DiGeorge syndrome
- Overview
- Theory
- Diagnosis
- Management
- Follow up
- Resources
Treatment algorithm
Please note that formulations/routes and doses may differ between drug names and brands, drug formularies, or locations. Treatment recommendations are specific to patient groups: see disclaimer
birth to 4 months
monitoring and stabilization
Treatment involves managing complications. Because complications occur at predictable ages in a patient's life, management should be tailored to the age of the child. Newborns should be assessed for specific conditions common at this age, and treatment should be targeted accordingly.
Treatment of infants is characterized by stabilizing life-threatening abnormalities and characterizing the extent of disease.[52]Óskarsdóttir S, Boot E, Crowley TB, et al. Updated clinical practice recommendations for managing children with 22q11.2 deletion syndrome. Genet Med. 2023 Mar;25(3):100338. https://www.gimjournal.org/article/S1098-3600(22)01018-8/fulltext http://www.ncbi.nlm.nih.gov/pubmed/36729053?tool=bestpractice.com
surgical repair after stabilization
Treatment recommended for ALL patients in selected patient group
About 80% of patients have congenital heart disease.[47]Marino B, Digilio MC, Toscano A, et al. Anatomic patterns of conotruncal defects associated with deletion 22q11. Genet Med. 2001;3:45-8. http://www.ncbi.nlm.nih.gov/pubmed/11339377?tool=bestpractice.com [92]Goldmuntz E. 22q11.2 deletion syndrome and congenital heart disease. Am J Med Genet C Semin Med Genet. 2020 Mar;184(1):64-72. http://www.ncbi.nlm.nih.gov/pubmed/32049433?tool=bestpractice.com Conotruncal anomalies such as interrupted aortic arch type B and truncus arteriosus are the most characteristic, but tetralogy of Fallot, ventricular septal defect, and others are also common.[92]Goldmuntz E. 22q11.2 deletion syndrome and congenital heart disease. Am J Med Genet C Semin Med Genet. 2020 Mar;184(1):64-72. http://www.ncbi.nlm.nih.gov/pubmed/32049433?tool=bestpractice.com [93]Goldmuntz E, Clark BJ, Mitchell LE, et al. Frequency of 22q11 deletions in patients with conotruncal defects. J Am Coll Cardiol. 1998:32;492-98. https://www.sciencedirect.com/science/article/pii/S0735109798002599 http://www.ncbi.nlm.nih.gov/pubmed/9708481?tool=bestpractice.com
Cardiac anomalies must be managed as appropriate, and echocardiography performed to define the cardiac anatomy and plan surgical repair.[52]Óskarsdóttir S, Boot E, Crowley TB, et al. Updated clinical practice recommendations for managing children with 22q11.2 deletion syndrome. Genet Med. 2023 Mar;25(3):100338. https://www.gimjournal.org/article/S1098-3600(22)01018-8/fulltext http://www.ncbi.nlm.nih.gov/pubmed/36729053?tool=bestpractice.com
Infants with cardiac disease secondary to DiGeorge syndrome are managed as other infants with the same cardiac anatomy; although they may be at increased risk of postoperative infection this does not seem to impact length of stay or mortality.[95]McDonald R, Dodgen A, Goyal S, et al. Impact of 22q11.2 deletion on the postoperative course of children after cardiac surgery. Pediatr Cardiol. 2013;34:341-7. http://www.ncbi.nlm.nih.gov/pubmed/22864648?tool=bestpractice.com
supportive specialty care
Treatment recommended for ALL patients in selected patient group
Managed by adaptive feeding approaches in consultation with nutritionists, occupational therapists, feeding specialists, and orthodontists. Options include specialized nipples, prosthetics, and frequent burping. Additional options include prosthetic devices that may improve palatal function without surgical intervention.
feeding therapy
Treatment recommended for ALL patients in selected patient group
Children in this age group routinely have feeding difficulties that may not be associated with cleft palate. First-line therapy is modified feeding approaches to ease feeding, including changing nipples, using bottle feeding if breastfeeding is inadequate, thickening feeds, or changing formulas. Second-line therapy may be required and usually involves placing a percutaneous gastrostomy tube. This should be considered if a child does not gain weight despite other feeding interventions.
calcium + calcitriol
Treatment recommended for ALL patients in selected patient group
Present in up to 60% of patients.[96]Rayannavar A, Levitt Katz LE, Crowley TB, et al. Association of hypocalcemia with congenital heart disease in 22q11.2 deletion syndrome. Am J Med Genet A. 2018 Oct;176(10):2099-103. https://pmc.ncbi.nlm.nih.gov/articles/PMC6467273 http://www.ncbi.nlm.nih.gov/pubmed/30277015?tool=bestpractice.com Often becomes less problematic as the child matures.[60]Ryan AK, Goodship JA, Wilson DI, et al. Spectrum of clinical features associated with interstitial chromosome 22q11 deletions: a European collaborative study. J Med Genet. 1997;34:798-804. http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1051084&blobtype=pdf http://www.ncbi.nlm.nih.gov/pubmed/9350810?tool=bestpractice.com
Managed by oral calcium and vitamin D (calcitriol) supplementation as necessary.[52]Óskarsdóttir S, Boot E, Crowley TB, et al. Updated clinical practice recommendations for managing children with 22q11.2 deletion syndrome. Genet Med. 2023 Mar;25(3):100338. https://www.gimjournal.org/article/S1098-3600(22)01018-8/fulltext http://www.ncbi.nlm.nih.gov/pubmed/36729053?tool=bestpractice.com Calcium levels should be corrected for albumin, or ionized calcium measurements used.
