DIP Episode 32 - Comprehensive Medicine Shelf Review Session 4
Topic
Acute coronary syndromes; GI malabsorption and infections; Electrolyte imbalances; Orthopedics; Pulmonology; Nephrology (RTA, Glomerulonephritis)...
Key Takeaway
Mastering the differential diagnosis of acute organ failure (cardiac vs. renal), recognizing specific infectious etiologies (e.g., Cryptosporidium, Giardia), and recalling the unique pathophysiology and management for complex syndromes like CF, FSGS, and MEN1 is critical for board success.
Episode Notes
Source / episode info
- Episode: 32
- Title: Divine Intervention Episode 32 – Comprehensive Medicine Shelf Review Session 4.
- Published: 2018-05-20
- Source: Episode page
One-liner
This comprehensive review covers acute coronary syndrome management (MI/ACS); systemic GI issues including malabsorption, chronic diarrhea, and specific infections; complex renal physiology (RTA, glomerulonephritis); pulmonary syndromes (emphysema, pneumoconiosis); endocrine disorders (MEN1, hypocalcemia); and hematologic malignancies.
High-yield summary
- Acute Coronary Syndrome: ST elevation requires immediate reperfusion (PCI or thrombolytics). Right-sided infarcts are prone to tearing of the coronary sinus/RV free wall, leading to potential arrhythmias.
- GI Malabsorption: Chronic fat malabsorption (e.g., due to pancreatitis) leads to deficiencies in fat-soluble vitamins (A, D, E, K) and often requires pancreatic enzyme replacement.
- Nephrology: Distinguish between prerenal azotemia (volume depletion) and intrinsic renal failure. Primary hyperphosphatemia is most commonly seen in CKD/ESLD.
- Pulmonary: The classic finding for emphysema is decreased DLCO, while PF Ts show a reduced FEV1/FVC ratio (though GOLD staging focuses on symptoms). Asbestosis causes interstitial fibrosis and pleural plaques.
- Endocrine/GI: MEN1 syndrome involves the "3 Ps": Parathyroid hyperplasia, Pituitary adenoma, and Pancreatic neuroendocrine tumors.
Learning objectives
- Differentiate between various types of acute kidney injury and their underlying causes (e.g., pre-, intrinsic, post-renal).
- Recognize the specific clinical presentations and diagnostic findings associated with common GI malabsorption syndromes.
- Apply knowledge of electrophysiology to manage life-threatening arrhythmias like Torsade de Pointes and AVRT.
- Master the differential diagnosis and management strategies for various forms of interstitial lung disease (e.g., pneumoconiosis, asbestosis).
- Recall the key features and associated endocrine/GI complications of hereditary syndromes (MEN1, CF).
Board exam buzzwords
| Condition | Key Finding | Association | Board Exam Tip |
| Cystic Fibrosis | Sweat chloride test > 60 mmol/L | Pancreatic insufficiency; fat malabsorption | Always consider pancreatic enzyme replacement and Vitamin A/D/E/K deficiencies. |
| Acute Myeloid Leukemia (AML) | Auer rods, MPO positive blasts | Bone marrow biopsy | The presence of Auer rods is pathognomonic for AML. |
| Torsade de Pointes | Prolonged QT interval; hypokalemia/hypomagnesemia | Antiarrhythmic drugs (e.g., quinidine) | Treat with IV Calcium (to stabilize the myocardial membrane). |
| MEN1 Syndrome | "3 Ps": Parathyroid, Pituitary, Pancreas | Multiple endocrine neoplasia type 1 | Remember to screen for hyperparathyroidism and pancreatic masses. |
Rapid review table
| Topic | Key Point | Context | Exam Relevance |
| Acute MI Management | PCI is preferred over thrombolytics if available. | STEMI setting; goal is timely reperfusion. | Know the contraindications to TPA (e.g., recent surgery, bleeding risk). |
| Hyperphosphatemia | Most common cause: CKD/ESLD. | Phosphate balance must be managed in chronic kidney disease. | Phosphate binders are essential and should be taken with meals. |
| Pneumothorax | Tension PTX is a medical emergency requiring immediate decompression. | Sudden onset dyspnea, tracheal deviation (late sign). | Always assess for hemodynamic instability when managing pneumothorax. |
