Surgical aspects of chronic post-thoracotomy pain

Abdominal Flank Bulging after Lateral Retroperitoneal Approach: A Case Report

The lateral transpsoas approach to access the vertebrae obviates the need for an approach surgeon and minimizes muscular disruption, thus allowing for quicker recovery. Several reports on the lateral transpsoas procedure have described few complications. However, the development of an unsightly and painful abdominal flank bulge is a largely under-recognized and very rare complication of the lateral transpsoas approach. A 59-year-old man suffered from back pain and bilateral posterior leg pain. Computed tomography (CT) scan and MRI showed retrolisthesis at L3–4, L2 wedge vertebrae with kyphosis, left L4 screw loosening, and L3–4 disc herniation with central canal stenosis. L2 corpectomy and L3–4 DLIF and posterior fusion to T12 for kyphosis correction were performed. For the lateral approach, resection of the T11 rib was performed. One month later, he developed left abdominal flank bulging below the lateral approach site, which was aggravated by walking, coughing, defecating, constipation, and eating. CT scan showed left abdominal flank bulging accompanied by abdominal muscle thinning. We believe that this complication is caused by denervation of the abdominal musculature after injury to the T11 intercostal nerves.

The Effect of Pregabalin and Methylcobalamin Combination on the Chronic Postthoracotomy Pain Syndrome

BACKGROUND

Chronic postthoracotomy pain (CPTP) consists of different types of pain. Some characteristics of CPTP are the same as those of recognized neuropathic pain syndromes. We aimed to determine the safety and efficacy of pregabalin and methylcobalamin combination (PG-B₁₂) in comparison with diclofenac potassium (DP) in patients with CPTP.

METHODS

One hundred consecutive patients with CPTP after posterolateral/lateral thoracotomy were prospectively randomly assigned and evaluated. Fifty patients were given PG-B₁₂ and another 50 patients were given DP treatment. Visual Analogue Scale (VAS) and the Leeds Assessment of Neuropathic Symptoms and Signs (LANSS) scorings were performed previous to the treatment (day 0) and on the 15th, 30th, 60th, and 90th days. Adverse events were questioned.

RESULTS

The mean ages were 58.7 ± 12.2 and 54.6 ± 14.5 years, and the mean durations of pain were 4.01 ± 1.04 and 3.8 ± 1.02 months, respectively. The number of patients with a VAS score less than 5 at the latest follow-up (VAS90 < 5) was 44 (88%) and 18 (36%) in the PG-B₁₂ and DP groups, respectively (p < 0.05). Forty-four patients (88%) in the PG-B₁₂ group and 16 patients (32%) in the DP group had a LANSS score less than 12 at the latest follow-up (p < 0.05). Minor adverse events that did not mandate discontinuation of the treatment were observed in 14 patients (28%) in the PG-B₁₂ group and 2 patients (4%) in the DP group.

CONCLUSIONS

PB-B₁₂ is safe and effective in the treatment of CPTP with minimal side effects and a high patient compliance. These results should be supported by multidisciplinary studies with larger sample sizes and longer follow-ups.

Asian perspectives in thoracic surgery: clinical innovation in Taiwan

The development of minimally-invasive surgery of the thorax began in the 1990s, but not until the recent decade did we see dramatic improvements in patient care and refinement of technique. The current generation has witnessed the evolution from traditional thoracotomy, to a single-port, non-intubated thoracoscopic approach. The investigation of subxiphoid single-port, transumbilical approach, and natural orifice transluminal endoscopic surgery (NOTES) in animal model are also undergoing. In Taiwan, several talented young surgeons have vigorously devoted their ideas and innovations to this field, making the Taiwan surgical society vivid and prosperous. The desire to improve, and willingness to change are the foundation of those surgeons. Providing better patient care is their impetus to strive for improvement. This article provides an account of how minimally-invasive thoracic surgery has evolved in recent years, and what clinical innovations have been developed by the Taiwan surgical society.

Subxiphoid single-port video-assisted thoracoscopic surgery

Background

We report the feasibility and safety of chest surgery through the subxiphoid single port approach based on our preliminary experience.

Methods

From December 2013 till January 2016, 39 patients underwent 40 thoracoscopic surgeries via a 3- to 4-cm subxiphoid single incision. A sternal lifter was applied for better entrance and working angle. A zero-degree deflectable scope was preferred. The technique for anatomic resection was similar to that in the traditional single-port approach. Patient characteristics and demographic data were analyzed.

Results

There were 29 females and 10 males, with a median age of 56 years. Indication for surgery included 24 patients with primary lung cancer, eight with lung metastases, two with benign lung lesions, one with bilateral pneumothorax, and five with mediastinal tumors. Surgeries included lobectomy in 21, segmentectomy in five, wedge resection in nine, and mediastinal surgery in five patients. There was no surgical mortality. Complications (10%, 4 in 40) included postoperative bleeding in one patient, chylothorax in one patient, and transient arrhythmia in the early learning curve in two patients.

Conclusions

Our results indicated that subxiphoid single-incision thoracoscopic pulmonary resection could be performed safely but under careful patient selection with modification of instruments. Moreover, having a previous single-port incision experience was crucial. Major limitations of this approach included more frequently encountered instrument fighting; interference of left-side procedure related to heartbeat and radical mediastinal lymph node (LN) dissection; and the ability to handle complex conditions, such as anthracotic LNs, diffuse adhesion, and major bleeding.

The Effect of Pre-Emptive Dexmedetomidine on the Incidence of Post-Thoracotomy Pain Syndrome in Patients Undergoing Coronary Artery Bypass Grafting

Background

Post-thoracotomy pain syndrome (PTPS) is pain that recurs or persists along a thoracotomy incision for at least two months following surgery. Dexmedetomidine (dex) is an α-2 agonist that also has analgesic, sedative-hypnotic, and sympatholytic properties.

Objectives

To determine the effect of pre-emptive dexmedetomidine on the incidence of PTPS in patients undergoing coronary artery bypass grafting (CABG).

