J A Madsen studies how to enhance the safety and effectiveness of CRISPR technology, which is used to edit genes in organisms. They specifically look at how the guide RNA, a crucial part of the CRISPR system, can be made more accurate to avoid errors when editing genes. Additionally, their research explores how gene editing can be used to lower cholesterol levels by disabling specific genes in the liver. This research is particularly relevant for patients suffering from genetic diseases and those at risk of heart-related issues.
Key findings
Achieved precision in detecting guide RNA impurities down to less than 1%, enhancing CRISPR editing accuracy.
A single CRISPR gene-editing injection reduced cholesterol levels by about 60% in monkeys, with sustained low levels for at least 8 months without further treatment.
Showed that modified fat particles can be effectively used to deliver CRISPR components to specific organs like the liver.
Frequently asked questions
Does Dr. Madsen study genetic disorders?
Yes, Dr. Madsen investigates ways to improve CRISPR gene editing, which directly benefits patients with genetic disorders.
What treatments has Dr. Madsen researched?
Dr. Madsen has researched CRISPR-based treatments for lowering cholesterol and other genetic conditions.
Is Dr. Madsen's work relevant to heart disease patients?
Absolutely, their research on CRISPR gene editing has shown potential for a one-time treatment that could significantly reduce cholesterol levels in heart disease patients.
Publications in plain English
Real-World Analysis of Inflammatory Dermatologic Conditions and Their Association With Keratoconus.
2025
Cornea
Muayad J, Madsen JA, Sontam TR, Loya A, Lee AG +1 more
Plain English This study looked at whether certain inflammatory skin conditions, like atopic dermatitis and psoriasis, increase the risk of developing keratoconus, a vision-threatening eye condition. Researchers analyzed health records from about 165 million patients and found that those with atopic dermatitis had more than twice the risk of developing keratoconus over five years, with a risk ratio of 2.32, while psoriasis also posed a significant risk with a ratio of 1.93. This matters because it suggests that people with these skin conditions might need closer eye monitoring to catch keratoconus early.
Who this helps: This helps patients with inflammatory skin conditions and their doctors by highlighting the need for regular eye check-ups.
Ion Mobility Gas-Phase Separation Enhances Top-Down Mass Spectrometry of Heavily Modified Guide RNA.
2025
Analytical chemistry
Macias LA, Lowther J, Tillotson EL, Rohde E, Madsen JA
Plain English This study looked at a technique to better analyze the guide RNA (gRNA) used in CRISPR gene editing therapies. Researchers combined mass spectrometry with a method called ion mobility, which allowed them to clearly identify 95% of the gRNA sequence, including its chemical modifications that traditional methods often miss. This advancement is crucial because it ensures more accurate characterization of gRNA, which can improve the effectiveness and safety of gene editing treatments.
Who this helps: This benefits researchers and doctors working on gene editing therapies.
Spacer Fidelity Assessments of Guide RNA by Top-Down Mass Spectrometry.
2023
ACS central science
Macias LA, Garcia SP, Back KM, Wu Y, Johnson GH +5 more
Plain English The study examined how to improve the accuracy of guide RNA used in CRISPR gene editing. Researchers found a way to detect and measure tiny impurities in the RNA, achieving precision down to less than 1%. This matters because ensuring the guide RNA is correct can enhance the effectiveness and safety of CRISPR-based treatments for genetic disorders.
Who this helps: This benefits patients with genetic diseases who may receive CRISPR therapies.
Going beyond conventional wastewater treatment plants within circular bioeconomy concept - a sustainability assessment study.
2022
Water science and technology : a journal of the International Association on Water Pollution Research
Marami H, Tsapekos P, Khoshnevisan B, Madsen JA, Andersen JK +2 more
Plain English The study examined how to improve wastewater treatment plants by turning them into biorefineries that not only clean water but also produce valuable products like biomethane and microbial protein. It found that this new approach could reduce harmful environmental impacts by over 1.07 species per year and save about $1.68 for every unit processed, making it much more sustainable. However, the high startup costs and low profits currently make it challenging to implement widely.