Doses should be titrated to reach low-normal calcium levels.
Calcium levels can usually be corrected orally, but if there are significant symptoms, such as tetany, seizure, or prolonged QT interval, intravenous correction is indicated.
If long-term correction is required, urine should be checked to maintain 24-hour urine calcium <300 mg.
Primary options
calcium gluconate: consult specialist for guidance on oral dose
and
calcitriol: 0.04 to 0.08 micrograms/kg orally once daily
hydrochlorothiazide
Treatment recommended for SOME patients in selected patient group
Hypercalciuria is the major complication of treatment for hypocalcemia. If urinary calcium is >300 mg in 24 hours, dose of calcium and calcitriol must be reduced or hydrochlorothiazide may be added to reduce urine calcium excretion if required.
Primary options
hydrochlorothiazide: 0.5 to 2 mg/kg/day orally given in 1-2 divided doses
intravenous calcium for any episode of tetany, seizure, or prolonged QT interval
Treatment recommended for SOME patients in selected patient group
Calcium levels can usually be corrected orally, but if there are significant symptoms, such as tetany, seizure, or prolonged QT interval, intravenous correction is indicated.
Up to 60% of patients have hypocalcemia, and hypocalcemic seizures are common in neonates.[60]Ryan AK, Goodship JA, Wilson DI, et al. Spectrum of clinical features associated with interstitial chromosome 22q11 deletions: a European collaborative study. J Med Genet. 1997;34:798-804. http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1051084&blobtype=pdf http://www.ncbi.nlm.nih.gov/pubmed/9350810?tool=bestpractice.com [96]Rayannavar A, Levitt Katz LE, Crowley TB, et al. Association of hypocalcemia with congenital heart disease in 22q11.2 deletion syndrome. Am J Med Genet A. 2018 Oct;176(10):2099-103. https://pmc.ncbi.nlm.nih.gov/articles/PMC6467273 http://www.ncbi.nlm.nih.gov/pubmed/30277015?tool=bestpractice.com Hypocalcemia often becomes less problematic as the child matures.[60]Ryan AK, Goodship JA, Wilson DI, et al. Spectrum of clinical features associated with interstitial chromosome 22q11 deletions: a European collaborative study. J Med Genet. 1997;34:798-804. http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1051084&blobtype=pdf http://www.ncbi.nlm.nih.gov/pubmed/9350810?tool=bestpractice.com
Calcium levels should be corrected for albumin, or ionized calcium measurements used. Infusion should be adjusted to maintain serum calcium of about 8.0 mg/dL.
Intravenous calcium is highly irritating if extravasation occurs, and infusion that is too rapid can cause cardiac arrest. A central line should be used if possible, and bicarbonate and phosphate are incompatible and must be infused in another line. Cardiac monitoring is strongly recommended when giving intravenous calcium.
Primary options
calcium gluconate: consult specialist for guidance on intravenous dose
levothyroxine
Treatment recommended for ALL patients in selected patient group
Up to 20% of patients have thyroid disease of some type.[108]Bassett AS, Chow EW, Husted J, et al. Clinical features of 78 adults with 22q11 deletion syndrome. Am J Med Genet A. 2005;138A:307-13. https://pmc.ncbi.nlm.nih.gov/articles/PMC3127862 http://www.ncbi.nlm.nih.gov/pubmed/16208694?tool=bestpractice.com Thyroid function (TSH and free T4) should be assessed at birth, and replacement therapy started accordingly. Dose is adjusted at 4- to 6-week intervals according to serum TSH.
Primary options
levothyroxine: children <3 months of age:10-15 micrograms/kg orally once daily initially, adjust dose according to response and serum TSH; children ≥3 months of age: 8-10 micrograms/kg orally once daily initially, adjust dose according to response and serum TSH
specialist consultation
Treatment recommended for ALL patients in selected patient group
Ultrasound should be performed to identify renal hypoplasia or obstruction. Specialty consultation is needed for management.
infants and toddlers (4 months to 5 years)
continued monitoring
Treatment involves managing complications. Because complications occur at predictable ages in a patient's life, management should be tailored to the age of the child. Infants and toddlers should be assessed for specific conditions common at this age, and treatment should be targeted accordingly.