Patients and Methods

This randomized clinical trial enrolled 104 candidates for elective coronary artery bypass grafting (CABG) and randomly assigned them to either a dex group or a control group. In the dex group, dexmedetomidine 0.5 µg/kg/hour was infused from the initiation of anesthesia until postoperative extubation in the intensive-care unit. Two months after surgery, the patients were contacted by telephone and interviewed to determine the presence of pain at the thoracotomy scars.

Results

Fifty-four patients were placed in the control group, and 50 patients were assigned to the dex group. The age, sex, and body mass index were not significantly different between the two groups of study (P > 0.05). The incidence of PTPS was 11/50 (22%) patients in the dex group and 28/54 patients (52%) in the control group. A chi-square test revealed a significant difference in the incidence of PTPS after two months between the dex and control groups (P = 0.032).

Conclusions

PTPS is a common problem following CABG, and pre-emptive therapy with dex may decrease neuropathic pain.

Thoracoscopic surgery via a single-incision subxiphoid approach is associated with less postoperative pain than single-incision transthoracic or three-incision transthoracic approaches for spontaneous pneumothorax

BACKGROUND

Comparison of the degree of postoperative pain associated with different thoracoscopic surgical techniques for spontaneous pneumothorax has never reported. In this study we compared perioperative outcomes and degrees of postoperative pain associated with single-incision subxiphoid thoracoscopic surgery, single-incision transthoracic thoracoscopic surgery and three-incision transthoracic thoracoscopic surgery for spontaneous pneumothorax.

METHODS

During the period August 2013 to September 2015, fifty-seven consecutive patients with spontaneous pneumothorax were treated via single-incision subxiphoid thoracoscopic surgery, single-incision transthoracic thoracoscopic surgery or three-incision transthoracic thoracoscopic surgery. Demographic data, operative time, operative blood loss, length of hospital stay, duration of chest tube drainage, postoperative complications, and numeric pain rating scale scores were collected from the medical records for analysis.

RESULTS

Among the 57 patients, 14 received single-incision subxiphoid thoracoscopic surgery, 26 underwent single-incision transthoracic surgery and 17 received three-incision thoracoscopic surgery. In all patients, surgeries were completed without the need for conversion to open surgery. Patients who underwent the single-incision subxiphoid procedure had significantly lower 1-, 8-, 24- and 32-hour postoperative pain scale scores than patients who underwent the other two procedures. The average and maximum pain scale scores during the first 24 hours were lowest in the single-incision subxiphoid group (P<0.0001).

CONCLUSIONS

Single-incision subxiphoid thoracoscopic surgery is associated with significantly lower postoperative pain intensity than transthoracic approaches and therefore may provide an alternative surgical technique for patients with spontaneous pneumothorax.

Subxiphoid uniportal video-assisted thoracoscopic surgery (VATS) for lobectomy: a report of 105 cases

BACKGROUND

To address the feasibility and advantages of subxiphoid uniportal video-assisted thoracoscopic surgery (VATS) for lobectomy.

METHODS

Since August 2014, 105 cases of subxiphoid uniportal VATS lobectomy were successfully performed. The clinical information was retrospectively analyzed.

RESULTS

96 cases underwent unilateral operation and 9 underwent bilateral operations. Surgeries were successfully performed with a complication rate of 10.5%. The average pain scores 8 hours, day 1, 2 and 3 after surgery, as well as the day before discharge were 2.39±0.99, 2.06±0.85, 1.68±0.87, 1.29±0.78, and 0.48±0.51, respectively, which were significantly lower than those in the control group (standard intercostal uniportal VATS) (P<0.001).

CONCLUSIONS

The subxiphoid uniportal VATS lobectomy is safe and reliable, which is appropriate for bilateral lung diseases, and significantly relieves postoperative incision pain.

Paravertebral block versus thoracic epidural for patients undergoing thoracotomy

BACKGROUND

Operations on structures in the chest (usually the lungs) involve cutting between the ribs (thoracotomy). Severe post-thoracotomy pain can result from pleural (lung lining) and muscular damage, costovertebral joint (ribcage) disruption and intercostal nerve (nerves that run along the ribs) damage during surgery. Poor pain relief after surgery can impede recovery and increase the risks of developing complications such as lung collapse, chest infections and blood clots due to ineffective breathing and clearing of secretions. Effective management of acute pain following thoracotomy may prevent these complications and reduce the likelihood of developing chronic pain. A multi-modal approach to analgesia is widely employed by thoracic anaesthetists using a combination of regional anaesthetic blockade and systemic analgesia, with both non-opioid and opioid medications and local anaesthesia blockade.There is some evidence that blocking the nerves as they emerge from the spinal column (paravertebral block, PVB) may be associated with a lower risk of major complications in thoracic surgery but the majority of thoracic anaesthetists still prefer to use a thoracic epidural blockade (TEB) as analgesia for their patients undergoing thoracotomy. In order to bring about a change in practice, anaesthetists need a review that evaluates the risk of all major complications associated with thoracic epidural and paravertebral block in thoracotomy.

OBJECTIVES

To compare the two regional techniques of TEB and PVB in adults undergoing elective thoracotomy with respect to:1. analgesic efficacy;2. the incidence of major complications (including mortality);3. the incidence of minor complications;4. length of hospital stay;5. cost effectiveness.

SEARCH METHODS

We searched for studies in the Cochrane Central Register of Controlled Trials (CENTRAL 2013, Issue 9); MEDLINE via Ovid (1966 to 16 October 2013); EMBASE via Ovid (1980 to 16 October 2013); CINAHL via EBSCO host (1982 to 16 October 2013); and reference lists of retrieved studies. We handsearched the Journal of Cardiothoracic Surgery and Journal of Cardiothoracic and Vascular Anesthesia (16 October 2013). We reran the search on 31st January 2015. We found one additional study which is awaiting classification and will be addressed when we update the review.

SELECTION CRITERIA

We included all randomized controlled trials (RCTs) comparing PVB with TEB in thoracotomy, including upper gastrointestinal surgery.

DATA COLLECTION AND ANALYSIS

We used standard methodological procedures expected by Cochrane. Two review authors (JY and SG) independently assessed the studies for inclusion and then extracted data as eligible for inclusion in qualitative and quantitative synthesis (meta-analysis).

