Diretrizes para a prevenção, diagnóstico e tratamento da hiperidrose compensatória

Incidence and Severity of Compensatory Hyperhidrosis Following Bilateral Sympathectomy

BACKGROUND

Primary hyperhidrosis is a condition caused by an excessive stimulation of sweat glands, leading to a decline in both quality of life and social wellbeing. Thoracic sympathectomy surgery provides a relief of the initial symptoms but poses a risk for developing compensatory hyperhidrosis (CH) in various degrees.

OBJECTIVE

The aim of this study was to assess the occurrence and characteristics of CH post-thoracic sympathectomy.

METHODS

A retrospective cohort study of patients who underwent video-assisted thoracic sympathectomy surgery at level T2-T3 between 2016 and 2022 was conducted. Patients' data were retrieved from medical records and through a telephone interview.

RESULTS

A total of 50 patients (32 males and 18 females) were operated on with a mean ± standard deviation (SD) age of 25.9 ± 7.4 years at the time of surgery for palmoplantar hyperhidrosis. Initial symptoms started in childhood at a mean ± SD age of 11.4 ± 3.3 years. Postoperatively, 39 patients (78%) developed CH, more prevalent in males (64.1%) compared to females (35.8%). This CH mainly affected the back and abdomen (100%), followed by the groin and thighs (28.2%), and, to a lesser extent, the craniofacial area (15.3%). Onset of symptoms occurred within 1 week after surgery in 71.7% of cases, with 71.7% reporting mild to moderate symptoms. CH was significantly associated with higher age at the time of surgery, smoking status, and a longer time lapse in the surgery operation (P value < 0.05).

CONCLUSIONS

Thoracic sympathectomy is an effective procedure with a high success rate. Despite a relatively higher occurrence of CH, most patients experience milder symptoms and express satisfaction, noting that their expectations were met following the surgery.

Anatomical variations of the thoracic sympathetic ganglions and their effects on sympathicotomy for primary palmar hyperhidrosis

PURPOSE

The results and side effects of sympathicotomy for primary palmar hyperhidrosis (PPH) can vary due to anatomical variations of the sympathetic ganglions. The aim of our study was to clarify anatomical variations of the sympathetic ganglions by near-infrared (NIR) thoracoscopy and determine their effects on sympathicotomy for PPH.

METHODS

The cases of 695 consecutive patients with PPH treated with either R3 or R4 sympathicotomy either by normal thoracoscopy or by NIR fluorescent thoracoscopy between March 2015 and June 2021 were retrospectively reviewed and followed up.

RESULTS

The variation rate of third and fourth ganglions was 14.7% and 13.3% on the right side and 8.3% and 11.1% on the left side. Real T3 sympathicotomy (RTS₃) was more effective than real T4 sympathicotomy (RTS₄) in the short-term and long-term follow-up (p < 0.001 and p < 0.001, respectively). RTS₃ was more satisfactory than RTS₄ in the long-term follow-up (p = 0.03), but no significant difference was found in the short-term follow-up (p = 0.24). The incidence and severity of compensatory hyperhidrosis (CH) in the areas of the chest and back in the RTS₄ group were significantly lower than those in the RTS₃ group according to both the short-term results (12.92% vs. 26.19%, p < 0.001; 17.97% vs. 33.33%, p = 0.002, respectively) and the long-term results (19.66% vs. 28.57%, p = 0.017; 21.35% vs. 34.52%, p < 0.001, respectively).

CONCLUSIONS

RTS₃ may be more effective than RTS₄ for PPH. However, RTS₄ appears to be associated with a lower incidence and severity of CH in the areas of the chest and back than RTS_3. NIR intraoperative imaging of thoracic sympathetic ganglions may improve the quality of sympathicotomy surgeries.

