Sickle Cell Disease
| Sickle Cell Disease | |
|---|---|
| Also Known As | Sickle Cell Anaemia, SCD, Drepanocytosis |
| Type | Inherited Haemoglobin Disorder |
| Affected Organ | Red Blood Cells (Erythrocytes) |
| Cause | Mutation in HBB gene (chromosome 11) |
| Inheritance | Autosomal Recessive |
| Symptoms | Pain crises, anaemia, infections, organ damage |
| Treatment | Hydroxyurea, blood transfusions, bone marrow transplant |
| Prevalence (India) | ~1.4 crore carriers; highest in tribal populations |
| ICD-10 | D57 |
Sickle Cell Disease (SCD) ek samuh hai vanshaanugatik (inherited) raktaanu vikaron ka, jisme haemoglobin — lal raktaanuon (red blood cells) mein oxygen lene wala protein — anuchit roop se banta hai. Is bimari mein lal raktaanu apni normal gol aur lachili avstha kho dete hain aur hasin (sickle) ya dranty ke aakar ke ho jaate hain. Ye kathor aur chipchipe raktaanu nason mein atakkar dard, anaemia, aur gambhir angi kshat (organ damage) ka kaaran bante hain.
Yeh bimari WHO dwara ek pramukh vaisvik swasthya samasya ke roop mein maani gayi hai. India mein yeh bimari vishesh roop se Madhya Pradesh, Chhattisgarh, Odisha, Gujarat aur Jharkhand ke adivasi samudon mein adhik payi jaati hai.
Itihaas (History)
Sickle Cell Disease ka pehli baar vaigyanik varnan 1910 mein American chikitsak Dr. James B. Herrick ne kiya, jab unhone ek West Indian chhatra ke raktaanuon mein anokhe "hason-jaise" (sickle-shaped) raktaanu dekhe.
1949 mein Linus Pauling aur unke sahyogiyon ne yeh siddha kiya ki SCD ek "molecular disease" hai — arthat is bimari ka mool kaaran haemoglobin molecule mein ek specific protein ki galat banawat hai. Yahi khoj molecular biology ke itihaas ki ek aitihasik uplabdhi maani jaati hai.
1956 mein Vernon Ingram ne yaha sthapit kiya ki HBB gene mein sirf ek amino acid ka parivartan — valine ki jagah glutamic acid — is poori bimari ka kaaran hai.
India mein, Sickle Cell Disease ke adhyayan ki shuruaat 1950-60 ke dashak mein hui. Swatantra Bharat mein iski gambhirta ko pahchante hue, sarkar ne haal hi mein National Sickle Cell Anaemia Elimination Mission (2047 tak) ki ghoshna ki hai.
Karan aur Vanshaanugati (Cause and Inheritance)
Sickle Cell Disease HBB gene mein ek point mutation ke kaaran hoti hai, jo chromosome 11 par sthit hai. Is mutation se haemoglobin ka anormal roop — jise HbS (Haemoglobin S) kahte hain — banta hai.
Vanshaanugati ka tarika
Yeh bimari autosomal recessive pattern mein vanshaanugat hoti hai:
- Agar kisi vyakti ko dono maata-pita se anormal gene mile, toh use poori bimari (SCD) hoti hai — ise HbSS ya Sickle Cell Anaemia kehte hain.
- Agar sirf ek gene anormal ho, toh vyakti Sickle Cell Trait (SCT) ka vahak (carrier) hota hai — use generally bimari nahi hoti, lekin woh ise apni santaan mein paas kar sakta hai.
- Do carriers ke bacchon mein 25% sambhavna hoti hai ki unhe poori bimari ho.
Anuprasthit roop (Variants)
- HbSS – Sabse gambhir aur aam roop (Sickle Cell Anaemia)
- HbSC – HbS + HbC mutation; madhyam gambhirta
- HbS beta-thalassemia – HbS + beta-thalassaemia; madhyam se gambhir
- HbSD, HbSE – Kam aam, lekin naidanik mahatva rakhte hain
Rog-vigyan (Pathophysiology)
Samanya haemoglobin (HbA) mein beta-globin chain ke 6ve sthan par glutamic acid hota hai. SCD mein yah badal kar valine ho jaata hai. Yah chhota sa badlav haemoglobin ke guno ko natak badal deta hai:
- Oxygen-rahit (deoxygenated) HbS ane ke baad polymerize ho jaata hai — arthat molecules ek-doosre se jud jaate hain aur rigid, ladder-jaise structures banaate hain.
- Isse red blood cells apna round shape kho deti hain aur hasin (sickle) akar le leti hain.
- Ye rigid, sickle-shaped cells choti raktavahikaaon (capillaries) mein jamdh (vaso-occlusion) karti hain, jisse blood flow ruk jaata hai aur tissues ko oxygen nahi milti.