MAIN RESULTS

We included 14 studies with a total of 698 participants undergoing thoracotomy. There are two studies awaiting classification. The studies demonstrated high heterogeneity in insertion and use of both regional techniques, reflecting real-world differences in the anaesthesia techniques. Overall, the included studies have a moderate to high potential for bias, lacking details of randomization, group allocation concealment or arrangements to blind participants or outcome assessors. There was low to very low-quality evidence that showed no significant difference in 30-day mortality (2 studies, 125 participants. risk ratio (RR) 1.28, 95% confidence interval (CI) 0.39 to 4.23, P value = 0.68) and major complications (cardiovascular: 2 studies, 114 participants. Hypotension RR 0.30, 95% CI 0.01 to 6.62, P value = 0.45; arrhythmias RR 0.36, 95% CI 0.04 to 3.29, P value = 0.36, myocardial infarction RR 3.19, 95% CI 0.13, 76.42, P value = 0.47); respiratory: 5 studies, 280 participants. RR 0.62, 95% CI 0.26 to 1.52, P value = 0.30). There was moderate-quality evidence that showed comparable analgesic efficacy across all time points both at rest and after coughing or physiotherapy (14 studies, 698 participants). There was moderate-quality evidence that showed PVB had a better minor complication profile than TEB including hypotension (8 studies, 445 participants. RR 0.16, 95% CI 0.07 to 0.38, P value < 0.0001), nausea and vomiting (6 studies, 345 participants. RR 0.48, 95% CI 0.30 to 0.75, P value = 0.001), pruritis (5 studies, 249 participants. RR 0.29, 95% CI 0.14 to 0.59, P value = 0.0005) and urinary retention (5 studies, 258 participants. RR 0.22, 95% CI 0.11 to 0.46, P value < 0.0001). There was insufficient data in chronic pain (six or 12 months). There was no difference found in and length of hospital stay (3 studies, 124 participants). We found no studies that reported costs.

AUTHORS' CONCLUSIONS

Paravertebral blockade reduced the risks of developing minor complications compared to thoracic epidural blockade. Paravertebral blockade was as effective as thoracic epidural blockade in controlling acute pain. There was a lack of evidence in other outcomes. There was no difference in 30-day mortality, major complications, or length of hospital stay. There was insufficient data on chronic pain and costs. Results from this review should be interpreted with caution due to the heterogeneity of the included studies and the lack of reliable evidence. Future studies in this area need well-conducted, adequately-powered RCTs that focus not only on acute pain but also on major complications, chronic pain, length of stay and costs.

Silencing of Id2 Alleviates Chronic Neuropathic Pain Following Chronic Constriction Injury

Inhibitor of DNA binding/differentiation 2 (Id2) belongs to a helix-loop-helix family of proteins. Recent studies have showed that Id2 plays a pivotal role in neuronal survival and neuroprotection. However, under neuropathic pain conditions, the role of Id2 is still unclear. In this study, we investigated the effect of Id2 on neuropathic pain in a rat chronic constriction injury (CCI) model. Our results demonstrated that Id2 was upregulated in the dorsal root ganglion (DRG) in a CCI rat in a time-dependent manner. Intrathecal short-hairpin RNA (shRNA)-Id2 attenuates mechanical allodynia and thermal hyperalgesia in CCI rats, and inhibits the expression of TNF-α and IL-1β in the DRG in CCI rats. Furthermore, knockdown of Id2 reduces the expression of NF-κB p65 in the DRG of CCI rats. Taken together, our findings suggest that knockdown of Id2 may alleviate neuropathic pain by inhibiting the NF-κB activation to inhibit the production of pro-inflammatory mediators. Therefore, Id2 may provide an important target of neuropathic pain treatment.

Double edge closure: a novel technique for reducing post-thoracotomy pain. A randomized control study

OBJECTIVES

Thoracic surgeons being doctors, spend much effort not only to manage pathologies but also to make their procedures painless. Many surgical manoeuvres have been evolved to reduce post-thoracotomy pain with its associated morbidities. This trial aimed to study the impact of double edge closure technique on post-thoracotomy pain.

METHODS

This was a prospective pre-muted block randomized study of 120 patients who had posterolateral thoracotomy. They were equally divided into two groups, the first in which double edge closure technique was used (DE group), and the other group in which the usual pericostal sutures were used (PC group). Outcomes assessed were operative time, time to ambulation, doses of analgesics injected in the epidural catheter, postoperative complications, chest tube drainage, hospital stay and pain score by the numeric rating scale from 0 to 10 and use of analgesics during the first postoperative year.

RESULTS

Both groups had similar demographics, types of procedures, operative time and incisions length. Patients in DE group had significantly lower time to ambulation from 14.47 to 12.85 h, epidural doses from 3.65 to 1.87 and postoperative pain score throughout the first week. At 2 weeks, 1 and 3 months, there was significant reduction in pain and analgesics use in the DE group. At 6 months, analgesic use was not significantly different between both groups, but the pain score was significantly lower in the DE group (0.33 ± 0.51) than that in the PC group (0.63 ± 0.74). After 9 months, no significant difference was present between both groups with regard to pain score or the use of analgesics.

CONCLUSIONS

Double edge technique for thoracotomy closure is easy, rapid, safe and effective in decreasing post-thoracotomy pain with subsequent earlier ambulation and lesser use of analgesics.

[Rib cage ostheosynthesis. Literature review and case reports]

BACKGROUND

Fractures of the chest wall include sternum and rib fractures. Traditionally they are managed conservatively due to the anatomy of the rib cage that allows most of them to remain stable and to form a callus that unites the fractured segments. In spite of this management, some patients present with chronic pain or instability of the wall which makes them require some type of fixation. The present article performs a literature review based on 4 cases.

