Transcutaneous Electrical Nerve Stimulation to Reduce Pain With Medication Abortion: A Randomized Controlled Trial

High-frequency, high-intensity transcutaneous electrical nerve stimulation compared with opioids for pain relief after gynecological surgery: a systematic review and meta-analysis

OBJECTIVES

Opioids are important for postoperative analgesia but their use can be associated with numerous side effects. Transcutaneous electrical nerve stimulation (TENS) has been used for acute pain treatment and has dose-dependent analgesic effects, and therefore presents an alternative to intravenous (iv) opioids for postoperative pain relief. The aim of this meta-analysis was to compare high-frequency, high-intensity (HFHI or intense) TENS to iv opioids with regard to postoperative pain intensity, recovery time in the Post Anesthesia Care Unit (PACU) and opioid consumption after elective gynecological surgery.

METHODS

We searched Medline, Embase, Web of Science, Cochrane, Amed and Cinahl for RCTs and quasi-experimental studies (2010-2022), and WHO and ClinicalTrials.gov for ongoing/unpublished studies. Meta-analysis and subsequent Trial Sequential Analysis (TSA) was performed for all stated outcomes. Quality of evidence was assessed according to GRADE.

RESULTS

Only three RCTs met the inclusion criteria (362 participants). The surgical procedures involved surgical abortion, gynecologic laparoscopy and hysteroscopy. The applied TENS frequency was 80 Hz and intensity 40-60 mA. There was no difference in pain intensity according to Visual Analogue Scale (VAS) at discharge from PACU between the TENS and opioid group (MD VAS -0.15, 95 % CI -0.38 to 0.09) (moderate level of evidence). Time in PACU was significantly shorter in the TENS group (MD -15.2, 95 % -22.75 to -7.67), and this finding was manifested by TSA (high-level of evidence). Opioid consumption in PACU was lower in the TENS group (MD Morphine equivalents per patient mg -3.42, 95 % -4.67 to -2.17) (high-level of evidence).

CONCLUSIONS

There was no detectable difference in postoperative pain relief between HFHI TENS and iv opioids after gynecological surgery. Moreover, HFHI TENS decreases recovery time and opioid consumption in PACU. HFHI TENS may be considered an opioid-sparing alternative for postoperative pain relief after gynecological surgery.

SYSTEMATIC REVIEW REGISTRATION

PROSPERO CRD42021231048.

Spasmodic Dysphonia Patients' Perception of Pain with Botulinum Toxin Injections

OBJECTIVES

To evaluate spasmodic dysphonia patients' perception of pain associated with laryngeal botulinum toxin (BTX) injections and to determine factors associated with higher pain scores relative to other included patients.

METHODS

Prospective cohort study. Adult patients with adductor spasmodic dysphonia that presented to a tertiary laryngology practice for BTX injections were recruited from March to July 2022. Patients completed the visual analog scale (VAS) pre-procedure to quantify predicted pain. Ten minutes post-procedure they completed VAS and the short form McGill Pain Questionnaire (SF-MPQ). Factors that may affect pain were extracted from charts. Descriptive statistics, univariate, and multivariate analyses were conducted (alpha = 0.05).

RESULTS

One hundred and nineteen patients were included (63 ± 14 yo, 26% Male). SF-MPQ reported mild pain (4.12 ± 4.05 out of 45) with a pain intensity of none to mild (0.70 ± 0.89 out of 5). Bilateral injections yielded significantly higher SF-MPQ scores (5.19 ± 4.66) than unilateral injections (3.30 ± 3.30) (p = 0.012). There was a significant VAS reduction from pre 28.9 ± 24.6 mm (out of 10 mm) to post 24.5 ± 22.3 (p < 0.001). On multiple regression analyses, receiving a bilateral injection significantly (p < 0.05) contributed to a model that predicted higher pre-VAS (p = 0.013). Bilateral injections (p < 0.05) and higher VHI-10 (p < 0.05) contributed to a model that predicted higher total SF-MPQ (p = 0.001) and affective SF-MPQ (p = 0.001) scores. Not being a professional voice user (PVU) significantly (p < 0.05) contributed to a model that predicted higher post-VAS (p = 0.008) scores.