| Electrolyte Imbalance | Hypomagnesemia and hypocalcemia are critical in cardiac care. | Refractory arrhythmias or eclampsia prophylaxis. | Magnesium is often required in addition to calcium/magnesium replacement. |
Board-speak -> diagnosis
| Board-speak / Vignette phrase | Diagnosis / Concept | Why it fits |
| Patient with a right-sided MI develops new arrhythmias. | Right Ventricular Infarction (RVI) | The RV is supplied by the RCA, and infarction can lead to free wall rupture or papillary muscle dysfunction. |
| History of chronic diarrhea + fat malabsorption + deficiency in Vitamin K. | Chronic Pancreatitis/Malabsorption | Fat malabsorption impairs absorption of all fat-soluble vitamins; Vitamin K deficiency leads to coagulopathy (bleeding). |
| Watery, foul-smelling diarrhea after camping trip. | Giardia lamblia or Cryptosporidium | These are common protozoa causing traveler's/camping diarrhea. Giardiasis is often associated with pseudomembranous colitis and malabsorption. |
| Pancytopenia + bone marrow blasts positive for MPO + Auer rods. | Acute Myeloid Leukemia (AML) | AML is characterized by the accumulation of immature myeloid cells, and MPO positivity and Auer rods are classic findings. |
| Patient with bilateral knee pain/diarrhea + PAS+ macrophages in biopsy. | Whipple's Disease (Tropheryma whipplei) | This specific organism causes malabsorption syndrome mimicking celiac disease but has unique histopathology (PAS-positive macrophages). |
| Low blood pressure, JVP increase with inspiration, pericardial knock. | Cardiac Tamponade | These are classic signs of restricted cardiac filling due to fluid accumulation in the pericardium. |
Differential diagnosis / distinguishing features
Pulmonary Edema
| Key Features | Distinguishing Findings | Next Step |
| Cardiogenic PE | Elevated BNP, history of heart failure, S3 gallop. | Diuretics (loop), vasodilators (Nitrates), inotropes (Milrinone). |
| Non-cardiogenic PE | Normal cardiac markers, evidence of pulmonary capillary leak (ARDS). | Treat underlying cause (e.g., sepsis, trauma); supportive care. |
Glomerulonephritis/Nephritic Syndrome
| Key Features | Distinguishing Findings | Next Step |
| Post-Strep GN | Triad: Hematuria, RBC casts, elevated complement (C3). | Supportive care; observation (usually self-limiting). |
| Lupus Nephritis | Associated with SLE; variable patterns. | Immunosuppression (steroids, cyclophosphamide) depending on class/severity. |
| IgA Nephropathy | Recurrent episodes of gross hematuria following URI. | Observation; sometimes anti-C3 or other agents if severe. |
GI Malabsorption Syndromes
| Key Features | Distinguishing Findings | Next Step |
| Whipple's Disease | PAS+ macrophages in villi/tissue. | Diagnosis is clinical and requires biopsy confirmation (difficult). |
| Celiac Disease | Villous atrophy, positive tTG-IgA. | Gluten elimination diet; PP Is for reflux management. |
| Chronic Pancreatitis | Fat malabsorption, steatorrhea. | Enzyme replacement therapy (PERT); dietary modification. |
Management pearls
- TPA Administration: Contraindicated in patients with recent intracranial hemorrhage or active bleeding. PCI is the preferred method of reperfusion if available.
- Hyperphosphatemia Management: Phosphate binders must be taken with meals to bind phosphate effectively, not just at bedtime.
- Right Ventricular Infarct: Monitor for arrhythmias and signs of free wall rupture; these are high-risk complications requiring aggressive monitoring.
- Electrolyte Correction: When treating refractory hypokalemia or hypomagnesemia, always check both levels, as they often coexist and require simultaneous replacement (e.g., MgSO4 + K Cl).
Don't miss
Integration & clinical reasoning
- GI Tract Integration: The GI tract is a site of multiple overlapping syndromes (malabsorption, inflammation, infection), requiring careful correlation between symptoms (diarrhea, weight loss) and specific diagnostic findings (PAS+ macrophages, villous atrophy).
