United States

Background
Aortic stenosis (AS) etiologies include degenerative calcific change, bicuspid aortic valve, and systolic dysfunction. Left ventricular systolic dysfunction decreases blood flow across the aortic valve. There are limited data on low-flow aortic stenosis (stroke volume index (SVI) &lt; 35 mL/m2) following aortic valve replacement (AVR) in patients with systolic dysfunction (LVEF &lt; 50%). We hypothesized that patients with low-flow aortic stenosis and systolic dysfunction perform poorly after AVR compared to those patients with normal flow (SVI ≥ 35 mL/m2) and systolic dysfunction.

Methods
We reviewed AVR cases at a high-volume structural heart center in western New York from 2012 to 2017. Of the 120 patients, 70 patients had low flow aortic stenosis. Stroke volume index was calculated at the level of the left ventricular outflow tract from the transthoracic echocardiographic examination prior to AVR. We performed Receiver operator characteristics and Cox regression analyses to examine the accuracy of the SVI model in predicting the postoperative outcome of the patients undergoing AVR procedure with existing left ventricular dysfunction.

Results
Both five-year survival and overall mortality following AVR were decreased in patients with low flow aortic stenosis. 63% of patients with low-flow aortic stenosis compared to 30% with normal flow aortic stenosis were deceased five years post-AVR. ROC curve indicated SVI to be a clinical predictor of both 5 year (AUC .732, 95% CI: 0.641 - 0.823, p &lt; 0.001) and overall mortality (AUC .728, 95% CI: 0.633 - 0.823, p &lt; 0.001). A comparison of survivors and non-survivors showed that diabetes with an odds ratio of 3.18 [1.45-6.99]; (p = 0.005) and low-flow stroke volume with an odds ratio of 4.44 (2.05-9.66); (p &lt; 0.001) were significant clinical risk factors for patient mortality. 

Conclusion
Patients with low flow aortic stenosis and systolic dysfunction had decreased 5-year survival rates and increased overall mortality post-AVR. This highlights the importance of monitoring blood flow across the aortic valve prior to AVR. Diabetes and low flow stroke volume were notable risk factors for patient mortality. Additional studies are in progress to assess other clinical predictors like energy loss index for patient mortality following AVR. 


AMA Research Challenge 2022

Stroke Volume Index Predicts Mortality Following Aortic Valve Replacement

The OWSD General Assembly and international conference will be held entirely online for the first time in OWSD's 28-year history, allowing as many of OWSD's 7600+ members to participate as possible.

The conference theme is 'Women, science and development', exploring three areas of relevance: 1) the importance of basic sciences for development; 2) the impact of applied sciences on development and 3) including sex and gender as variables in scientific research.


**Keynote speakers include:** 
* Fabiola Gianotti, Director-General of CERN; 
* Bina Agarwal, an internationally celebrated economist specializing in the political economy of gender, poverty and inequality; and 
* Angela Saini, award-winning author of Inferior: How Science Got Women Wrong and the New Research That’s Rewriting the Story, Superior: The Return of Race Science, and other books. 

OWSD members will present their own research in the three themes during poster sessions throughout the conference. In addition, members will also present their own scientific and personal responses to the COVID-19 pandemic. All members will also have the opportunity to take part in a workshop on increasing their visibility and impact as a scientist, with a session on using podcasts for storytelling by Joy Owango and Adelle Onyango of the Training Centre in Communication (TCC Africa), followed by a session on filmmaking for impact by Nicole Leghissa, OWSD video consultant.

The conference will include a handover of the previous OWSD Executive Board to the new members, elected in June-July 2021. On the last day of the conference (19 November), the OWSD Italy Country Network will be launched. **This will be an in-person event in Trieste.** Italian government representatives and donors are invited to attend. The Trieste event will be coordinated with similar in person events being held in OWSD countries throughout the developing world and streamed online. At least 2,000 OWSD members, women scientists from developing countries around the world, are expected to participate online in the General Assembly and conference.