Surgical management of compensatory sweating: A systematic review

Endoscopic thoracic sympathectomy (ETS) surgery is a highly effective treatment of primary hyperhidrosis (PH) for the palms, face, axillae. Compensatory sweating (CS) is the most common and feared side effect of thoracic sympathectomy. CS is a phenomenon characterized by increased sweating in sites distal to the level of sympathectomy. Compensatory sweating is the main problem for which many patients give up surgery, losing the chance to solve their problem and accepting a poor quality of life. There are still no treatments that offer reliable solutions for compensatory sweating. The treatments proposed in the literature are scarce, with low case histories, and with uncertain results. Factors associated with CS are extension of manipulation of the sympathetic chain, level of sympathetic denervation, and body mass index. Therapeutic options include non surgical treatment and surgical treatment. Non surgical treatments include topical agents, botulinum toxin, systemic anticholinergics, iontophoresis. Surgical treatments include clip removal, extended sympathectomy and sympathetic chain reconstruction, although the efficacy is not well-established for all the methods. In this review we provide an overview of the treatments and outcomes described in the literature for the management of compensatory CS, with focus on surgical treatment.

Computed Tomography-Guided Percutaneous T4 Thoracic Sympathetic Radiofrequency Thermocoagulation for Primary Palmar Hyperhidrosis: A Retrospective Observational Trial

PURPOSE

To evaluate the efficacy, safety, and patient satisfaction of computed tomography (CT)-guided percutaneous T4 thoracic sympathetic radiofrequency thermocoagulation (RFT) for the treatment of primary palmar hyperhidrosis (PPHH).

MATERIALS AND METHODS

A total of 158 patients who underwent bilateral thoracic sympathetic RFT at the T4 level were analysed. Hyperhidrosis Severity Scale (HDSS), Dermatologic Quality of Life Index (DLQI), patient satisfaction, and adverse events were evaluated within 12 months after RFT.

RESULTS

The mean age of the patients was 25.27 years, and 95 (60.1%) were females. The technical success, defined as planned needle placement and completion of RFT, was 99.4%. After the procedure, 243 hands (77.4%) were completely dry; and 58 hands (18.4%) were partially dry. From before RFT to 12 months after RFT, the proportion of hands with the HDSS grades 3 and 4 from 100% decreased to 31.9%; and that with the DLQI scores D and E from 100% decreased to 4.0% (P < .001). The clinical success rate was 76.6%, and the patient satisfaction rate was 80.8% at 12 months after RFT. During the procedures, there was unilateral local bleeding in two patients (0.6%) and bradycardia in five patients (3.2%); after the procedures, unilateral pneumothorax occurred in 15 patients (4.7%) and closed thoracic drainage was performed in two patients (0.6%); thoracic neuralgia occurred in 24 patients (15.2%). The incidence of compensatory hyperhidrosis (CH) 12 months after RFT was 15.2%.

CONCLUSIONS

CT-guided percutaneous T4 thoracic sympathetic RFT is safe, effective, and minimally invasive for the treatment of PPHH.

LEVEL OF EVIDENCE

Level 2 observational study with dramatic effect.

Thoracoscopic bilateral dorsal sympathectomy for primary palmo-axillary hyperhidrosis short- and mid-term results

BACKGROUND

Thoracoscopic bilateral dorsal sympathectomy is the standard of care for primary palmo-axillary hyperhidrosis. This study aims at studying the surgical outcomes with special emphasis on the incidence of compensatory hyperhidrosis (CH) after thoracoscopic dorsal sympathectomy. Post-procedural patient satisfaction as well as quality of life was measured and analysed.

MATERIALS AND METHODS

This is a retrospective analysis of sixty thoracoscopic dorsal sympathectomy surgeries in thirty patients in a tertiary level thoracic surgery centre over 2 years. Various peri-operative variables were recorded and assessed. Incidence of CH was noted and analysed in relation to patient satisfaction and record was made of quality of life at the time of discharge, at 3 months and 1-year follow-up following surgery.

RESULTS

We performed sixty video-assisted thoracoscopic sympathectomies in 30 patients. The mean operative time was 44.93 ± 10 min. The mean hospital stay was 1 day. There were no immediate post-procedural complications. All the patients had complete resolution of palmar and axillary hyperhidrosis. Fifty per cent of our patients (15/30) had some degree of CH after surgery. Quality-of-life measurement showed very good satisfaction by 100% at discharge, by 93.3% at 3 months and at 1 year. Those 6.66% of patients were partially satisfied/not satisfied because of the presence of moderate-to-severe CH.

CONCLUSION

A significant percentage of the patients with primary palmo-axillary hyperhidrosis will be very satisfied with the procedure at 1 year after surgery despite 50% of them developing CH. Detailed counselling regarding CH in the pre-operative period would minimise the dissatisfaction rate after surgery.

