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Against the traditional view, a recently published theory argued that isotope ratios are higher in convective precipitation but lower in stratiform precipitation and proposed that isotope ratios reflect rain type proportions. This theory has been widely cited despite some early reservations. Whether the theory represents a faithful reflection of signals of water isotope ratios remains unclear. Here, we reassess its validity from different timescales and broader observations from the pantropics. Unexpectedly, our findings contradict the theory on daily, monthly, and even annual timescales. Pantropical precipitation isotope ratios remain strongly correlated to convection intensity but are independent of rain type proportions because stratiform precipitation isotope ratios cover a large range of values. We find that the theory has many serious weaknesses related to preferential data selection and suggest that new theories need to be validated at more locations on different timescales before gaining widespread acceptance.

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OBJECTIVE: To evaluate the effectiveness of autologous costal cartilage-based open rhinoplasty in the correction of secondary unilateral cleft lip nasal deformity. METHODS: Between January 2013 and June 2020, 30 patients with secondary unilateral cleft lip nasal deformity were treated, including 13 males and 17 females; aged 14-41 years, with an average of 21.7 years. Among them, 18 cases were cleft lip, 9 cases were cleft lip and palate, and 3 cases were cleft lip and palate with cleft alveolar. The autologous costal cartilage-based open rhinoplasty was used for the treatment, and the alar annular graft was used to correct the collapsed alar of the affected side. Before operation and at 6-12 months after operation, photos were taken in the anteroposterior position, nasal base position, oblique position, and left and right lateral positions, and the following indicators were measured: rhinofacial angle, nasolabial angle, deviation angle of central axis of columella, nostril height to width ratio, and bilateral nasal symmetry index (including nostril height, nostril width, and nostril height to width ratio). RESULTS: The incisions healed by first intention after operation, and no complications such as acute infection occurred. All 30 patients were followed up 6 months to 2 years, with an average of 15.2 months. During the follow-up, the patients' nasal shape remained good, the tip of the nose and columella were basically centered, the back of the nose was raised, the collapse of the affected side of nasal alar and the movement of the feet outside the nasal alar were all lessened than preoperatively. The basement was elevated compared to the front, and no cartilage was exposed or infection occurred. None of the patients had obvious cartilage absorption and recurrence of drooping nose. Except for the bilateral nostril width symmetry index before and after operation, there was no significant difference ( t=1.950, P=0.061), the other indexes were significantly improved after operation when compared with preoperatively ( P<0.05). Eleven patients (36.7%) requested revision operation, and the results were satisfactory after revision. The rest of the patients' nasal deformities were greatly improved at one time, and they were satisfied with the effectiveness. CONCLUSION: Autologous costal cartilage-based open rhinoplasty with the alar annular graft is a safe and effective treatment for secondary unilateral cleft lip nasal deformity.

Assuntos

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OBJECTIVE: To explore the clinical application and effectiveness of a personalized tissue engineered cartilage with seed cells derived from ear or nasal septal cartilage and poly-glycolic acid (PGA)/poly-lactic acid (PLA) as scaffold in patients with nasal reconstruction. METHODS: Between March 2014 and October 2015, 4 cases of acquired nasal defects and 1 case of congenital nasal deformity were admitted. The patient with congenital nasal deformity was a 4-year-old boy, and the source of seed cells was nasal septal cartilage. The other 4 patients were 3 males and 1 female, aged 24-33 years, with an average of 28.5 years. They all had multiple nasal subunit defects caused by trauma and the source of seed cells was auricular cartilage. The tissue engineered cartilage framework was constructed in the shape of normal human nasal alar cartilage and L-shaped silicone prosthesis with seed cells from cartilage and PGA-PLA compound biodegradable scaffold. The boy underwent nasal deformity correction and silicone prosthesis implantation in the first stage, and the prosthesis was removed and implanted with tissue engineered cartilage in the second stage; the remaining 4 adult patients all used expanded forehead flaps for nasal reconstruction. All 5 patients underwent 1-4 nasal revisions. The implanted tissue engineered cartilage was observed during the operation and taken from 2 patients for histological examination. RESULTS: All the incisions healed by first intention after the tissue engineered cartilage implantation, and the expanded forehead flaps survived. Postoperative low fever occurred in 3 patients. No complications such as infection, obvious immune rejection response, and tissue engineered cartilage protrusion were found in all patients. All patients were followed up 9-74 months (mean，54.8 months). During follow-up, the patients had no obvious discomfort in the nose and the ventilation function were good. All patients were satisfied with the nasal contour. Early-stage histological examination showed the typical cartilage characteristics in 1 patient after the implantation of tissue engineered cartilage. Late-stage histological examination in 1 patient of tissue engineered cartilage showed the characteristics of fibrous connective tissue; and the other showed there was remaining cartilage. CONCLUSION: The safety of tissue engineered cartilage constructed in vitro for reconstruction is preliminarily confirmed, but the effectiveness still needs further verification.

Assuntos

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OBJECTIVE: To retrospectively evaluate the effectiveness of Botulinum Toxin Type A (BTX-A) injections relieve pain in the field of plastic surgery and postoperative rehabilitation, and discuss the analgesic mechanism of BTX- A in plastics and related research progress. METHODS: From appearance to September 1, 2016, PUBMED, EMBASE, and Web of Science were searched, using the key words related to "Botulinum Toxin Type A" and "Pain." Furtherly, nonplastic surgery-related literature was excluded by manual screening. RESULTS: Eleven literatures met the inclusion criteria, including 6 prospective controlled cohorts, 4 patient series, and 1 retrospective cohort. These studies involved Lower Limb, Breast, Hallux, Amputees, and Temporomandibular joint disk disfigurement and enrolled 402 patients. Among the patients, 360 received intraoperative BTX-A injection at the time of the main surgical procedure, 16 injected postoperatively and 26 did not undergo surgery. And 85.32% reported pain alleviation and 69.96% got favorable side effects and no one occurred major adverse effects. But 1.83% accepted injections more than once. Mechanism analysis explained these studies' results and demonstrated the analgesic effectiveness of BTX-A in plastics with nociceptive pain, inflammatory pain, and neuropathic pain. CONCLUSION: The results suggest that BTX-A may induce postoperative pain associated with plastic surgeries relief. But the available data of outcome assessment involved in this review are inconsistent and failed to meet methodological rigor. And pain alleviations are influenced by many factors. So further randomized controlled clinical trials with large sample sizes are needed to support this practice, determine standard usage methods, and establish corresponding specification systems.

Assuntos