USMLE Step 1 & 2 Hypertension and Vascular Disease

Last updated: May 2, 2026

Hypertension and Vascular Disease questions are one of the highest-leverage areas to study for the USMLE Step 1 & 2. This guide breaks down the rule, the elements you need to recognize, the named traps that catch most students, and a memory aid that scales to test day. Read it once, then practice the same sub-topic adaptively in the app.

The rule

Most adult hypertension is primary (essential) and is managed by stage-based lifestyle and pharmacologic therapy targeting BP <130/80 mm Hg in most adults. Secondary hypertension should be actively pursued when the presentation is atypical: onset before age 30 or after age 55, resistant hypertension on three drugs including a diuretic, abrupt worsening, or specific physical/lab clues. The cause-specific clue (hypokalemia, abdominal bruit, episodic spells, snoring/obesity, cushingoid features, leg-arm BP discrepancy) points to a single high-yield diagnosis on Step 2 CK.

Elements breakdown

Primary (essential) hypertension

Sustained BP elevation without identifiable secondary cause; ~90% of adult HTN.

  • Onset typically age 30-55
  • Family history common
  • Gradual progression
  • No triggering exam/lab clue
  • Responds to standard stepwise therapy

Common examples:

  • Middle-aged adult with obesity and BP 148/92

Renovascular hypertension

Renal artery stenosis causing renin-angiotensin-driven HTN.

  • Abdominal/flank bruit
  • Acute kidney injury after ACE inhibitor
  • Asymmetric kidney size on ultrasound
  • Atherosclerotic in older adults
  • Fibromuscular dysplasia in young women

Common examples:

  • Young woman with resistant HTN and string-of-beads on CT angiography

Primary hyperaldosteronism (Conn syndrome)

Autonomous aldosterone secretion from adrenal adenoma or bilateral hyperplasia.

  • Resistant HTN with hypokalemia
  • Metabolic alkalosis
  • Elevated aldosterone-to-renin ratio
  • Adrenal mass on imaging
  • Often normokalemic on screening

Common examples:

  • BP 168/104 with K 3.0 despite ARB

Pheochromocytoma

Catecholamine-secreting tumor of adrenal medulla or paraganglia.

  • Episodic HTN with headache
  • Palpitations and diaphoresis
  • Elevated plasma metanephrines
  • Adrenal mass on CT/MRI
  • Associated with MEN2, VHL, NF1

Common examples:

  • Spells of headache, sweating, BP surges to 220/120

Obstructive sleep apnea

Repetitive nocturnal upper airway collapse driving sympathetic surges.

  • Loud snoring and witnessed apneas
  • Daytime somnolence
  • Obese male with thick neck
  • Resistant or nocturnal HTN
  • Confirmed by polysomnography

Common examples:

  • BMI 38 man with morning headaches and BP 152/96

Coarctation of the aorta

Congenital narrowing distal to left subclavian artery.

  • Upper-extremity HTN
  • Diminished/delayed femoral pulses
  • Arm-leg BP gradient >20 mm Hg
  • Rib notching on chest x-ray
  • Associated with bicuspid aortic valve and Turner syndrome

Common examples:

  • Adolescent with high arm BP and weak femoral pulses

Cushing syndrome / exogenous steroids

Glucocorticoid excess causing HTN via mineralocorticoid effect and vascular sensitization.

  • Central obesity and moon facies
  • Purple striae and easy bruising
  • Hyperglycemia and proximal weakness
  • Elevated cortisol on screening
  • Often iatrogenic from chronic steroids

Common examples:

  • Patient on chronic prednisone for sarcoidosis with new HTN

Drug- or substance-induced HTN

Reversible HTN from identifiable exogenous agent.

  • NSAIDs, decongestants, OCPs
  • Stimulants (cocaine, amphetamines)
  • Erythropoietin, calcineurin inhibitors
  • Licorice (apparent mineralocorticoid excess)
  • Acute alcohol withdrawal

Common examples:

  • Recent cocaine use with BP 200/115 and chest pain

Common patterns and traps

The Resistant-HTN Pivot

Whenever a vignette describes BP still elevated on three antihypertensives at maximum tolerated doses (one of which is a diuretic), the question is almost never 'add a fourth drug.' It is asking you to identify a secondary cause. Look for the planted clue in the labs, exam, or history.

A correct answer reads 'Plasma aldosterone-to-renin ratio,' 'Renal artery duplex ultrasound,' or 'Plasma free metanephrines' rather than another antihypertensive.

The Buzzword-to-Diagnosis Map

USMLE plants single high-yield phrases that map one-to-one to a secondary cause: 'string of beads' = fibromuscular dysplasia, 'episodic headache and diaphoresis' = pheochromocytoma, 'rib notching' = coarctation, 'moon facies and striae' = Cushing, 'snoring with daytime sleepiness' = OSA. The trap is when two clues coexist and you must pick the dominant one.