- Cardio/Renal Integration: Acute kidney injury can be caused by both cardiac failure (low CO -> prerenal azotemia) or systemic vasculitis. Always assess volume status and cardiac function first.
- Endocrine/GI Integration: The parathyroid glands and the pancreas are often involved together in hereditary syndromes like MEN1, necessitating a comprehensive endocrine workup.
OMM / COMLEX integration
- Viscerosomatics: The GI tract is highly sensitive to systemic metabolic changes (e.g., hyperphosphatemia affecting calcium/parathyroid function).
- Chapman Points: Not emphasized in this episode.
- OMM/OMT Contraindications: Be aware of the contraindications for thrombolytics (TPA) and antiplatelets, especially in patients with active bleeding or recent surgery.
Concept connections / cross-references
- No explicit cross-references.
High-yield association table
| Condition | Association | Mechanism | Clinical Significance |
| Cystic Fibrosis | Pancreatic insufficiency; fat malabsorption | Defective CFTR protein impairs chloride transport, leading to thick secretions and enzyme blockage. | Requires lifelong PERT and monitoring for vitamin deficiencies. |
| AML | Auer rods, MPO positivity | Myeloid lineage maturation arrest. | Pathognomonic findings that guide diagnosis and prognosis. |
| Cardiac Tamponade | Increased JVP with inspiration; pericardial knock | Fluid accumulation restricts diastolic filling of the heart chambers. | Requires immediate pericardiocentesis for relief. |
| MEN1 Syndrome | Parathyroid hyperplasia, Pituitary adenoma, Pancreatic tumors | Autosomal dominant genetic mutation (RET proto-oncogene). | Mandates screening for multiple endocrine issues; hyperparathyroidism is common. |
Key terms glossary
| Term | Definition | Context | Example |
| Auer Rods | Cylindrical inclusions composed of myeloperoxidase granules. | Bone marrow biopsy in acute leukemia. | Pathognomonic finding for Acute Myeloid Leukemia (AML). |
| Torsade de Pointes (TdP) | A polymorphic ventricular tachycardia associated with prolonged QT interval. | Arrhythmia; often drug-induced or electrolyte-related. | Treatable with IV Calcium and MgSO4. |
| PAS+ Macrophages | Periodic acid–Schiff positive macrophages found in the intestinal mucosa. | Whipple's disease. | Helps distinguish this infection from other causes of malabsorption (e.g., Celiac). |
| Bartter Syndrome | Genetic defect affecting salt reabsorption in the thick ascending limb of the loop of Henle. | Renal tubular disorders; mimics diuretic use. | Characterized by hypokalemia and metabolic alkalosis. |
Study optimization
| Topic | Study Approach | Priority | Resources |
| Electrophysiology/MI | Focus on pathophysiology (RVI, TdP) and immediate management steps. | High | Review cardiac electrophysiology flowcharts; practice MI scenarios. |
| Nephrology/Renal Physiology | Create comparison tables for RTA types and glomerulonephritis patterns. | High | Use mnemonics for GN classification (e.g., "Lupus is everything"). |
| GI Syndromes | Link specific symptoms (steatorrhea, diarrhea) to the underlying cause/pathology (CF, Whipple's). | Medium-High | Review histology slides and classic patient vignettes. |
Question pattern recognition
- The Syndrome Pattern: Identifying a constellation of findings pointing to a single diagnosis (e.g., "3 Ps" for MEN1; low BP + JVP changes for Tamponade).
- The Differential Diagnosis Pattern: Comparing similar conditions based on unique lab/imaging markers (e.g., differentiating the types of glomerulonephritis).
- The Management Algorithm Pattern: Knowing the immediate, life-saving steps in acute crises (e.g., STEMI reperfusion; neutropenic fever workup).
