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Article |

Children With Febrile Seizures Do Not Consume Excess Health Care Resources FREE

Kevin E. Gordon, MD, MS; Peter R. Camfield, MD; Carol S. Camfield, MD; Joseph M. Dooley, MB; Peggy Bethune, MD
[+] Author Affiliations

From the Department of Pediatrics, IWK Grace Health Centre, Dalhousie University, Halifax, Nova Scotia.


Arch Pediatr Adolesc Med. 2000;154(6):594-597. doi:10.1001/archpedi.154.6.594.
Text Size: A A A
Published online

Background  Febrile seizures are benign but so terrifying for parents that they may subsequently view their affected children as "vulnerable." Children viewed as vulnerable may be brought to medical attention more frequently. We examined subsequent hospitalizations and physician visits during a 6- to 7½-year period for a group of children who had participated in a case-control study of initial febrile seizures.

Methods  Individual data from a regional cohort of 75 children with a first febrile seizure and 150 febrile and 150 afebrile controls were linked to 2 comprehensive provincial health services databases—a hospital admissions/separations database and a physician services database.

Results  Linkage was achieved for 98% of the study cohort, with heath care utilization data for 6 to 7½ years available for 96%. Children with febrile seizures had nearly identical rates of subsequent hospitalization compared with age-matched controls (χ2 test, P=.88). An excess of day-surgery visits for primarily otolaryngologic procedures was seen for the febrile seizure patients 0 to 12 months after their initial febrile seizure (χ2 test, P<.001). During the next 6 to 7½ years, the febrile seizure patients had nearly identical rates of physician visits (χ2 test, P=.15); however, they had more visits to otolaryngologists in the first 3 to 9 months after the febrile seizure (χ2 test, P<.001), but fewer visits to pediatricians during the next 1 to 4 years (χ2 test, P<.001).

Conclusions  Children with febrile seizures have nearly identical rates of hospital and physician services utilization compared with controls. This supports the hypothesis that febrile seizures are benign, and that parents recover from their initial anxiety and do not consider their children vulnerable to additional illness in the years that follow.

Figures in this Article

FEBRILE SEIZURES are extremely frightening for parents. Most think that their child is dying during the seizure,13 although the epidemiological facts about febrile seizures are very reassuring. Death caused by a febrile seizure has not been reported and must be exceedingly rare, since 3% to 4% of all children will have at least 1 febrile seizure.4 Similarly, the risk of epilepsy is low (2%-4%)5 despite the risk of recurrent febrile seizures in 30% to 40% of children who have a first one.4,6 The intelligence and behavior of children with febrile seizures is convincingly the same as their unaffected siblings at ages 7 and 10 years.7,8 However, it is unclear if parents are adequately reassured by these facts.

The median age of onset for a first febrile seizure is 18 to 22 months,5,9 with almost all recurrences occurring within 24 months6 or up to age 5 years.10 Because children with initial febrile seizures have been shown to have approximately 1.8 fevers per year in a 2-year follow-up,11 there are ample opportunities for parents to relive their fear of their child's death. There is a very real risk that parents may become "fever phobic" and visit physicians excessively. They may view their children as "vulnerable"1214 and as a result they may bring their children to medical attention more frequently.15,16

For these reasons, we hypothesized that children might consume excess health care resources subsequent to a first febrile seizure.

STUDY DESIGN

This study involved the linkage of data from a case-control study of initial febrile seizures17 with both the Nova Scotia Admissions/Separations/Day Treatment database and Medical Services Insurance Physician's Services database.

The original study design was a matched case-control trial, with 2 control groups. Seventy-five children with a first febrile seizure were age-matched within 6 months to 150 febrile (temperature >38°C) and 150 afebrile controls. Cases and controls all presented to the emergency department of the IWK Grace Health Centre, Halifax, Nova Scotia. The visits of controls were within 10 days of those of the cases. All participants resided within Halifax County, which is the primary care catchment area for the facility.

The province of Nova Scotia provides universal health care coverage for all hospital and physician services. The Nova Scotia Admissions/Separations/Day Treatment database contains details of all hospital admissions for the province, including day-surgery visits. The Medical Services Insurance database includes all outpatient and inpatient physicians' fee-for-service claims and therefore documents virtually every physician-patient encounter. Primary care is delivered by family physicians, while pediatricians usually provide consultative care and care within our emergency department.

We examined all hospitalizations and physician contacts for original study participants from birth through study entry (October 15, 1989, to March 15, 1991) and then until March 31, 1997, comprising a follow-up of 6 to 7½ years.

DATA LINKAGE

Linkage was attempted by using the patient health card numbers for the 375 original study participants. Ultimately linkage was achieved for 368 (98%) with the Admissions/Separations/Day Treatment database (73 of 75 patients with febrile seizures, 146 of 150 febrile controls, and 149 of 150 afebrile controls). Linkage was accomplished for 369 (98%) with the Medical Services database (73 of 75 febrile seizures, 147 of 150 febrile controls, and 149 of 150 afebrile controls). The children for whom linkage was not achieved did not have Nova Scotia health card numbers and were most likely children of college or university students living within the study area. During the follow-up period there were only 8 children who were documented to have moved away from the province (2 febrile seizures, 0 febrile controls, and 6 afebrile controls). This allowed for follow-up data for 6 to 7½ years on 96% of the original cohort, and at least partial data on 98%.

