Progressive Muscle Relaxation: A Breakthrough in Post-Surgery Pain Management for Kidney Donors

Progressive Muscle Relaxation Reduces Postoperative Pain and Anxiety in Living Kidney Donors: A Randomized Controlled Trial

A new randomized controlled trial has demonstrated that progressive muscle relaxation (PMR) exercises significantly reduce postoperative pain, anxiety, and analgesic requirements in living kidney donors undergoing laparoscopic nephrectomy. The study, conducted at a private hospital in Istanbul between January and September 2023, provides compelling evidence for incorporating non-pharmacological pain management approaches into standard postoperative care protocols for this unique patient population.

Living kidney donation represents a critical component of transplantation programs worldwide, particularly in countries like Türkiye where 91.3% of kidney transplants involve living donors. Despite advances in minimally invasive surgical techniques, these healthy volunteers still experience significant postoperative pain that can hamper recovery and potentially contribute to chronic pain development. Previous research has indicated that between 5.7% and 41% of donors may develop chronic pain following laparoscopic nephrectomy, highlighting the importance of effective perioperative pain management strategies. Living donors also face unique psychological challenges, including anxiety related to surgical risks and complex emotions surrounding organ donation, which can potentially amplify pain perception and complicate recovery.

How Was the Trial Designed?

This single-blind trial enrolled 62 participants who were randomly assigned to either receive PMR (n=31) or standard care (n=31). The intervention group received detailed instruction and video-assisted practice in progressive relaxation techniques the day before surgery, followed by guided relaxation sessions using audio recordings developed by the Turkish Psychologists Association during the postoperative period. These recordings included breathing techniques and progressive muscle relaxation exercises accompanied by soothing background music. The researchers employed multiple validated assessment tools, including the Visual Analog Scale (VAS) for pain measurement and the Spielberger State and Trait Anxiety Inventory (STAI) for anxiety assessment. The study also tracked analgesic consumption through patient-controlled analgesia (PCA) device usage, additional analgesic requirements, and recorded time to mobilization and oral intake initiation.

The results revealed significant differences in pain scores between the groups. While pre-intervention VAS measurements on postoperative day one were comparable between groups, scores measured fifteen minutes after the intervention were substantially lower in the PMR group (4.613) compared to the control group (7.387), representing a statistically significant difference (p<0.001). This pain-reducing effect persisted through postoperative day two, with the PMR group maintaining lower pain scores (2.710) compared to controls (3.774). The intervention also demonstrated remarkable efficacy in reducing state anxiety levels, with post-test anxiety scores significantly lower in the PMR group (41.258) compared to the control group (61.000). This substantial difference (p<0.001) underscores the potential psychological benefits of this non-pharmacological approach.

Perhaps most clinically relevant was the finding that patients in the PMR group required significantly fewer PCA bolus administrations compared to controls (7.516 vs. 18.774, p<0.001), representing a large effect size (Cohen's d=1.16). This substantial reduction in opioid requirements could have important implications for minimizing medication-related side effects and potentially supporting faster recovery. The study also found that patients receiving PMR were mobilized earlier than those in the control group, with 83.9% of the experimental group mobilized at the standard 8-hour mark compared to only 48.4% of controls. Interestingly, no significant difference was observed in the time to oral intake initiation between groups, possibly due to standardized hospital protocols for postoperative feeding.

What Do the Correlation Analyses Reveal?

Correlation analysis revealed significant positive relationships between pain levels and bolus requirements across all time points (r=0.682–0.763, p<0.01), as well as between post-test anxiety scores and postoperative pain measures. These findings support the interconnected nature of pain, anxiety, and analgesic requirements, suggesting that interventions targeting psychological factors may have cascading benefits for physical recovery parameters. The study's principal investigator noted that "while PMR doesn't directly relieve pain, it appears to reduce muscle tension, interrupt the pain cycle, and enhance patients' sense of control, potentially explaining the observed benefits."

The demographic characteristics of the study participants were well-balanced between groups, with no significant differences in terms of gender, age, education level, marital status, employment, religious affiliation, relationship to the recipient, chronic disease status, BMI, smoking and alcohol use, previous hospitalization, or surgical history. The mean age was 45.87 years in the experimental group and 43.52 in the control group. Most participants were male (64.5% in the experimental group, 58.1% in the control group), had high school education (51.6% and 54.8% respectively), were married (64.5% and 71%), and had no history of chronic pain (93.5% in both groups). The most common donor-recipient relationship was between partners (35.5% in the experimental group) and parent-to-child donation (29% in the control group).

What Are the Study's Limitations?

The researchers acknowledge several limitations to their work, including the single-center design limiting generalizability, lack of assessor blinding that may have introduced bias given the subjective nature of pain assessment, and potential confounding from the additional attention received by the intervention group. Additionally, the study was conducted during the post-COVID-19 period, which may have influenced hospital protocols and patient anxiety levels in ways that affect the applicability of findings to other timeframes. Despite these limitations, the robust effect sizes observed across multiple outcome measures support the clinical significance of the findings.

Based on these results, the researchers recommend that PMR exercises be routinely incorporated into postoperative care protocols for living kidney donors. They suggest that implementation of this non-pharmacological approach could enhance donor recovery experiences while potentially reducing opioid-related side effects and complications. The study team calls for future research incorporating multicenter designs, extended follow-up periods to evaluate effects on chronic pain development, and more objective pain assessment measures to further strengthen the evidence base for clinical practice guidelines.

Could These Findings Reshape Postoperative Care?

This study contributes valuable evidence to the growing body of literature supporting integrated pain management approaches that combine pharmacological and non-pharmacological strategies. For transplant centers and clinicians working with living donors, these findings offer a practical, low-cost intervention that could meaningfully improve the donation experience. Could wider implementation of PMR and similar mind-body techniques fundamentally change how we approach postoperative care for not only living donors but surgical patients more broadly? How might transplant centers best integrate these approaches into existing care protocols to optimize outcomes while maintaining workflow efficiency? As healthcare continues to evolve toward more patient-centered approaches, studies like this one highlight the potential value of addressing both the physical and psychological dimensions of the surgical experience.

Summary

A recent randomized controlled trial in Istanbul examined the effects of progressive muscle relaxation (PMR) on 62 living kidney donors undergoing laparoscopic nephrectomy. The study found that patients who received PMR training showed significantly lower pain scores (4.613 vs 7.387) and anxiety levels (41.258 vs 61.000) compared to the control group. PMR patients required fewer pain medication doses and achieved earlier mobilization, with 83.9% mobile at the 8-hour mark versus 48.4% in controls. The research demonstrates strong correlations between pain levels, anxiety scores, and analgesic requirements, suggesting PMR's potential as an effective non-pharmacological intervention in postoperative care. Despite some limitations, including single-center design and potential bias, the results strongly support incorporating PMR into standard postoperative protocols for living kidney donors.