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Dive into the research topics where Krishna S. Vyas is active.

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Featured researches published by Krishna S. Vyas.


Plastic and Reconstructive Surgery | 2016

Phalloplasty: A Review of Techniques and Outcomes.

Shane D. Morrison; Afaaf Shakir; Krishna S. Vyas; Johanna Kirby; Curtis N. Crane; Gordon K. Lee

Background: Acquired or congenital absence of the penis can lead to severe physical limitations and psychological outcomes. Phallic reconstruction can restore various functional aspects of the penis and reduce psychosocial sequelae. Moreover, some female-to-male transsexuals desire creation of a phallus as part of their gender transition. Because of the complexity of phalloplasty, there is not an ideal technique for every patient. This review sets out to identify and critically appraise the current literature on phalloplasty techniques and outcomes. Methods: A comprehensive literature search of the MEDLINE, PubMed, and Google Scholar databases was conducted for studies published through July of 2015 with multiple search terms related to phalloplasty. Data on techniques, outcomes, complications, and patient satisfaction were collected. Results: A total of 248 articles were selected and reviewed from the 790 identified. Articles covered a variety of techniques on phalloplasty. Three thousand two hundred thirty-eight patients underwent phalloplasty, with a total of 1753 complications reported, although many articles did not explicitly comment on complications. One hundred four patients underwent penile replantation and two underwent penile transplantation. Satisfaction was high, although most studies did not use validated or quantified approaches to address satisfaction. Conclusions: Phalloplasty techniques are evolving to include a number of different flaps, and most techniques have high reported satisfaction rates. Penile replantation and transplantation are also options for amputation or loss of phallus. Further studies are required to better compare different techniques to more robustly establish best practices. However, based on these studies, it appears that phalloplasty is highly efficacious and beneficial to patients.


Healthcare | 2014

Wound Healing: Biologics, Skin Substitutes, Biomembranes and Scaffolds

Krishna S. Vyas; Henry C. Vasconez

This review will explore the latest advancements spanning several facets of wound healing, including biologics, skin substitutes, biomembranes and scaffolds.


Plastic and Reconstructive Surgery | 2016

Facial Feminization: Systematic Review of the Literature

Shane D. Morrison; Krishna S. Vyas; Saba Motakef; Katherine M. Gast; Michael T. Chung; Vania Rashidi; Thomas Satterwhite; William M. Kuzon; Paul S. Cederna

Background: Facial feminization surgery encompasses a broad range of craniomaxillofacial surgical procedures designed to change masculine facial features into feminine features. The surgical principles of facial feminization surgery can be applied to male-to-female transsexuals and anyone desiring feminization of the face. Although the prevalence of these procedures is difficult to quantify, because of the rising prevalence of transgenderism (approximately one in 14,000 men) along with improved insurance coverage for gender-confirming surgery, surgeons versed in techniques, outcomes, and challenges of facial feminization surgery are needed. This review is designed to critically appraise the current facial feminization surgery literature. Methods: A comprehensive literature search of the Medline, PubMed, and EMBASE databases was conducted for studies published through October of 2014 with multiple search terms related to facial feminization. Data on techniques, outcomes, complications, and patient satisfaction were collected. Results: Fifteen articles were selected and reviewed from the 24 identified, all of which were either retrospective or case series/reports. Articles covered a variety of facial feminization procedures. A total of 1121 patients underwent facial feminization surgery, with seven complications reported, although many articles did not explicitly comment on complications. Satisfaction was high, although most studies did not use validated or quantified approaches to address satisfaction. Conclusions: Facial feminization surgery appears to be safe and satisfactory for patients. Further studies are required to better compare different techniques to more robustly establish best practices. Prospective studies and patient-reported outcomes are needed to establish quality-of-life outcomes for patients. However, based on these studies, it appears that facial feminization surgery is highly efficacious and beneficial to patients.


Plastic and Reconstructive Surgery | 2016

What Makes a Plastic Surgery Residency Program Attractive? An Applicant's Perspective.

David Atashroo; Anna Luan; Krishna S. Vyas; Elizabeth R. Zielins; Zeshaan N. Maan; Dominik Duscher; Graham G. Walmsley; Michael P. Lynch; Daniel L. Davenport; Derrick C. Wan; Michael T. Longaker; Henry C. Vasconez

Background: Plastic surgery is among the most competitive specialties in medicine, but little is known about the attributes of programs that are most attractive to successful applicants. This study aimed to understand and provide insights regarding program characteristics that are most influential to students when ranking plastic surgery programs. Methods: An anonymous online survey was conducted with newly matched plastic surgery residents for the integrated and combined Match in 2012 and 2013. Subjects were queried regarding their demographics, qualifications, application experiences, and motivations for residency program selection. Results: A total of 92 of 245 matched plastic surgery residents (38 percent) responded to the survey. The perception of resident happiness was the most positive factor influencing program ranking, followed by high operative volume, faculty mentorship, and strong research infrastructure. Perception of a program as “malignant” was the most negative attribute. Applicants with Step 1 scores greater than 245 received significantly more interviews (p =0.001) and considered resident benefits less important (p < 0.05), but geographic location more important (p =0.005). Applicants who published more than two articles also received more interviews (p =0.001) and ranked a strong research infrastructure and program reputation as significantly more important (p < 0.05). Forty-two percent of applicants completed an away rotation at the program with which they matched, and these applicants were more likely to match at their number one ranked program (p = 0.001). Conclusions: Plastic surgery applicants have differing preferences regarding the ideal training program, but some attributes resonate. These trends can guide programs for improvement in attracting the best applicants.