Test yourself
Common mistakes to avoid
Common traps
Original transcript with highlights
Original transcript with highlights
Medicine Keywords C Some MS4
1 Classic presentation of Unstable Angina. Are there ST or troponin elevations in UA? How is UA differentiated from NSTEMI? Treatment of UA. Are fibrinolytics ever indicated? 2 Vitamin deficiencies associated with chronic pancreatitis/some other cause of fat malabsorption. Presentation of these Vitamin deficiencies. Reversing Warfarin toxicity. Genetic disease associated with an increased incidence of skin necrosis with initiation of Warfarin therapy. 3 Watery, extremely foul smelling diarrhea 2 days after returning from a hiking/camping trip. Bug? Diagnostic testing? Pharmacological management? Immunodeficiency disease associated with recurrent infection with this bug? 4 Most common cause of chronic hyperphosphatemia. Treatment strategies in hyperphosphatemia. Electrolytes that spill into the circulation with tumor lysis syndrome/rhabdomyolysis. Refeeding syndrome and phosphate balance. 5 Most common kind of shoulder dislocation. Commonly affected artery/nerve (+ clinical presentation). HY association with a posterior shoulder dislocation. Most common hip dislocation. 6 Cystic fibrosis. Mechanism of inheritance (and genetic mutation, most common). Pathophysiology. Infectious causes of pneumonia by age. Diagnostic testing. Treatment options (by system). Classic newborn presentation. Reproductive problems. Vitamin deficiencies. Classic nasal/rectal findings. Nutrition in cystic fibrosis patients.
7 Severe chest pain at night in a 25 yo F smoker with a history of migraines. Diagnosis? Pathophysiology? Diagnostic testing (provocative)? Treatment? Drugs to avoid? 8 Nasty anal pruritus in a child. Bug? Treatment? 9 65 yo F presents with signs of pancytopenia. Bone marrow biopsy reveals > 20% blasts. Cells are positive for myeloperoxidase. Auer rods are found on biopsy. Diagnosis? Treatment? Potential complication of treatment? 10 Protozoal cause of bloody diarrhea and liver abscesses. Treatment (including specific intraluminal agent in abscesses). What is the bug that increases the risk of cholangiocarcinoma? 11 Causes of hypoxemia with a normal and elevated A-a gradient. Discussion of mechanisms. 12 EKG leads and MI correlations. What should be avoided in a patient with a right sided infarct? Serum markers in an MI. Diagnosing a reinfarction. 13 75 yo M with recurrent infections. CBC is notable for a lymphocyte count of 109k. PE reveals anterior and posterior cervical lymphadenopathy with a blood smear revealing a preponderance of smudge cells. These cells are CD5/19/20/21 +ve. Diagnosis? Preventing tumor lysis syndrome with treatment. 14 Watery diarrhea after consuming undercooked oysters. Bug? Is there a population that could present severely when infected? Treatment strategies. 15 Patient on eclampsia prophylaxis is found by a med student to have ⅖ patellar tendon reflexes. The resident elicited 5/5 reflexes a few hours ago. Diagnosis?
Potential sequelae. Ca balance with this presentation? Protecting the myocardium. Other treatment strategies. Hypomagnesemia and refractory electrolyte replenishment. 16 Cardiogenic vs noncardiogenic pulmonary edema. Treatment of pulmonary edema. Pharmacological improvement of cardiac systolic function. 17 When is a percutaneous coronary intervention indicated for an MI? When should TPA be administered instead? Contraindications to TPA. Treatment of left main stenosis or 3 vessel disease. Acute MI management. 18 Brush border enzyme deficiency in an Asian immigrant that presents with abdominal pain and bloating after consuming cheese. Diagnosis? Pathophysiology? Breath testing. 19 Abdominal discomfort + pancytopenia + bone marrow biopsy revealing a dry tap + cells that stain +ve for Tartrate Resistant Acid Phosphatase + lymphoid cells with fine cytoplasmic projections on histology. Diagnosis? 20 Watery diarrhea and severe vomiting for a 3 day period after consuming fried rice at a Korean restaurant. Bug? 21 Patient with a history of HBV presents with asymmetric neurological deficits + weight loss + severe abdominal pain after meals + ANCA -ve + segmental transmural inflammation detected on renal angiography. Diagnosis? 22 Primary spontaneous pneumothorax (PTX) vs tension PTX. Classic demographic. Common secondary causes. Classic presentation. Auscultation findings (spontaneous vs tension). Management considerations (stable vs unstable, large vs small).
