Pocket Medicine 9th Edition High-Yield Clinical Review

Comprehensive vocabulary flashcards covering high-yield definitions, clinical syndromes, diagnostic criteria, and pathological features across multiple internal medicine subspecialties from Pocket Medicine 9th Edition.

Left Axis Deviation (LAD)

An electrical QRS axis beyond $-30^\circ$ (with $S > R$ in lead II). Common etiologies include left ventricular hypertrophy (LVH), left bundle branch block (LBBB), inferior myocardial infarction, and Wolff–Parkinson–White (WPW) syndrome.

Right Axis Deviation (RAD)

An electrical QRS axis beyond $+90^\circ$ (with $S > R$ in lead I). Common etiologies include right ventricular hypertrophy (RVH), pulmonary embolism (PE), chronic obstructive pulmonary disease (COPD; usually not $>+110^\circ$), septal defects, lateral myocardial infarction, and WPW syndrome.

Left Atrial Abnormality (LAA)

An electrocardiographic finding defined by a terminal broad, notched P wave in lead II with duration $>120\text{ ms}$, or a biphasic P wave in lead $V_1$ with a negative terminal deflection lasting $>40\text{ ms}$ and having depth $>1\text{ mm}$.

Right Atrial Abnormality (RAA)

An electrocardiographic finding characterized by a tall, peaked P wave with height $>2.5\text{ mm}$ in lead II, or a positive initial P-wave deflection $>1.5\text{ mm}$ in lead $V_1$.

Epsilon Wave

A small, distinct positive deflection or terminal notch at the end of the QRS complex in the right precordial leads ($V_1$-$V_3$) representing delayed ventricular depolarization, classically pathognomonic for arrhythmogenic right ventricular cardiomyopathy (ARVC).

Pulsus Parvus et Tardus

A weak (parvus) and delayed (tardus) arterial carotid pulse upstroke, serving as a classic physical examination hallmark of severe aortic stenosis.

Austin Flint Murmur

A low-pitched, mid-to-late diastolic apical rumble caused by the regurgitant jet of severe aortic regurgitation impacting the anterior mitral valve leaflet and obstructing forward transmitral flow.

Heyde Syndrome

The clinical triad of severe aortic stenosis, acquired von Willebrand disease (due to high-shear cleavage of von Willebrand factor multimers across the stenotic valve), and gastrointestinal bleeding from angiodysplasias.

Sgarbossa Criteria

ECG diagnostic criteria used to identify acute myocardial infarction in the presence of LBBB or ventricular pacing: concordant ST elevation $\ge 1\text{ mm}$ in any lead ($5\text{ points}$; sensitivity $73\%$, specificity $92\%$); concordant ST depression $\ge 1\text{ mm}$ in leads $V_1$-$V_3$ ($3\text{ points}$; sensitivity $25\%$, specificity $96\%$); or excessively discordant ST elevation $\ge 5\text{ mm}$ in leads with negative QRS complexes ($2\text{ points}$; sensitivity $31\%$, specificity $92\%$).

Kussmaul Sign

A paradoxical lack of inspiratory decrease or an actual increase in the jugular venous pressure (JVP) during inspiration, classic for constrictive pericarditis, restrictive cardiomyopathy, severe right ventricular failure, and right ventricular myocardial infarction.

Beck's Triad

The classic physical examination triad of cardiac tamponade consisting of hypotension, elevated jugular venous pressure with a blunted $y$ descent, and distant (muffled) heart sounds.

Pulsus Paradoxus

An inspiratory drop in systolic blood pressure of $\ge 10\text{ mmHg}$, reflecting exaggerated ventricular interdependence during inspiration seen in cardiac tamponade, severe asthma, COPD, and massive pulmonary embolism.

Acute Limb Ischemia (ALI)

A sudden decrement in limb perfusion threatening tissue viability, classically presenting with the 6 Ps: pain, pallor, poikilothermia, pulselessness, paresthesias, and paralysis.