CONCLUSIONS

BTX injections were well tolerated with low pain scores. Factors associated with higher relative predicted or experienced pain included bilateral versus unilateral injection, PVU status, and higher VHI-10.

LEVEL OF EVIDENCE

4 Laryngoscope, 134:240-246, 2024.

Pain Management in Abortion Care

Both medication and procedural abortion are associated with pain. The experiences of pain depend on both physical and emotional factors. Several pain management options are available for abortion, depending on abortion type, clinical setting, and patient considerations, and a comprehensive approach is necessary to optimize pain management.

Effect of TENS on Vacuum Pain in Acute Soft Tissue Trauma

BACKROUND

In the literature, the effect of TENS on acute pain has been investigated, and no study has been found on its effect on pain associated with VAC application. This randomized controlled trial was designed to assess the efficacy of TENS application in pain caused by vacuum applied in acute soft tissue trauma of the lower extremity.

DESIGN AND SETTINGS

The study included 40 patients: 20 in the control group, and 20 in the experimental group and was carried out in a university hospital's plastic and reconstructive surgery clinic. Data for the study were gathered using the Patient Information form and the Pain Assessment form. Conventional TENS lasting 30 minutes was applied to the experimental group patients 1 hour before vacuum (vacuum assisted closure [VAC]) insertion and removal by the researcher, and TENS was not applied to the control group. The "Numerical Pain Scale" was used to assess pain in both groups before and after TENS application. In the statistical analysis of the data, the SPSS 23.0 package program was used. In all tests, p < .005 was considered statistically significant.

RESULTS

The experimental and control groups of the patients included in the study were homogeneous in terms of demographic characteristics (p > .05). Furthermore, when the pain levels of the groups were compared over time, it was discovered that the pain levels of the control group were significantly higher than the experimental group at the times of VAC insertion (T3) and VAC removal (T6) (p < .05). Bonferroni test, one of the post hoc tests, was used to determine in-group significance in both the experimental and control groups, and it was discovered that the difference was between T6 and all other times (T6-T1, T2, T3, T4, T5).

CONCLUSIONS

The results obtained from our study showed that TENS reduced the pain caused by vacuum applied in acute soft tissue trauma of the lower extremity. It is thought that TENS may not replace traditional analgesics but may help reduce the level of pain and contribute to healing by increasing comfort during painful procedures.

Improving experience of medical abortion at home in a changing therapeutic, technological and regulatory landscape: a realist review

OBJECTIVE

To inform UK service development to support medical abortion at home, appropriate for person and context.

DESIGN

Realist review SETTING/PARTICIPANTS: Peer-reviewed literature from 1 January 2000 to 9 December 2021, describing interventions or models of home abortion care. Participants included people seeking or having had an abortion.

INTERVENTIONS

Interventions and new models of abortion care relevant to the UK.

OUTCOME MEASURES

Causal explanations, in the form of context-mechanism-outcome configurations, to test and develop our realist programme theory.

RESULTS

We identified 12 401 abstracts, selecting 944 for full text assessment. Our final review included 50 papers. Medical abortion at home is safe, effective and acceptable to most, but clinical pathways and user experience are variable and a minority would not choose this method again. Having a choice of abortion location remains essential, as some people are unable to have a medical abortion at home. Choice of place of abortion (home or clinical setting) was influenced by service factors (appointment number, timing and wait-times), personal responsibilities (caring/work commitments), geography (travel time/distance), relationships (need for secrecy) and desire for awareness/involvement in the process. We found experiences could be improved by offering: an option for self-referral through a telemedicine consultation, realistic information on a range of experiences, opportunities to personalise the process, improved pain relief, and choice of when and how to discuss contraception.

