Objectives: To assess parents’ understanding of their child’s congenital heart disease in various knowledge domains and to identify significant determinants of parental knowledge.
Design: Cross sectional questionnaire survey
Setting: Tertiary paediatric cardiac centre.
Patients: 156 parents of children with relatively simple congenital heart defects were recruited from the outpatient clinic of a tertiary cardiac centre over a three month period. The questionnaire comprised 10 items of knowledge under three domains: nature of heart disease and its treatment; impact of heart disease on exercise capacity; and infective endocarditis and its prevention. The frequency distribution of the parents’ knowledge in the different domains was determined. Univariate analyses and logistic regression were performed to identify significant determinants of knowledge in selected items.
Results: While 59% of parents correctly named their child’s congenital heart disease, only 28.8% correctly indicated the heart lesion(s) diagrammatically. However, more than 80% of parents were aware of the indications and aims of previous surgical and transcatheter interventions. About half of the parents were aware of possible aetiologies and of the hereditary nature and symptoms attributable to underlying heart disease. Disappointingly, of the 56 parents whose children were taking cardiac medications, only 25 (44.6%) and 4 (7.1%) knew correctly the functions and important side effects of the medications, respectively. With regard to exercise capacity, 59% of parents indicated its level appropriate for the heart lesion. While 26.9% of parents had heard of the term “infective endocarditis”, slightly more than half of the parents were aware of the need for antibiotics before dental procedures. Significant determinants of knowledge in the nature of heart disease were cardiac diagnosis, occupation of parents, and their educational level. Logistic regression failed to identify any significant determinants of parental knowledge in the other two domains.
Conclusions: Parents of children with congenital heart disease have important knowledge gaps. Our findings suggest that the current educational programme is inadequate and needs to be refined to promote better parental understanding of their child’s heart disease, with the ultimate aim of enabling parents to impart such knowledge accurately to their children.
- congenital heart disease
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The knowledge of one’s own disease is an important determinant of health related behaviour.1 Much effort has therefore been devoted to educating patients with chronic diseases in an attempt to change their health behaviour and maximise their health benefits.2 For children with congenital heart disease, parents’ knowledge about their child’s heart disease, treatment, and prevention of complications may likewise promote a better health related behaviour in their child by increasing the understanding of the cardiac problem, improving compliance with treatment, and avoiding risk taking behaviour. In the past decade, significant advances in transcatheter and surgical management of paediatric cardiac patients have been made. Nonetheless, several recent studies have shown that understanding of illness by children, adolescents, and adults with congenital heart disease remains unsatisfactory.3–13 The paediatric cardiac patients may have an entirely wrong concept of their disease,7–10 while the majority of adult patients have a poor understanding of symptoms suggestive of cardiac deterioration, risk factors of endocarditis, the impact of smoking and alcohol on heart disease, and the hereditary nature of their cardiac conditions.11–13 Given the important role of parents in imparting knowledge of chronic illness to their child, the disappointing findings from previous studies may perhaps reflect inadequacies of parental knowledge.
Previous studies on the knowledge of parents of children with congenital heart disease are limited.3–6 Furthermore, only certain aspects have been interrogated.3–6 In addition, the relatively small number of parents being recruited limits the power of the study to identify important determinants of parental knowledge. In this study, we therefore assessed the parents’ understanding of their child’s congenital heart disease in three domains: firstly, the nature of heart disease and its treatment; secondly, the impact of heart disease on exercise capacity; and thirdly, infective endocarditis and its prevention. We further determined, in the light of the findings, significant determinants of parental knowledge in the various domains.
In this cross sectional questionnaire survey, parents who were accompanying their child to the outpatient clinic of a tertiary cardiac centre were recruited over a three month period. To enable a more realistic appraisal of parental knowledge, only those who had a child with relatively simple structural heart lesions were included. These cardiac defects were atrial septal defect, ventricular septal defect, atrioventricular septal defect, patent ductus arteriosus, pulmonary stenosis, aortic stenosis, tetralogy of Fallot, and transposition of the great arteries. All parents gave verbal informed consent. Parents of children with complex cyanotic heart disease and those with children with a new diagnosis of heart disease were excluded.
