capsaicin application
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Author(s):  
Rosa Hugosdottir ◽  
Mindy Kasting ◽  
Carsten Dahl Mørch ◽  
Ole Kæseler Andersen ◽  
Lars Arendt-Nielsen

Heat/capsaicin sensitization and electrical high frequency stimulation (HFS) are well known model of secondary hyperalgesia, a phenomenon related to chronic pain conditions. This study investigated whether priming with heat/capsaicin would facilitate hyperalgesia to HFS in healthy subjects. Heat/capsaicin priming consisted of a 45 °C heat stimulation for 5 min followed by a topical capsaicin patch (4x4 cm) for 30 minutes on the volar forearm of 20 subjects. HFS (100 Hz, 5 times 1s, minimum 1.5 mA) was subsequently delivered through a transcutaneous pin electrode approximately 1.5 cm proximal to the heat/capsaicin application. Two sessions were applied in a crossover design; traditional HFS (HFS) and heat/capsaicin sensitization followed by HFS (HFS+HEAT/CAPS). Heat pain threshold (HPT), mechanical pain sensitivity (MPS) and superficial blood perfusion were assessed at baseline, after capsaicin removal, and up to 40 min after HFS. MPS was assessed with pinprick stimulation (128 mN and 256 mN) in the area adjacent to both HFS and heat/capsaicin, distal but adjacent to heat/capsaicin and in a distal control area. HPT was assessed in the area of heat/capsaicin. Higher sensitivity to 128 mN pinprick stimulation (difference from baseline and control area) was observed in the HFS+HEAT/CAPS session than in the HFS session 20 and 30 minutes after HFS. Furthermore, sensitivity was increased after HFS+HEAT/CAPS compared to after heat/capsaicin in the area adjacent to both paradigms, but not in the area distal to heat/capsaicin. Results indicate that heat/capsaicin causes priming of the central- and peripheral nervous system, which facilitates secondary mechanical hyperalgesia to HFS.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
A. Di Lionardo ◽  
G. Di Stefano ◽  
C. Leone ◽  
G. Di Pietro ◽  
E. Sgro ◽  
...  

AbstractThe N13 component of somatosensory evoked potential (N13 SEP) represents the segmental response of dorsal horn neurons. In this neurophysiological study, we aimed to verify whether N13 SEP might reflect excitability changes of dorsal horn neurons during central sensitization. In 22 healthy participants, we investigated how central sensitization induced by application of topical capsaicin to the ulnar nerve territory of the hand dorsum modulated N13 SEP elicited by ulnar nerve stimulation. Using a double-blind placebo-controlled crossover design, we also tested whether pregabalin, an analgesic drug with proven efficacy on the dorsal horn, influenced capsaicin-induced N13 SEP modulation. Topical application of capsaicin produced an area of secondary mechanical hyperalgesia, a sign of central sensitization, and increased the N13 SEP amplitude but not the peripheral N9 nor the cortical N20-P25 amplitude. This increase in N13 SEP amplitude paralleled the mechanical hyperalgesia and persisted for 120 min. Pregabalin prevented the N13 SEP modulation associated with capsaicin-induced central sensitization, whereas capsaicin application still increased N13 SEP amplitude in the placebo treatment session. Our neurophysiological study showed that capsaicin application specifically modulates N13 SEP and that this modulation is prevented by pregabalin, thus suggesting that N13 SEP may reflect changes in dorsal horn excitability and represent a useful biomarker of central sensitization in human studies.


2021 ◽  
Author(s):  
Janne D. Christensen ◽  
Silvia Lo Vecchio ◽  
Hjalte H. Andersen ◽  
Jesper Elberling ◽  
Lars Arendt-Nielsen

2020 ◽  
Vol 2020 ◽  
pp. 1-4
Author(s):  
Ansar Aziz ◽  
Tayyab Waheed ◽  
Olubunmi Oladunjoye ◽  
Adeolu Oladunjoye ◽  
Midhat Hanif ◽  
...  

