Charles C Marboe

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Researchers studied the immune response in heart transplant patients affected by cardiac allograft vasculopathy (CAV), focusing on certain antibodies produced by plasma cells in the grafts. They discovered that 57% of antibodies from the grafts reacted to bilirubin, a substance resulting from heme breakdown, which was found to accumulate in damaged heart tissue but not in healthy tissue. This suggests that the buildup of bilirubin and related immune responses may play a role in the development of CAV, opening doors for new treatment strategies. Who this helps: This benefits heart transplant patients and their doctors.

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This study looked at how certain types of microRNAs in the blood can help identify heart transplant rejection. Researchers tested 922 blood samples from 173 heart transplant recipients and found that higher microRNA scores were linked to higher rates of rejection: those with acute cellular rejection (ACR) had average scores of 78, while those without ACR averaged 42. This is significant because it shows that measuring these microRNAs could provide an easy way to check for transplant rejection without needing invasive procedures like heart biopsies. Who this helps: This benefits heart transplant patients by providing a noninvasive method for monitoring rejection.

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Researchers studied the transmission of a dangerous fungal infection called coccidioidomycosis through organ transplants between 2013 and 2022. They found 73 potential cases, with actual infections occurring in eight recipients from seven donors, leading to a 40% infection rate among those who received organs from contaminated donors. Notably, most recipients who received antifungal treatment survived, highlighting the importance of careful screening of donors and treatment for recipients to prevent severe outcomes. Who this helps: This research benefits patients receiving organ transplants and their doctors.

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This study examined blood samples from 104 heart transplant patients to understand how the body reacts to transplanted hearts. Researchers found that certain proteins, particularly CXCL10 and CD5, were linked to acute cellular rejection (ACR), while others like N-terminal pro-B-type natriuretic peptide were associated with antibody-mediated rejection (AMR). Specifically, the risk of detecting ACR increased significantly with higher levels of CXCL10 and CD5, and the likelihood of AMR increased with higher levels of N-terminal pro-B-type natriuretic peptide. Who this helps: This research benefits heart transplant patients by improving the understanding and detection of rejection.

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This study looked at a method to improve discarded human lungs to make them usable for transplantation by connecting them to the blood circulation of pigs. The researchers found that after the lungs were treated in this way, they showed no signs of a severe immune reaction known as hyperacute rejection when they were later connected back to human blood. This is significant because it means this technique could help recover more donor lungs for transplantation, potentially saving more lives. Who this helps: This helps patients in need of lung transplants.

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This study looked at lung transplant patients and how their bodies reacted at the molecular level after they experienced acute rejection or organizing pneumonia. Researchers found that patients who had higher levels of donor-derived cell-free DNA (dd-cfDNA) in the months following these events were about 2.8 times more likely to develop chronic lung allograft dysfunction (CLAD) or die. This is significant because it shows that measuring dd-cfDNA can help doctors better predict and manage the risk of serious problems after lung transplants. Who this helps: This benefits patients who have received lung transplants and their doctors, as it may improve monitoring and treatment decisions.

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The study looked at organizing pneumonia (OP) in lung transplant patients to see how it relates to acute rejection of the transplant and overall health outcomes. Researchers found that patients with OP had a 126% higher risk of antibody-mediated rejection (AMR) and a 16% higher risk of death compared to those without OP. This is important because it highlights that OP can signal serious complications for lung transplant patients, helping to identify those who may need closer monitoring. Who this helps: Patients who have undergone lung transplantation and their healthcare providers.

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This study looked at how acute cellular rejection (ACR) affects the long-term health of lung transplant patients. Researchers found that patients whose blood tests showed higher levels of donor DNA (more than 1%) during ACR were 3.32 times more likely to experience chronic lung problems or death compared to those with lower levels of donor DNA. Knowing this can help doctors identify which patients are at greater risk and may need more intensive monitoring and care after their transplant. Who this helps: This benefits lung transplant patients and their doctors.

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This study developed a new technology called SCPAT-GAN that can create virtual images resembling stained tissue samples from a type of heart scan called OCT, without needing a lot of detailed training data. The researchers found that the images produced by SCPAT-GAN closely matched real tissue samples in quality and accurately showed both healthy and diseased features. This is important because it can help doctors better understand and treat coronary artery disease by providing clear visualizations of heart tissue conditions. Who this helps: This benefits doctors and patients with coronary artery disease.