Alveolar Gas Equation

An equation used to calculate the alveolar partial pressure of oxygen: $P_AO_2 = \left[F_iO_2 \times (760 - 47)\right] - \frac{P_aCO_2}{R}$, which simplifies on room air to $P_AO_2 = 150 - \frac{P_aCO_2}{0.8}$.

Light's Criteria

Diagnostic criteria identifying an exudative pleural effusion if at least one of the following is met: pleural fluid total protein to serum total protein ratio $>0.5$, pleural fluid LDH to serum LDH ratio $>0.6$, or pleural fluid LDH $>\frac{2}{3}$ of the upper limit of normal serum LDH.

Hampton Hump and Westermark Sign

Classic plain radiograph findings of pulmonary embolism: Hampton hump is a peripheral, wedge-shaped opacity abutting the pleura representing pulmonary infarction; Westermark sign is focal oligemia (avascularity) distal to the occluded pulmonary artery.

Lady Windermere Syndrome

Mycobacterium avium complex (MAC) infection leading to right middle lobe and lingula bronchiectasis, classically occurring in elderly women who chronically voluntarily suppress cough and expectoration.

Diffuse Alveolar Damage (DAD)

The histologic hallmark of acute respiratory distress syndrome (ARDS), characterized pathologically by alveolar endothelial and epithelial damage, proteinaceous exudate, hyaline membrane formation, and subsequent interstitial fibrosis.

Achalasia

An esophageal motility disorder caused by degeneration of myenteric ganglion cells leading to impaired lower esophageal sphincter (LES) relaxation and absent esophageal peristalsis; characterized by a 'bird's beak' appearance on barium swallow.

Dieulafoy Lesion

An aberrantly dilated (typically $1$-$3\text{ mm}$) submucosal artery that protrudes through the gastric mucosa, capable of causing massive, recurrent, and life-threatening upper gastrointestinal bleeding in the absence of a distinct ulcer.

Gastric Antral Vascular Ectasia (GAVE)

Ectatic mucosal blood vessels in the gastric antrum displaying longitudinal erythematous stripes, commonly referred to as 'watermelon stomach,' often associated with cirrhosis and systemic sclerosis.

Serum-Ascites Albumin Gradient (SAAG)

A diagnostic metric calculated as $\text{Serum Albumin} - \text{Ascites Albumin}$. A value $\ge 1.1\text{ g/dL}$ indicates portal hypertension with approximately $97\%$ accuracy, while a value $<1.1\text{ g/dL}$ indicates non-portal hypertensive etiologies (e.g., peritoneal carcinomatosis, nephrotic syndrome, infection).

Spontaneous Bacterial Peritonitis (SBP)

An infection of ascitic fluid without an intra-abdominal surgically treatable source, diagnosed by an ascitic polymorphonuclear (PMN) count $\ge 250/\mu\text{L}$. Common pathogens are monomicrobial enteric gram-negative rods (E. coli, Klebsiella) or Streptococcus pneumoniae.

Charcot Triad and Reynolds Pentad

Clinical syndromes of acute cholangitis: Charcot triad consists of right upper quadrant pain, jaundice, and fever/chills; Reynolds pentad adds hypotension/shock and altered mental status.

Serum Anion Gap (AG)

A laboratory calculation defined as $[\text{Na}^+] - ([\text{Cl}^-] + [\text{HCO}_3^-])$. Normal value is approximated by $[\text{albumin}] \times 2.5$ ($\approx 10\text{ to }12\text{ mEq/L}$). An elevation indicates the presence of unmeasured anions (e.g., ketoacids, lactate, toxic metabolites).

Urine Anion Gap (UAG)

An indirect measure of urinary ammonium excretion defined as $(U_{\text{Na}} + U_{\text{K}}) - U_{\text{Cl}}$. A negative value indicates intact renal ammonium secretion (e.g., diarrhea), whereas a positive value suggests impaired renal acidification (e.g., distal renal tubular acidosis, type IV RTA).

Granular ('Muddy Brown') Cast

A urinary sediment microscopic structure composed of sloughed, degenerated renal tubular epithelial cells within a protein matrix, characteristic of acute tubular necrosis (ATN).

