:
The restoration of large full-thickness lip defects still remains a formidable challenge for the reconstructive surgeons. Traumatic injuries, infections and tumors (primarily squamous cell carcinoma) are the most common source of the lip defects. Lower lips are more important in providing oral competence, unfortunately throughout the life-time they are significantly more exposed to ultraviolet radiation and thus are the most common site for the lip cancers (89%). This type of defect requires a complex reconstruction of an adequate sphincter function, defined vermilion, proper oral lining and sufficient mouth opening. To maintain the oral competence, it is of paramount importance to restore the function of orbicularis oris, which principally composes the body of the lip. Currently, the dynamic reconstructions are gaining considerable interest. They enables not only improvement of appearance but also a restoration of function and preservation of health-related quality of life. The use of the free gracilis muscle transfer to reconstruct the lower lip and its dynamic character in contrast to other, static reconstructions can provide the sufficient movement of the lower lip, which does not depend on function of other mimic muscles as it becomes an independent motor unit with its own neurotization. In our opinion the free functioning gracilis muscle flap, due to its anatomic and functional features as well as low-rate donor-site morbidity is the worth considering option for a lower lip reconstruction.
For many decades palliation (radiotherapy, chemotherapy or symptomatic treatment) was the only therapeutic solution for locally very advanced head and neck cancer. In the mid 70s, H. Buncke carried out pioneering microvascular reconstructive surgery (MRS) as a radical treatment. Since that time, the MRS has been accepted around the world as a successful radical therapy, not only for head and neck (H&N) cancers. A part of the H&N cancers need however post--MRS radiotherapy (RT). Based on the 20 year experience of the Institute of Oncology in Gliwice with MRS (about 2500 patients), D. Bula has defined local recurrence risk factors. Dutch studies convincingly documented the prognostic value of the estimated molecular profiles of the resected margins as additional risk factors. The use of conventional 2.0 Gy/ fraction post-MRS-RT result in a high risk of the inserted reconstructive flap necrosis or rejection. Therefore, a novel IMRT--VMAT technique with 50 Gy given in 1.5-1.6 Gy/fraction has been designed which allows to almost eliminate the flap from the irradiated volume and therefore minimizes recurrence and/or flap rejection to almost zero. The present paper shows objectively selected a cluster of patients being the candidate to post-MRS safe and effective VMAT radiotherapy.
The multifaceted nature of subarachnoid hemorrhage (SAH) pathogenesis is poorly understood. To date, no pharmacological agent has been found to be efficacious for the prevention of brain injury when used for acute SAH intervention. This study was undertaken to evaluate the beneficial effects of low-dose neuroprotective agent minocycline on brain microvascular ultrastructures that have not been studied in detail. We studied SAH brain injury using an in vivo prechiasmatic subarachnoid hemorrhage rodent model. We analyzed the qualitative and quantitative ultrastructural morphology of capillaries and surrounding neuropil in the rodent brains with SAH and/or minocycline administration. Here, we report that low-dose minocycline (1 mg/kg) displayed protective effects on capillaries and surrounding cells from significant SAH-induced changes. Ultrastructural morphology analysis revealed also that minocycline stopped endothelial cells from abnormal production of vacuoles and vesicles that compromise blood–brain barrier (BBB) transcellular transport. The reported ultrastructural abnormalities as well as neuroprotective effects of minocycline during SAH were not directly mediated by inhibition of MMP-2, MMP-9, or EMMPRIN. However, SAH brain tissue treated with minocycline was protected from development of other morphological features associated with oxidative stress and the presence of immune cells in the perivascular space. These data advance the knowledge on the effect of SAH on brain tissue ultrastructure in an SAH rodent model and the neuroprotective effect of minocycline when administered in low doses.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.