Demographic data including age, educational level, occupation, and marital status of the parents were obtained during the interview. Their occupations were classified according to the International Standard Classification of Occupations,14 with slight modifications, into six categories: professionals, administrators and managers, skilled workers, service workers, unskilled workers, and unemployed. From the medical records, the following data were collected: age and sex of the patient, cardiac diagnosis, associated non-cardiac diseases, family history of congenital heart disease, previous cardiac operations or therapeutic cardiac catheterisations, current medications, and history of infective endocarditis.
The parental knowledge was assessed under three domains: the nature of heart disease and its treatment; the impact of heart lesion on exercise capacity; and infective endocarditis and its prevention. Table 1 summarises the items in each of these three domains. These were based in part on the questionnaire previously used by Moons and colleagues.13 A diagram of the normal heart showing the four cardiac chambers and normal connection of the great arteries was shown to parents, who were then asked to draw or indicate the heart defect(s) on the diagram. Answers to each of the topics in the three domains, except for those regarding risk factors predisposing to infective endocarditis, were then determined by paediatric cardiologists to be either correct, incomplete, or incorrect. Answers regarding risk factors predisposing to endocarditis were dichotomised as either correct or incorrect.
A pilot study was carried out with 20 parents to ensure that the questions were easily understood. The questionnaire was administered by one of the three interviewers (DKLC, SMYW, and YPC) during a face to face interview with parents in the outpatient clinic, either before or after their child had been seen by the paediatric cardiologist or resident. All of the questions were presented in a standardised manner, with further clarification if necessary.
Data are expressed as percentages and 95% confidence intervals. Univariate analysis to assess for associations between demographic and clinical variables with selected items of knowledge was performed with the Mann-Whitney U test, Fisher’s exact test, or the χ2 test where appropriate. Multivariate analysis by logistic regression was used to identify significant determinants of selected items of knowledge. The dependent knowledge variable was dichotomised as a correct or incorrect answer. Incorrect answers were deemed as incomplete, incorrect, and don’t know answers. A probability value of p < 0.05 was considered significant. All statistical analyses were done with SPSS version 10.0 (SPSS Inc, Chicago, Illinois, USA)
Table 2 summarises demographic data of the parents and patients. One hundred and fifty six parents (112 were mothers and 44 fathers) of 156 patients (78 boys) were interviewed. The median age of mothers was 38 years (range 26–52 years) and that of fathers was 41 years (range 28–65 years). The majority of parents (83% of fathers and 82% of mothers) had at least completed high school education. Most of the fathers were skilled workers (42.9%) and most of the mothers were housewives (56.4%) (table 2). The median age of patients at the time of study was six years (range one month to 21 years). Of the 156 patients, 101 (64.7%) had undergone previous corrective operations or therapeutic cardiac catheterisations and 25 (16%) were taking cardiac medications. A positive family history of congenital heart disease was present in 24 (15.4%) patients.
Parental knowledge in various domains
Nature of the heart disease and its treatment
While 59% of parents correctly named their child’s congenital heart disease, only 28.8% correctly indicated the heart lesion(s) on the diagram (table 3). Although most parents could describe the presence of a hole inside the heart, they could not specify by name or on the diagram whether it was an atrial, ventricular, or atrioventricular type of defect. On the other hand, while almost all parents could name tetralogy of Fallot correctly, locating all the structural lesions on the diagram was difficult for them. Nonetheless, parents were very knowledgeable about their child’s past interventions, including surgical and transcatheter ones. More than 80% of parents were aware of the indications and aims of these interventions. About half of the parents were aware of the hereditary nature and possible aetiologies of congenital heart disease and symptoms attributable to the disease. Disappointingly, of the 56 parents whose child was taking cardiac medications at the time of study, only 25 (44.6%) and 4 (7.1%) knew correctly the functions and important side effects of the medications, respectively.