Bottom or top of intercostal space? 23 Emphysema. Risk factors (centriacinar vs panacinar). Pathophysiology. Diagnostic testing. Findings on imaging and PFT testing. Differentiating emphysema from chronic bronchitis. GOLD staging. Treatment by GOLD staging criteria. Key difference b/w asthma and emphysema management. Improving survival. Cor Pulmonale. 24 PFT findings in pneumoconiosis. Asbestosis (histological finding, lung lobes affected, most common lung malignancy, classic XR/thoracentesis presentation of mesothelioma). Caplan syndrome. Pneumoconiosis and increased TB risk. 25 Interstitial infiltrates on CXR + Sputum sample revealing broad based budding yeasts on histology + hemoptysis/productive cough/shortness of breath + Indiana resident + Gray skin lesions. Diagnosis? Treatment? 26-Drugs and Bugs Hospitalized patient with fever and diarrhea. Endocarditis in a patient with prosthetic valves. Fever in an ICU patient with a long history of alcohol abuse. Common causes of drug fever. Drugs that cover MRSA and Pseudomonas. Classic LP/imaging findings in HSV encephalitis. 27-Drugs Antibiotic coverage of Neisserial infection (+ co-treatment). Coverage of most abdominal infections. Simple UTI management. Pyelonephritis treatment. Community acquired pneumonia. RMSF. Syphilis management. Flu coverage. Commonly tested antibiotic side effects. 28 HIV Pharmacology (MOA and common side effects).
Watery diarrhea, meningitis, difficulty swallowing, skin lesions, ring enhancing lesions on MRI (single vs multiple), white non-scrapable oral lesions in an AIDS patient. Treatment of these different disorders. Prophylactic strategies in HIV infection and CD4 thresholds. 29 CML. Pathophysiology (including genetics). Diagnostic testing. Classic CBC findings. Signs and symptoms. Classic patient demographics. Treatment strategies (pharmacology). Differentiating b/w CML and a leukemoid reaction. 30 Next best step in the management of a neutropenic fever. Quick discussion and test worthy considerations with anti-cancer pharmacology. Management of cancer related cachexia. 31 Classic NBME causes of high output heart failure (bone, hematologic). Differential diagnosis of eosinophilia (super HY for the shelf). 32 HIV+ patient with the acute onset of shortness of breath, productive cough, and high fevers. CD4 count is 150. CXR shows a lobar consolidation. What is the most likely offending organism? 33 HIV complications (and associated bugs). Retinitis. Esophagitis. Meningitis. Diarrhea. Bacillary angiomatosis. Ataxia + motor deficits (+ associated MS drug). Histoplasmosis and Coccidioidomycosis prophylaxis. 34 Metabolic acidosis. Causes of a high and a normal anion gap acidosis. Equations for the serum and urine anion gap. Differentiating between diarrhea and RT As as causes of a normal anion gap. RT As (all types and serum findings). Winters Formula.
35 Common causes of a metabolic alkalosis (drugs, diseases, volume depletion). Conn syndrome. 36 Smoker OR Egyptian with history of chronic schistosomiasis OR patient with a history of nephrotic syndrome well controlled with cyclophosphamide presenting with hematuria. Diagnosis? Diagnostic testing? Treatment strategies. HY causes of hemorrhagic cystitis. 37 Indications for dialysis. Complications of uremia. First use syndrome. Amyloidosis in patients on chronic dialysis (involved protein). Abdominal pain, distension, and high fevers in a patient that undergoes regular peritoneal dialysis. 38 Flank pain + CVA tenderness + High fevers + Urgency/Frequency/Dysuria. Diagnosis? Diagnostic testing? What will you find on urinalysis? Treatment options (specific pharmacology, these are HY). Who should get outpatient treatment vs IV antibiotics. Common bugs. 39 Quick overview of renal physiology (and transporter diseases). Quick overview of renal endocrinology. Quick overview, MOA, and commonly tested side effects with the diuretics (including elyte anomalies). HY off-target diuretic uses. Bartter’s, Gitelman’s, and Liddle’s syndromes. 40 FSGS. Classic demographic. Collapsing variant. Electron microscopy findings. Treatment strategies. 41-HY Renal Disorders/RPGN Goodpasture’s syndrome. Post Strep glomerulonephritis. Lupus nephritis. IgA nephropathy. Henoch Schonlein purpura. Granulomatosis with polyangiitis (Wegener’s). EGPA (Churg Strauss). Microscopic polyangiitis.