Who this helps: This benefits communities and environmental organizations looking for greener waste management solutions.
From wastewater treatment to water resource recovery: Environmental and economic impacts of full-scale implementation.
2021
Water research
Faragò M, Damgaard A, Madsen JA, Andersen JK, Thornberg D +2 more
Plain English This study looked at how upgrading wastewater treatment plants can reduce pollution and improve efficiency. Specifically, it tested new technologies and found that using real-time controls on nitrogen emissions reduced carbon dioxide emissions by 35%. These upgrades not only help the environment but also come with varying costs; real-time nitrogen controls were the only option that didn’t incur additional expenses.
Who this helps: This benefits wastewater treatment plant operators and local governments aiming to enhance sustainability while managing costs.
In vivo CRISPR base editing of PCSK9 durably lowers cholesterol in primates.
2021
Nature
Musunuru K, Chadwick AC, Mizoguchi T, Garcia SP, DeNizio JE +37 more
Plain English Researchers used a gene-editing tool called CRISPR to permanently disable a gene in monkeys' livers that controls cholesterol production, delivering it through tiny fat particles injected into the bloodstream. After a single injection, the monkeys' cholesterol dropped by about 60% and stayed low for at least 8 months without any additional treatment. This proves that gene editing could offer heart disease patients a one-time treatment instead of taking cholesterol drugs for life.
Data-independent oxonium ion profiling of multi-glycosylated biotherapeutics.
2018
mAbs
Madsen JA, Farutin V, Lin YY, Smith S, Capila I
Plain English This research focused on developing a new method to analyze the complex sugar structures attached to therapeutic proteins, which are crucial for their effectiveness. The team created a technique that can identify both known and unknown sugar forms on these proteins, allowing for a more complete analysis. They successfully used this method to compare different versions of a monoclonal antibody and found that it could quickly provide a profile of the sugars present.
Who this helps: This benefits researchers and developers of protein therapies, helping them ensure the quality and effectiveness of their treatments.
Covalent Labeling Denaturation Mass Spectrometry for Sensitive Localized Higher Order Structure Comparisons.
2016
Analytical chemistry
Madsen JA, Yin Y, Qiao J, Gill V, Renganathan K +3 more
Plain English This study explored a new method for analyzing the three-dimensional structure of proteins, which is important for the quality of biopharmaceutical products. The researchers found that using a higher amount of a specific label allowed them to detect structural differences in proteins that make up just 2.5-5% of the sample, something traditional methods couldn't do effectively. This method not only improved sensitivity but also allowed for the assessment of other critical protein features in a more streamlined way.
Who this helps: This benefits researchers and developers in the biopharmaceutical industry, ensuring safer and more effective drug products.
Toward the complete characterization of host cell proteins in biotherapeutics via affinity depletions, LC-MS/MS, and multivariate analysis.
2015
mAbs
Madsen JA, Farutin V, Carbeau T, Wudyka S, Yin Y +3 more
Plain English This study focused on understanding the impurities, called host cell proteins (HCPs), that can contaminate therapeutic antibodies made by living cells. Researchers developed a detailed method that identified nearly 700 different HCPs present in very low amounts (less than 10 parts per million) in antibody samples, helping to understand how these impurities might affect drug effectiveness and safety. By analyzing these impurities closely, the study helps ensure that therapies made from different production processes are safe and effective for patients.
Who this helps: This benefits patients who rely on monoclonal antibody treatments.
The outer membrane of Gram-negative bacteria: lipid A isolation and characterization.
2013
Methods in molecular biology (Clifton, N.J.)
Hankins JV, Madsen JA, Needham BD, Brodbelt JS, Trent MS
Plain English This study focused on extracting and analyzing a part of Gram-negative bacteria called lipid A, which is important for understanding the bacteria's protective outer layer. The researchers shared specific methods for isolating lipid A, including advanced techniques like mass spectrometry, which helps identify the structure of these molecules in detail. Understanding lipid A better can lead to improved strategies for dealing with infections caused by these bacteria.
