Hypertension in pregnancy is generally defined as a diastolic blood pressure of 90 mm Hg or greater or a systolic pressure at or above 140 mm Hg. Preeclampsia is defined as the development of hypertension with proteinuria or edema induced by pregnancy, generally in the second half of gestation. It is more common in women who have not carried a previous pregnancy beyond 20 weeks and in women at the extremes of the reproductive years.
Over the last several years, a number of studies have indicated that exposure to antidepressants near the time of delivery may be associated with poor neonatal outcomes. A recent prospective study from Dubnov-Raz and colleagues published in the journal Pediatrics found an association between QTc interval prolongation in neonates and antenatal exposure to selective serotonin reuptake inhibitor (SSRI) antidepressants. The QT interval is a measurement of the heart's electrical cycle from ventricular depolarization to the end of ventricular polarization. It is determined from an electrocardiogram (ECG) and is corrected for heart rate.Â
Most obstetricians are now familiar with the potential for what has become known as neonatal distress syndrome (or "adaptation" syndrome) following third trimester exposure to SSRIs. Some patients still worry about the possibility of their baby developing neonatal distress syndrome, especially if anything unusual happened during the post-delivery experience of an earlier pregnancy. Women may be concerned about whether and to what degree the medication they were on played a role in their infant's distress and whether to continue that medication during a subsequent pregnancy. The following case may help illustrate the decision-making dilemmas.
CYP3A4 is an intestinal enzyme that is part of the Cytochrome P450 metabolic system. It is important in many drug-drug and drug-food interactions, and it is one of the first enzymes to break down medications when they enter the body.
While some side effects such as nausea, dizziness, and headaches associated with selective serotonin reuptake inhibitor (SSRI) antidepressants tend to decrease or resolve over time, other side effects such as sexual dysfunction rarely remit spontaneously. Treatment of sexual side effects in women is especially important when about 30-70% of patients taking antidepressants may experience sexual side effects, combined with the fact that women are prescribed antidepressants at rates of 2 to 1 when compared to men.
In 2006, Chambers and colleagues published an article linking SSRI use during late pregnancy to an increased risk of persistent pulmonary hypertension in the newborn (PPHN). Based on the results of this analysis, the authors estimated the risk of PPHN to be about 1% in infants exposed to SSRIs late in pregnancy (after 20 weeks). However, subsequent studies did not demonstrate a significant association between PPHN and SSRI usage. A new study, this one relying upon data from the Swedish Medical Birth Register, has observed an elevated risk of PPHN among SSRI-exposed infants.
Selective serotonin reuptake inhibitors (SSRIs) account for approximately 62% of all antidepressants prescribed in the United States. There have been several recent studies suggesting that SSRIs may lower bone mineral density in individuals over the age of 65. However, depression itself has been shown to decrease bone mineral density and has also been associated with an increased risk of hip fractures in older women.
St. John's wort (Hypericum perforatum) is an herbal preparation which has been shown, in some studies, to be effective for the treatment of mild to moderate depressive symptoms. St. John's wort is now one of the most commonly used herbal products in the United States and is widely used in Europe.
Women receiving tamoxifen for the treatment or prevention of breast cancer should be aware of possible drug-drug interactions with specific antidepressant medications (e.g., SSRI). These antidepressants are used widely to treat depression and anxiety disorders. In addition, multiple studies have shown that these antidepressants are an effective non-hormonal treatment for hot flashes; over 25% of women who are experiencing hot flashes related to tamoxifen therapy are now prescribed antidepressants to manage their symptoms.
November, 2006 by LEE COHEN, M.D. Over the last year, several studies on possible neonatal effects of prenatal exposure to SSRIs have been reviewed in this column. These studies have raised concerns about potential risks, [...]
