DRG2 supports the growth of primary tumors and metastases of melanoma by enhancing VEGF-A expression.

Malignant metastatic melanoma (MM) is the most lethal of all skin cancers, but detailed mechanisms for regulation of melanoma metastasis are not fully understood. Here, we demonstrated that developmentally regulated GTP-binding protein 2 (DRG2) is required for the growth of primary tumors and for metastasis. DRG2 expression was significantly increased in MM compared with primary melanoma (PM) and dysplastic nevi. A correlation between DRG2 expression and poor disease-specific survival in melanoma patients was also identified. Furthermore, inhibition of DRG2 suppressed the binding of Hypoxia-inducible factor 1α to the VEGF-A promoter region, expression of vascular endothelial growth factor (VEGF)-A, and formation of endothelial cell tubes. In experimental mice, DRG2 depletion inhibited the growth of PM and lung metastases and increased survival. These results identify DRG2 as a critical regulator of VEGF-A expression and of growth of PMs and lung metastases.

Treatment of persistent postoperative hiccups with stellate ganglion block: Three case reports.

RATIONALE: Although persistent postoperative hiccups can cause various problems (such as sleep disorders, depression, fatigue) for the patient, there has been little research on this topic. The purpose of this study is to determine the effectiveness of treating persistent postoperative hiccups with a stellate ganglion block (SGB), an injection of local anesthetic in the sympathetic nerve tissue of the neck. PATIENT CONCERNS AND DIAGNOSES: Three patients each developed persistent hiccups within 3 days of abdominal surgery, lasting for 3 to 6 days. The patients were diagnosed as having persistent hiccups based on the hiccup duration. INTERVENTIONS AND OUTCOMES: The 3 patients were treated with an SGB. After the procedure, the frequency and intensity of hiccups decreased and then the hiccups stopped completely. CONCLUSION: An SGB is an effective method that can be considered in conjunction with other treatments for persistent hiccups. Clinicians should be mindful of the negative effects that persistent hiccups can exert on patients.

Recurrent thrombosis after carotid endarterectomy secondary to activated protein C resistance and essential thrombocytosis: A case report.

RATIONALE: Thrombosis is a major cause of morbidity in the perioperative period. Although many risk factors are known, activated protein C resistance is a prominent risk for thrombosis. Activated protein C resistance frequently occurs with recurrent thromboembolism. PATIENT CONCERNS: A 59-year-old Korean woman patient with hypertension was admitted due to dysarthria and left side motor weakness. DIAGNOSIS AND INTERVENTIONS: Magnetic resonance imaging showed subacute cerebral infarction with right frontoparietal lobe and stenosis at the right internal carotid artery. She underwent right carotid endarterectomy under general anesthesia. However, recurrent thrombosis on postoperative day 1 was noted at patient's right carotid artery, which prompted emergency surgery. Additional preoperative laboratory review revealed findings for activated protein C resistance, low protein S activity, antinuclear antibody (>1:160), anti-cardiolipin IgM antibody (16.6), and thrombocytosis, Janus kinase and factor V Leiden mutations. At the intensive care unit, heparin was continually infused until postoperative day 12 and was then switched to warfarin. OUTCOMES: Patient was discharged at postoperative day 21 without any event. Patient had no signs of recurrence within the 3-year follow-up period, and she is still on oral warfarin and clopidogrel. LESSONS: Screening test for hypercoagulability can be used to identify patients at higher risk of postoperative complications. If hypercoagulability state is confirmed by laboratory testing, a suitable anticoagulant treatment plan should be made within the perioperative period.

Use of stellate ganglion block for treatment of recurrent syncope followed by chest pain.

Syncope is defined as a transient loss of consciousness and postural tone, characterized by rapid onset, short duration, and spontaneous recovery. Stellate ganglion block (SGB) is a nerve block method that is used for treatment of neuropathic pain in the head, neck and upper extremities, especially trigeminal neuralgia, postherpetic neuralgia and complex regional pain syndrome. SGB can modulate and stabilize the sympathetic nervous system, which prevents it from overexcitation and improves symptoms of syncope. The authors report a patient who was treated for pain and edema of both upper extremities with SGB, then showed improvement in recurrent syncope followed by chest pain and overall quality of life.

Epinephrine-induced lactic acidosis in orthognathic surgery: a report of two cases.

Submucosal infiltration and the topical application of epinephrine as a vasoconstrictor produce excellent hemostasis during surgery. The hemodynamic effects of epinephrine have been documented in numerous studies. However, its metabolic effects (especially during surgery) have been seldom recognized clinically. We report two cases of significant metabolic effects (including lactic acidosis and hyperglycemia) as well as hemodynamic effects in healthy patients undergoing orthognathic surgery with general anesthesia. Epinephrine can induce glycolysis and pyruvate generation, which result in lactic acidosis, via ß2-adrenergic receptors. Therefore, careful perioperative observation for changes in plasma lactate and glucose levels along with intensive monitoring of vital signs should be carried out when epinephrine is excessively used as a vasoconstrictor during surgery.