Who this helps: This benefits researchers and scientists working on bacterial infections and developing new antibiotics.
High-throughput database search and large-scale negative polarity liquid chromatography-tandem mass spectrometry with ultraviolet photodissociation for complex proteomic samples.
Plain English This study explored a new method for analyzing proteins in complex biological samples. Researchers developed a technique called ultraviolet photodissociation (UVPD) that helped identify a total of 3,663 peptides from one type of sample and 2,350 from another, revealing unique proteins that other methods missed—49 and 50 respectively. This advancement allows for better detection of a wider variety of proteins, which is crucial for understanding health and diseases.
Who this helps: This benefits researchers and scientists studying diseases and developing new treatments.
Concurrent automated sequencing of the glycan and peptide portions of O-linked glycopeptide anions by ultraviolet photodissociation mass spectrometry.
2013
Analytical chemistry
Madsen JA, Ko BJ, Xu H, Iwashkiw JA, Robotham SA +3 more
Plain English This study investigated a new technique for analyzing complex molecules called O-glycopeptides, which are made up of sugars and proteins. Using a method called ultraviolet photodissociation mass spectrometry, researchers successfully obtained complete information about both the protein and sugar parts of these molecules in one go, achieving 100% sequence coverage. This is important because it allows for a better understanding of how specific modifications to these molecules affect their role in diseases, particularly in identifying new aspects of how a problematic bacteria, A. baumannii, operates.
Who this helps: This benefits researchers and healthcare providers focusing on bacterial infections.
Characterization of unique modification of flagellar rod protein FlgG by Campylobacter jejuni lipid A phosphoethanolamine transferase, linking bacterial locomotion and antimicrobial peptide resistance.
2012
The Journal of biological chemistry
Cullen TW, Madsen JA, Ivanov PL, Brodbelt JS, Trent MS
Plain English This study looked at a protein called FlgG in the bacteria Campylobacter jejuni, which helps the bacteria move. Researchers found that a specific modification known as phosphoethanolamine (pEtN) is added to FlgG at one spot, which is crucial for its function. When this modification is missing, the bacteria have trouble moving properly, which could affect how they cause infections.
Who this helps: This helps doctors and researchers understand how bacterial movement affects infections, offering insights for treatment strategies.
193 nm ultraviolet photodissociation of imidazolinylated Lys-N peptides for de novo sequencing.
2012
Analytical chemistry
Robinson MR, Madsen JA, Brodbelt JS
Plain English This study focused on improving a method for identifying the sequence of proteins by breaking them down into smaller pieces. Researchers used a new technique involving ultraviolet light that made it easier to create clearer patterns of data (called "golden ions") from the peptides they analyzed. They found that their method produced better results, achieving up to 50% more of these ideal fragments, which helps scientists determine how proteins are built more accurately.
Who this helps: This helps researchers and scientists working in protein analysis and drug development.
Charge-site-dependent dissociation of hydrogen-rich radical peptide cations upon vacuum UV photoexcitation.
2012
Chemistry (Weinheim an der Bergstrasse, Germany)
Madsen JA, Cheng RR, Kaoud TS, Dalby KN, Makarov DE +1 more
Plain English This study examined how certain peptide molecules break apart when exposed to specific types of light. Researchers found that the position of an amino acid called arginine in the peptide affects how it splits, with differences observed in 94% of cases studied. Understanding these reactions is important for better identifying how proteins are modified in the body, which can have implications for diseases and treatments.
Who this helps: This helps researchers and doctors studying protein functions and modifications in various diseases.
Amino acid addition to Vibrio cholerae LPS establishes a link between surface remodeling in gram-positive and gram-negative bacteria.
2012
Proceedings of the National Academy of Sciences of the United States of America
Hankins JV, Madsen JA, Giles DK, Brodbelt JS, Trent MS
Plain English This study looked at how the bacteria Vibrio cholerae, which causes cholera, can resist a specific antibiotic called polymyxin B. Researchers discovered that a key feature of this resistance involves modifying part of the bacterial structure with amino acids, which made resistant strains 100 times better at evading the antibiotic compared to those without these modifications. Understanding this mechanism is important because it sheds light on how different bacteria defend themselves against treatments, which can help develop better strategies to combat bacterial infections.