Impact of heart disease on exercise capacity
Fifty nine per cent of parents answered correctly on the necessity for exercise restriction appropriate for their child’s heart condition (table 3). The majority of the remaining parents, however, tended to impose excessive exercise restriction.
Infective endocarditis and its prevention
None of the patients in this cohort had documented episodes of infective endocarditis (table 3). Only 26.9% (42 of 156) of all parents had heard of the term infective endocarditis. Despite this, slightly more than half (52.4%) of the parents knew that antibiotics had to be taken before dental procedures, although they may not be aware of the underlying reason for doing so.
Of the 42 parents who had heard of infective endocarditis, only 12 (28.6%) correctly stated the symptoms of endocarditis (table 3). Dental abscess, the most well known risk factor of infective endocarditis, was correctly identified by only 21 parents (50%). Contaminated needles, body piercing and tattooing, skin infection, and poor skin and nail care were identified correctly as risk factors of endocarditis by 15 (35.7%), 15 (35.7%), 13 (31%), and 11 (26.2%) parents, respectively.
Determinants of parental knowledge
Univariate analysis showed that cyanotic heart diseases, including tetralogy of Fallot and transposition of the great arteries, were named correctly more often than acyanotic ones (90.7% v 46.9%, p < 0.001). Professionals, administrators, and skilled workers were more likely to name the heart lesions correctly than service workers, unskilled workers, or unemployed parents (67.9% v 38.3%, p = 0.001 for fathers, and 76% v 51.4%, p = 0.004 for mothers). Parents with an educational attainment of at least high school level were more likely to name the heart lesions correctly than those with primary school level or lower (80% v 55.9%, p = 0.041 for fathers, and 64.5% v 46.2%, p = 0.046 for mothers). Likewise, the ability to indicate correctly the heart defect on the diagram was related to cardiac diagnosis (p = 0.021), occupation (p < 0.01), and educational level (p < 0.05) of both parents. Across the cardiac diagnostic categories, 68%, 63%, 43%, 39% of parents correctly indicated abnormalities of tetralogy of Fallot, transposition of the great arteries, valvar stenosis, and left to right shunts on the diagram, respectively (p = 0.021).
Regarding descriptions of cardiac symptoms, parents of children with cyanotic heart disease, compared with those with children who had acyanotic heart disease (86% v 38.1%, p < 0.001), parents of patients who had previous interventions (60.4% v 34.5%, p = 0.002), and fathers who were professionals, administrators, or skilled workers (56.9% v 38.3%, p = 0.033) were more likely to be correct. On the other hand, parents whose children were older (median age 7.2 v 4.4 years, p = 0.045) were more likely to give correct answers to the question on exercise prescription.
Awareness of infective endocarditis was related to age of the patient, frequency of follow up, and the father’s occupation and educational level. Parents who were aware of infective endocarditis had older children (median age 8.0 v 5.3 years, p = 0.04), less frequent follow up (8 v 6 monthly, p = 0.047), and higher education attainment (30.2% v 11.1%, p = 0.042) and more likely to be professionals, administrators, or skilled workers (32.1% v 14.9%, p = 0.026).
Table 4 summarises the results of logistic regression. The findings showed that cardiac diagnosis and occupations of parents were the main determinants of parents’ knowledge of the nature of their child’s heart disease. Cyanotic heart lesions were more likely than acyanotic heart lesions to be named and indicated on the diagram correctly. Furthermore, symptoms attributable to cyanotic lesions were more likely to be described correctly by parents. Professionals, administrators, and skilled workers were likewise more likely to give correct answers when asked to name, indicate on a diagram, and provide possible causes of the congenital heart disease. No significant determinants of knowledge regarding the impact of heart disease on exercise capacity and infective endocarditis were identified by logistic regression.