 

**ABOUT THE PROGRAMME**

In order to approach the complex and wide-ranging challenges of the 2030 Agenda for Sustainable Development, societies around the world must access and harness all the talent and experience available to them. The concerns and perceptions of the greatest number of all possible actors and recipients must be considered in order that the most relevant issues and effective solutions are found. Women are considerably underrepresented as researchers in STEM subjects around the globe; according to UNESCO Institute of Statistics (UIS) data, in 2019 the global average percentage of women researchers was still below 30%. Yet women typically have first hand specialist knowledge of the day-to-day challenges diverse individuals face within communities, and can be key informers in the design and development of their solutions. Moreover, since women are most often the providers of informal community support, if they are not fully informed—and if solutions are developed without their consultation—it may be the case that products, services and solutions are not relevant or appropriate. Technological advances may mean improved machines on large farms, for example, potentially increasing food production, but since the key points of food insecurity in the world are on small-scale farms managed by women throughout the Global South, such capital investments will have little impact in the areas where food production is most critical—and where women’s knowledgeable implementation of appropriate innovative technologies could make the most difference.

 
 


**Keynote Speakers:**
* Fabiola Gianotti, Director-General of CERN; 
* Bina Agarwal, an internationally celebrated economist specializing in the political economy of gender, poverty and inequality; and 
* Angela Saini, award-winning author of Inferior: How Science Got Women Wrong and the New Research That’s Rewriting the Story, Superior: The Return of Race Science, and other books. 

**Eminent Guests:**
* Elena Bonetti, Italian Minister for Family and Equal Opportunities
* Maria Cristina Messa,	Italian Minister of Universities and Research
* Shamila Nair-Bedouelle,	Assistant Director General for Natural Sciences, UNESCO
* Maria Chiara Carrozza,	President, National Research Council of Italy
* Kerstin Jonsson Cisse,	Head of Unit for Globally Sustainable Economic Development, Sida - Sweden
* Naser Faruqui,	Director of Education and Science at IDRC - Canada
* Ylann Schemm,	Director, Elsevier Foundation
* Alberto Quadrio Curzio,	President Emeritus of the Italian Academy of Sciences and Humanities 
* Mohamed Hassan,	President, TWAS the World Academy of Sciences

**Chairs, panelists, interviewers and other speakers:**
Jennifer Thomson, Tonya Blowers, Rana Dajani, Shobhana Narasimhan, Joy Owango, Elizabeth Pollitzer, Kausila Timsina, Elizabeth Bandason, Susana Arrechea, Reinabelle Reyes, Dorine Odongo, Elizabeth Pollitzer, Adelle Onyango, Nicole Leghissa, Jana Rodriguez Hertz, Maryse Nkoua Ngavouka, Kate Shaw, Chao Mbogo, Prativa Pandey, Edna Patricia Matta-Camacho, Amira Shaheen, Wezi Nyambili, Ana Lucía Martinez Abarca, Mashura Shammi, Therese Umuhoza, Dionica Gamboa, Marian Nkansah, Babalola Olubukola Oluranti, Esi Awuah, Fortunate Farirai, Atya Kapley, Hasin Anupama Azhari, Huda Basaleem, Nashwa Eassa, Shymaa Enany, Kleinsy Bonilla, Patricia Castillo-Briceno, Fang Xin

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OWSD 6th GENERAL ASSEMBLY AND INTERNATIONAL CONFERENCE

The conference theme is 'Women, science and development', exploring three areas of relevance: the importance of basic sciences for development; the impact of applied sciences on development, and including sex and gender as variables in scientific research.

Background
Aortic stenosis (AS) etiologies include degenerative calcific change, bicuspid aortic valve, and systolic dysfunction. Left ventricular systolic dysfunction decreases blood flow across the aortic valve. There are limited data on low-flow aortic stenosis (stroke volume index (SVI) < 35 mL/m2) following aortic valve replacement (AVR) in patients with systolic dysfunction (LVEF < 50%). We hypothesized that patients with low-flow aortic stenosis and systolic dysfunction perform poorly after AVR compared to those patients with normal flow (SVI ≥ 35 mL/m2) and systolic dysfunction.