Who this helps: This helps doctors and researchers working to find more effective treatments against antibiotic-resistant infections.
Systematic comparison of ultraviolet photodissociation and electron transfer dissociation for peptide anion characterization.
2012
Journal of the American Society for Mass Spectrometry
Shaw JB, Madsen JA, Xu H, Brodbelt JS
Plain English This study compared two techniques—ultraviolet photodissociation (UVPD) and negative electron transfer dissociation (NETD)—to see which is better for analyzing peptides, which are small chains of proteins. Researchers found that UVPD provided much more detailed information, especially for peptides with low charge states (up to 2 charges), identifying more sequence variations. This is important because it helps scientists and doctors understand proteins better, potentially aiding in disease diagnosis or treatment development.
Who this helps: This benefits researchers and healthcare professionals studying protein-related diseases.
Han SW, Lee SW, Bahar O, Schwessinger B, Robinson MR +4 more
Plain English This study looked at a specific protein from a type of bacteria known as Xanthomonas oryzae, which causes disease in rice plants. Researchers found that this protein, called RaxST, adds a sulfate group to a specific part of another protein (tyrosine 22 of Ax21) in bacteria. This discovery is significant because it shows a new way bacteria can modify their proteins, which could affect how they interact with plant immune systems and communicate with each other.
Who this helps: This helps researchers and farmers working on plant disease management.
193-nm photodissociation of singly and multiply charged peptide anions for acidic proteome characterization.
2011
Proteomics
Madsen JA, Kaoud TS, Dalby KN, Brodbelt JS
Plain English This research focused on using a specific type of ultraviolet light (193-nm) to break apart charged peptide molecules, which are important for studying proteins. The study found that this method provided very detailed information about the proteins, achieving nearly complete sequencing of the peptides in most cases, especially for those with higher charges. This is significant because it allows scientists to better identify and understand proteins, especially those that have specific chemical modifications, like phosphorylation.
Who this helps: This benefits researchers and scientists working in protein analysis and biomarker discovery.
IR and UV photodissociation as analytical tools for characterizing lipid A structures.
2011
Analytical chemistry
Madsen JA, Cullen TW, Trent MS, Brodbelt JS
Plain English This research examined two advanced techniques, ultraviolet photodissociation (UVPD) and infrared multiphoton dissociation (IRMPD), for analyzing the structures of lipid A, a component of bacterial membranes. The study found that UVPD at 193 nm and activated-electron photodetachment (a-EPD) produced more and varied breakdown products of lipid A compared to traditional methods, allowing better differentiation of molecules with different chemical modifications. This is important because it helps scientists identify and understand lipid A structures more accurately, which could lead to better insights into bacterial behavior and potential treatments.
Who this helps: This helps researchers studying bacterial infections and developing new antibiotics.
Elucidation of a novel Vibrio cholerae lipid A secondary hydroxy-acyltransferase and its role in innate immune recognition.
2011
Molecular microbiology
Hankins JV, Madsen JA, Giles DK, Childers BM, Klose KE +2 more
Plain English This study examined the outer membrane of the bacteria Vibrio cholerae, which causes cholera. Researchers found that the bacteria produce a specific type of lipid A that helps them resist antimicrobial peptides, which are part of our body's defense system. They discovered a new enzyme called LpxN that plays a role in adding a particular part to this lipid, but this addition doesn't influence how the immune system recognizes the bacteria.
Who this helps: This helps patients at risk of cholera by improving our understanding of how the bacteria evade the immune system.
Asymmetric charge partitioning upon dissociation of DNA duplexes.