monitoring and possible surgery
Treatment recommended for ALL patients in selected patient group
About 80% of patients have congenital heart disease.[47]Marino B, Digilio MC, Toscano A, et al. Anatomic patterns of conotruncal defects associated with deletion 22q11. Genet Med. 2001;3:45-8. http://www.ncbi.nlm.nih.gov/pubmed/11339377?tool=bestpractice.com [92]Goldmuntz E. 22q11.2 deletion syndrome and congenital heart disease. Am J Med Genet C Semin Med Genet. 2020 Mar;184(1):64-72. http://www.ncbi.nlm.nih.gov/pubmed/32049433?tool=bestpractice.com Conotruncal anomalies such as interrupted aortic arch type B and truncus arteriosus are the most characteristic, but tetralogy of Fallot, ventricular septal defect, and others are also common.[93]Goldmuntz E, Clark BJ, Mitchell LE, et al. Frequency of 22q11 deletions in patients with conotruncal defects. J Am Coll Cardiol. 1998:32;492-98. https://www.sciencedirect.com/science/article/pii/S0735109798002599 http://www.ncbi.nlm.nih.gov/pubmed/9708481?tool=bestpractice.com [94]Van Mierop LH, Kutsche LM. Cardiovascular anomalies in DiGeorge syndrome and importance of neural crest as a possible pathogenetic factor. Am J Cardiol. 1986;58:133-7. http://www.ncbi.nlm.nih.gov/pubmed/3728313?tool=bestpractice.com Patients who have undergone surgical intervention for congenital heart disease require long-term follow-up; further surgical intervention is often required in later childhood and adolescence.[52]Óskarsdóttir S, Boot E, Crowley TB, et al. Updated clinical practice recommendations for managing children with 22q11.2 deletion syndrome. Genet Med. 2023 Mar;25(3):100338. https://www.gimjournal.org/article/S1098-3600(22)01018-8/fulltext http://www.ncbi.nlm.nih.gov/pubmed/36729053?tool=bestpractice.com
For children with congenital heart disease those with 22q11.2 deletion may be more likely to need dialysis post cardiac surgery, and have a greater risk of postoperative infection; but this does not seem to increase mortality or length of intensive care or hospital stay.[95]McDonald R, Dodgen A, Goyal S, et al. Impact of 22q11.2 deletion on the postoperative course of children after cardiac surgery. Pediatr Cardiol. 2013;34:341-7. http://www.ncbi.nlm.nih.gov/pubmed/22864648?tool=bestpractice.com
supportive speciality care
Treatment recommended for ALL patients in selected patient group
Managed by adaptive feeding approaches in consultation with nutritionists, occupational therapists, feeding specialists, and orthodontists. Options include specialized nipples, prosthetics, and frequent burping. Additional options include prosthetic devices that may improve palatal function without surgical intervention.
surgery
Treatment recommended for SOME patients in selected patient group
Surgical repair is required for frank clefts and submucous clefts.[52]Óskarsdóttir S, Boot E, Crowley TB, et al. Updated clinical practice recommendations for managing children with 22q11.2 deletion syndrome. Genet Med. 2023 Mar;25(3):100338. https://www.gimjournal.org/article/S1098-3600(22)01018-8/fulltext http://www.ncbi.nlm.nih.gov/pubmed/36729053?tool=bestpractice.com Patients who have only palatal insufficiency may not need surgical correction, although if speech therapy fails to adequately improve diction and intelligibility, there are surgical options to improve this. Speech outcomes are improved by surgical intervention to improve oronasal closure.[97]Filip C, Matzen M, Aukner R, et al. Superiorly based pharyngeal flap for treatment of velopharyngeal insufficiency in patients with 22q11.2 deletion syndrome. J Craniofac Surg. 2013;24:501-4. http://www.ncbi.nlm.nih.gov/pubmed/23524725?tool=bestpractice.com There are multiple possible procedures to accomplish this. One report has found repair with pharyngeal flaps to be superior to sphincter pharyngoplasty.[109]Ysunza A, Pamplona MC, Molina F, et al. Surgical planning for restoring velopharyngeal function in velocardiofacial syndrome. Int J Pediatr Otorhinolaryngol. 2009;73:1572-5. http://www.ncbi.nlm.nih.gov/pubmed/19720406?tool=bestpractice.com Another systematic review found modest evidence that obstructive pharyngoplasties were superior to the less obstructive fat injection or palatoplasty. Obstructive sleep apnea is a complication of any of these procedures and should be monitored for following surgery.[110]Spruijt NE, Reijmanhinze J, Hens G, et al. In search of the optimal surgical treatment for velopharyngeal dysfunction in 22q11.2 deletion syndrome: a systematic review. PLoS ONE. 2012;7:e34332. http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0034332 http://www.ncbi.nlm.nih.gov/pubmed/22470558?tool=bestpractice.com
sulfamethoxazole/trimethoprim + intravenous immune globulin
Treatment recommended for ALL patients in selected patient group