Introduction. Cannabinoid hyperemesis syndrome (CHS), associated with chronic cannabis use, presents with cyclic abdominal pain, nausea, and vomiting. With increasing use of marijuana, the incidence of CHS is expected to increase. Most patients with CHS make frequent visits to the emergency room and are usually refractory to conventional treatment. We, therefore, present a case of CHS successfully treated with topical capsaicin application. Case Presentation. A 41-year-old female with a recent excess use of cannabis presented to the emergency department for evaluation of recurrent excruciating epigastric pain accompanied by severe nausea and vomiting. She had similar, milder symptoms a year ago and underwent endoscopic evaluation which was negative except for mild reflux esophagitis for which she was started on a proton pump inhibitor. On this presentation, basic laboratory workup, EKG, and CT scan of abdomen and pelvis were unremarkable. A detailed abdominal exam was only positive for mild epigastric tenderness. She was instructed to continue pantoprazole and pain medication and outpatient repeat esophagogastroduodenoscopy. The patient returned the next day with extreme retching, nausea, and vomiting and was admitted for further evaluation. Intravenous fluids, antiemetics, and morphine were started for pain control with no symptomatic improvement. A diagnosis of cannabis hyperemesis syndrome was made based on history of chronic marijuana use and otherwise negative workup. A trial of topical capsaicin, over the epigastric region, was tried that provided dramatic relief within 24 hours. Repeat endoscopic evaluation had no evidence of ulcers, celiac disease, or esophagitis. She was discharged on topical capsaicin and counselled on marijuana abstinence, with no return of symptoms. Conclusion. Based on the dramatic resolution of symptoms with topical capsaicin, our case supports this promising intervention and provides an alternate approach to antiemetics and narcotics routinely used in patients with cannabis hyperemesis syndrome.


2020 ◽  
Vol 14 ◽  
Author(s):  
Noha M Hazem ◽  
Wagdi F ElKashef ◽  
Ibrahim M El-Sherbiny ◽  
Ahmed A Emam ◽  
Dalia Shaalan ◽  
...  

Background:: Hepatocellular carcinoma (HCC) is the fifth most frequent cancer worldwide with a low overall survival due to high metastasis and recurrence rates. The aim of this study is to assess and compare the possible anti-neoplastic effect of capsaicin and nanoformulated capsaicin on in vitro HCC human cell line HepG2. Materials and Methods:: Capsaicin-loaded trimethyl chitosan nanoparticles (CL TMCS NPs) were synthesized by iontropic gelation of cationic TMCS with capsaicin. The synthesized nanoparticles were characterized through TEM, and zeta analyzer. Human hepatocarcinoma HepG2 cell lines were cultured and treated with 50, 75 & 100 μM of capsaicin (CAP), plain TMCS NPs and CL-NPs as well as ethanol (control) for 24h and 48h. The induced effects were investigated by flow cytometry, immunocytochemistry assay for Bcl-2, Bax, and caspase proteins and evaluating gene expression levels of Bcl-2, Bax, and MDR-1 mRNA by real-time PCR. Results:: Our results demonstrated that capsaicin- loaded NPs had the potential to significantly increase capsaicin bioactivity compared with the plain capsaicin formulation either in inducing apoptosis through altering expression of apoptotic regulators or modifying MDR-1 expression. Conclusions:: TMCs nanoparticles investigated in this study may be a good drug delivery vehicle for capsaicin. Application of capsaicin-loaded NPs in HCC management as an adjunct therapeutic approach may be a novel strategy to improve the treatment efficacy and resistance of the conventionally used chemotherapy.


2020 ◽  
Vol 319 (3) ◽  
pp. G412-G419
Author(s):  
Midori Yoshihara ◽  
Takanori Tsujimura ◽  
Taku Suzuki ◽  
Kouta Nagoya ◽  
Naru Shiraishi ◽  
...  

Although a transient receptor potential vanilloid 1 (TRPV1) inhibitor or TRPV1-expressed neuronal inhibitor significantly inhibited HCl/capsaicin-evoked swallowing, air flow-induced swallowing was not affected. The number of air flow-induced swallows was significantly reduced within 60 min of TRPV1 activation. Evans blue dye concentration in the larynx increased 60 min after capsaicin application. TPRV1 activation not only desensitizes TRPV1 but also inactivates mechanoreceptors caused by increases in vascular permeability and edema.


2019 ◽  
Vol 7 (24) ◽  
Author(s):  
Petros G. Botonis ◽  
Panagiotis G. Miliotis ◽  
Stylianos N. Kounalakis ◽  
Maria D. Koskolou ◽  
Nickos D. Geladas

2019 ◽  
Vol 30 ◽  
pp. vi128
Author(s):  
Chutima Upachar ◽  
Supatra Kidwisala ◽  
Achaporn Petchdee ◽  
Sorrapong Manyanont ◽  
Orasit Sukreeyapongse ◽  
...  

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