pain in new-born babies at2 months of age. Previous research has suggested altered behavioural and physiological reactions to a routine painful event in infants, after prenatal exposure to SSRI antidepressants. There is paucity of literature on the long-term effects of SSRIs on neuro behavioural variables, such as cognitive, language and motor development.

Given that SSRIs work by inhibiting the reuptake of serotonin(5-hydroxytrypamine [5HT], a neurotransmitter that regulates cardiovascular function and pain signals in the developing brain), and given that SSRIs easily pass through the placenta, it is possible that regions of the brain associated with pain reactivity may be affected. Participants were recru本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。