Current treatment options for craniofacial hyperhidrosis

Hyperhidrosis (HH) is characterized by sweating exceeding the amount necessary to meet the thermal regulation and physiological needs of the body. Approximately 9.41% of individuals with HH have craniofacial hyperhidrosis (FH). The present study aims to review the most current data in the literature regarding craniofacial hyperhidrosis, including pathophysiology, diagnosis and clinical presentation, treatment options (clinical and surgical), and outcomes. VATS (videothoracoscopy sympathectomy) is considered the gold standard for definitive treatment of axillary or palmar hyperhidrosis. Recently, several studies have shown the usefulness of clinical treatment with oxybutynin hydrochloride, leading to clinical improvement of HH in more than 70% of users. Both clinical and surgical treatment of craniofacial hyperhidrosis have good results. However, surgical treatment of FH is associated with more complications. Clinical treatment with oxybutynin hydrochloride yields good results and can be the first therapeutic option. When the patient is not satisfied with this treatment and has good clinical conditions, surgical treatment can be used safely.

Radiofrequency in the treatment of primary hyperhidrosis: systematic review and meta-analysis

PURPOSE

To evaluate, via a systematic review, the effectiveness of radiofrequency (RF) for treatment of primary hyperhidrosis (PH).

METHODS

Experimental or observational studies were included where RF treatment (ablation or microneedling) was performed, comparing the periods before and after treatment.

RESULTS

Nine studies were considered eligible and included for analysis. In seven of nine studies, patients were subjected to RF only, and in two of nine studies RF was compared to video-assisted thoracoscopic sympathectomy (VATS). There was a reduction in the severity of PH in microneedling (three studies, mean difference -1.24, 95% CI -1.44 to -1.03). In a study that performed sympathetic RF ablation there was a greater reduction in PH severity compared to studies that performed microneedling (-2.42, 95% CI -2.55 to -2.29). There was improvement in the quality of life (QoL) after sympathetic RF ablation (two studies, mean difference -15.92, 95% CI -17.61 to -14.24). Regarding the microneedling procedure, there was a lower improvement in QoL, (two studies, -9.0, 95% CI -9.15 to -8.85). One study comparing sympathetic RF ablation with VATS applied the QoL questionnaire, and the VATS showed superior results. One of the two studies comparing compensatory sweating in RF ablation with VATS showed that compensatory hyperhidrosis was higher in VATS; however, the other study did not observe this difference. One study compared the recurrence of symptoms between VATS and RF ablation; symptom recurrence was shown to be higher in RF.

CONCLUSIONS

RF is effective for PH treatment, with superior results obtained with sympathetic ablation compared to microneedling.

Comparative study of transepidermal water loss in patients with and without hyperhidrosis by closed-chamber measurer in an air-conditioned environment

Objective

To evaluate the difference in transepidermal water loss in patients diagnosed with hyperhidrosis and healthy subjects, in an air-conditioned environment.

Methods

Twenty patients diagnosed with hyperhidrosis and 20 healthy subjects were subjected to quantitative assessment using a closed-chamber device, in six previously established sites.

Results

The measurements showed different transepidermal water loss values for healthy subjects and patients with hyperhidrosis, especially in the hands and feet. In the Control Group, the median for the hands was 46.4g/m²/hour (p25: 36.0; p75: 57.6), while in the Hyperhidrosis Group, the median was 123.5g/m²/hour (p25: 54.3; p75: 161.2) – p<0.001. For the feet, the Control Group had a median of 41.5g/m²/hour (p25: 31.3; p75: 63.5) and the Hyperhidrosis Group, 61.2g/m²/hour (p25: 32.3; p75: 117) – p<0.02. Measurements of the axillas also showed differences. In the Control Group, the median was 14.8g/m²/hour (p25: 11.8; p75: 19.0) and, in the Hyperhidrosis Group, 83.5g/m²/hour (p25: 29.5; p75: 161.7) – p<0.001.

Conclusion

Measuring transepidermal water loss is sufficient for diagnosis and follow-up of patients with hyperhidrosis.

A retrospective review on minimally invasive technique via endoscopic thoracic sympathectomy (ETS) in the treatment of severe primary hyperhidrosis: Experiences from the National Heart Institute, Malaysia

Background: Hyperhidrosis is due to the hyperactive autonomic stimulation of the sweat glands in response to stress. Primary hyperhidrosis is a common yet psychologically disabling condition. This study will describe our experience in managing hyperhidrosis via endoscopic thoracic sympathectomy (ETS).