CONCLUSIONS

Acknowledging the work done by patients when moving medical abortion care from clinic to home is important. Patients may benefit from support to: prepare a space, manage privacy and work/caring obligations, decide when/how to take medications, understand what is normal, assess experience and decide when and how to ask for help. The transition of this complex intervention when delivered outside healthcare environments could be supported by strategies that reduce surprise or anxiety, enabling preparation and a sense of control.

Pain management in outpatient surgical abortion

PURPOSE OF REVIEW

To review the current literature focusing on pain management and experiences during abortion care.

RECENT FINDINGS

Analgesic options in abortion care address pain associated with the procedure, osmotic dilator insertion, and cervical preparation. The paracervical block (PCB) is effective for pain control in first and second trimester abortions. Lower volume PCBs demonstrate non inferiority with osmotic dilator placement compared with higher volume PCBs with lower potential for toxicity. Self-administered vaginal lidocaine gel is noninferior to PCB in first trimester abortions. Preoperative oral narcotics and sedation do not reduce pain in first trimester abortions; however, the latter may reduce anxiety. For second trimester abortions, narcotics or gabapentin do not improve postoperative pain, yet up to half of patients will use narcotics if offered. Nonpharmacological methods have shown success in pain management. Music and doula support do not improve pain; however, patients would recommend these modalities, indicating some benefit that went unmeasured. Auricular acupuncture and transcutaneous electrical nerve stimulation (TENS) reduce pain and anxiety during first trimester abortions.

SUMMARY

Several modalities reduce pain during abortion care; however, pain alone does not reflect patient satisfaction. Development of multidimensional measures for pain control assessment has the potential to capture the patient's overall experience.

Transcutaneous Electrical Nerve Stimulation for Pain Management of Aspiration Abortion up to 83 Days of Gestation: A Randomized Controlled Trial

OBJECTIVE

To evaluate high-frequency, high-intensity transcutaneous electrical nerve stimulation (TENS) as an inexpensive, noninvasive pain management approach for first-trimester aspiration abortion.

METHODS

We conducted a noninferiority, single-blind, randomized controlled trial of patients seeking aspiration abortion at up to 83 days of gestation. Participants received TENS (placed posteriorly, T10-L1 and S2-S4) or intravenous (IV) sedation (fentanyl, midazolam). The primary outcome was pain with aspiration, as self-reported by visual analog scale (VAS, 100 mm). To detect at least a 15 mm mean difference on the 100 mm VAS with 90% power and a significance level of .05, a total of 90 participants were required.

RESULTS

Between January 2018 and October 2019, we enrolled 109 participants (55 TENS, 54 IV). Participant median gestation was 53 days (range 36-82) in the TENS group and 58 days (range 35-82) in the IV group (P=.65). Group demographics and clinical histories were similar. Intention-to-treat analysis (n=109) yielded noninferior results for the primary outcome (mean difference 4.8 mm, 95% CI -5.9 to 13.5 mm). In the per-protocol analysis, 9 (16%) in the TENS group were excluded after receiving IV sedation; 100 participants were included (46 TENS, 54 IV). Median (range) reported VAS for aspiration was 73 mm (13-97) and 66 mm (0-99) in the TENS and IV groups, respectively (P=.40). With a mean difference of 4.4 mm (95% CI -5.6 to 14.5 mm), we found TENS to be noninferior to IV. Physicians underestimated participant pain, perceiving pain to be 34 mm (6-91) in the TENS group and 25 mm (0-83) in the IV group (P=.003).

CONCLUSION

We found TENS to be a noninferior alternative to IV sedation for aspiration pain during first-trimester abortion. Expanding pain management options can improve quality of and access to abortion. Transcutaneous electrical nerve stimulation could be a standalone or adjunct approach for abortion pain management for those without access to or are ineligible to receive IV sedation due to the lack of sedation practitioner, designated driver, or local restrictions.

CLINICAL TRIAL REGISTRATION

ClinicalTrials.gov, NCT03187002.