2010
Journal of the American Society for Mass Spectrometry
Madsen JA, Brodbelt JS
Plain English This study looked at how DNA strands break apart when energized, specifically how the electrical charge is distributed between the resulting single strands. Researchers found that when DNA strands are smaller and less charged, they split more evenly. In contrast, larger, more heavily charged strands did not share the charge equally; for instance, larger DNA duplexes showed a higher degree of uneven charge distribution. This is important because understanding how DNA strands break and distribute charge can help improve techniques in genetic research and treatments.
Who this helps: This research benefits genetic researchers and healthcare professionals involved in DNA-related treatments.
Ultrafast ultraviolet photodissociation at 193 nm and its applicability to proteomic workflows.
2010
Journal of proteome research
Madsen JA, Boutz DR, Brodbelt JS
Plain English This study looked at a new method called ultraviolet photodissociation (UVPD) to analyze proteins more effectively using mass spectrometry. Researchers found that UVPD at a specific wavelength (193 nm) produced useful data from tryptic peptides, improving the clarity of protein analysis compared to traditional methods. In tests with bovine serum albumin and human cancer cells, the new technique provided either similar or better results in identifying proteins, especially in difficult situations where protein signals were weak.
Who this helps: This helps researchers and doctors in the fields of proteomics and cancer diagnostics.
Comparison of infrared multiphoton dissociation and collision-induced dissociation of supercharged peptides in ion traps.
2009
Journal of the American Society for Mass Spectrometry
Madsen JA, Brodbelt JS
Plain English Researchers compared two methods, infrared multiphoton dissociation (IRMPD) and collision-induced dissociation (CID), to study supercharged peptide ions, which are important for identifying proteins. They found that IRMPD produced more useful ion signals than CID, especially as the charge of the peptides increased. This is significant because it means that IRMPD can lead to a better understanding of protein structures, which is crucial for developing new treatments and diagnostics.
Who this helps: This helps scientists and researchers working on protein-related diseases.
Simplifying fragmentation patterns of multiply charged peptides by N-terminal derivatization and electron transfer collision activated dissociation.
2009
Analytical chemistry
Madsen JA, Brodbelt JS
Plain English This study focused on improving the analysis of complex peptides (the building blocks of proteins) using a specific laboratory technique. Researchers found that by attaching a small chemical group to the beginning of these peptides and using a new method for breaking them apart, they could create clearer and simpler results. Specifically, they produced a type of ion that made it easier to analyze the peptides and identify their sequences, achieving better results for different types of peptides.
Who this helps: This benefits researchers and scientists working in biochemistry and drug development.
Infrared multiphoton dissociation of peptide cations in a dual pressure linear ion trap mass spectrometer.
2009
Analytical chemistry
Gardner MW, Smith SI, Ledvina AR, Madsen JA, Coon JJ +3 more
Plain English This study looked at a new method for breaking down peptide ions using infrared light in a special type of mass spectrometer. Researchers found that in a low-pressure environment, almost all peptide ions could be effectively broken apart within 25 milliseconds, leading to more complete and clearer results compared to traditional methods. This is important because it means scientists can better analyze peptides, which are crucial for understanding proteins and diseases.
Who this helps: This helps researchers and doctors working on protein-related diseases.
Top-down protein fragmentation by infrared multiphoton dissociation in a dual pressure linear ion trap.
2009
Analytical chemistry
Madsen JA, Gardner MW, Smith SI, Ledvina AR, Coon JJ +3 more
Plain English This study explored a new method for identifying proteins using a technique called infrared multiphoton dissociation (IRMPD) in a special device. Researchers found that IRMPD helped identify larger proteins (about 29 kDa) more accurately than traditional methods, leading to more reliable results in about 85% of cases compared to previous techniques. This improvement is important because it can significantly streamline the process of analyzing proteins, which is essential for various medical and scientific applications.
Who this helps: Patients and researchers needing better protein analysis for diagnosis and treatment development.
Biliary tract obstruction secondary to mycosis fungoides: a case report.