Patients with demonstrated immune dysfunction should be referred to an immunologist.[55]Mustillo PJ, Sullivan KE, Chinn IK, et al. Clinical practice guidelines for the immunological management of chromosome 22q11.2 deletion syndrome and other defects in thymic development. J Clin Immunol. 2023 Feb;43(2):247-70. https://pmc.ncbi.nlm.nih.gov/articles/PMC9892161 http://www.ncbi.nlm.nih.gov/pubmed/36648576?tool=bestpractice.com Those with mild to moderate immunodeficiency should be monitored for infection. Those with significant T-cell deficiency (marked T-cell lymphopenia and absent proliferative responses) should be given sulfamethoxazole/trimethoprim prophylaxis and intravenous immune globulin, and should undergo thymic transplant or adoptive transfer of mature T cells. Infants with significant T-cell immunodeficiency (<600 T cells/mm^3) should receive no live virus vaccines and should receive only irradiated, filtered (leukodepleted) blood products.[99]Moylett EH, Wasan AN, Noroski LM, et al. Live viral vaccines in patients with partial DiGeorge syndrome: clinical experience and cellular immunity. Clin Immunol. 2004;112:106-112. http://www.ncbi.nlm.nih.gov/pubmed/15207787?tool=bestpractice.com [100]Perez EE, Bokszczanin A, McDonald-McGinn D, et al. Safety of live viral vaccines in patients with chromosome 22q11.2 deletion syndrome (DiGeorge syndrome/velocardiofacial syndrome). Pediatrics. 2003;112:e325. http://pediatrics.aappublications.org/cgi/content/full/112/4/e325 http://www.ncbi.nlm.nih.gov/pubmed/14523220?tool=bestpractice.com [101]Chinen J, Rosenblatt HM, Smith EO, et al. Long-term assessment of T-cell populations in DiGeorge syndrome. J Allergy Clin Immunol. 2003;111:573-579. http://www.ncbi.nlm.nih.gov/pubmed/12642839?tool=bestpractice.com [102]Davis CM, Kancherla VS, Reddy A, et al. Development of specific T-cell responses to Candida and tetanus antigens in partial DiGeorge syndrome. J Allergy Clin Immunol. 2008;122:1194-1199. http://www.ncbi.nlm.nih.gov/pubmed/18789819?tool=bestpractice.com [103]Azzari C, Gamineri E, Resti M, et al. Safety and immunogenicity of measles-mumps-rubella vaccine in children with congenital immunodeficiency (DiGeorge syndrome). Vaccine. 2005;23:1668-1671. http://www.ncbi.nlm.nih.gov/pubmed/15705470?tool=bestpractice.com [104]Sullivan KE. Live viral vaccines in patients with DiGeorge syndrome. Clin Immunol. 2004;113:3. http://www.ncbi.nlm.nih.gov/pubmed/15380522?tool=bestpractice.com [105]Waters V, Peterson KS, LaRussa P. Live viral vaccines in a DiGeorge syndrome patient. Arch Dis Child. 2007;92:519-520. http://www.ncbi.nlm.nih.gov/pubmed/16798784?tool=bestpractice.com
Primary options
sulfamethoxazole/trimethoprim: 5-10 mg/kg/day orally given in 2 divided doses on 2-3 days per week, maximum 320 mg/day; or 5-10 mg/kg orally once daily, maximum 320 mg/day
More sulfamethoxazole/trimethoprimDose refers to trimethoprim component.
and
immune globulin (human): dose depends on brand; consult product literature for guidance on dose
immune reconstitution
Treatment recommended for ALL patients in selected patient group
For patients with severe immunodeficiency, transplantation of thymus restores T-cell numbers and improves survival. Thymus is harvested from thymectomy at the time of cardiac surgery and cultured to remove T cells. The remaining thymic epithelium is transplanted into the quadriceps muscle of the recipient. As the immunodeficiency in DiGeorge syndrome is due to lack of an appropriate developmental environment (T cells are produced normally by the bone marrow, but have no thymus in which to develop), replacing the thymus corrects the defect. However, the procedure is technically demanding and available in only two centers worldwide.[111]Davies EG, Cheung M, Gilmour K, et al. Thymus transplantation for complete DiGeorge syndrome: European experience. J Allergy Clin Immunol. 2017 Dec;140(6):1660-1670.e16. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5716670 http://www.ncbi.nlm.nih.gov/pubmed/28400115?tool=bestpractice.com
As an alternative method for immune reconstitution, mature T cells may be transferred from a matched donor by peripheral blood mononuclear cell transfusion or unconditioned bone marrow transplantation. Mature T cells can proliferate without the need for a thymus, and reported outcomes have been similar to those of thymic transplant. Adoptive transfer of T cells has the advantage of being much easier to perform, but repopulating the T-cell pool does not include as many naive T cells as thymic transplant.[16]Land MH, Garcia-Lloret MI, Borzy MS, et al. Long-term results of bone marrow transplantation in complete DiGeorge syndrome. J Allergy Clin Immunol. 2007;120:908-15. http://www.ncbi.nlm.nih.gov/pubmed/17931564?tool=bestpractice.com
calcium + calcitriol
Treatment recommended for ALL patients in selected patient group
Up to 60% of patients have hypocalcemia.[96]Rayannavar A, Levitt Katz LE, Crowley TB, et al. Association of hypocalcemia with congenital heart disease in 22q11.2 deletion syndrome. Am J Med Genet A. 2018 Oct;176(10):2099-103. https://pmc.ncbi.nlm.nih.gov/articles/PMC6467273 http://www.ncbi.nlm.nih.gov/pubmed/30277015?tool=bestpractice.com Often becomes less problematic as the child matures.[60]Ryan AK, Goodship JA, Wilson DI, et al. Spectrum of clinical features associated with interstitial chromosome 22q11 deletions: a European collaborative study. J Med Genet. 1997;34:798-804. http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1051084&blobtype=pdf http://www.ncbi.nlm.nih.gov/pubmed/9350810?tool=bestpractice.com
Managed by oral calcium and vitamin D (calcitriol) supplementation as necessary. Calcium levels should be corrected for albumin, or ionized calcium measurements used.