CLINICAL CASES

The first case was a 61 year-old man with blunt chest trauma, with a great deformity of the chest wall associated with subcutaneous emphysema, and pneumothorax. The second case was a 51 year-old man with blunt chest trauma, initially managed at another institution, who despite treatment, had persistent pain and dyspnoea. The third case was a 30 year-old man that suffered a motor vehicle accident, with resulting pain and crepitation of the rib cage and with diagnostic images showing multiple rib fractures. The last case is a 62 year-old man that fell down the stairs, with blunt chest trauma with high intensity pain, dyspnoea and basal ipsilateral hypoventilation.

CONCLUSION

Rib fracture fixation offers a good alternative in selected patients to decrease associated morbidity, leading to a patient's fast return to his or her working life.

Trajectories of Symptom Occurrence and Severity From Before Through Five Months After Lung Cancer Surgery

CONTEXT

Limited information is available about lung cancer patients' symptoms in the pre- and postoperative periods.

OBJECTIVES

Study purposes were to evaluate for changes in symptom occurrence and severity from the preoperative period to five months after surgery and to evaluate for predictors of the occurrence and trajectories of these symptoms.

METHODS

Patients completed the Memorial Symptom Assessment Scale before and at one and five months after surgery. Changes in the six most common physical symptoms and the most common psychological symptom were evaluated using multilevel growth mixture modeling. Age, gender, comorbidity, and receipt of adjuvant chemotherapy were included as covariates in the conditional models for symptom occurrence and severity.

RESULTS

The total number of symptoms increased significantly from the preoperative to the one month assessment. At five months, the number of symptoms was lower than at one month but significantly higher than at the preoperative assessment. The occurrence of five of the symptoms (i.e., pain, lack of energy, shortness of breath, feeling drowsy, and worrying) increased significantly from before through the first month after surgery and then decreased over time. Cough and difficulty sleeping persisted over the five months of the study. In general, the effect of the four covariates was to increase patients' overall symptom burden.

CONCLUSION

Changes in the occurrence and severity of these seven symptoms were variable. All seven symptoms occurred at relatively high rates and were of moderate severity. Findings can be used to identify patients who are at higher risk for more severe symptoms.

Effect of Postoperative Administration of Pregabalin for Post-thoracotomy Pain: A Randomized Study

OBJECTIVE

The present study was performed to evaluate the effect of postoperative administration of pregabalin in patients who reported moderate-to-severe pain after epidural analgesia following thoracotomy.

DESIGN

An open-label, randomized, controlled, parallel-group study.

SETTING

A single center in Japan.

PARTICIPANTS

Consecutive patients (aged≥20 years) who reported moderate-to-severe pain after effectual 2-day epidural analgesia post-thoracotomy for lung cancer from February 2012 to March 2013.

INTERVENTIONS

Patients were assigned to 2 groups: control (control treatment: acetaminophen, 400 mg, and codeine phosphate powder, 20 mg) or pregabalin (pregabalin, 75 mg, plus control treatment). The 12-week study period included 2-week study treatment and 10-week follow-up.

MEASUREMENTS AND MAIN RESULTS

For efficacy, the primary endpoint was the visual analog scale (VAS) scores for pain at rest and with coughing at week 2, and secondary endpoints were the VAS scores for pain and the neuropathic pain questionnaire at week 12. Fifty patients were randomized (25 per group). At week 2, the VAS scores for pain at rest (mean [SD]) were 29.5 (21.9) in the control group and 16.3 (15) in the pregabalin group (p = 0.02); for pain with coughing, the scores were 45.2 (20.9) and 28.8 (25.9), respectively (p = 0.02). VAS scores improved more in the pregabalin group than in the control group over the 12 weeks. Patients free from possible neuropathic pain were 48% of the control group and 88% of the pregabalin group, respectively (p = 0.001).

CONCLUSIONS

Postoperative administration of pregabalin effectively reduced post-thoracotomy pain.

Primary pneumothorax: Should surgery be offered after the first episode?

Surgery is the recommended and most effective means of preventing the recurrence of primary spontaneous pneumothorax (PSP). However, the conventional belief amongst most clinicians is that surgery should not be routinely offered to patients with an uncomplicated first episode of PSP. The view that surgery should be reserved for recurrent episodes of ipsilateral PSP is based on an apprehension regarding traumatic thoracic surgery combined with a perception that recurrences after a single episode of PSP are unlikely. Modern advances in minimally invasive thoracic surgery have now dramatically reduced the morbidity of PSP surgery. Such surgery is now safe, effective and causes minimal indisposition for patients. On the other hand, modern clinical data suggests that recurrence rate of PSP is perhaps much higher than previously assumed, with more than half of patients experiencing a second episode within several years of the first. With such new appreciations of the current situation, it is appropriate to now consider offering surgery to patients even after the first episode of PSP.

Factors affecting postoperative respiratory tract function in type-C esophageal atresia. Thoracoscopic versus open repair

AIM

We assessed the outcome of 72 cases of type-C esophageal atresia (EAc) treated by open (OR) or thoracoscopic (TR) repair from 2000 to 2013. During OR, direct lung retraction (DLR) is required but during TR, CO2 insufflation causes lung collapse so DLR is unnecessary.

METHODS

Patient demographics, operative time, respiratory tract impact (RTI: incidence of atelectasis, timing of extubation, need for reintubation, and duration of chest tube insertion), narcotic usage, commencement of oral feeding, and length of hospitalization (LOH) were compared.

RESULTS

Seven long-gap cases were excluded, leaving 65 EAc subjects (TR = 25, OR = 40). Patient demographics, operative time, and duration of chest tube insertion were similar. No TR case required DLR. Significant differences were found in TR for narcotic usage (1.6 vs. 3.1 days), commencement of feeding (7.8 vs. 10.5 days), incidence of atelectasis (8 vs. 30 %), initial extubation (2.8 vs. 5.6 days), and LOH (33 vs. 46 days), (all p < 0.05, respectively). Postoperative tracheal tube blockage caused by excessive secretions (4 vs. 10 %) and reintubation (4 vs. 17.5 %) were less in TR but not significant. There were three anastomotic leakages in TR, one in OR.

CONCLUSION

TR is less traumatic than OR because DLR is unnecessary, resulting in lower RTI and smooth recovery.