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This study looked at the risk of hepatitis B virus (HBV) transmission or reactivation in patients who received organs from donors with a history of hepatitis B (HBcAb+) and hepatitis C (HCV) infection. Out of 7,735 organs from 3,767 donors, only 7 patients experienced HBV issues after transplant, which is a low rate of 0.09%. This finding is important because it shows that using these organs, despite the risk factors, is generally safe, especially with proper preventive measures in place. Who this helps: This helps patients receiving transplants, especially those with hepatitis B or C.

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This study looked at how to tell if a cancer that appears after a solid organ transplant comes from the donor organ or the recipient. It found that new molecular biology techniques can quickly and accurately identify the source of the cancer using regular tissue samples, making them both affordable and widely available. This matters because determining the origin of the cancer can significantly influence treatment decisions and outcomes for patients. Who this helps: This benefits patients who have received organ transplants and may develop cancer.

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This study looked at the safety of using organs from donors who tested positive for COVID-19 (SARS-CoV-2) in order to address the shortage of available organs. Researchers found that from May 2021 to January 2022, 1,241 organs were successfully transplanted from 514 COVID-positive donors, with no cases of virus transmission to recipients. This matters because it shows that using organs from these donors can help reduce the organ shortage without increasing the risk of severe complications for patients receiving transplants. Who this helps: This helps patients in need of organ transplants.

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This study looked at heart injuries in patients who died from severe COVID-19 to understand what caused these issues. Researchers found that microthrombi, small blood clots, were the most common heart problem in the 69 patients they examined, and higher levels of inflammation were linked to these clots. Understanding the role of cardiac fibroblasts in this condition might help develop new treatments for heart problems related to COVID-19. Who this helps: This helps patients with severe COVID-19 and their doctors by identifying potential treatment targets for heart health.

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This study looked at levels of donor-derived cell-free DNA (dd-cfDNA) in patients who received either a single or double lung transplant to better understand how these levels relate to organ rejection. It found that patients with single lung transplants had lower dd-cfDNA levels compared to those with double lung transplants, with median values of 0.15% versus 0.46% when stable and 1.06% versus 1.78% during acute rejection. This is important because accurately interpreting dd-cfDNA levels could help doctors diagnose rejection more effectively and make better treatment decisions. Who this helps: This benefits lung transplant patients and their doctors.

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This study focused on familial hypertrophic cardiomyopathy (HCM), a common inherited heart disease that can lead to serious complications. The researchers found that certain genetic mutations in cardiac proteins lead to increased force generation in heart muscle cells, which in turn causes heart enlargement and dysfunction. Specifically, they identified a pathway involving a protein called Muscle LIM Protein, which, when altered, can worsen HCM symptoms in affected families, revealing that treating these changes may prevent heart issues. Who this helps: This research benefits patients with familial hypertrophic cardiomyopathy and their doctors by providing new insights for potential treatments.

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Researchers created a realistic model of acute respiratory distress syndrome (ARDS) using pigs that are similar in size to humans. They found that all the pigs developed moderate to severe symptoms of ARDS, with noticeable increases in lung swelling and injury over time. This model is important because it provides a platform to test new treatments for ARDS, a condition that can have a high death rate of over 30%. Who this helps: This helps researchers and doctors looking for effective treatments for ARDS.

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This study looked at the changes in the lung structure of patients with end-stage cystic fibrosis, focusing on the distal (far) part of the lungs, which hasn't been studied much before. Researchers found 68 proteins in the lung matrix that were expressed differently in cystic fibrosis patients, with over 90% of these proteins showing lower levels than in healthy lungs. This is important because it suggests that while the total amount of lung matrix remains the same, the diversity of proteins is reduced, which could impact lung health and point towards new treatments that not only fix the defective protein in cystic fibrosis but also improve the lung's structure. Who this helps: Patients with cystic fibrosis.

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Researchers studied T cells involved in a heart condition called cardiac allograft vasculopathy (CAV). They found that T cells in the heart and in the blood of four patients had a lot in common, indicating a strong immune response happening in the heart related to the disease. Notably, these T cells were linked to inflammation and fibrosis, and some were similar to T cells found in blood from unrelated donors. Who this helps: This research benefits doctors and patients with cardiac allograft vasculopathy by improving understanding of immune responses in heart transplants.

