Hospital Medicine Unplugged

In this episode of Hospital Medicine Unplugged, we unpack mixed connective tissue disease—recognize the overlap syndrome hiding between lupus, scleroderma, and myositis, and aggressively monitor the pulmonary complications that drive morbidity and mortality.

MCTD is defined by high-titer anti-U1 RNP antibodies plus overlapping connective tissue disease features. The hallmark clues:

Raynaud’s is often the earliest manifestation, and scleroderma-type findings help distinguish MCTD from lupus in anti-RNP–positive patients.

The major threat is pulmonary disease:

PAH remains the leading cause of death, making routine pulmonary surveillance essential:

Treatment depends on organ involvement:

For MCTD-associated PAH:

Key pearl: many patients achieve remission or stable disease, but up to one-quarter eventually evolve into a more defined connective tissue disease—most commonly systemic sclerosis or lupus.

We close with the system moves: don’t dismiss Raynaud’s plus swollen hands as “nonspecific,” screen aggressively for ILD and PAH, trend pulmonary function over time, and recognize that lung complications—not arthritis—determine long-term outcomes in MCTD.

The antibody may define the diagnosis, but the lungs define the prognosis.

In this episode of Hospital Medicine Unplugged, we break down myelodysplastic syndromes—recognize the unexplained cytopenias, understand the modern molecular classification, and risk-stratify patients before progression to AML.

The WHO 2022 classification shifted MDS from a purely morphologic disease to a genetically informed diagnosis. New entities include MDS with SF3B1 mutation, isolated del(5q), and biallelic TP53-mutated MDS, one of the highest-risk subtypes. Blast categories are now simplified into low blasts, increased blasts-1 (5–9%), and increased blasts-2 (10–19%).

Diagnosis requires:

Bone marrow biopsy remains essential, and unexplained cytopenias with clonal mutations that don’t meet MDS criteria are now classified as CCUS.

Risk stratification centers on the IPSS-R, incorporating:

Lower-risk disease focuses on symptom control and transfusion reduction. Higher-risk disease focuses on delaying AML transformation and improving survival.

For anemia in lower-risk MDS:

For higher-risk disease:

Key pearl: responses to hypomethylating agents are delayed—patients often need at least 4–6 cycles before declaring failure.

The only curative therapy is allogeneic stem cell transplantation:

We close with the system moves: investigate unexplained macrocytic anemia and cytopenias early, integrate molecular testing into diagnosis and prognosis, avoid prematurely stopping hypomethylating therapy, and refer transplant-eligible patients before progression to AML.

Not every pancytopenia is “just aging marrow”—sometimes it’s a clonal stem-cell disorder announcing itself before leukemia arrives.

In this episode of Hospital Medicine Unplugged, we unpack cardiac amyloidosis—recognize the red flags hiding inside “routine HFpEF,” diagnose ATTR noninvasively, and start disease-modifying therapy before restrictive physiology becomes irreversible.

ATTR cardiac amyloidosis is far more common than previously recognized, especially in older adults with HFpEF and increased LV wall thickness. Key clues include voltage-mass discordance—thick ventricles on echo with surprisingly low ECG voltage—and extracardiac findings like carpal tunnel syndrome, lumbar spinal stenosis, trigger finger, or biceps tendon rupture that may precede diagnosis by years.

Echo pearls:

The modern diagnostic breakthrough is nuclear imaging:

Never skip monoclonal protein screening:

This distinction matters because AL amyloidosis is a hematologic emergency requiring plasma-cell–directed therapy.

Treatment changed dramatically with tafamidis:

Acoramidis joined the field in 2024 as another TTR stabilizer with similar benefits.

Heart failure management is different here:

Key pearl: anticoagulate atrial fibrillation regardless of CHA₂DS₂-VASc score due to extreme thromboembolic risk.

We close with the system moves: when HFpEF doesn’t quite fit—especially with unexplained LVH, neuropathy, orthopedic history, or voltage-mass discordance—think amyloid early, order monoclonal protein studies plus PYP scanning, and start disease-modifying therapy before fibrosis and restrictive failure dominate the trajectory.