Methods
We reviewed AVR cases at a high-volume structural heart center in western New York from 2012 to 2017. Of the 120 patients, 70 patients had low flow aortic stenosis. Stroke volume index was calculated at the level of the left ventricular outflow tract from the transthoracic echocardiographic examination prior to AVR. We performed Receiver operator characteristics and Cox regression analyses to examine the accuracy of the SVI model in predicting the postoperative outcome of the patients undergoing AVR procedure with existing left ventricular dysfunction.

Results
Both five-year survival and overall mortality following AVR were decreased in patients with low flow aortic stenosis. 63% of patients with low-flow aortic stenosis compared to 30% with normal flow aortic stenosis were deceased five years post-AVR. ROC curve indicated SVI to be a clinical predictor of both 5 year (AUC .732, 95% CI: 0.641 - 0.823, p < 0.001) and overall mortality (AUC .728, 95% CI: 0.633 - 0.823, p < 0.001). A comparison of survivors and non-survivors showed that diabetes with an odds ratio of 3.18 [1.45-6.99]; (p = 0.005) and low-flow stroke volume with an odds ratio of 4.44 (2.05-9.66); (p < 0.001) were significant clinical risk factors for patient mortality. 

Conclusion
Patients with low flow aortic stenosis and systolic dysfunction had decreased 5-year survival rates and increased overall mortality post-AVR. This highlights the importance of monitoring blood flow across the aortic valve prior to AVR. Diabetes and low flow stroke volume were notable risk factors for patient mortality. Additional studies are in progress to assess other clinical predictors like energy loss index for patient mortality following AVR.

poster

Welcome to the largest national, multi-specialty research event **featuring research from 750 medical students, residents and fellows, and international medical graduates.**


#### Event Details
The 2022 American Medical Association Research Challenge includes a poster symposium hall and a semifinals hall with the top scored research. Log in at any time throughout the event to:
* **View posters and presentations** on a variety of topics and specialties
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* **Connect with participants** and provide feedback to help advance their research

At the conclusion of this event, the AMA will announce the top five finalists who will advance to the AMA Research Challenge finals, present their research to an elite panel of judges and compete to win a $10,000 grand prize sponsored by Laurel Road.
 

#### Attend Live Forums
**Oct. 20, 6 — 7 p.m. Central**
 **How to plan a career in academic medicine** 
 Learn how to plan a career in academic medicine and get your questions answered. [Access Here](https://underline.io/events/363/lounge)
 
 **Speakers**
![](https://assets.underline.io/uploads/markdown_image/1/image/d5adb133dfc58eb0a6d469e9cedcd5d4.jpg)
Ricardo Correa, MD, EdD
![](https://assets.underline.io/uploads/markdown_image/1/image/5f9437ab87861538bf02b9ca7c0d926e.jpg)
Stuart M. Greenstein, MD
![](https://assets.underline.io/uploads/markdown_image/1/image/05b1b637c99286d558c371f8e8b185ce.jpg)
Stephanie Strohbeen, MD
 
 **Oct. 22, 11 a.m. — Noon Central**
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 **Speakers**
![](https://assets.underline.io/uploads/markdown_image/1/image/8ce6235e957d31cb5e6f9097cc6f6972.jpg)
Jessica Li, MD/PhD Candidate
![](https://assets.underline.io/uploads/markdown_image/1/image/9950ef2e0237f54cb3d8280334d42491.jpg)
Charles Lopresto, DO

### Sponsor
AMA would like to thank Laurel Road for sponsoring a $10,000 grand prize for the winner of the AMA Research Challenge. Laurel Road is not involved in the judging or scoring process to select the winner. The winner will be announced on Dec. 7 during the AMA Research Challenge finals. Payment of the grand prize will be directly from Laurel Road. See the AMA Research Challenge Official Rules for terms and conditions.