Discussion of HY associations/presentation. Immunofluorescence patterns. 42 Beck’s triad of cardiac tamponade. Hemodynamic parameters in cardiac tamponade. Treatment strategies. 43 Very basic AVNRT overview (pathophysiology). Basic management strategies. Management of an unstable AVNRT patient (recurring theme). Basic AVRT overview (+WPW, classic EKG finding, treatment). Differentiating b/w orthodromic and antidromic AVRT on EKG. Treatment differences b/w ortho/antidromic AVRT. WPW
Orthodromic vs Antidromic AVRT
Prolonged QT Interval
Torsade de Pointes
44 Causes of a prolonged QT interval (drugs, electrolytes). Torsade de pointes. TdP treatment. Quick antiarrhythmic review. 45 Cardiovascular parameter changes with physiologic manipulation (arrow questions on NBM Es). Examples to consider-> Milrinone administration, NE administration, Hydralazine administration, Nitrate administration. Re-review of murmur physiology. 46 Recent knife wound to the arm + PE revealing a warm, pulsating, palpable arm mass + Echocardiography revealing an EF of 75%. Diagnosis? 47 Japanese female with abdominal pain + > 10 mm Hg difference in systolic B Ps in the arms + 6 mo history of low grade fevers + CBC revealing marked elevations in ESR and CRP. Diagnosis? 48 Pericardial knock on auscultation + JVP increase with inspiration + Reduced EDV on echocardiography. Diagnosis? Key NBME distinguishing feature from cardiac tamponade. 49 Most common cause of death after an MI. Ventricular free wall rupture. Interventricular septal rupture. Papillary muscle rupture. Peri-infarction pericarditis. Dressler’s syndrome. Post-MI medications. 50 Colon cancer screening guidelines (age, modalities). First degree relative diagnosed with colon cancer at 52. Multiple colon polyps in a 22 yo. Colon polyps (+ bone and soft tissue tumors, + brain tumors). Commonly implicated gene mutation. Early colon cancer arising from normal mucosa. Peutz Jeghers Syndrome. 51 Brief overview of GI pharmacology (primarily GERD treatment and H. Pylori therapy).
MO As and unique side effects. 52 35 yo F with a 15 year history of OCP use presenting with RUQ pain. US reveals a well circumscribed hepatic mass. 53 60 yo M presents with a 7 week history of bilateral knee pain and chronic diarrhea. Endoscopy with biopsy of the intestinal mucosa reveals PAS+ macrophages and villous atrophy. A PE is notable a murmur that was not present at the last visit. Diagnosis? Bug? 54 60 yo M presents with a long history of halitosis and difficulty swallowing. A palpable mass is felt in the neck with swallowing. Diagnosis? Diagnostic testing? Treatment? Difficulty swallowing + chest pain radiating to the jaw relieved with nitrates. Diagnosis? Diagnostic testing? Treatment? 55 47 yo F with a history of “relentless DM” presents with a 1 week history of a necrotic, erythematous skin lesion. Diagnosis? Endocrine “syndrome” association. Treatment. 56 Diabetic gastroparesis. Pathophysiology. Treatment strategies. Severe abdominal pain and distension in a 60 yo M septic patient. There is no obstructing lesion identified on abdominal CT. 57 Elevated creatinine and oliguria in a patient with a history of ESLD. Diagnosis? Possible pathophysiology? Associated urine labs? Distinguishing this presentation from prerenal azotemia. Treatment. Hypoxia with standing/walking that improves with recumbency in a patient with a history of ESLD. Diagnosis? 58 Cruise ship gastroenteritis.