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This study looked at how certain small RNA molecules, known as miRNAs, in the blood can help detect heart transplant rejection, a serious problem that can affect up to one-third of patients shortly after their surgery. Researchers found three specific miRNAs that had higher levels in patients experiencing heart rejection compared to those without rejection. This finding is important because it suggests that measuring these miRNAs could be a less invasive and safer way to monitor heart transplant health compared to current methods that involve risky biopsies. Who this helps: This helps heart transplant patients and their doctors.

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This study looked at the hearts of 69 people who died from severe COVID-19 to understand why some had heart damage. They found that 70% of the cases showed tiny blood clots (called microthrombi) in the heart, which were linked to higher levels of inflammation in the body. This research highlights the changes in heart tissue that occur during severe COVID-19, helping to explain how the virus can cause serious heart issues. Who this helps: This research benefits patients recovering from COVID-19 and doctors treating them by providing insights into potential heart complications.

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This study looked at how different types of antibody mediated rejection (AMR) occur after heart transplants, especially focusing on patients with and without specific donor antibodies (DSA). Researchers found that the gene activity in heart tissue samples was quite different between these two groups; those with DSA showed signs of immune system activation, while those without DSA had a different gene expression pattern. Understanding these differences matters because it helps refine how AMR is diagnosed and potentially treated, acknowledging that there are various underlying causes for graft failure. Who this helps: This helps patients who have undergone heart transplants and their doctors by providing clearer diagnostic tools.

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This study looked at a 65-year-old man who developed a rare heart infection called infective endocarditis after receiving a lung transplant. He had been exposed to certain conditions while living in Peru, which contributed to his condition, and his infection was linked to a specific fungus. The patient was treated successfully with antifungal medication, and this case shows the importance of doctors gathering detailed histories about patients' backgrounds before transplanting organs, as it can prevent complications after surgery. Who this helps: This helps doctors in assessing risks for lung transplant patients.

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This study looked at a type of heart disease called wild-type transthyretin cardiac amyloidosis (ATTRwt-CA), which is more common than people thought. Researchers found two patients who had heart issues along with liver problems, but their liver disease was due to a rare condition unrelated to their heart disease. This is important because it shows that doctors should consider different causes for liver problems in patients with this type of heart disease, rather than assuming the liver issues are just a result of heart failure. Who this helps: This primarily benefits doctors and healthcare teams treating patients with ATTRwt-CA.

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This study looked at patients who received heart transplants to see how their immune systems reacted to different proteins after the surgery. Researchers found that 67% of patients with antibody-mediated rejection (AMR) had higher reactions to specific non-HLA proteins compared to those without AMR, indicating that these reactions might be important in transplant outcomes. In particular, reactions to four specific proteins were linked to a higher risk of transplant failure. Who this helps: This research benefits heart transplant patients and doctors by improving understanding of factors that may affect transplant success.

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This study looked at how different sizes of stitches used in connecting blood vessels affect how well those connections work in rats. The researchers found that stitches that were larger than usual didn’t lead to any issues with blood flow; all 24 connections remained open after 5 days. However, using the standard size stitches made the surgeries quicker, taking an average of 25.5 minutes compared to over 41 minutes for the larger stitches. Who this helps: This benefits medical trainees learning surgical techniques and patients receiving microvascular surgeries.

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This study focused on identifying genetic causes of a serious heart condition called dilated cardiomyopathy (DCM) in children. Researchers found that changes in a specific gene, PPP1R13L, were linked to DCM in seven children from five different families. The children showed symptoms at a very young age, and the condition was severe, leading to three deaths and three heart transplants, highlighting the urgent need for genetic testing to improve diagnosis and treatment. Who this helps: This helps families of children with heart conditions and doctors looking for accurate genetic information to guide care.

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This study looked at the autopsies of 40 people who died from COVID-19 to understand the different lung damage patterns caused by the virus. The researchers found that most patients (73%) had diffuse alveolar damage, a common type of lung injury, while 90% had an issue called intravascular fibrin aggregates. Interestingly, 27% of patients showed a different pattern with no major lung damage, which was surprising and linked to shorter hospital stays and fewer major lung problems. Who this helps: This information helps doctors understand the different ways COVID-19 can affect lungs, improving care for patients with the disease.