A correct answer names the disease that matches the buzzword exactly, even if a more common diagnosis is also plausible from the demographics.

The ACE-Inhibitor AKI Tell

A patient started on lisinopril (or any ACEi/ARB) who develops a >30% creatinine bump within days has bilateral renal artery stenosis until proven otherwise. Efferent arteriole vasodilation drops glomerular pressure in kidneys that depend on angiotensin II for perfusion.

A correct answer is 'bilateral renal artery stenosis' or 'renal artery duplex ultrasound,' not 'acute interstitial nephritis' or 'contrast nephropathy.'

The Hypokalemia-Without-Diuretic Clue

Spontaneous hypokalemia (K <3.5) in a hypertensive patient NOT on a thiazide or loop diuretic is primary hyperaldosteronism until proven otherwise. The metabolic alkalosis and inappropriate kaliuresis seal it.

A correct answer is 'measure plasma aldosterone-to-renin ratio,' not 'replete potassium and recheck.'

The Episodic-Spells Trap

Vignettes describing paroxysmal headache, palpitations, diaphoresis, and BP surges between normal baselines point to pheochromocytoma. The trap distractor is 'panic disorder' or 'hyperthyroidism' — both can mimic, but neither produces the BP surges to >200 mm Hg with a discrete adrenal mass.

A correct answer is 'plasma fractionated metanephrines' (most sensitive screen), not 'TSH' or 'reassurance and SSRI.'

How it works

Imagine Mr. Alvarez, 42, who comes in with BP 172/108 despite full doses of lisinopril, amlodipine, and hydrochlorothiazide. His K is 2.9 and HCO3 is 31 — that hypokalemic metabolic alkalosis on three drugs is the textbook trigger to stop calling this essential HTN. You order a plasma aldosterone-to-renin ratio, which comes back markedly elevated, and adrenal CT shows a 1.8 cm left adenoma. The rule in action: resistant HTN plus a specific lab clue (hypokalemia) routes you immediately to primary hyperaldosteronism rather than escalating to a fourth antihypertensive. The wrong move on the exam is to add spironolactone empirically without pursuing the diagnosis — Step 2 CK rewards identifying the secondary cause, not just lowering the number.

Worked examples

Worked Example 1

Which of the following is the most appropriate next step in evaluation?

  • A Add spironolactone 25 mg daily and recheck BP in 4 weeks
  • B Measure plasma aldosterone concentration and plasma renin activity ✓ Correct
  • C Order renal artery duplex ultrasonography
  • D Refer for overnight polysomnography

Why B is correct: Mr. Pereira has resistant hypertension (BP above goal on three drugs at maximum tolerated dose, one a diuretic) plus spontaneous hypokalemia and metabolic alkalosis without a kaliuretic trigger. This is the classic profile for primary hyperaldosteronism, and the screening test of choice is the plasma aldosterone-to-renin ratio. A ratio >20 with aldosterone >15 ng/dL warrants confirmatory testing and adrenal imaging.

Why each wrong choice fails:

  • A: Adding spironolactone empirically may lower BP and correct the hypokalemia, but it masks the underlying diagnosis and prevents definitive workup. On Step 2 CK, identifying the secondary cause precedes empirical fourth-drug therapy. (The Resistant-HTN Pivot)
  • C: Renovascular disease is on the differential for resistant HTN, but the absence of an abdominal bruit, normal creatinine, and (most importantly) spontaneous hypokalemia point to an aldosterone problem rather than a renin-driven one. Renovascular HTN typically gives high renin AND high aldosterone. (The Buzzword-to-Diagnosis Map)
  • D: OSA is a legitimate cause of resistant HTN, but the patient's BMI is 27 and the vignette gives no snoring, witnessed apneas, or daytime sleepiness. Polysomnography would not explain the hypokalemia and alkalosis. (The Buzzword-to-Diagnosis Map)
Worked Example 2

Which of the following is the most likely underlying diagnosis?

  • A Acute interstitial nephritis
  • B Bilateral atherosclerotic renal artery stenosis ✓ Correct
  • C Cholesterol embolization syndrome
  • D Fibromuscular dysplasia

Why B is correct: A >30% rise in creatinine within days of starting an ACE inhibitor in a patient with diffuse atherosclerotic disease points to bilateral renal artery stenosis. The kidneys depend on angiotensin II–mediated efferent arteriolar tone to maintain glomerular filtration; ACE inhibition drops perfusion pressure and precipitates AKI. The faint abdominal bruit is supportive.