Diarrhea with the following associations (AIDS patient, 2 hrs after eating potato salad, daycare, oyster consumer, consuming fried rice, pork consumption, bloody diarrhea from eggs and poultry, common cause of bloody diarrhea in the US). 59 AST/ALT ratios in alcoholic liver disease. Most sensitive serum marker for ROH liver disease. Common hepatotoxic medications (VSTAA, 5). 60 MEN1 syndrome. MEN1 syndrome + jejunal ulcers + unrelenting GERD. Diagnosis? Diagnostic testing? Treatment (pharmacology, 2 options). 61-Miscellaneous Topics Associated autoantibodies in Type 1 and 2 autoimmune hepatitis. UC vs Crohn’s. Hemochromatosis. Complications of cirrhosis/hepatic encephalopathy. GERD management. Pancreatic cancer diagnosis/mgt. Budd Chiari syndrome. Acetaminophen OD.
Practice questions — USMLE style
Question 1 — Electrolyte/Obstetrics
A 47-year-old woman with a history of eclampsia prophylaxis is seen by a resident who notes that her patellar tendon reflexes (deep tendon reflexes) are diminished, scoring 2/5. The patient was previously assessed hours earlier when the reflex score was normal at 5/5. Given this acute change in neurological status and the risk factors associated with her condition, what is the most likely underlying electrolyte derangement?
- A) Hypercalcemia
- B) Hypokalemia
- C) Hypomagnesemia
- D) Hyponatremia
Answer: C. The diminished deep tendon reflexes (hyporeflexia) in a patient receiving eclampsia prophylaxis strongly suggests hypomagnesemia. Magnesium is critical for neuromuscular function, and its deficiency can lead to tetany and decreased reflex activity. While other electrolyte imbalances (like severe hypocalcemia or hypokalemia) can also cause altered reflexes, the clinical context of eclampsia management makes magnesium depletion highly suspect.
Question 2 — Gastroenterology/Endocrinology
A 60-year-old man presents with a chronic history of abdominal pain and bloating after consuming dairy products. He has been diagnosed with steatorrhea and subsequent vitamin deficiencies. Laboratory testing reveals low levels of Vitamin B12, folate, and fat-soluble vitamins (D, E, K). The patient's medical history is notable for recurrent episodes of acute pancreatitis requiring repeated interventions. What is the most likely underlying cause of his malabsorption syndrome?
- A) Celiac disease leading to villous atrophy
- B) Whipple disease causing intestinal inflammation
- C) Chronic pancreatic insufficiency due to exocrine failure
- D) Tropical sprue secondary to gut dysbiosis
Answer: C. The combination of chronic pancreatitis, steatorrhea (fat malabsorption), and deficiencies in multiple vitamins—especially those requiring fat for absorption (A, D, E, K)—is classic for chronic pancreatic insufficiency. When the pancreas fails to produce adequate lipase and other digestive enzymes, fats are not properly digested, leading to generalized malabsorption syndrome.
Question 3 — Infectious Disease
A traveler returns from a coastal area and develops severe, watery diarrhea shortly after consuming undercooked oysters. The patient is immunocompromised due to underlying chronic liver disease. Which organism is the most likely causative agent, and what specific risk factor makes this infection particularly dangerous in this population?
- A) Salmonella species; poor sanitation practices
- B) Clostridium difficile; recent antibiotic use
- C) Vibrio vulnificus; compromised hepatic function
- D) E. coli O157:H7; consumption of raw beef
Answer: C. The constellation of undercooked shellfish, watery diarrhea, and an immunocompromised host (especially with liver disease) points strongly to Vibrio vulnificus. This organism is notorious for causing severe cellulitis and septicemia, particularly in individuals with underlying hepatic impairment due to impaired immune function.
Question 4 — Hematology/Oncology
A 75-year-old man presents with pancytopenia. Bone marrow biopsy reveals a high percentage of blasts (>20%). Cytochemical staining is positive for myeloperoxidase (MPO), and the pathologist notes the presence of Auer rods. Based on these findings, what is the most likely diagnosis, and what critical complication must be monitored during treatment?