Not all HFpEF is hypertensive heart disease—sometimes the diagnosis is hiding in the carpal tunnel scar.

In this episode of Hospital Medicine Unplugged, we tackle sarcoidosis—recognize the classic presentations, screen aggressively for silent organ involvement, and treat the patients at highest risk for irreversible damage or sudden death.

Diagnosis requires three things: compatible clinical presentation, non-caseating granulomas, and exclusion of alternative granulomatous disease like TB, fungal infection, or malignancy. Some syndromes are classic enough to skip biopsy, including Löfgren syndrome (bilateral hilar adenopathy, erythema nodosum, arthritis, fever) and lupus pernio. Most hospitalized patients, though, need tissue confirmation—typically via EBUS-guided transbronchial needle aspiration for intrathoracic lymphadenopathy.

Once diagnosed, the mission shifts to multisystem screening:

Cardiac sarcoidosis is a major killer and can present with AV block, ventricular arrhythmias, syncope, or unexplained cardiomyopathy. Neurosarcoidosis can cause cranial neuropathies, meningitis, seizures, or spinal cord disease—both require aggressive recognition and treatment.

Not all sarcoidosis needs therapy. Treat when there’s risk of organ damage, death, or severe symptoms:

Treatment backbone:

Steroid-sparing therapy matters early:

Cardiac sarcoidosis often needs more than immunosuppression:

Key inpatient pearls:

We close with the system moves: build a standardized sarcoidosis screening pathway, default to ECG + pulmonary testing + ophthalmology evaluation at diagnosis, escalate rapidly to cardiac imaging when red flags appear, and initiate steroid-sparing therapy early for chronic disease.

Granulomas are only the start—screen every organ, respect cardiac sarcoidosis, and treat before inflammation becomes permanent fibrosis.

In this episode of Hospital Medicine Unplugged, we unpack autoimmune encephalitis—recognize the red flags early, treat aggressively before antibody results return, and support the long recovery arc that often extends years beyond discharge.

We open with the bedside reality: autoimmune encephalitis is frequently missed because it masquerades as psychiatry, infection, toxic-metabolic disease, or unexplained delirium. The key clue is rapid progression over days to weeks with combinations of psychiatric symptoms, memory loss, seizures, dyskinesias, autonomic instability, speech dysfunction, or decreased consciousness.

Diagnosis starts clinically—not with waiting for antibodies. The Graus 2016 framework emphasizes a tiered approach using history, exam, MRI, EEG, CSF, and syndrome recognition. For anti-NMDA receptor encephalitis, probable diagnosis requires rapid onset (<3 months) of at least four major symptom groups (psychiatric/cognitive dysfunction, speech dysfunction, seizures, movement disorder, decreased consciousness, autonomic dysfunction) plus abnormal EEG or CSF findings—or three symptom groups with a teratoma identified. Normal MRI does not exclude disease.

Core diagnostic workup:

The critical management principle: do not delay immunotherapy waiting for antibodies. Seronegative autoimmune encephalitis exists, testing sensitivity is imperfect, and treatment delay worsens outcomes.

First-line therapy builds the immunotherapy backbone:

Evidence increasingly favors combination therapy over isolated treatment. Meta-analysis data from >1,500 patients showed therapeutic apheresis alone or combination regimens (steroids + IVIG or all three modalities) had the best odds of favorable recovery. Failure to initiate immunotherapy within 30 days was associated with markedly worse outcomes.

If first-line treatment stalls:

Rituximab deserves special attention—it not only improves refractory disease but also substantially lowers relapse risk, with studies demonstrating nearly a six-fold reduction in recurrence odds.

ICU pearls you don’t want to miss:

Tumor search is not optional:

When present, tumor removal is treatment and significantly affects relapse risk and neurologic recovery.

Recovery is where expectations need recalibration. Improvement is often slow, nonlinear, and incomplete despite “good” functional scores. About 75–81% of anti-NMDAR patients eventually achieve substantial recovery, but progress may continue for 24–36 months. The largest gains occur in the first 6 months, yet persistent deficits in memory, language, fatigue, emotional health, and social functioning are extremely common.