Why each wrong choice fails:

  • A: AIN typically presents with rash, fever, eosinophilia, and white cell casts or sterile pyuria, usually weeks after exposure to a culprit drug (often a beta-lactam or PPI). The clean urinalysis and the temporal link to ACEi initiation argue against it. (The ACE-Inhibitor AKI Tell)
  • C: Cholesterol embolization can cause AKI in a vasculopath, but it requires a precipitating event (catheterization, surgery, anticoagulation) and usually shows livedo reticularis, blue toes, or eosinophiluria. None of those are present.
  • D: Fibromuscular dysplasia does cause renovascular HTN but classically affects young women in their 20s-40s, not a 68-year-old smoker with diffuse atherosclerosis. Atherosclerotic RAS fits the demographics far better. (The Buzzword-to-Diagnosis Map)
Worked Example 3

Which of the following is the most appropriate initial diagnostic test?

  • A 24-hour ambulatory blood pressure monitoring
  • B Echocardiogram with bubble study
  • C Plasma fractionated metanephrines ✓ Correct
  • D Urine drug screen for amphetamines

Why C is correct: The triad of episodic headache, palpitations, and diaphoresis with paroxysmal severe HTN is classic for pheochromocytoma. Plasma fractionated metanephrines have the highest sensitivity (~96-100%) and are the preferred initial screen in patients with high pretest probability. Confirmatory imaging with adrenal CT or MRI follows a positive screen.

Why each wrong choice fails:

  • A: Ambulatory BP monitoring would document the episodic surges but does not identify the cause. With a clinically obvious paroxysmal pattern and BP of 224/128 during a spell, the diagnostic priority is biochemical screening for catecholamine excess. (The Episodic-Spells Trap)
  • B: An echocardiogram evaluates cardiac structure and function but offers nothing for the diagnosis of episodic catecholamine surges. There is no clinical suggestion of valvular disease, intracardiac shunt, or heart failure.
  • D: Stimulant intoxication can mimic pheochromocytoma, and a drug screen is reasonable in some settings, but recurrent stereotyped spells over months with spontaneous resolution and no social-history clues fit an endogenous catecholamine source far better. Skipping the high-yield screen for a low-yield one would be the trap. (The Episodic-Spells Trap)

Memory aid

ABCDE for secondary HTN triggers: Accuracy of BP / Apnea (OSA), Bruits / Bad kidneys (renovascular), Catecholamines / Cushing / Coarctation, Drugs / Diet (NSAIDs, cocaine, licorice), Endocrine (aldosterone, thyroid, parathyroid).

Key distinction

Primary hyperaldosteronism vs renovascular HTN — both cause resistant HTN, but Conn gives suppressed renin with high aldosterone, while renovascular disease gives high renin AND high aldosterone (and often a bruit or asymmetric kidneys).

Summary

Treat HTN by stage, but pivot to a secondary workup the moment the presentation is young, resistant, abrupt, or paired with a specific clue.

Practice hypertension and vascular disease adaptively

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Frequently asked questions

What is hypertension and vascular disease on the USMLE Step 1 & 2?

Most adult hypertension is primary (essential) and is managed by stage-based lifestyle and pharmacologic therapy targeting BP <130/80 mm Hg in most adults. Secondary hypertension should be actively pursued when the presentation is atypical: onset before age 30 or after age 55, resistant hypertension on three drugs including a diuretic, abrupt worsening, or specific physical/lab clues. The cause-specific clue (hypokalemia, abdominal bruit, episodic spells, snoring/obesity, cushingoid features, leg-arm BP discrepancy) points to a single high-yield diagnosis on Step 2 CK.

How do I practice hypertension and vascular disease questions?

The fastest way to improve on hypertension and vascular disease is targeted, adaptive practice — working questions that focus on your specific weak spots within this sub-topic, getting immediate feedback, and revisiting items you missed on a spaced-repetition schedule. Neureto's adaptive engine does this automatically across the USMLE Step 1 & 2; start a free 7-day trial to see your sub-topic mastery climb in real time.

What's the most important distinction to remember for hypertension and vascular disease?

Primary hyperaldosteronism vs renovascular HTN — both cause resistant HTN, but Conn gives suppressed renin with high aldosterone, while renovascular disease gives high renin AND high aldosterone (and often a bruit or asymmetric kidneys).

Is there a memory aid for hypertension and vascular disease questions?

ABCDE for secondary HTN triggers: Accuracy of BP / Apnea (OSA), Bruits / Bad kidneys (renovascular), Catecholamines / Cushing / Coarctation, Drugs / Diet (NSAIDs, cocaine, licorice), Endocrine (aldosterone, thyroid, parathyroid).

What's a common trap on hypertension and vascular disease questions?

Treating resistant HTN as essential and adding a fourth drug

What's a common trap on hypertension and vascular disease questions?

Missing the AKI-after-ACE clue for bilateral renal artery stenosis

Related USMLE Step 1 & 2 sub-topics

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