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Register to explore research in a variety of topics. AMA members get exclusive access to score posters in the semifinals.

**Please use the link below to register for free if you have not already done so:**

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Registration Is Required

Welcome to the largest national, multi-specialty research event featuring research from 750 medical students, residents and fellows, and international medical graduates.


Background
Hidradenitis suppurativa (HS) is a chronic, inflammatory skin condition of the follicular epithelium that impacts 1-4% of the population. HS presents clinically as recurrently inflamed nodules and sinus tracts, located in intertriginous areas of the body. The nodules can become infected and inflamed, leading to abscesses, pain, and scarring; all of which can have debilitating consequences on a patient’s quality of life. This study aims to improve HS outcomes by analyzing which pathogens are most frequently cultured based on lesion location and pathogen sensitivity profiles. These findings will allow physicians to tailor empiric antibiotic treatment based on HS lesion location. 

Methods
A retrospective medical chart review of patients who were seen at The University of Texas Medical Branch with a diagnosis of HS from 2006-2021 was conducted. 485 patients were seen over 600 patient visits from 2006-2021.

Results
Of the 485 patients seen with documented HS lesions, 75% were female and cultures were performed 47% of the time. Staphylococcus aureus was the most commonly cultured bacteria in general, and, was the most frequently cultured bacteria in the axilla, buttocks, and groin. Proteus mirabilis was the second most commonly cultured bacteria. P. mirabilis and Enterococcus spp. were the most common bacteria cultured in the inframammary region.

Sensitivity analysis of Staphylococcus aureus showed sensitivity to clindamycin in 70% of the cultures, rifampin in 93%, tetracycline in 89%, and trimethoprim-sulfamethoxazole (TMP/SMX) in 93%. A majority of Staphylococcus aureus was found to be resistant to erythromycin (59%) and oxacillin (55%). For P. mirabilis, ampicillin and levofloxacin were both found to be 100% sensitive. Lastly, Enterococcus spp. were found to be sensitive to ampicillin in 95% of the cultures.

Conclusion
The authors recommend TMP/SMX or tetracyclines as empiric therapy for axillary, buttocks and groin lesions. For only inframammary lesions, use of ampicillin should be strongly considered. For patients with multiple sites including the inframammary area, TMP/SMX should be used to ensure Gram (+) and Gram (–) coverage. Tetracyclines may be used as first line empiric therapy for multiple sites without inframammary involvement. 


An Updated Reference for Empiric Antibiotic Therapy in Hidradenitis Suppurativa

Background: Post-transplant lymphoproliferative disorder (PTLD) is a rare but deadly complication seen in patients after solid organ transplants as well as hematopoietic stem cell transplants. Current research suggests the underlying etiology of disease progression is likely secondary to a viral reactivation in the setting of immunosuppression such as the Epstein-Barr Virus (EBV). Cutaneous findings are rare but can range from ulcerated plaques to focal alopecia, with mycosis fungoides being the most frequent manifestation of the cutaneous T-cell lymphoma category. The objective of this study was to investigate the epidemiology and various clinical features of cutaneous manifestations of PTLD. 
Methods: A systematic review of published literature regarding cutaneous post-transplant lymphoproliferative disorders was conducted with inclusion of papers that reported individual patient characteristics and clinical courses. The prevalence of cutaneous PTLD for each specific transplantation was adjusted using the respective total transplantation rates conducted in the United States of America. 
Results: 82 cutaneous PTLD patients had a mean (SD) age at diagnosis of 50.9 (20.8) years, onset from transplant to disease presentation of 7.5 (5.8) years, and males comprised 74.4% of reported patients. When adjusted for total number of transplantation types, cutaneous manifestations of PTLD were most prevalent in renal transplants (77.9%) followed by HSCT (9.1%), liver (6.6%), and cardiac (5.1%). The most common areas of skin lesions were the lower extremities (33.8%), the trunk (18.8%), and the head and neck (11.3%). 
Conclusion: Renal transplant patients comprised the highest proportion of transplantations that developed cutaneous PTLD, which was surprising given cardiac transplant patients usually undergo more intense immunosuppressive regimens. Males appear to be predominantly affected, and the onset of cutaneous PTLD can range widely from shortly after transplantation to several years afterwards, emphasizing the important role clinicians have in being diligent within this patient population. Careful examination of cutaneous findings in these high-risk patients is especially important for timely diagnosis and therapeutic interventions, and further studies are needed to characterize the specific risk factors in cutaneous PTLD patients.