Red Blood Cell (RBC) Cast

A urinary cast formed by the entrapment of erythrocytes within Tamm–Horsfall mucoprotein inside the renal tubules, pathognomonic for glomerulonephritis or vasculitis.

White Blood Cell (WBC) Cast

A cylindrical urinary cast embedded with leukocytes indicating tubulointerstitial or glomerular inflammation, classically seen in acute interstitial nephritis (AIN) and pyelonephritis.

Waxy Broad Cast

A wide, dense, refractile urinary sediment cast with sharp indented borders formed in dilated, atrophic tubules, characteristic of advanced chronic kidney disease.

Cystine Crystals

Hexagonal, flat, plate-like crystals identified on microscopic examination of acidic urine, diagnostic of cystinuria resulting from an inherited defect in dibasic amino acid transport.

Struvite Crystals

Magnesium ammonium phosphate crystals with a distinct 'coffin-lid' rectangular prism appearance formed in alkaline urine ($\text{pH} > 7$) in the setting of infection by urea-splitting organisms such as Proteus.

Fractional Excretion of Sodium (FENa)

A clinical calculation evaluating renal tubular sodium handling: $\text{FE}_{\text{Na}} = \frac{U_{\text{Na}} / P_{\text{Na}}}{U_{\text{Cr}} / P_{\text{Cr}}} \times 100\%$. A value $<1\%$ suggests prerenal azotemia, whereas a value $>2\%$ suggests acute tubular necrosis (ATN).

Auer Rod

A linear, needle-like eosinophilic or azurophilic cytoplasmic inclusion composed of fused lysosomes and crystallized myeloperoxidase, diagnostic of myeloid leukemic blasts in acute myeloid leukemia (AML).

Schistocyte

A fragmented red blood cell (helmet cell or crescent-shaped fragment) formed by mechanical shearing across fibrin strands in the microvasculature, characteristic of microangiopathic hemolytic anemias (TTP, HUS, DIC) and mechanical heart valves.

Dacrocyte (Teardrop Cell)

An erythrocyte deformed into a teardrop shape after passing through an infiltrated, fibrotic, or crowded bone marrow, classically seen in primary myelofibrosis, myelophthisic processes, and thalassemias.

Acanthocyte (Spur Cell)

An irregularly spiculed erythrocyte displaying unevenly spaced, thorny projections of variable lengths, classically seen in severe advanced liver disease (spur cell anemia) and abetalipoproteinemia.

Rouleaux Formation

Linear stacking of red blood cells resembling a stack of coins, caused by high concentrations of circulating serum proteins (such as paraproteins in multiple myeloma or Waldenström's macroglobulinemia) reducing cell surface negative repulsive charges.

Spherocyte

A small, spherical red blood cell lacking central pallor caused by loss of cell membrane surface area, classically seen in hereditary spherocytosis and warm autoimmune hemolytic anemia (AIHA).

CRAB Criteria

The clinical defining manifestations of end-organ damage in multiple myeloma: Hypercalcemia (serum Ca $>11\text{ mg/dL}$), Renal insufficiency (serum Cr $>2\text{ mg/dL}$), Anemia ($\text{Hb} <10\text{ g/dL}$ or $>2\text{ g/dL}$ below baseline), and Bone lytic lesions on imaging.

Monoclonal Gammopathy of Undetermined Significance (MGUS)

An asymptomatic plasma cell dyscrasia characterized by a serum M protein $<3\text{ g/dL}$, bone marrow clonal plasma cells $<10\%$, and the absence of end-organ damage (no CRAB criteria), with an annual risk of progression to multiple myeloma of approximately $1\%$.

Smoldering Multiple Myeloma (SMM)

An intermediate asymptomatic plasma cell disorder defined by bone marrow clonal plasma cells of $10\text{ to }60\%$ or serum M protein $\ge 3\text{ g/dL}$ (or urine M protein $\ge 500\text{ mg/24 hr}$) without any myeloma-defining events or CRAB features.

