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Timing Of Women's Labor May Determine Effectiveness Of Pain Medication

It has now been found out that women who had day labor got longer pain relief than women with night labor with the same amount of labor pain medicine. This could be due to the impact of natural daily body rhythms // that may influence the effectiveness of spinal-epidural pain medication for women in labor.

Therefore the time of administration of the medication is regarded to be an important factor in determining its effectiveness. In the future, doctors may consider time of day, as well as patient's weight and other factors, when determining the best dose or method of drug delivery. The study's goal was to determine if the body's natural internal rhythms can affect the effectiveness of pain medication for laboring women. The study, involved 77 women who were in labor with their first babies and requested spinal-epidural pain medication.

The biological rhythms studied include the circadian rhythm, the 24-hour body clock, and the ultradian rhythm, shorter-than-24-hour-cycles, which determine sleeping and eating patterns and can also affect blood pressure, heart rate and body temperature. Some rhythms are controlled by sunlight and others are controlled internally.

The researchers found that women who labored between noon and 6 p.m. got an average of 27 percent longer pain relief from a single dose of the spinal-epidural medication fentanyl than women whose labor was between 8 p.m. and 2 a.m. This is one of the first studies to examine whether there are chronobiological variations in the effectiveness of a drug for labor pain relief.

Knowing more about how time of administration influences the drug's effects could have significant practical implications for how it is prescribed and delivered. For example, the dose could be tailored to the time of day or a smart, programmable, time-released version of the drug could be developed to optimize desired drug effects and minimize undesired side effects both for women in labor and pati ents with other pain syndromes.

Furthermore, the right treatment given at the wrong time can be ineffective or create a crisis of escalating toxicity. Conversely, even a weak treatment, if given at the right moment, could prove surprisingly effective.


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