Friedreich's sign

In medicine, Friedreich's sign is the exaggerated drop in diastolic central venous pressure seen in constrictive pericarditis (particularly with a stiff calcified pericardium) and manifested as abrupt collapse of the neck veins or marked descent of the central venous pressure waveform.

The sign is named after Nikolaus Friedreich.^[1]

References

↑ Friedreich's sign at Who Named It?

Eponymous medical signs for circulatory system

Heart disease

Heart murmur	Systolic heart murmur: benign paediatric heart murmur (Still's murmur) Diastolic heart murmur: pulmonic regurgitation (Graham Steell murmur) aortic insufficiency (Austin Flint murmur) carey coombs murmur mitral regurgitation (Presystolic murmur)

Aortic insufficiency	Watson's water hammer pulse/Corrigan pulse De Musset's sign Duroziez's sign Müller's sign Quincke's sign Austin Flint murmur Mayne's sign

Other endocardium	endocarditis: Roth's spot Janeway lesion/Osler's node Bracht-Wachter bodies

Pericardium	cardiac tamponade/pericardial effusion: Beck's triad Ewart's sign

Other	rheumatic fever: Anitschkow cell Aschoff body EKG (Osborn wave) angina pectoris (Levine's sign) Gallavardin phenomenon

Vascular disease

Arterial	aortic aneurysm (Cardarelli's sign, Oliver's sign) pulmonary embolism (McConnell's sign) radial artery sufficiency (Allen's test) pseudohypertension (Osler's sign) thrombus (Lines of Zahn) Adson's sign arteriovenous fistula (Nicoladoni sign)

Venous	Friedreich's sign Caput medusae Kussmaul's sign DVT Bancroft's sign Homans sign Lisker's sign Louvel's sign Lowenberg's sign Peabody's sign Pratt's sign Rose's sign Trendelenburg test superior vena cava syndrome (Pemberton's sign)

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