Clinics in Plastic Surgery | 2014

Clinical Applications of Autografts, Conduits, and Allografts in Repair of Nerve Defects in the Hand: Current Guidelines

Brian Rinker; Krishna S. Vyas

Traumatic nerve injuries are common conditions treated by hand surgeons, and the optimal treatment of a severed nerve requires providing a healthy wound bed, generous trimming to healthy nerve substance, and a minimal-tension approximation. The gold standard for repair of a critical nerve gap has been the nerve autograft. However, results are generally less favorable than direct suture. Autogenous and synthetic conduits and processed nerve allografts have been developed as less morbid and more convenient alternatives to autografts, but the reported outcomes have been uneven. Engineered neural tissues show great promise in inducing nerve regeneration across a gap.


Plastic and Reconstructive Surgery | 2016

Systematic Review of Liposomal Bupivacaine (Exparel) for Postoperative Analgesia

Krishna S. Vyas; Sibi Rajendran; Shane D. Morrison; Afaaf Shakir; Samir Mardini; Valerie Lemaine; Maurice Y. Nahabedian; Stephen B. Baker; Brian Rinker; Henry C. Vasconez

Background: Management of postoperative pain often requires multimodal approaches. Suboptimal dosages of current therapies can leave patients experiencing periods of insufficient analgesia, often requiring rescue therapy. With absence of a validated and standardized approach to pain management, further refinement of treatment protocols and targeted therapeutics is needed. Liposomal bupivacaine (Exparel) is a longer acting form of traditional bupivacaine that delivers the drug by means of a multivesicular liposomal system. The effectiveness of liposomal bupivacaine has not been systematically analyzed relative to conventional treatments in plastic surgery. Methods: A comprehensive literature search of the MEDLINE, PubMed, and Google Scholar databases was conducted for studies published through October of 2015 with search terms related to liposomal bupivacaine and filtered for relevance to postoperative pain control in plastic surgery. Data on techniques, outcomes, complications, and patient satisfaction were collected. Results: A total of eight articles were selected and reviewed from 160 identified. Articles covered a variety of techniques using liposomal bupivacaine for postoperative pain management. Four hundred five patients underwent procedures (including breast reconstruction, augmentation mammaplasty, abdominal wall reconstruction, mastectomy, and abdominoplasty) where pain was managed with liposomal bupivacaine and compared with those receiving traditional pain management. Liposomal bupivacaine use showed adequate safety and tolerability and, compared to traditional protocols, was equivalent or more effective in postoperative pain management. Conclusion: Liposomal bupivacaine is a safe method for postoperative pain control in the setting of plastic surgery and may represent an alternative to more invasive pain management systems such as patient-controlled analgesia, epidurals, peripheral nerve catheters, or intravenous narcotics.


Expert Opinion on Biological Therapy | 2013

Comparison of hemostatic agents used in vascular surgery

Krishna S. Vyas; Sibu P. Saha

Introduction: Over the past 15 years, a wide range of agents have been developed for use in surgical procedures to achieve hemostasis. These agents can be divided into three broad categories: hemostats, sealants and adhesives. They vary widely related to their mechanism of action, composition, ease of application, adherence to wet or dry tissue, immunogenicity and cost. Areas covered: This article focuses on the agents used in vascular surgery to achieve hemostasis; agents involved in clinical trials are also covered. Expert opinion: When surgeons achieve rapid hemostasis, potential benefits include better visualization of the surgical area, shorter operative times, decreased requirement for transfusions, better management of an anticoagulated patient, decreased wound healing time and overall improvement in patient recovery time. The need for safe and efficacious hemostatic agents that can provide a range of benefits is clearly a significant surgical issue.


Journal of Reconstructive Microsurgery | 2016

Penile Replantation: A Retrospective Analysis of Outcomes and Complications

Shane D. Morrison; Afaaf Shakir; Krishna S. Vyas; Austin C. Remington; Benjamin Mogni; Stelios C. Wilson; David W. Grant; Daniel Y. Cho; Amir A. Rahnemai-Azar; Gordon K. Lee; Jeffrey B. Friedrich; Samir Mardini