One of the most important recent observations: autoimmune encephalitis patients continue improving well beyond the timeline expected for infectious encephalitis. Critically ill autoimmune cases may show functional gains throughout the entire first year, reinforcing the importance of prolonged rehab and longitudinal neurologic support.

Relapse prevention matters:

Pediatric disease brings additional nuance:

We close with the system moves:

Fast recognition, early immunotherapy, aggressive escalation, and long-term rehabilitation—autoimmune encephalitis is treatable, but only if you think about it before the antibodies come back.

In this episode of Hospital Medicine Unplugged, we unpack acute interstitial nephritis (AIN)—a frequently overlooked cause of acute kidney injury (AKI) driven largely by medications, immune reactions, and systemic diseases.

We start with epidemiology clinicians should recognize. AIN accounts for roughly 15–27% of kidney biopsies performed for AKI and about 2.8% of all kidney biopsies overall. Among biopsies done specifically for acute renal failure, AIN represents ~13.5% of cases. Drug-induced AIN dominates the landscape, responsible for 70–90% of biopsy-proven cases, and its incidence appears to be rising—particularly in older adults, where polypharmacy and underutilization of kidney biopsy can obscure the diagnosis.

Next we break down the most common causes.

We then explore the immunologic pathophysiology. AIN is primarily driven by T-cell–mediated hypersensitivity reactions (Type IV) targeting tubular antigens or drug-related antigens processed by tubular epithelial cells. However, IgE-mediated mast cell activation (Type I hypersensitivity) may also contribute in some cases. The resulting interstitial inflammation and edema can rapidly progress to fibrosis, making early recognition and treatment critical for renal recovery.

Histologically, AIN is characterized by interstitial inflammatory infiltrates composed mainly of lymphocytes, macrophages, plasma cells, and sometimes eosinophils, along with tubulitis, interstitial edema, and tubular injury. Glomeruli are typically normal, while interstitial fibrosis and tubular atrophy signal chronicity and worse prognosis. Variants include granulomatous AIN and rare entities like IgM-positive plasma cell tubulointerstitial nephritis.

Clinically, the classic triad of fever, rash, and eosinophilia is now uncommon—present in fewer than 10–15% of patients. Instead, most patients present with nonspecific symptoms such as malaise, nausea, or asymptomatic AKI. Non-oliguric AKI is typical, often accompanied by mild proteinuria and tubular dysfunction.

Diagnosis relies on clinical suspicion, medication review, and supportive laboratory findings. Urinalysis may show sterile pyuria and white blood cell casts, which are more specific for AIN. Eosinophiluria, historically emphasized, is neither sensitive nor specific. Ultimately, kidney biopsy remains the gold standard when the diagnosis is uncertain.

We also review emerging biomarkers that may transform diagnosis. Urinary CXCL9, an interferon-γ–induced chemokine involved in lymphocyte recruitment, has shown excellent diagnostic performance with AUC values up to ~0.94 for AIN detection. Additional candidate biomarkers include urinary TNF-α, IL-9, kidney injury molecule-1 (KIM-1), and soluble C5b-9, reflecting tubular injury and immune activation.

Management begins with immediate withdrawal of the offending drug. If kidney function does not improve within 5–7 days, corticosteroid therapy is often initiated, typically prednisone ~40–60 mg daily (~0.8 mg/kg). Evidence suggests that early steroid therapy—within the first 1–2 weeks—improves renal recovery, while prolonged treatment beyond several weeks offers little additional benefit.

Finally, we discuss prognosis. About 76% of patients achieve some degree of kidney recovery within six months, with complete recovery in roughly half of steroid-treated cases. However, chronic kidney disease remains common, and long-term studies suggest up to 39% of patients may eventually develop end-stage kidney disease. Poor outcomes are associated with delayed diagnosis, prolonged drug exposure, interstitial fibrosis on biopsy, dialysis requirement, and older age.