Methods: The information was obtained from the patient records from 1 ^st January 2011 until 31 ^st December 2016. Pertinent information was extracted and keyed into a study proforma.

Results:  150 patients were operated on but only 118 patients were included in this study. The mean age was 22.9±7.3 years. The majority (54.2%) had palmar-plantar hyperhidrosis and 39.8% had associated axillary hyperhidrosis. Excision of the sympathetic nerve chain and ganglia were the main surgical technique with the majority (55.9%) at T2-T3 level. Mean ETS procedure time was 46.6±14.29 minutes with no conversion. Surgical complications were minimal and no Horner’s Syndrome reported. Mean hospital stay was 3.5±1.05 days. The majority of patients (67.8%) had only one follow-up and only half of the study sample (58.5%) complained mild to moderate degree of compensatory sweating, even though the long-term resolution is yet to be determined by another study. Following ETS, 98.3% of patients had instant relief and resolved their palmar hyperhidrosis. Predictors of CS were sympathectomy level and follow-up. The odds of reporting CS was 2.87 times in patients undergoing ETS at the T2-T3 level compared to those undergoing ETS at the T2-T4 level. The odds of reporting CS was 13.56 times in patients having more than one follow-up compared to those having only one follow-up.

Conclusion: We conclude that ETS is a safe, effective and aesthetically remarkable procedure for the treatment of primary hyperhidrosis  with only half of the patients developing mild to moderate degree of CS. Significant predictors of CS were sympathectomy level during ETS and frequency of follow-up after ETS.

Pulsed radiofrequency stimulation suppresses palmar hyperhidrosis in an animal study

OBJECTIVES

Palmar hyperhidrosis (PH) exhibits excessive and unpredictable sweating. The most effective treatment for permanent cure is the ablation of thoracic sympathetic ganglia innervating hands. However, sympathectomy of T2 sympathetic ganglion by clipping or cauterization causes irreversible nerve damage, and results in a compensatory hyperhidrosis (CH). We herein used the pulsed radiofrequency (PRF) stimulation to reversibly block sympathetic ganglion to treat PH and avoid CH.

MATERIAL AND METHODS

A bipolar electrode was implanted into the right T2 sympathetic trunk by endoscopic surgery and PRF was delivered through the electrode. The humidity (%) of right palm was measured to indicate sweating level.

RESULTS

Six out of 13 rats (46.2%) that received a 5-min PRF stimulation on the T2 sympathetic trunk showed a decrease in the right palm humidity during the surgery. PRF stimulation significantly reduced humidity from 69.17% ± 0.72% obtained from baseline condition to 66.93% ± 0.69%. The humidity reduction was also observed at 10 min after the PRF stimulation. We further evaluated the effect of PRF stimulation 1 week after surgery and found that the PRF stimuli reduced right hand humidity in 5 out of 8 rats (62.5%). PRF stimulation significantly reduced humidity from 66.11% ± 0.81% obtained from sham operation control to 63.62% ± 0.82%. The percentage of right hand humidity obtained 10 min after PRF stimulation was also reduced to 63.38% ± 0.80%. Anesthetics have no effect on humidity.

CONCLUSIONS

These results indicate that PRF stimulation of T2 sympathetic trunk reduces palm sweating in rats.

Thoracic sympathectomy for hyperhidrosis: from surgical indications to clinical results

Sympathectomy and its variations have been performed in thoracic surgery for more than 100 years. However, its indications have undergone profound modifications in this period. Likewise, since then the surgical technique has also evolved dramatically up to the minimally invasive techniques worldwide accessible in present days. Currently, primary hyperhidrosis is, by far, the main indication for thoracic sympathectomy and this procedure is usually carried out thoracoscopically with excellent results. However, until today, hyperhidrosis is a part of thoracic surgery still surrounded by controversy, persisting as an open field over which some confusion still resides regarding its pathophysiology, terms definitions and operative approaches. The aim of this article is to provide a wide but easily comprehensible review of the theme, discussing and clarifying the major concepts with respect to its clinical presentation, all the presently available treatment options and strategies with their potential benefits and risks, the adequate patient selection for sympathectomy, as well as the postoperative clinical results.

