Nephrology · USMLE Step 1 and Step 2

Hypertensive Nephrosclerosis song

Hypertensive Nephrosclerosis - Pathology & Management, as a song. Hear the short teaser here. The full song is on YouTube and Spotify.

Hypertensive Nephrosclerosis

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Key points in this song10

Hypertensive nephrosclerosis is the leading cause of end-stage renal disease in African Americans, driven by chronic systemic hypertension causing afferent arteriolar hyalinosis and hyperplastic arteriolosclerosis.
The hallmark pathological finding is "onion-skin" hyperplastic arteriolosclerosis in malignant hypertension, with fibrinoid necrosis of arteriolar walls leading to thrombotic microangiopathy.
Benign nephrosclerosis presents with slowly progressive proteinuria (typically subnephrotic, <1 g/day), mild azotemia, and hyaline casts on urinalysis in the setting of long-standing hypertension.
Malignant (accelerated) hypertension is defined by BP >180/120 mmHg with end-organ damage; renal manifestations include hematuria, proteinuria, rapidly rising creatinine, and papilledema on fundoscopy.
The APOL1 gene variants (G1 and G2 alleles) significantly increase the risk of hypertensive nephrosclerosis and FSGS in individuals of African descent, independent of blood pressure control.
Renal biopsy in benign nephrosclerosis shows glomerulosclerosis, tubular atrophy, interstitial fibrosis, and afferent arteriolar hyalinosis — distinguishing it from primary glomerulonephritis.
First-line antihypertensives for hypertensive nephrosclerosis with proteinuria are ACE inhibitors or ARBs, which reduce intraglomerular pressure by dilating the efferent arteriole.
Target blood pressure in hypertensive nephrosclerosis with CKD and proteinuria >500 mg/day is <130/80 mmHg per JNC and ACC/AHA guidelines.
Malignant hypertension requires IV labetalol, nicardipine, or sodium nitroprusside with a goal of reducing MAP by no more than 25% in the first hour to avoid ischemic injury.
Bilateral small, echogenic kidneys on renal ultrasound in a hypertensive patient with CKD indicate chronic nephrosclerosis with irreversible fibrosis and loss of corticomedullary differentiation.