- A) Chronic Lymphocytic Leukemia (CLL); thrombocytopenia
- B) Acute Myeloid Leukemia (AML); tumor lysis syndrome
- C) Multiple Myeloma; renal failure
- D) Acute Monoblastic Leukemia (AML); neutropenic fever
Answer: B. The combination of pancytopenia, blasts in the marrow, and positive MPO/Auer rods is highly characteristic of Acute Myeloid Leukemia (AML). A critical complication associated with high-dose chemotherapy used to treat AML is tumor lysis syndrome (TLS), which involves rapid release of intracellular contents (like phosphate, potassium, and nucleic acids) into circulation.
Quick fire review
What are the classic findings on physical exam for cardiac tamponade?
Beck's Triad: Hypotension, Muffled heart sounds, and elevated Jugular Venous Distention (JVD).
Which vitamin deficiency is classically associated with chronic pancreatitis or fat malabsorption?
Vitamin deficiencies include fat-soluble vitamins (A, D, E, K) and potentially B12.
What are the key distinguishing features of a posterior shoulder dislocation?
Associated injury to the axillary nerve and often involves greater tuberosity fracture; suspicion for radial/ulnar nerve damage is also high.
In a patient with eclampsia prophylaxis, what finding suggests hypomagnesemia?
Diminished patellar tendon reflexes (hyporeflexia), as magnesium is necessary for proper neuromuscular function.
What are the classic findings in Peutz Jeghers Syndrome?
Mucocutaneous pigmentation (dark spots) around the mouth, lips, and buccal mucosa, along with an increased risk of GI/colorectal polyps and cancers.
What is the most common cause of hypoxemia when the A-a gradient is normal but elevated?
V/Q mismatching (e.g., atelectasis or pneumonia).
What are the key diagnostic findings for Cystic Fibrosis related to sweat testing and lung function?
High chloride concentration in sweat; obstructive pattern on PF Ts, often with low FEV1/FVC ratio.
Which specific organism causes watery diarrhea after consuming undercooked oysters?
Vibrio parahaemolyticus.
What is the most common genetic mutation associated with Cystic Fibrosis?
Mutations in the CFTR gene (Cystic Fibrosis Transmembrane Conductance Regulator).
Which type of glomerulonephritis presents with a triad of hematuria, hypertension, and edema following a strep infection?
Post-streptococcal glomerulonephritis.
What is the primary mechanism by which loop diuretics cause hypokalemia and metabolic alkalosis?
Increased delivery of Na+ to the distal tubule enhances K+ secretion via increased activity of the Na+/K+-AT Pase pump.
Name two key differential diagnoses for unexplained pancytopenia in a young adult.
Acute leukemia (e.g., AML), aplastic anemia, or myelodysplastic syndrome (MDS).
What is the classic finding on imaging and PF Ts that differentiates emphysema from chronic bronchitis?
Emphysema typically shows hyperinflation/flattened diaphragms; Chronic bronchitis often presents with a more pronounced cough/mucus production history.
Quick recall / Anki-style questions
What are the key diagnostic findings for Cystic Fibrosis related to sweat testing and lung function?
High chloride concentration in sweat; obstructive pattern on PF Ts, often with low FEV1/FVC ratio.
Which specific organism causes watery diarrhea after consuming undercooked oysters?
Vibrio parahaemolyticus.
What is the most common genetic mutation associated with Cystic Fibrosis?
Mutations in the CFTR gene (Cystic Fibrosis Transmembrane Conductance Regulator).
Which type of glomerulonephritis presents with a triad of hematuria, hypertension, and edema following a strep infection?
Post-streptococcal glomerulonephritis.
What is the primary mechanism by which loop diuretics cause hypokalemia and metabolic alkalosis?
Increased delivery of Na+ to the distal tubule enhances K+ secretion via increased activity of the Na+/K+-AT Pase pump.
Name two key differential diagnoses for unexplained pancytopenia in a young adult.
Acute leukemia (e.g., AML), aplastic anemia, or myelodysplastic syndrome (MDS).
What is the classic finding on imaging and PF Ts that differentiates emphysema from chronic bronchitis?
Emphysema typically shows hyperinflation/flattened diaphragms; Chronic bronchitis often presents with a more pronounced cough/mucus production history.