1999
Journal of clinical gastroenterology
Madsen JA, Tallini G, Glusac EJ, Salem RR, Braverman I +1 more
Plain English This study looked at a patient with a rare type of skin cancer called mycosis fungoides that caused a blockage in the bile ducts, leading to jaundice (yellowing of the skin and eyes). After various tests did not find a clear cause, surgery was done to remove the gallbladder and parts of the bile ducts, revealing cancer cells similar to those found in a skin biopsy from the same patient. This finding is important because it shows that mycosis fungoides can affect the bile ducts alone, a situation not reported before, helping doctors recognize this as a possible reason for jaundice.
Who this helps: This helps doctors in diagnosing and treating patients with mycosis fungoides.
Endothelial cell growth factor enhances musculocutaneous flap survival through the process of neovascularization.
1999
Annals of plastic surgery
Pu LL, Ahmed S, Thomson JG, Reid MA, Madsen JA +1 more
Plain English This study looked at how a factor called endothelial cell growth factor (ECGF) affects the survival of skin and muscle flaps in rats, which are used in surgeries to cover wounds or defects. The researchers found that administering ECGF improved the survival area of the skin flap by a significant amount—comparing treated groups showed a clear benefit over the control group (with p-values less than 0.001). This is important because it means that using ECGF can help improve healing in patients who need reconstructive surgery.
Who this helps: This helps patients undergoing reconstructive surgery by improving their healing outcomes.
Plain English This study looked at the livers of 418 babies who died suddenly in their first year of life to see if fatty acid oxidation (FAO) disorders were to blame. Out of these cases, 25 showed signs of being affected by FAO disorders, with 14 cases fitting the profiles of specific disorders. The findings suggest that about 5% of these sudden deaths in infants may be linked to FAO disorders, highlighting the need for better detection methods.
Who this helps: This helps doctors and researchers identify potential causes of sudden infant death and improve screening for affected infants.
Plain English The study looked at patients with juvenile polyposis who had surgery to remove their colons and create an internal pouch. Researchers found that one patient developed multiple large polyps in their pouch less than ten years after the surgery, and while most of the polyps were benign, three had serious changes that could lead to cancer. This is important because it highlights the need for close monitoring of patients with severe juvenile polyposis after such surgery, as they may face risks similar to those they had before.
Who this helps: This helps patients with juvenile polyposis and their doctors.
Interferon alpha enhances expression of TAG-72 and carcinoembryonic antigen in patients with primary colorectal cancer.
1995
Cancer immunology, immunotherapy : CII
Mahvi DM, Madsen JA, Witt PL, Sondel PM
Plain English This study looked at how a treatment called interferon alpha affects certain markers on tumor cells in patients with primary colorectal cancer. After receiving interferon alpha, two out of six patients showed increased levels of a marker called TAG-72, while it did not help another patient with the same marker. This is important because boosting these tumor markers can improve immunotherapy treatments that use antibodies to target cancer cells.
Who this helps: This helps patients with colorectal cancer and their doctors by improving treatment options.
Infantile spasms. Comparative trial of nitrazepam and corticotropin.
1986
Archives of neurology
Dreifuss F, Farwell J, Holmes G, Joseph C, Lockman L +4 more
Plain English This study looked at two treatments, nitrazepam and corticotropin, for infants with a condition called infantile spasms. Both medications helped reduce the number of spasms in babies, but there was no clear winner between the two. While the side effects were similar for both drugs, corticotropin caused more severe issues for some patients, leading six to stop treatment.
Who this helps: This helps infants with infantile spasms and their families.
Pilot study of fluzinamide (N-methyl-3-[3-(trifluoromethyl)phenoxy]-1-azetidinecarboxamide) in refractory partial seizures.
1985
Neurology
Donofrio PD, Sackellares C, Madsen JA, Matsuo F, Abou-Khalil B +5 more
Plain English This study looked at a medication called fluzinamide to see if it could help adults with persistent partial seizures that didn't respond to other treatments. Out of 15 participants, four experienced fewer seizures after using fluzinamide for eight weeks, but six had to stop due to side effects like dizziness and headaches. This research matters because it explores a potential new option for patients who haven't found relief from their seizures with existing medications.
Who this helps: This helps patients with difficult-to-treat seizures.