- Sickle cells normal red blood cells ki tulna mein bahut jaldi toot jaati hain (10–20 din vs. 120 din), jisse chronic haemolytic anaemia hoti hai.
Lakshan (Symptoms)
SCD ke lakshan aam taur par 4–6 mahine ki umra mein shuru hote hain, jab foetal haemoglobin (HbF) adult haemoglobin se badal jaata hai.
Mukhya lakshan
- Dard sankat (Vaso-occlusive Crisis / Pain Crisis) — Sabse aam lakshan. Haath-paon, peeth, seene ya pet mein achanak aur tez dard, jo ghanton se dinon tak reh sakta hai
- Haemolytic Anaemia — Thakaan, paandu (pallor), peeliya (jaundice), saans lene mein takleef
- Dactylitis (Hand-foot Syndrome) — Chote bacchon mein haath aur paon mein sujan; aksar pehla lakshan
- Splenic Sequestration — Pili (spleen) mein raktaanu jam jaate hain, jisse life-threatening anaemia ho sakti hai
- Acute Chest Syndrome — Phepadon mein sickle cells aur infection se chest dard, bukhaar, saanson mein takleef — medical emergency
- Stroke — Dimaag ki nadiyon mein avrodh; bacchon mein bhi ho sakta hai
- Avascular Necrosis — Haddiyon ko khoon na milne se unka naash, khas taur par kaandhon aur kaanch (hips) mein
Aanya complications
- Aankhon ki samasyaen (Retinopathy)
- Gurdon ki kshat (Renal damage)
- Baar baar infections (pneumonia, meningitis)
- Bed-wetting (Enuresis) bachpan mein
- Pulmonary Hypertension
- Leg ulcers
Nidan (Diagnosis)
Janm se pehle (Prenatal Diagnosis)
- Chorionic Villus Sampling (CVS) — Garbhavastha ke 10–12 hafte mein
- Amniocentesis — 15–18 hafte mein
Nawajanma Mein (Newborn Screening)
- Haemoglobin Electrophoresis — Sunhara maanak (gold standard) test
- High-Performance Liquid Chromatography (HPLC) — India mein aaj kal sabse adhik prayog
Baad mein
- Complete Blood Count (CBC)
- Peripheral Blood Smear — Microscope mein sickle cells ki pahchaan
- Haemoglobin HPLC / Electrophoresis
- DNA testing (HBB gene analysis)
Upchaar (Treatment)
SCD ka koi ek ilaj nahi hai, lekin kaafi treatments se rog ko control kiya ja sakta hai:
Dawaaen
- Hydroxyurea — Foetal haemoglobin (HbF) ko badhata hai, dard sankat aur complications kam karta hai; SCD mein sabse mahatvapurn dawa
- Voxelotor (Oxbryta) — HbS polymerisation ko rokti hai
- Crizanlizumab — Sickle cells ke chipakne ko rokta hai
- L-Glutamine — Oxidative stress kam karta hai
- Dard niwarak dawaaen (NSAIDs, opioids dardon mein)
- Antibiotics (infection se bachao ke liye; bacchon mein prophylactic penicillin)
- Folic acid supplements
Khoon chadhaana (Blood Transfusion)
- Acute emergencies mein jeevan raksha ke liye
- Chronic transfusion therapy stroke ke risk wale bacchon mein
- Exchange transfusion — Sickle cells ko normal cells se badla jaata hai
Haddimajja Pratiropan (Bone Marrow / Stem Cell Transplant)
- Abhi tak ka ekmaatr purn ilaaj (cure)
- HLA-matched sibling donor se sabse accha result
- Mainly gambhir cases mein, jahan donor uplabdh ho
Gene Therapy (Naya Kshetra)
- Casgevy (Exa-cel) — CRISPR-Cas9 aadharit gene editing therapy; 2023 mein USA aur UK mein approve hui — SCD ke liye pehli approved gene therapy
- Lentiviral gene addition therapies bhi clinical trials mein
Bharat Mein Sthiti (SCD in India)
India mein Sickle Cell Disease ek gambhir janswasthya samasya hai:
- Bharat mein lagbhag 1.4 crore vahak (carriers) hain
- Har saal lagbhag 30,000–40,000 baache SCD ke saath paida hote hain
- Sabse zyada prabhavit rajya: Madhya Pradesh, Chhattisgarh, Odisha, Gujarat, Maharashtra, Jharkhand
- Adivasi samudon mein prevalence 10–35% tak pahunch jaata hai
- National Sickle Cell Anaemia Elimination Mission — 2047 tak SCD ko khatam karne ka lakshya
Bachav (Prevention)
- Genetic counselling — Vivah se pehle vahak ki jaanch
- Carrier testing — Prabhavit areas mein mass screening
- Prenatal diagnosis — Garbhavati mahilaon mein testing
- Sarkari jagrookta abhiyan, khas taur par adivasi kshetron mein