Relationship between anxiety, depression and quality of life with the intensity of reflex sweating after thoracoscopic sympathectomy for treatment of primary hyperhidrosis

ABSTRACT Objective: to compare the intensity of reflex sweating with the degree of anxiety and its interference in the quality of life of patients undergoing Thoracoscopic (VATS) sympathectomy in the pre- and postoperative period. Methods: we evaluated 54 patients with a mean age of 26 years (16-49 years) undergoing sympathectomy in the R3-R4 level. We applied two questionnaires at three different times: "Quality of life in patients with primary hyperhidrosis" and "Scale for anxiety and depression". Results: of the patients studied, 93% showed significant improvement in quality of life 30 days after surgery, the effects remaining after six months. There were no postoperative complications. The patient's level of anxiety is highly correlated with the intensity of reflex sweating after 30 and 180 days. Conclusion: Thoracoscopic sympathectomy improves quality of life of patients with primary hyperhidrosis, even with the emergence of reflex sweating. Anxiety directly relates to the intensity of reflex sweating, without compromising the degree of patient satisfaction.

Patient Satisfaction after Thoracoscopic Sympathectomy for Palmar Hyperhidrosis: Do Method and Level Matter?

CONTEXT

Although surgery is widely recognized as the best treatment for palmar hyperhidrosis (PH), the decision to perform a sympathicotomy, sympathectomy, or clipping of the thoracic sympathetic chain is based on surgeon preference.

OBJECTIVE

We investigated the outcomes of patients who underwent surgical intervention for PH with regard to method used and level of sympathetic chain interrupted.

DESIGN

This was a retrospective medical chart review. Patients who underwent thoracoscopic intervention for PH were mailed questionnaires regarding their presenting and postoperative symptoms and satisfaction 6 months to 15 years after their procedure. Analyses were performed to investigate whether the surgical method applied affected these outcomes.

RESULTS

A total of 635 patients underwent bilateral thoracoscopic procedures for PH between April 1995 and February 2010, and 210 (33%) responded to the questionnaires. Sixteen surgeons performed 108 sympathicotomies, 83 sympathectomies, and 19 ligations with titanium clips for PH. Mean follow-up was 5.5 years. Overall palmar success was 85.4% and was not affected by the surgical method. The rate of compensatory hyperhidrosis was significantly lower if the operative level did not include the R2 ganglion (66.7% vs 80.6%, p = 0.028). Nevertheless, 76.2% of patients were satisfied with the results, and 85.7% would repeat the procedure if given the option to do it again.

CONCLUSION

Most patients reported relief of their PH and were satisfied with surgical intervention, regardless of method used. Although postoperative compensatory hyperhidrosis was common, this did not appear to affect overall patient satisfaction. The inclusion of rib level 2 ganglion resulted in a significantly increased incidence of compensatory hyperhidrosis.

Surgical treatment of axillary hyperhidrosis by suction-curettage of sweat glands

Suction curettage is a dermatologic surgery technique for the treatment of axillary hyperhidrosis, which is becoming more popular.

OBJECTIVE

The purpose of this study is to describe the current technique of removal of axillary sweat glands, and evaluate its efficacy and safety.

CONCLUSION

Suction-curettage of sweat glands is a minimally invasive surgical technique that is easy to perform, safe, has high rates of success and relatively few side-effects. It is generally well tolerated by patients and requires shorter time away from daily activities, when compared with other surgical modalities.

Effectiveness of oral glycopyrrolate use in compensatory hyperhidrosis patients

Compensatory hyperhidrosis or reflex hyperhidrosis is the increase in sweating in the postoperative stage of thoracic sympathectomy or lumbar sympathectomy. It shares several features with anxiety disorders and has a negative impact on a patient's quality of life. Oralglycopyrrolate is one of the treatment options available. This study reviewed case notes in a series of 19 patients with compensatory hyperhidrosis. We made a comparison between the Milanez de Campos score of a pre-glycopyrrolate medication group and the Milanez de Campos score of a post-glycopyrrolate medication group. The Beck Depression Inventory (BDI) score, Beck Anxiety Inventory (BAI) score, and autonomic nervous system (ANS) scale score were also compared between the pre-medication and post-medication groups. In the post-glycopyrrolate medication group, there was decrease in the Milanez de Campos score, BAI score, and BDI score (P < 0.05). But no meaningful change was seen in the ANS score in the post-glycopyrrolate medication group (P > 0.05). Glycopyrrolate is an effective medication in the treatment of compensatory hyperhidrosis that, can alleviate anxiety and improve patients' quality of life.