Doses should be titrated to reach low-normal calcium levels.
Calcium levels can usually may be corrected orally, but if there are significant symptoms, such as tetany, seizure, or prolonged QT interval, intravenous correction is indicated.
If long-term correction is required, urine should be checked to maintain 24-hour urine calcium <300 mg.
Primary options
calcium gluconate: consult specialist for guidance on oral dose
and
calcitriol: children <1 year of age: 0.04 to 0.08 micrograms/kg orally once daily; children 1-5 years of age: 0.25 to 0.75 micrograms orally once daily
hydrochlorothiazide
Treatment recommended for SOME patients in selected patient group
Hypercalciuria is the major complication of treatment for hypocalcemia. If urinary calcium is >300 mg in 24 hours, dose of calcium and calcitriol must be reduced or hydrochlorothiazide may be added to reduce urine calcium excretion if required.
Primary options
hydrochlorothiazide: 0.5 to 2 mg/kg/day orally given in 1-2 divided doses
intravenous calcium for any episode of tetany, seizure, or prolonged QT interval
Treatment recommended for SOME patients in selected patient group
Calcium levels can usually be corrected orally, but if there are significant symptoms, such as tetany, seizure, or prolonged QT interval, intravenous correction is indicated.
Up to 60% of patients have hypocalcemia, and hypocalcemic seizures are more common in neonates.[60]Ryan AK, Goodship JA, Wilson DI, et al. Spectrum of clinical features associated with interstitial chromosome 22q11 deletions: a European collaborative study. J Med Genet. 1997;34:798-804. http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1051084&blobtype=pdf http://www.ncbi.nlm.nih.gov/pubmed/9350810?tool=bestpractice.com Often becomes less problematic as the child matures.[60]Ryan AK, Goodship JA, Wilson DI, et al. Spectrum of clinical features associated with interstitial chromosome 22q11 deletions: a European collaborative study. J Med Genet. 1997;34:798-804. http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1051084&blobtype=pdf http://www.ncbi.nlm.nih.gov/pubmed/9350810?tool=bestpractice.com
Calcium levels should be corrected for albumin, or ionized calcium measurements used. Infusion should be adjusted to maintain serum calcium of about 8.0 mg/dL. Intravenous calcium is highly irritating if extravasation occurs, and infusion that is too rapid can cause cardiac arrest. A central line should be used if possible, and bicarbonate and phosphate are incompatible and must be infused in another line.
Cardiac monitoring is strongly recommended when giving intravenous calcium.
Primary options
calcium gluconate: consult specialist for guidance on intravenous dose
targeted antibiotic therapy
Treatment recommended for ALL patients in selected patient group
Recurrent infections with pneumonia, mastoiditis, and evidence of bronchiectasis may be seen. Antibiotics are adjusted according to syndrome and culture results. Patients with hypogammaglobulinemia are particularly susceptible to encapsulated organisms, including Streptococcus pneumoniae and Haemophilus influenzae type B, enteroviral infections, and Giardia lamblia.[112]Braskett M, Roberts R. Evaluation and treatment of children with primary immune deficiency in the emergency department. Clin Pediatr Emerg Med. 2007;8:96-103.
Therapy for infections is performed according to typical sinusitis management, but if hypocalcemia is present, it should be corrected to avoid potential complications with macrolide antibiotics.
levothyroxine
Treatment recommended for ALL patients in selected patient group
Up to 20% of patients have thyroid disease of some type.[108]Bassett AS, Chow EW, Husted J, et al. Clinical features of 78 adults with 22q11 deletion syndrome. Am J Med Genet A. 2005;138A:307-13. https://pmc.ncbi.nlm.nih.gov/articles/PMC3127862 http://www.ncbi.nlm.nih.gov/pubmed/16208694?tool=bestpractice.com Thyroid function should be assessed regularly by TSH and free T4 monitoring, and replacement therapy started accordingly. Dose is adjusted at 4- to 6-week intervals according to serum TSH.
