๐Ÿฉธ Chapter 516 ยท Nonclonal Polycythemia (Secondary & Congenital)

Nelson Textbook of Pediatrics 22nd Edition | Nonclonal polycythemia: secondary (hypoxia: CHD, lung disease, sleep apnea, high altitude, EPO-secreting tumors) and congenital (high O2 affinity hemoglobin, EPOR mutation, VHL/Chuvash polycythemia, 2,3-DPG deficiency). Relative polycythemia (dehydration). Diagnosis: high EPO in secondary, normal/low in congenital. Management: treat underlying cause, phlebotomy only for hyperviscosity.

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๐Ÿ“‹ 30 Clinical Scenarios โ€” Nonclonal Polycythemia (Secondary & Congenital)

๐Ÿ“‡ Highโ€‘Yield Review Cards (Nonclonal Polycythemia)

๐Ÿฉบ Clinical Recognition: Nonclonal Polycythemia

Select a presentation for diagnostic clues and management.

๐Ÿ“‹ Stepwise Management of Nonclonal Polycythemia

๐Ÿ”‘ Key Principles โ€” Nelson Chapter 516
โ€ข Nonclonal polycythemia = secondary (acquired, โ†‘EPO) or congenital (genetic defects).
โ€ข High EPO: hypoxia (CHD, lung disease, sleep apnea, high altitude), EPO-secreting tumors (renal, cerebellar, hepatic), high-affinity Hb (low P50), Chuvash polycythemia (VHL mutation).
โ€ข Normal/low EPO: EPOR mutation (erythrocytosis with low EPO), 2,3-DPG deficiency (left shift).
โ€ข Relative polycythemia: Dehydration, diuretics, burns โ†’ treat underlying cause.
โ€ข Phlebotomy: Only for hyperviscosity symptoms. Avoid in high-affinity Hb (worsens O2 delivery).

    โšก Reflex Prompts โ€” Clinical Decisions in Nonclonal Polycythemia

    ๐Ÿ“– Summary: Nonclonal Polycythemia โ€” Nelson Chapter 516