Annals of Pediatric Cardiology
About us | Current Issue | Archives | Ahead of Print | Instructions | Submission | Subscribe | Advertise | Contact | Login 
     
     
 


 

 
     
    Advanced search
 

 
 
     
 
    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
    Email Alert *
    Add to My List *
* Registration required (free)  


    Abstract
   Introduction
   Methods
   Results
   Discussion
    References
    Article Figures
    Article Tables

 Article Access Statistics
    Viewed4128    
    Printed38    
    Emailed0    
    PDF Downloaded465    
    Comments [Add]    

Recommend this journal

 


 
Table of Contents   
ORIGINAL ARTICLE  
Year : 2016  |  Volume : 9  |  Issue : 3  |  Page : 205-209
Birth prevalence of congenital heart disease: A cross-sectional observational study from North India


1 All Institute of Medical Sciences, New Delhi, India
2 Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
3 Department of Pediatrics, Columbia Asia Hospital, Gurgaon, Haryana, India
4 Department of Obstetrics and Gynecology, Hindu Rao Hospital, New Delhi, India
5 Department of Biostatistics, All Institute of Medical Sciences, New Delhi, India
6 Department of Cardiology, All Institute of Medical Sciences, New Delhi, India

Click here for correspondence address and email

Date of Web Publication25-Aug-2016
 

   Abstract 

Objective: To assess the birth prevalence and pattern of congenital heart disease (CHD) using echocardiography in babies born in a community hospital of North India.
Methods: A cross-sectional observational study conducted over a period of 3 years. Newborns born over a specific 8-h period of the day were recruited in the study. They underwent routine clinical examination and pulse oximetry, followed by screening echocardiography for diagnosing a CHD.
Results: A total of 20,307 newborns were screened, among which 874 had abnormal echocardiograms; 687 had insignificant CHDs, 164 had significant CHDs, and 24 had other abnormal cardiac findings. The birth prevalence of significant CHDs was 8.07 per 1000 live births; 131 newborns had an acyanotic CHD (79.9%) and 33 a cyanotic CHD (20.1%). Ventricular septal defect (VSD) was the most common acyanotic CHD, present in 116 newborns, giving a prevalence of 5.7/1000 live births. Among the cyanotic CHD, transposition of great arteries was most common (prevalence 0.34/1000 live births).
Conclusion: The CHD birth prevalence in our study is similar to the reported worldwide birth prevalence. Acyanotic CHD (mostly VSD) is seen in about three-fourths of babies born with CHD. The more sinister cyanotic CHD is present in remaining 25%.

Keywords: Congenital heart disease, echocardiography, newborns, prevalence

How to cite this article:
Saxena A, Mehta A, Sharma M, Salhan S, Kalaivani M, Ramakrishnan S, Juneja R. Birth prevalence of congenital heart disease: A cross-sectional observational study from North India. Ann Pediatr Card 2016;9:205-9

How to cite this URL:
Saxena A, Mehta A, Sharma M, Salhan S, Kalaivani M, Ramakrishnan S, Juneja R. Birth prevalence of congenital heart disease: A cross-sectional observational study from North India. Ann Pediatr Card [serial online] 2016 [cited 2019 Sep 21];9:205-9. Available from: http://www.annalspc.com/text.asp?2016/9/3/205/189122



   Introduction Top


Congenital heart disease (CHD) has been defined as a gross structural abnormality of the heart or intrathoracic great vessels that is actually or potentially of functional significance.[1] In the developed world, CHD is considered to be the most major congenital anomaly and a leading cause of mortality in the first year of life.[2],[3] However, little data is available from developing countries. The birth prevalence of CHD is estimated to be eight per 1000 live births.[4],[5] The burden of CHD in India is likely to be enormous, because of a very high birth rate. It is estimated that over 180,000 children in India are born with CHD every year.[6] As only a very small proportion get required intervention, the number of young adults with CHD is steadily increasing. This heavy burden emphasizes the importance of CHD in India.