Primary options
levothyroxine: children ≥4 months: 8-10 micrograms/kg orally once daily initially, adjust dose according to response and serum TSH; children 6-11 months of age: 6-8 micrograms/kg orally once daily initially, adjust dose according to response and serum TSH; children 1-5 years of age: 5-6 micrograms/kg orally once daily initially, adjust dose according to response and serum TSH
feeding therapy
Treatment recommended for ALL patients in selected patient group
Children in this age group routinely have feeding difficulties that may not be associated with cleft palate. First-line therapy is modified feeding approaches to ease feeding, including changing nipples, using bottle feeding if breastfeeding is inadequate, thickening feeds, or changing formulas. Second-line therapy may be required and usually involves placing a percutaneous gastrostomy tube. This should be considered if a child does not gain weight despite other feeding interventions. Feeding difficulties may persist for months to years, but generally resolve before school age.
speech therapy and early bridging sign language +/- surgery
Treatment recommended for ALL patients in selected patient group
In older toddlers, delayed acquisition of speech is a characteristic feature.[52]Óskarsdóttir S, Boot E, Crowley TB, et al. Updated clinical practice recommendations for managing children with 22q11.2 deletion syndrome. Genet Med. 2023 Mar;25(3):100338. https://www.gimjournal.org/article/S1098-3600(22)01018-8/fulltext http://www.ncbi.nlm.nih.gov/pubmed/36729053?tool=bestpractice.com This is not due solely to palate defects, but occurs in most children. Should be treated with speech therapy early and use of bridging sign language. Specific recommendations are available for the management of speech therapy in DiGeorge syndrome.[43]Solot CB, Sell D, Mayne A, et al. Speech-language disorders in 22q11.2 deletion syndrome: best practices for diagnosis and management. Am J Speech Lang Pathol. 2019 Aug 9;28(3):984-99. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6802924 http://www.ncbi.nlm.nih.gov/pubmed/31330115?tool=bestpractice.com
For those with velopharyngeal insufficiency, surgical repair may be indicated to improve speech outcomes.[97]Filip C, Matzen M, Aukner R, et al. Superiorly based pharyngeal flap for treatment of velopharyngeal insufficiency in patients with 22q11.2 deletion syndrome. J Craniofac Surg. 2013;24:501-4. http://www.ncbi.nlm.nih.gov/pubmed/23524725?tool=bestpractice.com
school-aged children (5 to 18 years)
continued monitoring
By school age most feeding issues have improved. The primary issues in this age range are learning disorders and behavioral problems. Those with a history of palatal abnormalities or congenital heart disease may require continued follow-up.
calcium + calcitriol
Treatment recommended for ALL patients in selected patient group
Present in up to 60% of patients.[96]Rayannavar A, Levitt Katz LE, Crowley TB, et al. Association of hypocalcemia with congenital heart disease in 22q11.2 deletion syndrome. Am J Med Genet A. 2018 Oct;176(10):2099-103. https://pmc.ncbi.nlm.nih.gov/articles/PMC6467273 http://www.ncbi.nlm.nih.gov/pubmed/30277015?tool=bestpractice.com Managed by oral calcium and vitamin D (calcitriol) supplementation as necessary. Calcium levels should be corrected for albumin, or ionized calcium measurements used.
Doses should be titrated to reach low-normal calcium levels.
Calcium levels can usually be corrected orally, but if there are significant symptoms, such as tetany, seizure, or prolonged QT interval, intravenous correction is indicated.
If long-term correction is required, the urine should be checked to maintain 24-hour urine calcium <300 mg.
Primary options
calcium gluconate: consult specialist for guidance on oral dose
and
calcitriol: children <6 years of age: 0.25 to 0.75 micrograms orally once daily; children ≥6 years of age: 0.25 to 2 micrograms orally once daily
hydrochlorothiazide
Treatment recommended for SOME patients in selected patient group
Hypercalciuria is the major complication of treatment for hypocalcemia. If urinary calcium is >300 mg in 24 hours, dose of calcium and calcitriol must be reduced or hydrochlorothiazide may be added to reduce urine calcium excretion if required.
Primary options
hydrochlorothiazide: 0.5 to 2 mg/kg/day orally given in 1-2 divided doses
intravenous calcium for any episode of tetany, seizure, or prolonged QT interval
Treatment recommended for SOME patients in selected patient group
Calcium levels can usually be corrected orally, but if there are significant symptoms, such as tetany, seizure, or prolonged QT interval, intravenous correction is indicated.
Up to 60% of patients have hypocalcemia, and hypocalcemic seizures are more common in neonates.[60]Ryan AK, Goodship JA, Wilson DI, et al. Spectrum of clinical features associated with interstitial chromosome 22q11 deletions: a European collaborative study. J Med Genet. 1997;34:798-804. http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1051084&blobtype=pdf http://www.ncbi.nlm.nih.gov/pubmed/9350810?tool=bestpractice.com Often becomes less problematic as the child matures.[60]Ryan AK, Goodship JA, Wilson DI, et al. Spectrum of clinical features associated with interstitial chromosome 22q11 deletions: a European collaborative study. J Med Genet. 1997;34:798-804. http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1051084&blobtype=pdf http://www.ncbi.nlm.nih.gov/pubmed/9350810?tool=bestpractice.com
Calcium levels should be corrected for albumin, or ionized calcium measurements used. Infusion should be adjusted to maintain serum calcium of about 8.0 mg/dL. Intravenous calcium is highly irritating if extravasation occurs, and infusion that is too rapid can cause cardiac arrest. A central line should be used if possible, and bicarbonate and phosphate are incompatible and must be infused in another line. Cardiac monitoring is strongly recommended when giving intravenous calcium.