Intraoperative chest tube removal following thoracoscopic lung biopsy results in improved outcomes

BACKGROUND

Traditionally, chest tubes are left following video assisted thoracoscopic surgery (VATS) to treat a potential air leak or significant drainage. Recognizing the potential complications, our aim was to determine if intraoperative chest tube removal in children undergoing VATS lung biopsy is safe and if outcomes differ from when a chest tube is left in place.

METHODS

We identified all children who underwent VATS lung biopsies from 2009 to 2013 and performed a retrospective review of the medical records. Pulmonary resection patients were excluded as were those with an air leak present in the operating room.

RESULTS

A total of 90 VATS lung biopsies were performed. 41 children had a postoperative chest tube left in place (Group A), and 49 children had it removed intraoperatively (Group B). Mean age was 9 ± 6.4 years. One child in Group A and 2 children in Group B required replacement of a chest tube (p=NS). Group B patients had a lower postoperative pain score on day one, fewer postoperative chest X-rays, and a shorter length of postoperative stay.

CONCLUSIONS

These data suggest that intraoperative chest tube removal is safe and may be associated with improved outcomes following lung biopsy in children.

Epigenetics of chronic pain after thoracic surgery

PURPOSE OF REVIEW

Chronic pain after surgery is a major public health problem and a major concern for perioperative physicians. Thoracic surgery presents a unique challenge, as thoracotomy is among the highest risk surgeries to develop persistent postsurgical pain. The purpose of this review is to discuss the relevance of research in pain epigenetics to patients with persistent pain after thoracic surgery.

RECENT FINDINGS

Recent advances have linked chronic pain states to genetic and epigenetic changes. Progress in our understanding of chronic pain has highlighted the importance of immune modulation of pain. It is possible that epigenetic changes driving chronic pain occur in the perioperative setting via histone modification and DNA methylation.

SUMMARY

The transition from acute to chronic pain after thoracic surgery may be mediated by epigenetics. Here, we discuss epigenetic modifications that have been discovered in animal models of chronic pain that may predispose patients to persistent neuropathic pain after thoracic surgery.

Introduction to neuropathic pain syndromes

Chronic pain impairs the quality of life for millions of individuals and therefore presents a serious ongoing challenge to clinicians and researchers. Debilitating chronic pain syndromes cost the US economy more than $600 billion per year. This article provides an overview of the epidemiology, clinical presentation, and treatment outcomes for craniofacial, spinal, and peripheral neurologic pain syndromes. Although the authors recognize that the diagnosis and treatment of the chronic forms of neuropathic pain syndromes represent a clinical challenge, there is an urgent need for standardized classification systems, improved epidemiologic data, and reliable treatment outcomes data.

Intercostal muscle flap and intracostal suture to reduce post-thoracotomy pain

BACKGROUND

Thoracotomy is considered to be the most painful surgical access, the main culprit being intercostal nerve injury. Despite the use of many techniques, this remains a major problem, pointing towards prevention as a better strategy. The effect of protecting both the upper and lower intercostal nerves during surgery has attracted many researchers.

METHOD

A prospective study spanning 15 months was undertaken in 48 patients randomized to a conventional group (n = 25) and a study group (n = 23). Pericostal sutures in the former and intracostal sutures in the latter were used for closure. An intercostal muscle flap was harvested at the start of the operation in the study group only. The groups were comparable in terms of baseline characteristics. With a similar pain protocol, pain scores and analgesic consumption were recorded and analyzed.

RESULTS

Times for pedicle harvest, intracostal suture, and pericostal suture were 5.2 ± 1.56, 3.65 ± 0.71, and 6.4 ± 1.20 min, respectively, in the study group. Total operative time was similar in both groups. Postoperative pain scores and the overall frequency of pain were consistently lower in the study group.

CONCLUSION

these techniques lead to a reduction in the acute and chronic post-thoracotomy pain, without increasing complications.

The role of corneal innervation in LASIK-induced neuropathic dry eye

Almost half the patients who undergo laser in situ keratomileusis (LASIK) experience dry eye following the procedure. However, the etiology of LASIK-induced dry eye is unclear. The purpose of this review is to examine and summarize the current evidence for the etiology of LASIK-induced dry eye, with a focus on ocular surface sensitivity and corneal innervation. Evidence suggests that the alteration of corneal nerves after LASIK is the most likely cause of the subjective symptoms of LASIK-induced dry eye, even though corneal sensitivity and the clinical indicators of dry eye return to apparently normal values within a year due to the partial recovery of the corneal nerve plexus. The hypothesis is explored that dry eye symptoms following LASIK may result from abnormal sensation due to LASIK-induced corneal neuropathy. Other factors, such as alterations in conjunctival goblet cell density, might also contribute to the symptoms and signs of LASIK-induced dry eye. Inter-relationships between nerve morphology, tear neuropeptide levels and dry eye require further investigation. A better understanding of this phenomenon may result in improved management of post-LASIK dry eye.

Lidocaine 5 % patches as an effective short-term co-analgesic in cancer pain. Preliminary results

PURPOSE

To analyze the short-term efficacy and patients' subjective perception of the use of lidocaine 5 % patches for painful scars (post-thoracotomy and post-mastectomy) and pain caused by chest wall tumors.

METHODS

This is a prospective, descriptive, non-controlled, non-randomized, open-label study of patients seen in the palliative care outpatient clinic. Demographic data, variables relating to the severity of the pain, and concomitant therapy both at the start and end of treatment, the need for interventional anesthetic techniques (IAT), patients' subjective perception and treatment-related side effects were all recorded.

RESULTS

Twenty patients were included with a mean follow-up of 29.2 days. The treatment led to a statistically significant clinical improvement in pain severity. There was no clinically significant opioid dose escalation during the treatment period. Only three patients required IAT to relieve the pain. Sixty five percent of patients were very satisfied with the therapy. No systemic or local adverse events were reported.

CONCLUSIONS

The addition of lidocaine 5 % patches is effective in the short term for the treatment of neuropathic cancer pain accompanied by allodynia, whether deriving from a painful scar or chest wall tumor. These findings need to be confirmed by randomized controlled trials with larger samples.