Recent advances in cardiovascular diagnostics and therapeutics have increased the survival of infants and children with CHDs. Unfortunately, access to quality care for children with CHD is largely restricted to developed parts of the world. It is important to have reliable information about CHD birth prevalence in the developing world, including India, to plan and provide better care to these patients. An earlier study from India,[7] published in 1994, has reported on the prevalence of CHD at birth, but the diagnosis is primarily based on clinical examination. It is well known that routine clinical examination of newborns has a poor sensitivity for detection of CHD.[8],[9] Echocardiography with Doppler is the gold standard for the diagnosis of CHD in newborns with a very high sensitivity and specificity.[10],[11],[12]

In our study, we describe the birth prevalence of CHDs in babies born in a general hospital of North India using screening echocardiography.


   Methods Top


In a cross-sectional observational study conducted over a period of 3 years at the Safdarjung Hospital located in North India, we screened newborns for CHDs using echocardiography. Nearly 20,000 deliveries occur in this hospital every year, but babies born over a period of 8 h everyday were included in the study for logistic reasons. Newborns were screened for CHDs by a study team comprising of two pediatric cardiologists, a research officer, a field investigator, and a social worker. The team was from the All India Institute of Medical Sciences (AIIMS), a tertiary referral center located very close to the Safdarjung Hospital.

The ethics committees of both the primary hospital and the referral center approved the study protocol.

Informed consent

An informed consent sheet with details of the study protocol was given to one of the parents and approval sought in writing before recruiting the newborn in the study. None of the parents refused to provide consent.

Initial evaluation

The research officer performed routine clinical examination within 24 h of birth. This was recorded in a form that included the following parameters: central cyanosis, murmur on chest auscultation, and respiratory distress. Also the field investigator for all newborns obtained noninvasive arterial oxygen saturation within 48 h of life. Oximetry values were obtained from one of the feet of the baby. A persistent saturation of less than 95% was considered abnormal.

Echocardiography

All newborns recruited into the study were screened using transthoracic echocardiography after the initial evaluation, but within 48 h of life. A pediatric cardiologist performed echocardiography using the Fujifilm SonoSite M Turbo (Bothell, WA, USA) ultrasound system. The technique involved performing cross-sectional echocardiography, and Doppler and color flow imaging in various views. The cardiologist was not aware of the results of the initial clinical evaluation. All loops and images were stored in digital format for later review, if required. Newborns with CHDs were referred to AIIMS for further management or intervention, if needed. Also in case of any difference in diagnosis, the test was repeated at AIIMS by one of the pediatric cardiologists using the Philips IE-33 (Philips echocardiography equipment, Philips Inc., Bothell, WA, USA).

Definition of congenital heart diseases

  1. Normal: No echocardiographic abnormality or any of the following: Patent ductus arteriosus (PDA) <2 mm in size without volume overload of left ventricle, patent foramen ovale or atrial septal defect (ASD) <5 mm without volume overload of right ventricle, and mild turbulence at branch pulmonary arteries.
  2. Insignificant congenital heart diseases: Very small muscular ventricular septal defect (VSD), as these are likely to close spontaneously.
  3. Significant congenital heart diseases: These are divided into minor and major CHDs:

    1. Minor congenital heart disease: ASD >5 mm, PDA >2 mm with left ventricle volume overload, restrictive VSD, and valvular aortic/pulmonary stenosis with gradients <25 mmHg.
    2. Major congenital heart disease: Further divided into acyanotic and cyanotic CHDs; any CHD that was likely to require intervention within the first year, including newborns with critical CHD that require intervention within the first 4 weeks of life.


    1. Acyanotic CHD: Nonrestrictive VSD, valvular aortic/pulmonary stenosis with gradients >25 mmHg, and coarctation of aorta (nonduct dependent).
    2. Cyanotic CHD: Hypoplastic left heart syndrome, transposition complexes, aortic arch interruption, univentricular heart, Tetralogy of Fallot, Tetralogy of Fallot-like conditions associated with pulmonary stenosis or atresia, total anomalous pulmonary venous connection, persistent truncus arteriosus, Ebstein's anomaly, etc.
    3. Other cardiac findings on echocardiography: Persistent pulmonary hypertension of newborn, cardiac tumor, situs inversus dextrocardia, and arrhythmias (complete heart block, supraventricular tachycardia).