Enhanced production of human gamma-interferon in nylon column-fractionated cell cultures.
1984
Journal of immunology (Baltimore, Md. : 1950)
van Reis R, Lubiniecki AS, Olson RA, Stromberg RR, Madsen JA +1 more
Plain English This study looked at how a specific immune protein, called human gamma-interferon (HuIFN-gamma), is produced in lab-grown white blood cells. Researchers found that using a method called nylon wool column-fractionation boosted the production of this protein by 10 to 15 times, and made it 50 times more effective. This is important because it shows a way to greatly enhance the production of a key immune protein that can be used in treatments for various diseases.
Who this helps: This benefits patients who may receive treatments involving gamma-interferon, particularly those with infections or certain cancers.
Effects of SKF525A, phenobarbital, fasting, and carnitine on the anticonvulsant activity and neurotoxicity of valproate in mice.
1984
Epilepsia
Ater SB, Swinyard EA, Tolman KG, Madsen JA, Matsuo F
Plain English This study looked at how different treatments and conditions affect the ability of the drug valproate to prevent seizures in mice. Researchers found that when mice were pretreated with a specific chemical (SKF525A) or were fasted, valproate worked better at stopping seizures, while using phenobarbital first decreased its effectiveness. This matters because improving valproate's performance could help enhance seizure control in patients.
Who this helps: This helps patients with epilepsy.
Interaction between phenobarbital and thioridazine.
1983
Neurology
Gay PE, Madsen JA
Plain English This study looked at how the medication thioridazine (TDZ) affects the levels of another medication, phenobarbital (PB), in people with intellectual disabilities who are taking both drugs. Researchers found that when patients took 100 to 200 mg of TDZ daily, the amount of PB in their blood was significantly lower than when they took PB alone, meaning PB was less effective because of TDZ. This is important because adjusting PB doses may be necessary for patients also taking TDZ to ensure they receive adequate treatment for their condition.
Who this helps: This helps patients who require both phenobarbital and thioridazine for their treatment plans.
Life span changes in the averaged evoked responses of Down's syndrome and nonretarded persons.
1978
American journal of mental deficiency
Callner DA, Dustman RE, Madsen JA, Schenkenberg T, Beck EC
Plain English This study looked at the brain responses to visual, auditory, and touch stimuli in people with Down's syndrome and those without, from ages 5 to 62. The researchers found that the brain responses, specifically late wave components, were much stronger in individuals with Down's syndrome compared to their peers without the condition. While the responses of those without Down's syndrome decreased as they aged, this reduction was not seen in individuals with Down's syndrome, indicating different brain activity patterns as they grow older.
Who this helps: This benefits researchers and healthcare providers working with individuals with Down's syndrome.
The abdominal angiographic spectrum of tuberous sclerosis.
1976
AJR. American journal of roentgenology
Compton WR, Lester PD, Kyaw MM, Madsen JA
Plain English This study looked at how tuberous sclerosis affects the abdomen and the role of a special imaging test called abdominal angiography in diagnosing the condition. The researchers found that in two infants, the diagnosis of tuberous sclerosis was only made after this imaging was done, revealing kidney issues such as cysts and tumors. This is important because it highlights that using this imaging technique can help identify tuberous sclerosis more accurately in young patients, especially when other symptoms are unclear.
Who this helps: This helps doctors and young patients suspected of having tuberous sclerosis.
Osteomalacia associated with anticonvulsant drug therapy in mentally retarded children.
1975
Pediatrics
Tolman KG, Jubiz W, Sannella JJ, Madsen JA, Belsey RE +2 more
Plain English This study looked at 289 severely disabled children and found that 67 of them had a bone disease called osteomalacia, which is caused by low levels of calcium and phosphorus in the body. All these patients were taking anticonvulsant medications, and those who had been on these drugs for more than ten years had a 75% chance of developing osteomalacia. This is important because the condition leads to weak bones and costly treatments for fractures.
Who this helps: This helps doctors and caregivers of children with epilepsy who are on long-term anticonvulsant medication.