Clinical Characteristics of Post-Transplant Lymphoproliferative Disorder Involving the Skin

Venous leg ulcers, the most common leg ulcer, occur in patients with chronic venous
insufficiency due to venous hypertension. Evidence supports the conservative treatment with lower extremity compression, ideally within the range of 30-40 mm Hg. Pressures in this range provide enough force to partially collapse lower extremity veins without restricting arterial flow in patients in patients without peripheral arterial disease. There are many options for applying such compression, and those who apply these devices have varying levels of training and backgrounds. In this quality improvement study, a single observer utilized a reusable pressure monitor to compare pressures applied using different devices by individuals in wound clinics with diverse training from specialties of dermatology, podiatry, and general surgery. Average compression was higher in the dermatology wound clinic compared to the general surgery clinic (p=.004), and wraps applied by clinic staff were nearly twice as likely as a self-applied wrap to have pressures greater than 40 mm Hg (p = .03). Pressures were also dependent upon the specific compression device used (p=.008). These results indicate that the device-provided pressure may be dependent on both the compression device and on the background and training of the applicator. We propose that standardization in the training of compression application and increased use of a point of care pressure monitor may improve the consistency of applied compression, thus improving adherence to treatment and outcomes in patients with chronic venous insufficiency.

Consistent application of compression: an under-considered variable in the prevention of venous leg ulcers

HSCAPS-2: updated prediction score to distinguish hidradenitis suppurativa (HS) 
from site-specific cutaneous abscess

Background: Bullous pemphigoid (BP) is an autoimmune blistering skin disease that may cause significant morbidity and decreased quality of life. Current therapeutic options for patients with BP include systemic and topical corticosteroids, IVIG, and systemic immunosuppressants; however, side effects of these medications are often intolerable and there are few therapeutic options for patients with exclusionary comorbidities or recalcitrant BP. Dupilumab, an IL-4 receptor-alpha antagonist, has been identified as a potential therapeutic agent for BP. We aim to evaluate long-term outcomes, including response maintenance, treatment durability, and adverse events (AEs) of BP patients on dupilumab.

Methods: This is a retrospective case series from three academic medical centers that evaluates outcomes of 17 patients with biopsy-proven BP on dupilumab followed for >6 months.

Results: Ten males and seven females with an average age of 74.2 years were included in the study. The average dupilumab treatment duration was 19.6 months. On average, the patients tried and failed four standard therapies prior to starting dupilumab. In all patients, dupilumab was used as mono-systemic therapy and controlled the disease, with no losses of efficacy recorded. Fourteen patients were clear, two were almost clear, and one was significantly improved. There were no dupilumab-related AEs reported. Three of four patients who experienced treatment interruption had resultant flares; flares fully resolved with reinitiating of treatment. 

Conclusion: This study suggests promising long-term response and safety for BP patients on dupilumab, with all patients maintaining a response. Limitations of the study are that it involved a small number of patients, there was limited time patients were on treatment, and this not a controlled trial. More studies are needed to evaluate dupilumab which is a promising treatment for BP.

Long-term treatment outcomes and safety of dupilumab as a therapy for bullous pemphigoid: A multicenter retrospective review

Background

Perineural invasion is a pathologic process of neoplastic dissemination along and invading into the nerves. It is associated with aggressive disease and a greater likelihood of poor outcomes. Melanoma-associated genes (MAGEs) are CTAs expressed in various malignancies and have been widely studied as prognostic biomarkers. 