Primary options
calcium gluconate: consult specialist for guidance on intravenous dose
targeted antibiotic therapy
Treatment recommended for ALL patients in selected patient group
Recurrent infections with pneumonia, mastoiditis, and evidence of bronchiectasis may be seen. Antibiotics are adjusted according to syndrome and culture results. Patients with hypogammaglobulinemia are particularly susceptible to encapsulated organisms, including Streptococcus pneumoniae and Haemophilus influenzae type B, enteroviral infections, and Giardia lamblia.[112]Braskett M, Roberts R. Evaluation and treatment of children with primary immune deficiency in the emergency department. Clin Pediatr Emerg Med. 2007;8:96-103.
Therapy for infections is performed according to typical sinusitis management, but if hypocalcemia is present, it should be corrected to avoid potential complications with macrolide antibiotics.
levothyroxine
Treatment recommended for ALL patients in selected patient group
Up to 20% of patients have thyroid disease of some type.[108]Bassett AS, Chow EW, Husted J, et al. Clinical features of 78 adults with 22q11 deletion syndrome. Am J Med Genet A. 2005;138A:307-13. https://pmc.ncbi.nlm.nih.gov/articles/PMC3127862 http://www.ncbi.nlm.nih.gov/pubmed/16208694?tool=bestpractice.com Thyroid function should be assessed regularly by TSH and free T4 monitoring, and replacement therapy started accordingly. Dose is adjusted at 4- to 6-week intervals according to serum TSH.
Primary options
levothyroxine: children 1-5 years of age: 5-6 micrograms/kg orally once daily; initially, adjust dose according to response and serum TSH children 6-12 years of age: 4-5 micrograms/kg orally once daily; initially, adjust dose according to response and serum TSH; children >12 years of age (growth/puberty incomplete): 2-3 micrograms/kg orally initially, adjust dose according to response and serum TSH; children >12 years of age (growth/puberty complete): 1.6 micrograms/kg orally once daily initially, adjust dose according to response and serum TSH, usual dose 50-200 micrograms/day
behavioral modification techniques
Treatment recommended for ALL patients in selected patient group
Children may be shy, withdrawn, or anxious. Rates of attention-deficit/hyperactivity disorder, oppositional defiant disorder, and autistic spectrum disorders are higher than in the general population.[106]Antshel KM, Fremont W, Roizen NJ, et al. ADHD, major depressive disorder, and simple phobias are prevalent psychiatric conditions in youth with velocardiofacial syndrome. J Am Acad Child Adolesc Psychiatry. 2006;45:596-603. http://www.ncbi.nlm.nih.gov/pubmed/16670654?tool=bestpractice.com Initial approach should involve standard behavioral modification techniques. Managing these symptoms may require consultation with developmental pediatricians and psychiatrists.
Although children have speech delay, their language abilities are relatively preserved later in life when nonverbal learning disorders become predominant. Math skills may be weak. These aspects should be approached with an individualized education plan.
adults
continued monitoring
Regardless of age at diagnosis, follow-up in adults with DiGeorge syndrome is required. Congenital or early-onset features also require frequent monitoring and management as appropriate.[15]Boot E, Óskarsdóttir S, Loo JCY, et al. Updated clinical practice recommendations for managing adults with 22q11.2 deletion syndrome. Genet Med. 2023 Mar;25(3):100344. https://www.gimjournal.org/article/S1098-3600(22)01028-0/fulltext http://www.ncbi.nlm.nih.gov/pubmed/36729052?tool=bestpractice.com Psychiatric disorders comprise the majority of late-onset features in this age group.[44]Biswas AB, Furniss F. Cognitive phenotype and psychiatric disorder in 22q11.2 deletion syndrome: a review. Res Dev Disabil. 2016 Jun-Jul;53-54:242-57. http://www.ncbi.nlm.nih.gov/pubmed/26942704?tool=bestpractice.com
calcium + calcitriol
Treatment recommended for ALL patients in selected patient group
Present in up to 60% of patients.[96]Rayannavar A, Levitt Katz LE, Crowley TB, et al. Association of hypocalcemia with congenital heart disease in 22q11.2 deletion syndrome. Am J Med Genet A. 2018 Oct;176(10):2099-103. https://pmc.ncbi.nlm.nih.gov/articles/PMC6467273 http://www.ncbi.nlm.nih.gov/pubmed/30277015?tool=bestpractice.com Managed by oral calcium and vitamin D (calcitriol) supplementation as necessary. Calcium levels should be corrected for albumin, or ionized calcium measurements used.
Doses should be titrated to reach low-normal calcium levels.
Calcium levels may be corrected orally in most cases, but if there are significant symptoms, such as tetany, seizure, or prolonged QT interval, intravenous correction is indicated.