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This study looked at using near-infrared spectroscopy (NIRS) to help doctors map the surface of the heart, specifically where fatty tissue is located. The researchers found a strong relationship (with a correlation of 0.884) between the thickness of the fatty tissue on the heart's surface and the measurements taken by NIRS. This method could make it easier to identify and treat heart problems caused by abnormal tissue during procedures known as epicardial ablation. Who this helps: This benefits patients with difficult-to-treat heart conditions and doctors performing heart procedures.

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This study explored a new method to keep donor lungs healthy outside the body for up to four days, using a system where blood circulation from live pigs supported the lungs. Researchers found that the lungs maintained good function and the pigs remained stable throughout this period, with functional lung measurements staying above key thresholds. This advancement could help make more lungs available for transplant, improving outcomes for patients in need. Who this helps: Patients awaiting lung transplants.

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Most donated lungs are never used because injury makes them too risky for transplant. Researchers connected damaged human lungs to a living pig's circulation as an extended support system and showed the lungs could recover function over multiple days. This xenogeneic cross-circulation approach could dramatically increase the number of usable donor lungs.

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This study examined the structure of the area where the pulmonary veins connect to the heart using a technique called optical coherence tomography (OCT). Researchers found that the detailed images of this junction, which included important features like tissue composition and fiber alignment, varied among different veins. Understanding these details can help doctors improve the effectiveness of atrial fibrillation treatments by better guiding their procedures. Who this helps: This helps patients with atrial fibrillation who undergo ablation treatment.

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This study looked at how 3D printed models of the heart can help medical students learn about congenital heart disease (CHD). After using these models, students' knowledge improved significantly about different types of heart issues, with an average increase of 4.23 points on a confidence scale. The findings show that students preferred the 3D models over other learning methods, emphasizing that they were especially helpful for understanding more complex heart conditions. Who this helps: This benefits medical students learning about heart disease.

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This study looked at how a special imaging technique called optical coherence tomography (OCT) can be used to better understand the structure of the heart. Researchers found that OCT can help identify critical parts of the heart, monitor treatments, and improve our understanding of heart diseases by creating detailed images at a cellular level. This matters because having better images can lead to more effective treatments for heart problems, which are a major health issue. Who this helps: Patients with heart disease and doctors treating them.

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This study focused on using a technology called optical coherence tomography (OCT) to create detailed images of the heart's structure in 50 human hearts. The researchers found that OCT could effectively identify different types of heart tissue, revealing important differences, such as how fat and thickened collagen appear in various heart chambers. These findings are important because they can help improve diagnosis and treatment options for heart conditions by providing better images of cardiac abnormalities. Who this helps: This benefits doctors and patients dealing with heart disease.

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This study focused on a rare condition called quadravalvular noninfectious endocarditis, where blood clots appear on heart valves without being related to a bacterial infection. The researchers found that, unlike typical cases that show certain signs of clotting, this case was linked to the accumulation of a specific protein called immunoglobulin M heavy chain. This discovery helps understand a unique type of heart valve issue that lacks the usual signs of infection. Who this helps: This benefits doctors and researchers looking to better understand heart valve diseases.

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This study looked at using a specialized imaging technique called optical coherence tomography (OCT) to examine the left atrium of human hearts, focusing on fat tissue and the orientation of muscle fibers. Researchers analyzed images from 7 human hearts and found that areas of fat tissue were spread out near the septum and pulmonary veins, with thickness measurements ranging from 1.42 to 28.74 mm, and most of the fiber orientation data was found around these same areas. This information is important because it can help doctors better guide treatments for atrial fibrillation by showing them where fat tissue is located, which may influence how they plan their procedures. Who this helps: This research benefits doctors performing atrial fibrillation treatments.

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Researchers studied a new method to repair severely damaged lungs that are usually not suitable for transplant. They used a technique called interventional cross-circulation in pigs with lung injuries caused by gastric aspiration. This approach significantly improved lung function and helped restore healthy lung cells, suggesting that it could make more lungs available for transplant, potentially expanding the number of donor organs. Who this helps: This benefits patients with end-stage lung disease in need of transplants.

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This study looked at a new imaging technique called cross-polarization optical coherence tomography (CP-OCT) that can take detailed pictures of heart muscle in a single measurement. The researchers found that this method can clearly identify different types of heart tissue, such as healthy muscle, scarred muscle, and tissue affected by previous treatments, by analyzing their structural differences. This is important because it can help doctors better understand heart conditions and tailor treatment plans for their patients. Who this helps: Patients with heart disease and their doctors.