Impairment-driven cancer rehabilitation: an essential component of quality care and survivorship

Adult cancer survivors suffer an extremely diverse and complex set of impairments, affecting virtually every organ system. Both physical and psychological impairments may contribute to a decreased health-related quality of life and should be identified throughout the care continuum. Recent evidence suggests that more cancer survivors have a reduced health-related quality of life as a result of physical impairments than due to psychological ones. Research has also demonstrated that the majority of cancer survivors will have significant impairments and that these often go undetected and/or untreated, and consequently may result in disability. Furthermore, physical disability is a leading cause of distress in this population. The scientific literature has shown that rehabilitation improves pain, function, and quality of life in cancer survivors. In fact, rehabilitation efforts can ameliorate physical (including cognitive) impairments at every stage along the course of treatment. This includes prehabilitation before cancer treatment commences and multimodal interdisciplinary rehabilitation during and after acute cancer treatment. Rehabilitation appears to be cost-effective and may reduce both direct and indirect health care costs, thereby reducing the enormous financial burden of cancer. Therefore, it is critical that survivors are screened for both psychological and physical impairments and then referred appropriately to trained rehabilitation health care professionals. This review suggests an impairment-driven cancer rehabilitation model that includes screening and treating impairments all along the care continuum in order to minimize disability and maximize quality of life.

Pregabalin in Chronic Post-thoracotomy Pain

INTRODUCTION

Chronic post-thoracotomy pain (CPP) has very high incidence and therefore it needs attention. Usually, it is burning, dysaesthetic and aching in nature and it displays many features of neuropathic pain. No one technique of thoracotomy has been shown to reduce the incidence of chronic post thoracotomy pain.

OBJECTIVES

To evaluate the efficacy and safety of pregabalin in patients with chronic post-thoracotomy pain.

METHODS

This prospective, randomized study was conducted on 50 consenting patients who underwent posterolateral thoracotomy. 25 patients were given pregabalin for 21 days (Group A). Another 25 were given diclofenac sodium (Group B) on demand and they escaped treatment. Visual Analogue Scale (VAS) scoring was performed on days 0, 1 and 7, then follow up was done at 3, 6, 12 and 24 weeks. The data was analyzed by using t-test and Chi- square test for various variables.

RESULTS

The pain VAS scores in Group A were significantly low at all observation points except on day 0, day 1 and day 7 post-operatively, when the difference in pain scores in both the groups were comparable. The overall pain scores of Group A were comparable at day 0, day 1 and at day 7 as compared to those of Group B (p>0.9). Pain was significantly low at three weeks (p<0.05). Pain scores of Group A were significantly low at 6 weeks,12 weeks and 24 weeks as compared to those of Group B (p<0.001) and the difference was statistically significant. No significant adverse reactions were observed during study period.

CONCLUSION

Pregabalin is a safe and an effective adjuvant which is used for reducing the chronic post thoracotomy pain, which has no side effects and a high patient compliance. These results should be supported with multidisciplinary studies with larger sample sizes and longer follow-ups.

Multidisciplinary Approach to Lifesaving Measures in the Elderly Individuals With Flail Chest Injury With ORIF of Rib Fractures: A Report of 2 Cases

In this case report, we present 2 cases of flail chest in geriatric patients after severe blunt chest trauma, which were treated at the University Hospital Innsbruck (Level I Trauma Center and Tyrolean Geriatric Fracture Center) by a multidisciplinary team of physicians from anesthesia, intensive care, trauma surgery, and acute geriatrics. We want to point out the benefit of a multidisciplinary approach in geriatric patients with flail chest.

Post-thoracotomy pain syndrome: assessment and intervention

Surgery is a cornerstone of treatment in early-stage non-small cell lung cancer. Chronic postoperative thoracotomy pain, post-thoracotomy pain syndrome (PTPS), is a condition occurring in 50% of postsurgical patients with lung cancer and is largely unrecognized. This article examines the diagnosis and treatment of PTPS to assist oncology nurses in providing better care to this patient population. Post-thoracotomy pain in patients with lung cancer may be under-reported and undertreated. Causes from the thoracotomy can be trauma and compression to the intercoastal nerves, fractured and compressed ribs, inflammation of the chest muscles, atrophy of chest muscles, or scar tissue rubbing. This article examines the diagnosis and treatment of PTPS to assist oncology nurses in providing better care to this patient population. If left untreated, chronic pain can have a deleterious effect on patients' recovery and overall well-being. Oncology nurses should be aware of the signs and symptoms of PTPS so that more patients are diagnosed and choose to seek treatment.

Stereotactic ablative radiotherapy for stage I NSCLC: Recent advances and controversies

Stereotactic ablative radiotherapy (SABR) is a technique that has rapidly entered routine care for early-stage peripheral non-small cell lung cancer in many countries in the last decade. The adoption of SABR was partly stimulated by advances in the so-called 'image guided' radiotherapy delivery. In the last 2 years, a growing body of publications has reported on clinical outcomes, acute and late radiological changes after SABR, and sub-acute and late toxicity. The local control rates in many publications have exceeded 90% when tumors of up to 5 cm have been treated, with corresponding regional nodal failure rates of approximately 10%. However, these results are not universal: lower control rates reported by some authors serve to emphasize the importance of quality assurance in all steps of SABR treatment planning and delivery. High-grade toxicity is uncommon when so-called 'risk-adapted' fractionation schemes are applied; an approach which involves the use of lower daily doses and more fractions when critical normal organs are in the proximity of the tumor volume. This review will address the new data available on a number of controversial topics such as the treatment of patients without a tissue diagnosis of malignancy, data on SABR outcomes in patients with severe chronic obstructive airways disease, use of a classification system for late radiological changes post-SABR, late treatment-related toxicity, and the evidence to support a need for expert multi-disciplinary teams in the follow-up of such patients.

Abdominal wall bulging after thoracic surgery, an underdiagnosed wound complication

BACKGROUND

Complications after thoracic surgery have well been established, pain being the most prominent. Intercostal nerves are mixed type nerves combining motor and sensory functions. This notion is not consistent with the incidence of PTPS compared to the incidence of muscle paresis or paralysis. We would hypothesize that abdominal wall paresis or paralysis is underdiagnosed.

