Transcutaneous Nerve Stimulation Relieves Pain in Office-Based Hysteroscopy

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Electrical current was delivered via electrodes placed on either side of the spinal cord at the T10-L1 and S2-S4 levels.
Electrical current was delivered via electrodes placed on either side of the spinal cord at the T10-L1 and S2-S4 levels.

Results from a randomized trial published in Obstetrics & Gynecology show that patients who received transcutaneous electrical nerve stimulation (TENS) during office-based hysteroscopy without sedation had less pain and higher patient satisfaction compared with a placebo group.1

Although in-office hysteroscopy is associated with increased safety and reduced complication rates, it may not be performed as frequently as possible because of pain management issues.2,3 Previous findings show that a significant number of women are not able to benefit from office-based hysteroscopy because of pain.4

Researchers at CEU Cardinal Herrera University, Valencia, Spain assigned 46 women to each of 3 groups: a control group; an active  TENS group, in which participants were connected to a TENS unit via electrodes that were placed on either side of the spinal cord at the T10-L1 and S2-S4 levels and delivered electrical current; and a placebo group, in which electrodes were placed in the same locations, but did not deliver electrical stimulation from the TENS unit. The active TENS group received self-adjusted, high-frequency TENS that varied randomly between 80 and 100 Hz, with a pulse duration of 400 microseconds.

The main study outcome was pain levels, which were self-reported using visual analog scale (VAS) scores (0 to 100 mm) assessed at 5 different points: baseline, on entry of the hysteroscope into the cervical channel, on contact with the endometrium, immediately postbiopsy (performed if the exam revealed abnormal findings), and 5 minutes after the end of the procedure.

The analysis of participants' VAS scores showed a clinically relevant reduction in pain (defined as a minimum 10-mm difference) in the active TENS group vs placebo at 3 of the stages examined:

  • entry: −11 mm (95% confidence interval [CI], −17 to −5 mm; P <.001);
  • contact: −21.9 mm (95% CI, −30 to −13.9 mm; P <.001); and
  • biopsy: −30.5 mm (95% CI, −47.1 to −13.8 mm;  P <.001).

In addition, the active TENS group reported higher patient satisfaction vs placebo on a 0 to 10 rating scale (1.3; 95% CI, 0.5-2.2; P =.001). There were no between-group differences in terms of vital signs, vasovagal symptoms such as dizziness and nausea, or adverse events such as skin allergy.

"The advantages of TENS include it being inexpensive, quick, easy to use, noninvasive, safe, free from any side effects, and it does not require the injection of any drugs that may cause undesirable reactions," the authors wrote. The higher patient satisfaction ratings for TENS further suggest that the use of the procedure could increase acceptance and use of office-based hysteroscopy.

Summary and Clinical Applicability

In this randomized, double-blind trial, the use of TENS during office-based hysteroscopy without sedation resulted in decreased pain and greater patient satisfaction compared with placebo and control groups.

Limitations and Disclosures

The study used a rigid hysteroscope, which, although associated with faster performance, higher success rates, and lower cost, is also linked with higher discomfort and lower patient satisfaction compared with a flexible hysteroscope. This limits generalization of the findings to all in-office hysteroscopies.5

The authors report conflicts of interest pertaining to this study.

 

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References

  1. Lisón JF, Amer-Cuenca JJ, Piquer-Martí S, Benavent-Caballer V, Biviá-Roig G, Marín-Buck. Transcutaneous nerve stimulation for pain relief during office hysteroscopy: a randomized controlled trial [published online January 9, 2017]. Obstet Gynecol. doi: 10.1097/AOG.0000000000001842
  2. Finikiotis G. Side-effects and complications of outpatient hysteroscopy. Aust N Z J Obstet Gynaecol. 1993;33:61-62. doi: 10.1111/j.1479-828X.1993.tb02056.x
  3. Loffer FD. Complications of hysteroscopy—their cause, prevention, and correction. J Am Assoc Gynecol Laparosc. 1995;3:11-26. doi: 10.1016/S1074-3804(05)80132-X
  4. Ahmad G, O'Flynn H, Attarbashi S, Duffy JM, Watson A. Pain relief for outpatient hysteroscopy. Cochrane Database Syst Rev. 2010;11:CD007710. doi: 10.1002/14651858.CD007710.pub2
  5. Unfried G, Wieser F, Albrecht A, Kaider A, Nagele F. Flexible versus rigid endoscopes for outpatient hysteroscopy: a prospective randomized clinical trial. Hum Reprod. 2001;16:168-171. doi: 10.1093/humrep/16.1.168


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