In the search for the treatment of compensatory sweating

Background. Despite success of thoracic sympathectomy (ETS), there are patients that develop postoperatively intensive sweating of the trunk. The aim of the study was to present outcomes of three of those methods: removal of the clips, clipping of T6-9, and regional abdomino-lumbar iontophoresis (RALI). Methods. Out of the group of 229 patients treated with ETS, there were 9 that requested removal of the clips, 3 were treated with T6-9 video thoracoscopic block, and 5 were treated with RALI. The intensity of the side effect has been evaluated subjectively (with overall and localized perception of intensity of sweating) and objectively (with gravimetry). Results. The removal of the clips resulted in slow (about 12 months) diminishing of the intensity of sweating of the trunk; but the symptom did not disappear to the degree satisfactory for the patients. The T6-9 block resulted in partial and transient diminishing of the symptom. The iontophoresis resulted in very promising short-term results. Conclusion. Removal of the clips from the sympathetic trunk does not provide resolution of compensatory sweating in 1 year of observation. T6-9 block does not provide remedy for compensatory hyperhidrosis. Regional abdomino-lumbar iontophoresis seems to be very promising, but further research and followup are mandatory.

Thoracoscopic Sympathicotomy vs Sympathectomy in Primary Hyperhidrosis

Background

Primary hyperhidrosis (P.H.H.) is characterized by excessive sweating in certain parts of body. It’s estimated prevalence is 0%-6.1% in different populations. In Asian population its prevalence is around 3%. In 57% of cases, there is a positive family history.

Objectives

To evaluate and compare the early and late satisfaction, outcomes and complications of thoracoscopic sympathectomy and sympathicotomy in the treatment of primary hyperhidrosis.

Materials and Methods

From April 2007 to January 2011, we prospectively treated 60 primary hyperhidrosis patients via thoracoscopic surgery. The first 30 patients underwent sympathectomy and the next 30 patients underwent sympathicotomy. We evaluated early and late satisfactions, outcomes and complications on the first visit (5-8days) following surgery and 12 months after surgery, for all patients.

Results

The mean operative time was 66.3 minutes in sympathicotomy group and 110.8 minutes in sympathectomy group (P < 0.001). There were no significant differences between the two groups in overall early and late satisfaction, gustatory sweating, pompholyx and post-operative pain. There was comparatively less early and late compensatory sweating (C.S.), and other adverse influences of C.S. in the sympathicotomy group.

Conclusions

Because of shorter operative time, less C.S. and less adverse influence of C.S., sympathicotomy seems a better treatment for primary hyperhidrosis, compared with sympathectomy.

The Society of Thoracic Surgeons expert consensus for the surgical treatment of hyperhidrosis

Significant controversies surround the optimal treatment of primary hyperhidrosis of the hands, axillae, feet, and face. The world's literature on hyperhidrosis from 1991 to 2009 was obtained through PubMed. There were 1,097 published articles, of which 102 were clinical trials. Twelve were randomized clinical trials and 90 were nonrandomized comparative studies. After review and discussion by task force members of The Society of Thoracic Surgeons' General Thoracic Workforce, expert consensus was reached from which specific treatment strategies are suggested. These studies suggest that primary hyperhidrosis of the extremities, axillae or face is best treated by endoscopic thoracic sympathectomy (ETS). Interruption of the sympathetic chain can be achieved either by electrocautery or clipping. An international nomenclature should be adopted that refers to the rib levels (R) instead of the vertebral level at which the nerve is interrupted, and how the chain is interrupted, along with systematic pre and postoperative assessments of sweating pattern, intensity and quality-of-life. The recent body of literature suggests that the highest success rates occur when interruption is performed at the top of R3 or the top of R4 for palmar-only hyperhidrosis. R4 may offer a lower incidence of compensatory hyperhidrosis but moister hands. For palmar and axillary, palmar, axillary and pedal and for axillary-only hyperhidrosis interruptions at R4 and R5 are recommended. The top of R3 is best for craniofacial hyperhidrosis.