Methods

Total RNA was extracted from FFPE tissue samples and then processed using a custom probe set via the nCounter Analysis System (NanoString Technologies) as per company’s protocol. The raw quantification that resulted from the nCounter System’s barcode analysis was normalized using the nSolver software with relation to housekeeping genes.

Results

Three out of 9 patients with cutaneous squamous cell carcinoma and perineural invasion had poor clinical outcomes. Their tumors expressed high levels of MAGE-A3, a cancer testis antigen that may contribute to key processes of tumor development. The tumors also showed poor differentiation and deep invasion and thus were classified as Brigham and Women’s Hospital tumor stage 3. Cyclin E, A and B mRNA levels were increased in these tumors compared with normal skin tissues (102.93±15.03 vs. 27.15±4.59; 36.83±19.41 vs. 11.59±5.83; 343.77±86.49 vs. 95.65±29.25, respectively; p<0.05). A431 cutaneous squamous cell carcinoma cells pretreated with MAGE-A3 antibody showed a decreased percentage S-phase cells (14.13±2.8% vs. 33.97±1.1%; p<0.05) and reduced percentage closure in scratch assays (43.88±5.49% vs. 61.17±3.97%; p=0.0058). In a syngeneic animal model of squamous cell carcinoma, immunoblot showed overexpressed MAGE-A3 and cyclin E, A, and B in tumors in 6 weeks. However, knockout of MAGE-A3 expression caused a reduction in tumor growth (mean tumor volume 155.3 mm3 vs. 3.2 mm3).

Conclusion

These results suggest that MAGE-A3 is a key mediator in cancer progression. Moreover, elevated collagen XI and matrix metalloproteases 3, 10, 11, and 13 mRNA levels were observed in poorly differentiated cutaneous squamous cell carcinoma with perineural invasion comparing with normal skin tissues (1132.56±882.7 vs. 107.62±183.62; 1118.15±1109.49 vs. 9.5±5; 2603.87±2385.26 vs. 5.29±3; 957.95±627.14 vs. 400.42±967.66; 1149.13±832.18 vs. 19.41±35.62, respectively; p<0.05). In summary, this study highlights the potential prognostic value of MAGE-A3 in clinical outcomes of patients with cutaneous squamous cell carcinoma.

MAGE-A3 and Clinical Outcome in Cutaneous Squamous Cell Carcinoma with Perineural Invasion

Background
Mohs micrographic surgery (MMS) may be an effective treatment modality for oral cavity cancers (OCC) due to possibility of more effective visualization of tumor margins, and greater preservation of benign tissue. The objective of this study is to review the existing literature on the use of MMS for the treatment of OCC, and categorize its uses and limitations. 
Methods
Systematic review was conducted in accordance with AMSTAR (Assessing the Methodological Quality of Systematic Reviews) guidelines Database search of English, Spanish, and Portuguese articles in PubMed, Scopus, and Google Scholar from inception of databases to June 2, 2022 was conducted. 
Inclusion criteria: studies that discussed the use of Mohs micrographic surgery in the management of carcinomas within boundaries of the oral cavity. 
Exclusion criteria: studies that discussed malignancies limited to the cutaneous surface of the mouth such as the cutaneous lips, vermillion lips, or perioral region.
Endpoints of interest included: type of study, category of tumors treated with MMS, number of patients or specimens analyzed, and main study outcome. 
Results
Nine studies met inclusion criteria. Seventy-seven patients were treated with MMS for OCC, 74 of which (96%) were treated for squamous cell carcinoma. The tongue was the most common site (n=57). Other cancers treated with MMS include basal cell carcinoma and melanoma. Zero patients treated with MMS had recurrence of their disease during follow-up periods, which ranged from 8-42 months. Mohs technique did not cause statistically significant increase in operating time. 
Conclusion
MMS may be an effective treatment for OCC, especially for squamous cell carcinomas, and tumors involving the tongue. Potential challenges to the use of MMS in oral tumors include: difficulty of appropriate visualization and operation in the oral cavity, the ability of Mohs surgeons to interpret histopathology from oral specimens, and the availability of labs that can process oral tissue for real-time analysis. These challenges may be overcome with stronger interdisciplinary collaboration among oral disease specialists, and the development of additional best-practice recommendations that can facilitate improved education of providers.