METHODS

In our hospital, three patients developed abdominal wall paralysis after thoracic surgery and consequent nerve damage. Their cases are discussed, and a review of the literature was conducted concerning (intercostal) nerve damage on a cellular level, the anatomy of the intercostal nerve, prevention of intercostal nerve damage and surgical techniques.

RESULTS

A cellular cascade known as Wallerian degeneration and regeneration determine whether a damaged nerve can function again. The recovery of the nerve is highly dependent on the correct function of activated Schwann cells and macrophages and is related to the amount of damage that has taken place. The anatomy of the intercostal nerve makes it susceptible to injury. Retractor placement during open thoracic surgery has shown to effect compression injury and induced mechanical deformation and damage. Given the known factors of pathophysiology and anatomy, a number of preventive measures have been tested to reduce intercostal nerve damage. Several techniques have been proposed, but the most used technique, the video-assisted thoracic surgery, has been the most effective in reducing nerve damage.

CONCLUSION

Abdominal wall paralysis is an underdiagnosed complication after thoracic surgery. The amount of stress on the intercostal nerves could be reduced with less invasive techniques such as the VATS technique.

An innovative case report detailing the successful treatment of post-thoracotomy syndrome with peripheral nerve field stimulation

INTRODUCTION

The detrimental effects of post-thoracotomy pain syndrome is experienced worldwide; however, an effective treatment regimen remains elusive.

METHODS

We report a case of post-thoracotomy pain syndrome effectively treated with peripheral nerve field stimulation (PNfS).

RESULTS

In the presented case, the patient underwent permanent placement of the PSfS device after a successful trial period. Upon follow-up the patient has reported even better coverage over her painful areas and admits to 80% and higher reductions in her painful symptoms.

CONCLUSION

Although the data are limited, in the aforesaid case report, post-thoracotomy syndrome was effectively treated with the use of PNfS. This resulted in a significant pain perception reduction, increased quality of life and mobility, as well as decreased usage of oral pain medications. This adds to the accumulating case report and case series data that suggest PNfS is showing great promise as a pain reduction modality. Further, it is minimally invasive, can be trialled prior to implantation, and is reversible. Large prospective studies will be required in the future to further evaluate its efficacy before it can be widely accepted and adopted.

Spinal cord stimulation to treat postthoracotomy neuralgia: non-small-cell lung cancer: a case report

Surgery is the mainstay of therapy for resectable-type tumors associated with non-small-cell lung cancer. Today, thoracotomy and video-assisted thoracotomy are surgical options. The prevalence of chronic pain with neuropathic symptoms is relatively high after thoracotomy. Spinal cord stimulation to treat such pain has received limited attention in the literature. The aim of this article is to report on the use of spinal cord stimulation in a single case of neuralgia after thoracotomy with lobectomy to treat non-small-cell lung cancer. At 24 months after implantation of the spinal cord stimulation system, the patient reported >75% pain relief, an overall improvement in quality of life-described as less pain with breathing, and improved functional ability pertaining to arm movements-and improved sleep patterns. This detailed case presentation provides a qualitatively weighted investigation into spinal cord stimulation for postthoracotomy neuralgia against the backdrop of oncologic care. Further investigations relying on quantitative assessment tools are necessary to further explore this form of therapy in this patient population. In the single case reported here, the use of spinal cord stimulation suppressed intractable pain targeted at the T6 and T7 dermatomes of the chest wall in the manifestation of postthoracotomy neuralgia.

Incidence and risk factors for chest wall toxicity after risk-adapted stereotactic radiotherapy for early-stage lung cancer

INTRODUCTION

High local control rates are reported after stereotactic ablative body radiotherapy (SABR) in stage I non-small cell lung cancer. Toxicity is uncommon, but few reports on long-term follow-up are available. We studied the incidence of chest wall pain (CWP) and rib fractures in patients with long-term follow-up.

METHODS

Between 2003 and 2009, 500 patients (530 tumors) underwent SABR using risk-adapted fractionation schemes, consisting of three fractions of 20 Gy, five fractions of 12 Gy, or eight fractions of 7.5 Gy. Toxicity data were collected in a prospective database and scored using Common Terminology Criteria for Adverse Events (CTCAE) version 4.03. Chest wall volumes receiving doses of 30, 40, 45, and 50 Gy (V30 Gy-V50 Gy) and maximum dose in 2 cm of chest wall (D2 ml) were determined for patients with CWP or rib fractures (n = 57).

RESULTS

With a median follow-up of 33 months, the 3-year overall survival and local control rates were 53.1% and 90.4%, respectively. CWP developed in 11.4% of patients and was severe (grade 3) in 2.0%. Rib fractures were observed in eight patients (1.6%), accompanied by CWP in seven of these patients. On multivariate analysis, patients with CWP had larger treatment volumes and shorter tumor-chest wall distances, whereas patients with rib fractures had larger tumor diameters and treatment volumes. Grade 3 CWP and rib fractures were associated with larger volumes of chest wall receiving doses of 30 to 50 Gy and rib fractures specifically with a higher maximum dose in the chest wall.

CONCLUSIONS

Severe (grade 3) chest wall toxicity is uncommon after risk-adapted SABR and manifests in 2% or fewer of patients.

Preoperative gabapentin for acute post-thoracotomy analgesia: a randomized, double-blinded, active placebo-controlled study

BACKGROUND

The role of preoperative gabapentin in postoperative pain management is not clear, particularly in patients receiving regional blockade. Patients undergoing thoracotomy benefit from epidural analgesia but still may experience significant postoperative pain. We examined the effect of preoperative gabapentin in thoracotomy patients.

METHODS

Adults undergoing elective thoracotomy were enrolled in this prospective, randomized, double-blinded, placebo-controlled study, and randomly assigned to receive 600 mg gabapentin or active placebo (12.5 mg diphenhydramine) orally within 2 hours preoperatively. Standardized management included thoracic epidural infusion, intravenous patient-controlled opioid analgesia, acetaminophen and ketorolac. Pain scores, opioid use and side effects were recorded for 48 hours. Pain was also assessed at 3 months.