Statistical analysis

The sample size was calculated by using the estimates for prevalence of CHD as 6-8/1000 live births. A sample size of 6000 was calculated to be adequate. However, as one of the secondary objectives was to determine the relative proportion of various congenital heart defects, especially the major ones, the sample size chosen was 20,000. This is in keeping the incidence of critical heart disease as three per 1000 live births. A sample size of 20,000 will provide 160 newborns with congenital cardiac defects and about 60 of these will have major CHD requiring early intervention. Data was managed and entered in MS Excel and analyzed using Stata 11.0 (College Station, Texas, USA). The prevalence rate was reported as “per 1000 live births”; 95% confidence intervals (CIs) were calculated using the Wilson method.


   Results Top


A total of 20,307 newborns were recruited in our study and screened with echocardiography for diagnosing a CHD. Among these, 10,878 were boys and 9429 were girls. The birth weight ranged from 0.7 to 5.2 kg (mean 2.79 ± 0.53 kg). The echocardiographic findings are shown in the [Figure 1].
Figure 1: Echocardiographic findings in the total cohort (n = 20,307). CHD: Congenital heart disease, Others: Other cardiac findings. *One newborn had congenital heart block (other cardiac finding) along with Tetralogy of Fallot

Click here to view


Birth prevalence of congenital heart diseases

In the total cohort, 874 newborns had an abnormal echocardiogram at birth. Among these, 164 had significant CHDs, yielding a birth prevalence rate of 8.07 per 1000 live births (95% CI, 6.94-9.40 per 1000); 131 babies had acyanotic CHD, of which 93 had a minor CHD and 38 a major acyanotic CHD, yielding a birth prevalence of 4.58 (95% CI, 3.74-5.61 per 1000) and 1.87 (95% CI, 1.36-2.57 per 1000), respectively. A total of 33 newborns had cyanotic CHD (prevalence 1.63; 95% CI, 1.12-2.28 per 1000). The number and frequency of all significant CHDs is shown in [Table 1].
Table 1: Birth prevalence of significant congenital heart diseases

Click here to view


Twenty-four newborns had abnormal echocardiograms that were not because of CHD. They have been grouped together as other cardiac findings. These are listed along with their birth prevalence in [Table 2].
Table 2: Prevalence of other cardiac anomalies

Click here to view


Role of initial evaluation in detection of significant CHDs

Clinical examination results were available for 19,433 newborns (95.7% of the total cohort), out of which 163 had significant CHDs. An abnormal clinical examination was recorded in 552 newborns and 40 of these were true positives. Thus, the sensitivity and specificity of clinical examination were 24.54% (95% CI, 18.15-31.88) and 97.34% (95% CI, 97.11-97.57), respectively.

Pulse oximetry results were available for 19,009 newborns (93.6% of the total cohort). Oxygen saturation was persistently below 95% in 6048 babies; 159 of 19,009 newborns had significant CHDs and oximetry detected a saturation <95% in 75 of these. The sensitivity and specificity of pulse oximetry were 47.17% (95% CI, 39.21-55.23) and 68.31% (95% CI, 67.64-68.98), respectively.


   Discussion Top


Previous studies from India have reported a variable prevalence of CHD. The prevalence rate varies from as low as 1.3 per 1000 to as high as 13.28 per 1000 children.[7],[13],[14],[15],[16],[17],[18] Many of these studies have used the prevalence of CHDs in school children and these are mainly offshoots of prevalence studies for rheumatic fever and rheumatic heart disease. As a large number of congenital heart defects are critical and lead to death in early life itself, these studies on school children have limited value and underestimate the true burden of CHD in India.

The birth prevalence of significant CHDs in our study was 8.07 per 1000 live births. This is almost the same as the worldwide birth prevalence rate of CHDs.[4] Minor CHDs consisted of 56.7% of the significant CHDs and the birth prevalence rate was 4.58 per 1000 live births. Major CHDs consisted of the remaining 43.3% with a birth prevalence rate of 3.49 per 1000 live births. These were further divided into major acyanotic (prevalence 1.87/1000) and major cyanotic CHDs (prevalence 1.63/1000).

VSDs (restrictive and nonrestrictive) were the most common significant CHDs (43.9% and 20.7%, respectively) with a prevalence rate of 5.22 per 1000 live births. ASDs and PDAs consisted of 7.3% and 4.3% of the significant CHDs, with a prevalence rate of 0.59/1000 and 0.34/1000, respectively. This number is lower as compared with the other studies because most of the ASDs and PDAs detected in our study were not large enough to be classified as significant CHDs.[7],[13],[14],[15],[16],[17],[18] There were two cases each of pulmonary stenosis, coarctation of aorta, and aortic stenosis.