The key takeaway: acute interstitial nephritis is a common, often medication-related cause of AKI that requires high clinical suspicion, prompt withdrawal of offending drugs, and early consideration of corticosteroids to prevent irreversible kidney damage.

In this episode of Hospital Medicine Unplugged, we break down celiac disease—from epidemiology and modern diagnostic strategies to life-threatening complications and emerging therapies beyond the gluten-free diet.

We start with epidemiology clinicians should know. The global prevalence of celiac disease is ~1.4% based on serology and ~0.7% with biopsy confirmation. Incidence rates are ~17 per 100,000 person-years in women and ~8 per 100,000 in men, with a female-to-male ratio of ~1.8. Importantly, about 70% of cases remain undiagnosed, the so-called “celiac iceberg.” Over recent decades, incidence has increased substantially, rising from <2 per 100,000 annually in the 1980s to >20 per 100,000 in many regions today.

Next we unpack genetic susceptibility and immune pathogenesis. Nearly all patients carry HLA-DQ2 or HLA-DQ8, but these genes alone are insufficient—~40% of the population carries them, yet only 1–3% develop disease, highlighting the role of environmental triggers and additional genetic factors. Gluten exposure leads to immune activation against deamidated gliadin peptides, resulting in small-intestinal inflammation, villous atrophy, and malabsorption.

We then highlight how the clinical presentation has shifted. The classic picture of malabsorption with diarrhea and weight loss is now less common in adults. Instead, non-classical presentations predominate, including iron-deficiency anemia, osteoporosis, abnormal liver enzymes, infertility, and nonspecific GI symptoms. Diarrhea still occurs in ~40–50% of patients, but many adults present with extraintestinal manifestations or even asymptomatic disease.

We also review celiac crisis, a rare but life-threatening presentation requiring hospitalization. Patients develop severe diarrhea, dehydration, electrolyte disturbances, metabolic acidosis, and profound malnutrition. Management requires intravenous fluids, electrolyte replacement, aggressive nutritional support, and sometimes corticosteroids, alongside initiation of a strict gluten-free diet, which leads to improvement in the vast majority of patients.

Diagnosis begins with serologic testing. IgA tissue transglutaminase (tTG-IgA) is the preferred initial screening test, with ~93–95% sensitivity and ~95–98% specificity, and total IgA should be measured simultaneously to detect IgA deficiency. Endomysial antibody testing has near-100% specificity and can confirm the diagnosis. In adults, upper endoscopy with small-bowel biopsy remains the diagnostic standard, demonstrating intraepithelial lymphocytosis, crypt hyperplasia, and villous atrophy.

We then discuss major complications clinicians must recognize. These include osteoporosis, infertility, neurologic complications, hyposplenism, and small-bowel adenocarcinoma. One of the most serious is enteropathy-associated T-cell lymphoma (EATL)—a rare but aggressive malignancy with very poor survival, often arising from type 2 refractory celiac disease.

Refractory celiac disease (RCD) occurs when symptoms and villous atrophy persist despite ≥12 months of strict gluten-free diet.

Management still centers on the gluten-free diet, which leads to symptomatic improvement in ~70% of patients within two weeks, though histologic healing can take months and may remain incomplete in many adults.

Finally, we explore the future of therapy. While diet remains the cornerstone, multiple pharmacologic strategies are in development, including gluten-degrading enzymes, intestinal barrier modulators like larazotide, transglutaminase inhibitors, immune-modulating therapies targeting IL-15, microbiome-based therapies, and even gene-edited wheat with reduced immunogenic gluten.

The takeaway: celiac disease is common, frequently underdiagnosed, and increasingly recognized through non-classical presentations. With improved diagnostics, recognition of severe complications like refractory disease and lymphoma, and a rapidly evolving therapeutic pipeline, management of celiac disease is entering a new era beyond diet alone.

In this episode of Hospital Medicine Unplugged, we tackle polypharmacy and deprescribing—how to recognize problematic medication overload, quantify its harms, and apply structured, patient-centered strategies to safely reduce medication burden.

