Abstract:
BACKGROUND:Patients with congenital heart disease (CHD) and heterotaxy show high postsurgical morbidity/mortality, with some developing respiratory complications. Although this finding is often attributed to the CHD, airway clearance and left-right patterning both require motile cilia function. Thus, airway ciliary dysfunction (CD) similar to that of primary ciliary dyskinesia (PCD) may contribute to increased respiratory complications in heterotaxy patients. METHODS AND RESULTS:We assessed 43 CHD patients with heterotaxy for airway CD. Videomicrocopy was used to examine ciliary motion in nasal tissue, and nasal nitric oxide (nNO) was measured; nNO level is typically low with PCD. Eighteen patients exhibited CD characterized by abnormal ciliary motion and nNO levels below or near the PCD cutoff values. Patients with CD aged >6 years show increased respiratory symptoms similar to those seen in PCD. Sequencing of all 14 known PCD genes in 13 heterotaxy patients with CD, 12 without CD, 10 PCD disease controls, and 13 healthy controls yielded 0.769, 0.417, 1.0, and 0.077 novel variants per patient, respectively. One heterotaxy patient with CD had the PCD causing DNAI1 founder mutation. Another with hyperkinetic ciliary beat had 2 mutations in DNAH11, the only PCD gene known to cause hyperkinetic beat. Among PCD patients, 2 had known PCD causing CCDC39 and CCDC40 mutations. CONCLUSIONS:Our studies show that CHD patients with heterotaxy have substantial risk for CD and increased respiratory disease. Heterotaxy patients with CD were enriched for mutations in PCD genes. Future studies are needed to assess the potential benefit of prescreening and prophylactically treating heterotaxy patients for CD.
journal_name
Circulationjournal_title
Circulationauthors
Nakhleh N,Francis R,Giese RA,Tian X,Li Y,Zariwala MA,Yagi H,Khalifa O,Kureshi S,Chatterjee B,Sabol SL,Swisher M,Connelly PS,Daniels MP,Srinivasan A,Kuehl K,Kravitz N,Burns K,Sami I,Omran H,Barmada M,Olivier K,doi
10.1161/CIRCULATIONAHA.111.079780subject
Has Abstractpub_date
2012-05-08 00:00:00pages
2232-42issue
18eissn
0009-7322issn
1524-4539pii
CIRCULATIONAHA.111.079780journal_volume
125pub_type
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