Purpose Penile replantation is an uncommonly performed procedure, which can alleviate physical and psychosocial sequelae of penile amputation. This study critically appraises the current literature on penile replantation. Methods A comprehensive literature search of the Medline, PubMed, and Google Scholar databases was conducted with multiple search terms related to penile replantation. Data on outcomes, complications, and patient satisfaction were collected. Results A total of 74 articles met inclusion criteria. One hundred and six patients underwent penile replantation, but outcome, complication, and satisfaction data were not standardized across all patients. Penile amputation most often resulted from self‐mutilation or trauma. The majority were complete amputations (74.8%). Full sensation was maintained in 68.4% of patients. Most reported adequate urinary function (97.4%) and normal erection (77.5%). Skin necrosis (54.8%) and venous congestion (20.2%) were the most common complications. Urethral stricture (11.0%) and fistula (6.6%) were common urethral complications. Most (91.6%) patients reported overall satisfaction although there was a lack of patient‐reported outcomes. Multivariate analysis suggested that complete amputation (&bgr; = 3.15, 95% CI 0.41‐5.89, p = 0.024), anastomosis of the superficial dorsal artery (&bgr; = 9.88, 95% CI 0.74‐19.02, p = 0.034), and increasing number of nerves coapted (&bgr; = 1.75, 95% CI 0.11‐3.38, p = 0.036) were associated with favorable sexual, urinary, and sensation outcomes. Increasing number of vessels anastomosed (&bgr; = ‐3.74, 95% CI ‐7.15 to ‐0.32, p = 0.032) was associated with unfavorable outcomes. Conclusion Although penile replantation is associated with complications, it has a high rate of satisfaction and efficacy. Coaptation of multiple nerves and anastomosis of the superficial dorsal artery should be completed.


Southern Medical Journal | 2013

Mediastinoscopy: Trends and Practice Patterns in the United States

Krishna S. Vyas; Daniel L. Davenport; Victor A. Ferraris; Sibu P. Saha

Objectives Historically, mediastinoscopy has been the gold standard for the staging of lung cancer. A practice gap exists as the result of a variation in knowledge concerning current trends and practice patterns of mediastinoscopy usage. In addition, there are regional variations in practice-based learning and patient care. Lessons learned during surgeries performed on patients with lung cancer and other advances such as positron emission tomography and endobronchial ultrasound could be universally applied to improve surgeons’ management of patient care. The purpose of this study was to assess contemporary practices in the staging of lung cancer. Methods We queried the Society of Thoracic Surgeons National Database for data regarding mediastinoscopy usage, yield, and variation, both by year and region. Results Cases with mediastinoscopy, as a percentage of all cases performed in the database, have significantly decreased from 14.6% in 2006 to 11.4% in 2010 (P < 0.001). The 5-year median rate of mediastinoscopy in lung cancer patients at 163 centers was 15.3% (interquartile range 5.2%–31.7%), indicating significant variation among centers. The overall median center rate also decreased over time from 21.4% (2006) to 10.0% (2010). Conclusions With advances in minimally invasive procedures and imaging, mediastinoscopy usage has declined significantly. Our findings are likely to be relevant to both clinical practice and practice guidelines.


Annals of Plastic Surgery | 2017

A Systematic Review of the Use of Telemedicine in Plastic and Reconstructive Surgery and Dermatology.

Krishna S. Vyas; H. Rhodes Hambrick; Afaaf Shakir; Shane D. Morrison; Duy Cong Tran; Keon Pearson; Henry C. Vasconez; Samir Mardini; Amanda A. Gosman; Marek Dobke; Mark S. Granick

Background Telemedicine, the use of information technology and telecommunication to provide healthcare at a distance, is a burgeoning field with applications throughout medicine. Given the visual nature of plastic surgery and dermatology, telemedicine has a myriad of potential applications within the field. Methods A comprehensive literature review of articles published on telemedicine since January 2010 was performed. Articles were selected for their relevance to plastic and reconstructive surgery and dermatology, and then reviewed for their discussion of the applications, benefits, and limitations of telemedicine in practice. Results A total of 3119 articles were identified in the initial query. Twenty-three articles met the inclusion criteria in plastic surgery (7 wound management, 5 burn management, 5 trauma, 4 free flap care, 2 in cleft lip/palate repair). Twenty-three (100%) reported a benefit of telemedicine often related to improved postoperative monitoring, increased access to expertise in rural settings, and cost savings, either predicted or actualized. Eight (35%) reported limitations and barriers to the application of telemedicine, including overdiagnosis and dependence on functional telecommunication systems. Sixty-six articles focused on telemedicine in dermatology and also demonstrated significant promise. Conclusions Telemedicine holds special promise in increasing the efficiency of postoperative care for microsurgical procedures, improving care coordination and management of burn wounds, facilitating interprofessional collaboration across time and space, eliminating a significant number of unnecessary referrals, and connecting patients located far from major medical centers with professional expertise without impinging on—and in some cases improving—the quality or accuracy of care provided. Teledermatology consultation was found to be safe and has a comparable or superior efficacy to the traditional in-patient consultation. The system was consistently rated as convenient and easy to use by patients, referring physicians, and consulting dermatologists. Teledermatology has also been used as an educational tool for patients. A significant number of studies detailed strategies to improve the current state of teledermatology, either by implementing new programs or improving technologies. Telemedicine use is widespread among plastic surgeons and is enabling the spread of expertise beyond major medical centers. Further research is needed to conclusively demonstrate benefit in routine clinical care.

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Marek Dobke

University of California

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