Systematic review of benefits and practical challenges for use of Mohs surgery in oral tumors

The authors present the case of a 29-year-old female diagnosed with acute appendicitis who underwent a laparoscopic appendectomy. Three weeks later, she returned to the emergency department with fevers, abdominal pain, chills, and nausea. Laboratory analysis revealed elevated liver enzymes and leukocytosis, and a computed tomography scan of the abdomen revealed a liver abscess. Interventional radiology placed an 8 French drainage catheter in the hepatic abscess and drained 40cc of purulent fluid. A culture of the abscess fluid revealed Streptococcus constellatus, Bacteroides fragilis, and Bacteroides ovatus. We believe appendicitis causes hematogenous spreading of bowel organisms along the portal vein, which is seeded to the liver.

Hepatic Abscess Following Acute Appendicitis

Objective: The objective of this article was to explore the efficacy of Metformin in increasing the overall survival of patients with pancreatic cancer and concurrent DM.
Methods: We used Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, conducted a literature search in PubMed, Science Direct, and Scopus, and eleven studies were included in the systematic review. 
Results: Metformn has been shown to have augmented survival in five studies, whereas no improvement was seen in other studies.
Conclusions: Our study found that Metformin can efficaciously improve survival in patients with pancreatic cancer with coexisting DM, but the results are still incongruent.The benefits of Metformin versus no Metformin treatment are to be considered thoughtfully in diabetic pancreatic cancer patients. 

Association between Metformin Use and Survival Outcome in Diabetic Pancreatic Cancer Patients

Background: 

Obstructive sleep apnea (OSA) is associated with increased bone mineral density loss. Hypoxia experienced in the OSA population was suspected to stimulate osteoclast activity 

and contribute to osteoporosis. Continuous positive air pressure (CPAP) therapy, the first line treatment for OSA, reduces nocturnal hypoxia. Therefore, this study evaluates the potential for CPAP therapy to slow down the process of bone loss. 

Methods: 

This is a retrospective cohort study reviewing the electronic medical records of patients between the ages of 45 to 70 years old with the diagnosis of OSA and on CPAP therapy. The OSA diagnosis was supported by a home sleep study, and the CPAP compliance was determined by 70% of usage, or an average of more than 4 hours per day with 5 days in a week. We compared the mean difference of T-score per year on Dual-energy X-ray absorptiometry scans in patients compliant with CPAP treatment and patients not compliant with CPAP, utilizing T-test analysis. 

Results: 

There are 113 patients included in the study, with 81 compliant and 32 non-compliant to CPAP therapy. The mean age of the CPAP compliant group (65.7 years) was higher than the non-compliant group (63.2 years). The mean annual change in T-score for lumbar spine, left femur neck, left femur total and left radius were -0.015 ±0.27, -0.003 ±0.19, 0.002 ±0.21, -0.019 ±0.22 respectively in CPAP compliant group, and -0.03 ±0.20, -0.050 ±0.14, -0.014 ±0.17, -0.012 ±0.26 in the non-compliant group. There was no statistical difference in annual bone density changes between the CPAP compliant and non-compliant group. 

Conclusion: 

This is the first study evaluating the effect of CPAP therapy on bone health. The mean reduction in T-score in three out of four areas each year was less in the CPAP compliant group although not reaching statistical significance, possibly limited by the small sample size. Further prospective study and larger sample size might reveal the effect of CPAP on reducing the speed of bone loss in OSA populations.

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Stroke Volume Index Predicts Mortality Following Aortic Valve Replacement

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An Updated Reference for Empiric Antibiotic Therapy in Hidradenitis Suppurativa

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