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This study looked at two surgical techniques used to connect small blood vessels in rats: the minimal-touch technique and the eversion technique. Researchers found that both methods had the same success rate—100%—for keeping the blood vessels open after surgery, regardless of whether they were checked 48 hours or 2 weeks later. However, the eversion technique resulted in less inflammation around the blood vessels after two weeks, which could be important for healing. Who this helps: This benefits surgeons and patients undergoing vascular surgeries.

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This study looked at how specific antibodies, called donor-specific anti-HLA antibodies (DSA), affect heart transplant outcomes. Of the 221 patients followed, 31% had these antibodies, and while they did not effectively diagnose rejection, they showed a strong link to poor outcomes: having any DSA during rejection increased the chance of heart graft problems by over five times, and patients with newly formed class II DSA had a 151% higher risk of losing their graft. This information is important because it helps doctors better understand the risks for patients after a heart transplant and how to manage their care effectively. Who this helps: Heart transplant patients and their doctors.

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Researchers studied a 3-year-old boy with a rare genetic condition that caused serious heart problems. They used a new type of temporary stent made from materials that dissolve over time to treat his coronary artery disease, which was successful, allowing him to recover and stay symptom-free for three months after the procedure. Unfortunately, he later died from complications unrelated to his heart treatment, but the stents remained clear and functioning. This case is important because it shows that this new treatment could be helpful for children with serious heart conditions, which is a much less explored area in medical care. Who this helps: This helps children with coronary artery disease and their doctors.

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This study looked at heart transplant patients to understand how the level of cellular rejection affects fat buildup in their coronary arteries. They found that patients who had a history of severe rejection (grade 3A or higher) had significantly more fatty plaque in their arteries, with average lipid core burden indexes (maxLCBI) of 243 compared to 41 in patients with milder rejection. This is important because it highlights a clear link between severe rejection and increased risk of heart problems, helping doctors identify which patients may be more vulnerable. Who this helps: This helps heart transplant patients and their doctors monitor and manage heart health more effectively.

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This study looked at how heart disease differs between transplant patients and those with traditional heart disease, using advanced imaging technology. They found that heart transplant patients who had severe cellular rejection had smaller areas in their arteries compared to patients with traditional heart disease, which may lead to more serious complications like narrower blood vessels. These differences are important because they could help doctors better identify and manage heart issues in transplant patients. Who this helps: This information benefits heart transplant patients and their doctors.

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This study focused on using a technology called optical coherence tomography (OCT) to examine and classify different types of tissue in the heart's atria. Researchers created an automated method that could correctly identify tissue types—such as fat, heart muscle, and scar tissue—from images about 80.41% of the time. This advancement is important because it could help doctors better understand heart conditions and improve treatment options. Who this helps: This benefits patients with heart diseases and their doctors.

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This study looked at a new imaging system using a technique called optical coherence tomography (OCT) specifically designed for capturing images of heart tissue. The system achieved a very fine detail level (2.72 micrometers) and could see about 1.78 mm into the tissue, allowing researchers to clearly identify important structures in heart samples. This matters because better imaging of heart tissue can help doctors understand heart diseases and tailor treatments more effectively. Who this helps: Patients with heart conditions and their doctors.

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This study looked at how the timing of a condition called antibody-mediated rejection (AMR) affects the survival and health of heart transplant patients. Researchers found that patients experiencing AMR more than a year after their transplant (late AMR) had a higher rate of graft dysfunction and significantly lower survival rates—only 36% were alive five years later, compared to 73% for those with early AMR. This matters because it shows that late AMR, especially when accompanied by graft dysfunction, leads to increased risks of death and serious heart complications, which can affect how doctors manage post-transplant care. Who this helps: This helps heart transplant patients and their healthcare providers.

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This study looked at a new type of catheter that combines near-infrared spectroscopy (NIRS) with radiofrequency ablation (RFA) treatment for patients with atrial fibrillation. Researchers tested this catheter first on artificial tissue and then on heart tissues from pigs and humans, and they found that it provided important information for the RFA process, such as confirming good tissue contact and assessing how deep the treatment went. These advancements are significant because they can help doctors make more effective and precise treatments for heart patients. Who this helps: Patients with atrial fibrillation undergoing treatment.