RESULTS

One hundred twenty patients (63 placebo and 57 gabapentin) were studied. Pain scores did not significantly differ at any time point (P = 0.53). Parenteral and oral opioid consumption was not significantly different between groups on postoperative day 1 or 2 (P > 0.05 in both cases). The frequency of side effects such as nausea and vomiting or respiratory depression was not significantly different between groups, but gabapentin was associated with decreased frequency of pruritus requiring nalbuphine (14% gabapentin vs. 43% control group, P < 0.001). The frequency of patients experiencing pain at 3 months post-thoracotomy was also comparable between groups (70% gabapentin vs. 66% placebo group, P = 0.72).

CONCLUSIONS

A single preoperative oral dose of gabapentin (600 mg) did not reduce pain scores or opioid consumption following elective thoracotomy, and did not confer any analgesic benefit in the setting of effective multimodal analgesia that included thoracic epidural infusion.

Comparison of epidural analgesia and intercostal nerve cryoanalgesia for post-thoracotomy pain control

Epidural analgesia is regarded as the gold method for controlling post-thoracotomy pain. Intercostal nerve cryoanalgesia can also produce satisfactory analgesic effects, but is suspected to increase the incidence of chronic pain. However, randomized controlled trials comparing these two methods for post-thoracotomy acute pain analgesic effects and chronic pain incidents have not been conducted previously. We studied 107 adult patients, allocated randomly to thoracic epidural bupivacaine and morphine or intercostal nerve cryoanalgesia. Acute pain scores and opioid-related side effects were evaluated for three postoperative days. Chronic pain information, including the incidence, severity, and allodynia-like pain, was acquired on the first, third, sixth and twelfth months postoperatively. There was no significant difference on numeral rating scales (NRS) at rest or on motion between the two groups during the three postoperative days. The patient satisfaction results were also similar between the groups. The side effects, especially mild pruritus, were reported more often in the epidural group. Both groups showed high incidence of chronic pain (42.1-72.1%), and no significance between the groups. The incidence of allodynia-like pain reported in cryo group was higher than that in Epidural group on any postoperative month, with significance on the sixth and the twelfth months postoperatively (P<0.05). More patients rated their chronic pain intensity on moderate and severe in cryo group and interfered with daily life (P<0.05). Both thoracic epidural analgesia and intercostal nerve cryoanalgesia showed satisfactory analgesia for post-thoracotomy acute pain. The incidence of post-thoracotomy chronic pain is high. Cryoanalgesia may be a factor that increases the incidence of neuropathic pain.

The corneal pain system. Part I: the missing piece of the dry eye puzzle

The traditional model of dry eye disease based on tear deficiency has presented us with many unanswered questions. Recent studies support the notion that dry eye-like symptoms represent non-specific corneal pain and provide new insights into the mechanisms that sustain the integrity of the optical tear layer. Thus, this enigmatic disease can be viewed with a new perspective, which involves the dysfunctional corneal pain system as a central pathogenetic feature of a series of disorders collectively known today as dry eye.

Suture techniques of the intercostal space in thoracotomy and their relationship with post-thoracotomy pain: a systematic review

Post-thoracotomy pain is a symptom of high incidence among patients who have undergone thoracotomy and is a major risk factor in the pathogenesis of several postoperative complications. Chronic pain after thoracotomy reaches a high prevalence. Since the earliest studies, this pain has been seen to be related with intercostal nerve injury, thus the need to avoid these lesions during thoracotomy has been recommended. This review aims to establish the appropriate surgical procedure for closure of the thoracotomy through a systematic review of the literature and analysis of levels of evidence provided by the studies found. After an exhaustive search in MEDLINE, EMBASE, IME, IBECS and Cochrane Library, few studies were found. Each focuses on different aspects of thoracotomy surgical techniques, with a common denominator focused on the preservation of the intercostal nerves, and conclusions with different levels of evidence.

Subcutaneous peripheral neurostimulation for the treatment of severe chronic poststernotomy neuralgia

OBJECTIVE

Poststernotomy pain frequently develops after sternotomy in thoracic and cardiovascular surgery, and may affect patients' quality of life. In some cases of severe poststernotomy neuralgia, pharmacologic therapy does not provide adequate relief.

CASE REPORT

We report on a 42- year-old woman who underwent sternotomy for aortic and mitral valve replacement. She developed severe chronic poststernotomy neuralgia that was refractory to medical treatment. After local anesthesia markedly but only transiently alleviated pain, we considered the option of subcutaneous peripheral neurostimulation (SPNS). Plate electrodes were implanted bilaterally in the parasternal region at the site of maximal pain. After a period of test stimulation, the electrodes were connected to a dual-channel implantable pulse generator. SPNS induced paresthesias in the painful area. Revision surgery was necessary twice because of electrode migration. Chronic SPNS markedly alleviated pain (visual-analog scale, VAS, 9/10 preoperatively, 2/10 postoperatively) and allodynia (VAS 9/10 preoperatively, 2/10 postoperatively) at the last available follow-up, 15 months postoperatively.

CONCLUSIONS

SPNS may be a viable treatment option in patients with severe chronic poststernotomy neuralgia.

Palliative care in lung cancer

Advancements in the surgical and medical treatment of lung cancer have resulted in more favorable short-term survival outcomes. After initial treatment, lung cancer requires continued surveillance and follow-up for long-term side effects and possible recurrence. The integration of quality palliative care into routine clinical care of patients with lung cancer after surgical intervention is essential in preserving function and optimizing quality of life through survivorship. An interdisciplinary palliative care model can effectively link patients to the appropriate supportive care services in a timely fashion. This article describes the role of palliative care for patients with lung cancer.

Operative treatment of chest wall injuries: indications, technique, and outcomes

Most injuries to the chest wall with residual deformity do not result in long-term respiratory dysfunction unless they are associated with pulmonary contusion. Indications for operative fixation include flail chest, reduction of pain and disability, a chest wall deformity or defect, symptomatic nonunion, thoracotomy for other indications, and open fractures. Operative indications for chest wall injuries are rare.