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Myélome Multiple résumé

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résumé détaillé du cours d'hématologie du myélome multiple

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  • June 26, 2024
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  • 2023/2024
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Myélome Multiple
 Définition  Accompagnée ou non d’une sécrétion
Hémopathie maligne d’immunoglobuline monoclonale
Prolifération de plasmocyte malins dans la MO (gammapathie monoclonale)
 Appelé aussi Maladie de Kahler
physiopathologie




• La sécretion des immunoglobulines:
 Ig =2 chaines Lourdes et 2 chaines légéres
 Ch légere L: kappa et lambda
 Ch Lourdes H : alpha, gamma, delta, mu, epsilon
 5 classes d’Ig (isotypes) : Ig A, Ig G, Ig D, IgM, Ig E
 Dépot des Ig au niveau tubulaire : néphropathie myélomateuse (IR)
 Passage des ch légéres au niveau des urines : Proteinurie de surcharge type Bence
Jones

Diagnostic positif : Type de description: Myélome multiple sécrétant
• B- Signes cliniques:
A- Circonstances de découverte: 1- Manifestations osseuses
 Douleurs osseuses ++  Douleurs osseuses: quasi constantes++, souvent inaugurales,
 AEG diffuses (rachis, bassin, cotes..), profondes, permanentes et
 Signes d’anémie résistantes aux antalgiques
 Signes d’insuffisance rénale  Radiculalgie: sciatiques, cruralgies…
 Complication: fracture,  Fractures pathologiques: vértébres, cotes, os long…
compression méullaire,  Masses osseuses: rares, tardives, apré envahissement de s PM
hypercalcémie… molles
 Fortuite 2- syndrome anémique:
 Présent chez ¾ des patients au diagnostic
 Paleur, asthénie, dyspnée d’effort, tachycardie,…
3- Signes d’insuffisance rénale aigúe:
 Oedémes genéralisés, HTA, signes d’OAP..
A Retenir: 4- Altération de l’état géneral:
 Asthénie, anorexie, amaigrissement
 Le myélome doit étre évoquer
5- Signes de complications:
devant toute anémie
 Hypercalcémie: fréquente++
normochrome normocytaire
 fatigue intense, soif intense, syndrome polyuropolydipsique,
et/ou douleurs osseuses chez un  douleur abdominale, constipation
sujet agé  confusion, troubles de rythmes !!!! Urgence
 Infections:
 souvent sévéres
 Germes encapsulés !!!! Urgence
 Syndrome de compression médullaire:
 deficit moteur ou sensitive, troubles sphinctériens !!!! Urgence

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