We begin with definitions that shape clinical practice. Polypharmacy is most commonly defined as the use of ≥5 medications, though definitions vary. Importantly, not all polypharmacy is harmful. “Appropriate polypharmacy” occurs when medications are evidence-based and optimized, while “problematic polypharmacy” arises when medications lack clear benefit or when harms outweigh benefits. Deprescribing is the systematic process of identifying and discontinuing medications whose risks exceed benefits, aligned with a patient’s goals, function, life expectancy, and preferences.

Next we review how common this problem is. Polypharmacy affects 30–40% of community-dwelling older adults, 40–50% of hospitalized older adults, and up to 90% of nursing home residents. Roughly 20–50% of older adults take at least one potentially inappropriate medication (PIM). Risk rises with multimorbidity, female sex, lower socioeconomic status, and each additional chronic disease increases the odds of polypharmacy by nearly 90%.

We then quantify the clinical consequences.

A key driver is the prescribing cascade, where a drug causes side effects that are treated with additional medications. Classic examples include:

To identify problematic medications, we review major screening tools.

We then walk through a practical deprescribing framework. A common 5-step protocol includes:

List all medications and indications

Assess overall risk of drug-related harm

Identify drugs eligible for discontinuation

Prioritize those with highest harm and lowest benefit

Implement tapering and monitor for withdrawal or recurrence

Certain medications require careful tapering to prevent withdrawal syndromes, including benzodiazepines, beta-blockers, antidepressants, corticosteroids, opioids, antiepileptics, clonidine, baclofen, and proton pump inhibitors.

We highlight high-yield deprescribing targets.

We also discuss patient and system barriers. Interestingly, 92% of older adults say they would stop at least one medication if their doctor recommended it, though many fear symptom recurrence or believe medications are necessary.

Finally, we examine solutions that work. Pharmacist-led medication reviews reduce inappropriate medications by 21–35% and lower readmissions, while clinical decision support tools in electronic health records can flag high-risk medications and prompt deprescribing conversations.

The takeaway: polypharmacy is common, harmful, and often reversible. Using structured frameworks, validated screening tools, and shared decision-making, clinicians can safely deprescribe and improve medication safety—especially for older adults with multimorbidity.

In this episode of Hospital Medicine Unplugged, we break down primary hyperparathyroidism (PHPT)—from epidemiology and pathophysiology to modern imaging, surgical indications, and evolving medical therapies.

We start with who gets PHPT and how often it occurs. The condition affects ~0.8–0.9% of the general population, with an incidence of 4–6 cases per 10,000 person-years. It is 2.5 times more common in women, and incidence rises sharply with age, reaching ~12 cases per 10,000 person-years in people aged 70–79. There are also racial disparities, with higher incidence reported in Black populations.

Next we unpack the causes of PHPT. About 80% of cases result from a single parathyroid adenoma, 10–11% from multiple adenomas, <10% from four-gland hyperplasia, and <1% from parathyroid carcinoma. Some cases occur in genetic syndromes such as MEN1, MEN2A, MEN4, and hyperparathyroidism–jaw tumor syndrome.

Clinically, up to 80% of patients in resource-rich settings are now asymptomatic, discovered incidentally through routine lab testing. When symptoms occur, they reflect hypercalcemia and PTH excess, including kidney stones, osteoporosis, gastrointestinal symptoms, and neuromuscular complaints. Many patients also report fatigue, depression, or cognitive symptoms, though the direct causal relationship remains debated.

We then cover complications that drive treatment decisions. PHPT can lead to osteoporosis, fragility fractures, nephrolithiasis, and reduced kidney function. There is also growing evidence linking PHPT with hypertension, left ventricular hypertrophy, and increased cardiovascular risk, though cardiovascular benefit from surgery remains uncertain.

Diagnosis starts with biochemical confirmation—elevated calcium with inappropriately elevated PTH. Imaging is not for diagnosis but for surgical planning. The usual first-line localization strategy combines neck ultrasound with dual-tracer sestamibi scanning, while second-line imaging options such as 4D-CT or 18F-fluorocholine PET/CT offer extremely high sensitivity—up to ~94–99%.