In this study, we have assessed parents’ understanding of their child’s congenital heart disease in different domains, which differs from most of the previous studies that focused on particular aspects.3–6 Despite recent advances in medical and surgical management of paediatric cardiac patients, the findings of the present study suggest that parents have important knowledge gaps. While the majority of parents could name the cardiac lesion, either in part or completely, and were knowledgeable concerning previous surgical or transcatheter interventions, their knowledge of the aetiology and symptoms of congenital heart disease were limited. Furthermore, only slightly more than half were aware of the impact of their child’s heart disease on exercise capacity. Disappointingly, their knowledge about infective endocarditis and side effects of cardiac medications appear to be quite deficient.
In the present study 59% of parents named their child’s heart defect correctly, which is comparable with the 27–98% reported previously.4–6 The wide percentage range in the literature is perhaps not unexpected when determinants of parental knowledge in this domain are considered. Kaden and colleagues6 reported that parental understanding of heart defects correlates with parental occupation and educational level.6 Likewise, we identified these as significant determinants in the present cohort. Additionally, the cardiac diagnosis was found to be a significant determinant. Indeed, Moons and colleagues13 have shown that in adult patients with congenital heart disease, correct location of the heart defect is determined by the primary cardiac diagnosis. Interestingly, we found that tetralogy of Fallot and transposition of the great arteries were more likely to be named correctly, probably because the name of the diagnosis itself is composite and specific, in contrast to the non-specific description of “a hole within the heart” for the various types of septal defects.
As alluded to earlier, parents’ understanding of the side effects of medications was disappointingly poor in our cohort. This is perhaps related to emphasis being placed on the potential beneficial effect of the medications and the importance of compliance on the part of the medical staff, and to the relative lack of emphasis on the potential side effects, especially when parents did not take the initiative to ask.
There have been no previous studies on parental knowledge of exercise prescription for children with congenital heart disease. Recently, Swan and colleagues15 reported that parents commonly have misconceptions about exercise prescription for adult patients with congenital heart disease. Parents of children with heart disease had similar misconceptions in this regard. It is perhaps not surprising that parents of older children had a better understanding, as questions regarding the need for exercise restriction are usually asked when their children enter primary school.
The poor awareness of infective endocarditis is not unique to this cohort. Previous studies have reported that only 14–63% of parents know about infective endocarditis.3–5 It is possible that when parents were counselled on prevention against infective endocarditis, lay terms such as “infection” or “inflammation of heart tissue” were used and that the parents may not be fully aware of the significance of this clinical entity. While parents of children younger than 5 years were reported to know less about infective endocarditis,4 the findings were not confirmed in a subsequent study.5 In the present study, although parents of older children were found to be more knowledgeable on this issue by univariate analysis, this factor becomes insignificant after adjustment for other demographic and clinical variables.
Some limitations of this study may deserve comment. Firstly, as no standard instrument for evaluating parental knowledge of congenital heart disease is available, our questionnaire was based in part on the one reported recently by Moon and colleagues.13 Undoubtedly, formal assessment of the psychometric properties, internal consistency, reliability, and validity of these questionnaires is ideal and should be the target in future large scale surveys. Nevertheless, semistructured questionnaires, used previously in some studies,5,6,9,13 have similarly yielded important data in the assessment of patient and parental knowledge on congenital heart disease. Secondly, as some of the parents were interviewed after the cardiac consultation, a possible confounding influence relating to knowledge reinforcement cannot be completely eliminated. Nonetheless, as the attending doctor is not aware of the interview that follows, it seems unlikely that the messages given during consultation would differ from usual. Thirdly, it is important to note that the findings of this study reflect parental knowledge on relatively simple congenital heart lesions.
Despite these potential limitations, the findings from this and other studies have important implications. The need for education of these parents, through structured and repetitive educational activities, about aspects of congenital heart disease and the use of illustrations cannot be overemphasised. Greater attention should be given to the at risk groups.
In conclusion, from this cross sectional study, we have identified important knowledge gaps in parents of children with various types of simple congenital heart disease. The current education programme needs to be refined to achieve better parental understanding of their child’s heart disease, with the ultimate aim of enabling parents to impart accurately their knowledge to their children.