Among the major cyanotic CHDs, transposition of great arteries and hypoplastic left heart syndrome were the most common (seven and five cases; prevalence 0.34/1000 and 0.25/1000, respectively). There were three cases each of atrioventricular septal defects with pulmonary atresia and Tetralogy of Fallot (0.15/1000). The other cyanotic CHDs are listed in [Table 1].

In addition, echocardiography in newborns helped identify 17 cases of persistent pulmonary hypertension of newborns, four cases of arrhythmias, and two with situs inversus along with dextrocardia. One case had a cardiac tumor (likely rhabdomyoma).

Initial evaluation of newborns using clinical examination and pulse oximetry was helpful in detecting a few cases of significant CHDs before being diagnosed with echocardiography. Clinical examination detected only 40 of 163 significant CHDs (sensitivity 24.54%) and a persistent saturation of less than 95% on pulse oximetry was seen in 75 of 159 significant CHDs (sensitivity 47.17%). This is less as compared with similar recent studies from other countries.[19],[20],[21],[22]

Limitations

Although echocardiography with Doppler is the gold standard for diagnosing CHDs, it is an operator-dependent procedure and hence expertise in performing and interpreting echocardiographic images is very important. Also echocardiography has a 5.4% rate of false positives.[23] Many newborns with ASDs and PDAs at birth were classified as having normal echocardiographic findings because of the small lesion size; a follow-up echocardiogram of such newborns is necessary to ascertain the resolution of these lesions.

Financial support and sponsorship

The study was funded by a restricted grant from the Indian Council of Medical Research, New Delhi, India. The grant ID was 5/4/1-15/08-NCD-II and used only for conducting the study.

Conflicts of interest

AS: Guarantor, conceptualized and designed the study, obtained funding for the project, performed echocardiograms of newborns, reviewed and critically revised the manuscript, and approved the final manuscript as submitted. AM: Data analysis and interpretation, drafted the manuscript, and approved the final manuscript as submitted. MS, SS: Contributed to design of the study, supervised the study at primary hospital, and approved the final manuscript as submitted. MK: Contributed to design of the study, data analysis, and approved the final manuscript as submitted. RJ, SR: Contributed to data analysis, and approved the final manuscript as submitted. None of the authors have any competing interests.

 
   References Top

1.
Mitchell SC, Korones SB, Berendes HW Congenital heart disease in 56,109 births. Incidence and natural history. Circulation 1971;43:323-32.  Back to cited text no. 1
    
2.
Wren C, Reinhardt Z, Khawaja K. Twenty-year trends in diagnosis of life-threatening neonatal cardiovascular malformations. Arch Dis Child Fetal Neonatal Ed 2008;93:F33-5.  Back to cited text no. 2
    
3.
Dolk H, Loane M, Garne E; for the European Surveillance of Congenital Anomalies (EUROCAT) Working Group. Congenital heart diseases in Europe: Prevalence and perinatal mortality, 2000 to 2005. Circulation 2011;123:841-9.  Back to cited text no. 3
    
4.
Bernier PL, Stefanescu A, Samoukovic G, Tchervenkov CI. The challenge of congenital heart disease worldwide: Epidemiologic and demographic facts. Semin Thorac Cardiovasc Surg Pediatr Card Surg Annu 2010;13:26-34.  Back to cited text no. 4
    
5.
Van der Linde D, Konings EE, Slager MA, Witsenburg M, Helbing WA, Takkenberg JJ, et al. Birth prevalence of congenital heart disease worldwide: A systematic review and meta-analysis. J Am Coll Cardiol 2011;58:2241-7.  Back to cited text no. 5
    
6.
Saxena A. Congenital heart disease in India: A status report. Indian J Pediatr 2005;72:595-8.  Back to cited text no. 6
    
7.
Khalil A, Aggarwal R, Thirupuram S, Arora R. Incidence of congenital heart disease among hospital live births in India. Indian Pediatr 994;31:519-27.  Back to cited text no. 7
    
8.
Wren C, Richmond S, Donaldson L. Presentation of congenital heart disease in infancy: Implications for routine examination. Arch Dis Child Fetal Neonatal Ed 1999;80:F49-53.  Back to cited text no. 8
    