Management centers on parathyroidectomy, which is the definitive treatment. Current guidelines recommend surgery for patients with:

For patients who are not surgical candidates, several medications help control complications:

We also explore normocalcemic primary hyperparathyroidism, an increasingly recognized condition defined by elevated PTH with normal calcium after excluding secondary causes. It may represent an early or milder form of PHPT, often with more multiglandular disease and slightly lower surgical cure rates.

Finally, we highlight critical diagnostic pitfalls and emerging research. Distinguishing PHPT from familial hypocalciuric hypercalcemia (FHH) is essential—FHH shows lifelong mild hypercalcemia and a calcium-to-creatinine clearance ratio <0.01 and does not require surgery. Meanwhile, advanced imaging, genetic testing in younger patients, and combination pharmacotherapy are shaping the future of PHPT care.

The bottom line: primary hyperparathyroidism is common, increasingly detected incidentally, and highly treatable—especially when clinicians recognize surgical indications, use modern imaging strategies, and tailor therapy to complications and patient risk.

In this episode of Hospital Medicine Unplugged, we break down ANCA-associated vasculitis (AAV)—granulomatosis with polyangiitis (GPA), microscopic polyangiitis (MPA), and eosinophilic granulomatosis with polyangiitis (EGPA)—focusing on modern epidemiology, complement-driven pathophysiology, ANCA serotypes, and the rapidly evolving treatment landscape.

We start with epidemiology clinicians should recognize. The global incidence of AAV is ~17 per million person-years, with a prevalence near 198 per million. In the United States, incidence is roughly 3.3 per 100,000, with a prevalence of ~42 per 100,000. Subtype incidence varies: GPA (~9–15/million), MPA (~6/million), and EGPA (~2/million). The mean age at diagnosis is about 61, and rates have increased over the past decades due to greater recognition and widespread ANCA testing.

Next we unpack the pathophysiology that changed therapy. Complement activation—particularly the alternative pathway—plays a central role. C5a drives neutrophil activation and recruitment, creating an inflammatory amplification loop. Low C3 levels correlate with more aggressive disease and worse renal outcomes. This mechanistic insight led to avacopan, an oral C5a receptor antagonist that provides a glucocorticoid-sparing approach to treatment.

We then highlight the importance of ANCA serotype classification. Patients are increasingly categorized by PR3-ANCA vs MPO-ANCA, not just clinical phenotype.

We also review EGPA as a distinct entity. Only ~40% of patients are ANCA-positive. Two clinical subsets exist:

Diagnosis relies on modern ANCA testing and organ evaluation. PR3- and MPO-specific immunoassays are now the preferred screening tests, with ~90–95% sensitivity for active GPA/MPA and >95% specificity. Renal disease occurs in 70–80% of GPA/MPA, typically as pauci-immune necrotizing crescentic glomerulonephritis, while pulmonary disease ranges from nodules and cavitation (PR3) to interstitial lung disease (MPO) and diffuse alveolar hemorrhage.

Management has evolved dramatically. First-line induction therapy combines glucocorticoids with rituximab or cyclophosphamide, with rituximab preferred for most patients—especially PR3-ANCA or relapsing disease. Reduced-dose steroid regimens are now recommended after trials like PEXIVAS, which showed lower infection risk without worse renal outcomes.

We also cover key modern therapies.

For maintenance therapy, rituximab is now the preferred agent, outperforming azathioprine in major trials such as MAINRITSAN and RITAZAREM. Maintenance typically continues 2–4 years, especially in PR3-ANCA patients with high relapse risk.

We finish with EGPA-specific treatment advances. IL-5 pathway inhibitors have transformed care, including mepolizumab and the newer benralizumab, which improve remission rates and allow significant glucocorticoid reduction.

The bottom line: AAV management has shifted toward precision medicine—ANCA serotype classification, complement-targeted therapy, steroid-sparing strategies, and biologic maintenance treatments—dramatically improving survival and long-term outcomes.