Richter's Transformation

The clinical progression and transformation of chronic lymphocytic leukemia (CLL) or small lymphocytic lymphoma (SLL) into an aggressive high-grade lymphoma, most commonly diffuse large B-cell lymphoma (DLBCL).

Differentiation Syndrome

A potentially fatal systemic complication of all-trans retinoic acid (ATRA) or arsenic trioxide (ATO) therapy in acute promyelocytic leukemia (APL), characterized by fever, pulmonary infiltrates, dyspnea, edema, hypotension, acute kidney injury, and pleural effusions; treated with intravenous dexamethasone.

Osler's Nodes vs. Janeway Lesions

Physical exam manifestations of infective endocarditis: Osler's nodes are painful, tender erythematous nodules located on the pads of digits caused by immune complex deposition; Janeway lesions are nontender, macular, hemorrhagic lesions on the palms and soles caused by septic emboli.

Roth Spots

Oval retinal hemorrhages with pale, white centers composed of coagulated fibrin and platelets, representing an immunologic phenomenon of infective endocarditis.

Erythema Migrans

An expanding erythematous annular cutaneous plaque (often with central clearing, producing a 'bull's-eye' appearance) measuring $\ge 5\text{ cm}$ in diameter, appearing within $1\text{ to }30\text{ days}$ after an Ixodes tick bite as the hallmark of early localized Lyme disease.

Wolff–Chaikoff Effect

The autoregulatory reduction in thyroid hormone synthesis and organification induced by exposure to a large acute load of inorganic iodine, typically serving as a transient protective mechanism.

Jod–Basedow Effect

Iodine-induced hyperthyroidism occurring when a large exogenous iodine load is administered to a patient with underlying autonomous thyroid nodules or latent Graves' disease.

Pituitary Apoplexy

A medical and neurosurgical emergency caused by rapid infarction or hemorrhage into an existing pituitary adenoma, presenting with sudden-onset severe headache, visual field defects, ophthalmoplegia, and acute panhypopituitarism.

Gottron's Papules

Violaceous, erythematous, flat-topped scaly papules located symmetrically over the dorsal surface of metacarpophalangeal (MCP) and interphalangeal (PIP/DIP) joints, pathognomonic for dermatomyositis.

Felty's Syndrome

A rare severe extra-articular triad of long-standing, seropositive rheumatoid arthritis, splenomegaly, and absolute neutropenia, which markedly increases susceptibility to serious bacterial infections.

CREST Syndrome

The classic constellation of clinical findings in limited cutaneous systemic sclerosis (lcSSc): Calcinosis cutis, Raynaud's phenomenon, Esophageal dysmotility, Sclerodactyly, and Telangiectasias; strongly associated with anti-centromere antibodies.

VEXAS Syndrome

A severe, adult-onset autoinflammatory disorder caused by somatic mosaic mutations in the X-linked $UBA1$ gene, characterized by vacuoles in myeloid and erythroid precursors, E1 enzyme deficiency, X-linked inheritance, autoinflammatory features (relapsing chondritis, vasculitis, pulmonary infiltrates), and somatic cytopenias or myelodysplastic syndrome.

Todd's Paralysis

A transient focal neurological deficit (most commonly hemiparesis, monoplegia, or aphasia) following a seizure, which gradually and completely resolves over minutes to hours.

Wallenberg Syndrome (Lateral Medullary Syndrome)

A vascular brainstem syndrome caused by occlusion of the posterior inferior cerebellar artery (PICA) or vertebral artery, presenting with ipsilateral facial sensory loss (CN V), contralateral body hemisensory loss, vertigo, nystagmus, ipsilateral Horner's syndrome, dysarthria, dysphagia, and ataxia.

Albuminocytologic Dissociation

The classic cerebrospinal fluid profile of Guillain–Barré syndrome (GBS) defined by an elevated CSF protein concentration in the presence of a normal leukocyte count ($<10\text{ WBCs/}\mu\text{L}$).