9.
Meberg A, Otterstad JE, Froland G, Hals J, Sörland SJ. Early clinical screening of neonates for congenital heart disease: The cases we miss. Cardiol Young 1999;9:169-74.  Back to cited text no. 9
    
10.
Sung RY, So LY, Ng HK, Ho JK, Fok TF. Echocardiography as a tool for determining the incidence of congenital heart disease in newborn babies: A pilot study in Hong Kong. Int J Cardiol 1991;30:43-7.  Back to cited text no. 10
    
11.
Sands A, Craig B, Mulholland C, Patterson C, Dornan J, Casey F. Echocardiographic screening for congenital heart disease: A randomized study. J Perinat Med 2002;30:307-12.  Back to cited text no. 11
    
12.
Skinner JR. Echocardiography in the neonatal unit: A job for the neonatologist or cardiologist. Arch Dis Child 1998;78:401-2.  Back to cited text no. 12
    
13.
Thakur JS, Negi PC, Ahluwalia SK, Sharma R, Bhardwaj R. Congenital heart disease among school children in Shimla hills. India Heart J 1995;47:232-5.  Back to cited text no. 13
    
14.
Chadha SL, Singh N, Shukla DK. Epidemiological study of congenital heart disease. Indian J Ped 2001;68:507-10.  Back to cited text no. 14
    
15.
Misra M, Mittal M, Verma AM, Rai R, Chandra G, Singh DP, et al. Prevalence and pattern of congenital heart disease in school children of eastern Uttar Pradesh. Indian Heart J 2009;61:58-60.  Back to cited text no. 15
    
16.
Bhat NK, Dhar M, Kumar R, Patel A, Rawat A, Kalra BP. Prevalence and pattern of congenital heart disease in Uttarakhand, India. Indian J Pediatr 2013;80:281-5.  Back to cited text no. 16
    
17.
Sawant SP, Amin AS, Bhat M. Prevalence, pattern and outcome of congenital heart disease in Bhabha Atomic Research Centre Hospital, Mumbai. Indian J Pediatr 2013;80:286-91.  Back to cited text no. 17
    
18.
Kumari NR, Raju IB, Patnaik AN, Barik R, Singh A, Pushpanjali A, et al. Prevalence of rheumatic and congenital heart disease in school children of Andhra Pradesh, South India. J Cardiovasc Dis Res 2013;4:11-4.  Back to cited text no. 18
    
19.
De Wahl Granelli A, Wennergren M, Sandberg K, Mellander M, Bejlum C, Inganäs L, et al. Impact of pulse oximetry screening on detection of duct dependent congenital heart disease: A Swedish prospective screening study in 39 821 newborns. BMJ 2009;338:a3037.  Back to cited text no. 19
    
20.
Ewer AK, Middleton LJ, Furmston AT, Bhoyar A, Daniels JP, Thangaratinam S, et al.; and the PulseOx Study Group. Pulse oximetry screening for congenital heart defects in newborn infants (PulseOx): A test accuracy study. Lancet 2011;378:785-94.  Back to cited text no. 20
    
21.
Singh A, Rasiah SV, Ewer AK. The impact of routine predischarge pulse oximetry screening in a regional neonatal unit. Arch Dis Child Fetal Neonatal Ed. 2014: 99(4):F297-302.  Back to cited text no. 21
    
22.
Zhao QM, Ma XJ, Ge XL, Liu F, Yang WL, Wu L, et al.; and the Neonatal Congenital Heart Disease Screening Group. Pulse oximetry with clinical assessment to screen for congenital heart disease in neonates in China: A prospective study. Lancet. 2014;384(9945):747-54.  Back to cited text no. 22
    
23.
Valmari P. Should pulse oximetry be used to screen for congenital heart disease? Arch Dis Child Fetal Neonatal Ed 2007;92:F219-24.  Back to cited text no. 23
    

Top
Correspondence Address:
Anita Saxena
DM, Room # 29, Department of Cardiology, All India Institute of Medical Sciences, New Delhi
India
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0974-2069.189122

Rights and Permissions


    Figures

  [Figure 1]
 
 
    Tables

  [Table 1], [Table 2]



 

Top