If long-term correction is required, the urine should be checked to maintain 24-hour urine calcium <300 mg.
Primary options
calcium gluconate: consult specialist for guidance on oral dose
and
calcitriol: 0.25 to 2 micrograms orally once daily
hydrochlorothiazide
Treatment recommended for SOME patients in selected patient group
Hypercalciuria is the major complication of treatment for hypocalcemia. If urinary calcium is >300 mg in 24 hours, dose of calcium and calcitriol must be reduced or hydrochlorothiazide may be added to reduce urine calcium excretion if required.
Primary options
hydrochlorothiazide: 25-100 mg/day orally given in 1-2 divided doses
intravenous calcium for any episode of tetany, seizure, or prolonged QT interval
Treatment recommended for SOME patients in selected patient group
Up to 60% of patients have hypocalcemia.[60]Ryan AK, Goodship JA, Wilson DI, et al. Spectrum of clinical features associated with interstitial chromosome 22q11 deletions: a European collaborative study. J Med Genet. 1997;34:798-804. http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1051084&blobtype=pdf http://www.ncbi.nlm.nih.gov/pubmed/9350810?tool=bestpractice.com
Calcium levels may be corrected orally in most cases, but if there are significant symptoms, such as tetany, seizure, or prolonged QT interval, intravenous correction is indicated.
Calcium levels should be corrected for albumin, or ionized calcium measurements used. Infusion should be adjusted to maintain serum calcium of about 8.0 mg/dL. Intravenous calcium is highly irritating if extravasation occurs, and infusion that is too rapid can cause cardiac arrest. A central line should be used if possible, and bicarbonate and phosphate are incompatible and must be infused in another line. Cardiac monitoring is strongly recommended when giving intravenous calcium.
Primary options
calcium gluconate: consult specialist for guidance on intravenous dose
targeted antibiotic therapy
Treatment recommended for ALL patients in selected patient group
Increased risk for sinopulmonary infections persists, and infections should be treated aggressively with appropriate antibiotic therapy.
Recurrent infections with pneumonia, mastoiditis, and evidence of bronchiectasis may be seen. Antibiotics are adjusted according to syndrome and culture results. Patients with hypogammaglobulinemia are particularly susceptible to encapsulated organisms, including Streptococcus pneumoniae and Haemophilus influenzae type B, enteroviral infections, and Giardia lamblia.[112]Braskett M, Roberts R. Evaluation and treatment of children with primary immune deficiency in the emergency department. Clin Pediatr Emerg Med. 2007;8:96-103.
Therapy for infections is performed according to typical sinusitis management, but if hypocalcemia is present, it should be corrected to avoid potential complications with macrolide antibiotics.
levothyroxine
Treatment recommended for ALL patients in selected patient group
Up to 20% of patients have thyroid disease of some type.[108]Bassett AS, Chow EW, Husted J, et al. Clinical features of 78 adults with 22q11 deletion syndrome. Am J Med Genet A. 2005;138A:307-13. https://pmc.ncbi.nlm.nih.gov/articles/PMC3127862 http://www.ncbi.nlm.nih.gov/pubmed/16208694?tool=bestpractice.com Thyroid function should be assessed regularly by TSH and free T4 monitoring, and replacement therapy started accordingly. Dose is adjusted at 4- to 6-week intervals according to serum TSH.
Primary options
levothyroxine: 1.6 micrograms/kg orally once daily initially, adjust dose according to response and serum TSH, usual dose 50-200 micrograms/day
psychiatric consultation and management
Treatment recommended for ALL patients in selected patient group
Psychiatric disorders comprise the majority of late-onset features in this age group.[44]Biswas AB, Furniss F. Cognitive phenotype and psychiatric disorder in 22q11.2 deletion syndrome: a review. Res Dev Disabil. 2016 Jun-Jul;53-54:242-57. http://www.ncbi.nlm.nih.gov/pubmed/26942704?tool=bestpractice.com Psychiatrists should manage patients with psychosis or schizophrenia with appropriate antipsychotic therapy. Depression, anxiety disorders, and bipolar disorder also occur and are managed typically.[15]Boot E, Óskarsdóttir S, Loo JCY, et al. Updated clinical practice recommendations for managing adults with 22q11.2 deletion syndrome. Genet Med. 2023 Mar;25(3):100344. https://www.gimjournal.org/article/S1098-3600(22)01028-0/fulltext http://www.ncbi.nlm.nih.gov/pubmed/36729052?tool=bestpractice.com
Therapy of schizophrenia is generally typical, but there may be more resistance to antipsychotic therapy. There are few published data on therapeutic recommendations for patients with DiGeorge syndrome, but one case report has successfully used aripiprazole for treatment of resistant psychosis, while another successfully used quetiapine. If hypocalcemia is present it should be corrected, as hypocalcemia alone may provoke psychosis.[107]Lin CE, Hwang KS, Hsieh PH, et al. Treatment of schizophreniform disorder by aripiprazole in a female adolescent with 22q11.2 deletion syndrome. Prog Neuropsychopharmacol Biol Psychiatry. 2010;34:1141-3.
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