STATISTICAL ANALYSIS

Data manipulation and processing was performed using SYSTAT version 7.0.18 Because follow-up was nearly complete and there did not appear to be any systematic editing, all available data were analyzed. Data were graphed using 6-month periods from study entry for hospitalization data and 3-month periods for physician visits. Physician visits could be subanalyzed by physician type (family practitioner, pediatrician, and other specialists). For graphing, the 2 original control groups were viewed separately; however, for statistical testing, the 2 original control groups were amalgamated (as in the initial study). The primary hypotheses were tested using Mantel-Cox log-rank testing.19 After reviewing the graphs, a series of post hoc tests was generated and analyzed similarly, but without any adjustment for multiple testing. This was because of the difficulty in determining the number of tests for post hoc adjustment when the post hoc tests are proposed after graphic review of results.

The Research Ethics Board of the IWK Grace Health Centre approved this study.

DEMOGRAPHICS

Median age at study entry was 1.3 years (range, 0.1-4.4 years); 55% were boys and 45% girls. There was no difference in age or sex composition between the children with a first febrile seizure and the control group. There were 482 hospitalizations and 23,097 physician contacts. The rates of physician visits and hospitalizations prior to study entry did not differ for cases and controls.

HOSPITALIZATION RATES

Children with a first febrile seizure had nearly identical subsequent hospitalization experiences compared with age-matched controls during the next 6 to 7½ years after a first febrile seizure (χ2 test, P=.88) (Figure 1).

Place holder to copy figure label and caption
Figure 1.

Hospital admission rates. E indicates study entry.

Graphic Jump Location

Post hoc results: Hospitalization rates showed an early peak, which corresponds to hospitalizations within 7 days of study entry for those children presenting to the emergency department with fever (febrile seizures and febrile controls). Not unexpectedly, febrile children were 2.6 times more likely to be admitted than were afebrile controls during this time (χ2 test, P=.04). After these early admissions were accounted for, a second peak appears within the hospitalization rates, occurring 0 to 12 months after study entry for the children with febrile seizures. During this 12-month period, children with febrile seizures were 3.1 times as likely as the control children to have same-day admissions (χ2 test, P=.003). Most of the same-day admissions were for otolaryngologic procedures (23 of 32 [72%]). Overall, 12% of children with febrile seizures had an otolaryngologic procedure within 12 months of their initial seizure compared with 4% of the control group.

PHYSICIAN CONTACT RATES

During the subsequent 6 to 7½ years after a first febrile seizure, children with a first febrile seizure had nearly identical rates of physician visits as the control group (χ2 test, P=.15) (Figure 2).

Place holder to copy figure label and caption
Figure 2.

Physician visit rates. E indicates study entry.

Graphic Jump Location

Post hoc results: All children had increased rates of physician visits for the 3-month period after study entry. Compared with controls, children with a first febrile seizure had a 30% increase in physician visits (an excess of 1.5 physician visits) during the first 3 months following their seizure (χ2 test, P<.001). These excess visits for the febrile seizure group were primarily to family practitioners and pediatricians.

Physician visits were examined by type of physician. Rates of visits to family practitioners were not significantly different for children with febrile seizures compared with controls (χ2 test, P=.53). Children with a first febrile seizure had 20% fewer visits to pediatricians during the 6 to 7½ years following their first febrile seizure (χ2 test, P<.001). There was an apparent increase in visits immediately after study entry; however, it is clear that the decrease in visits was primarily accounted for 1 to 4 years after study entry (χ2 test, P<.001). For specialist visits (excluding those to pediatricians), an excess of visits was seen 3 to 9 months after study entry for children with a first febrile seizure (χ2 test, P<.001). Most of these excess visits were to otolaryngologists. In the 3- to 9-month period after study entry, children with a first febrile seizure were 3 times as likely as the control children to have 1 or more visits to an otolaryngologist (χ2 test, P<.001). Twenty-six percent of children with a first febrile seizure had 1 or more visits (median, 3; range, 1-12) within 3 to 9 months of their initial seizure, as compared with 12% of febrile controls and 5% of afebrile controls. At the time of the initial emergency department visit, however, there had been similar rates of otitis media diagnosed between the febrile seizure patients (39% [29/75]) and the febrile controls (35% [53/150]) (P=.62).

Our study shows that children who presented to an emergency department with a first febrile seizure did not have more physician contacts or hospitalizations during the next 6 to 7½ years, compared with age-matched controls who had visited the same emergency department at the same time, but for other reasons.

After the first febrile seizure, there was an increase in otolaryngologic visits and procedures for 9 to 12 months. Although otolaryngologic diseases such as otorrhea and frequent sore throats have been associated with febrile seizures,20 otitis media was not more common at the time of presentation in our febrile seizure group when compared with the febrile control group. An association between tonsillectomy and febrile seizures has been previously reported.20 We presume that parental anxiety and a desire to reduce an important potential source of fever motivated these additional physician contacts.

There is limited evidence that children with febrile seizures are more frequently infected than population-matched controls21 or cohort members without febrile seizures.20 However, both of these studies may have been limited by a recall bias on the part of parents, who were retrospectively reporting illnesses. These findings may have prompted Forsgren et al21 to reexamine their study group's subsequent health utilization. Parents retrospectively reported essentially identical crude rates of health care utilization between cases and controls after a 6- to 7-year follow-up, similar to our own findings.

There was a significant reduction in the use of pediatricians' services following a first febrile seizure. The reason for this change in utilization is unclear. Within our area, pediatricians provide predominantly consultative and emergency care. Families may require these services less often after surviving a perceived life-threatening event.

We were surprised that the experience of a febrile seizure had so little effect on subsequent health care utilization. In 1964, Green and Solnit12 developed the construct of the "vulnerable child." This concept implies that after a child has recovered from a potentially fatal medical condition, there is a marked discrepancy between the child's normal health, development, and growth and the parents' enduring and unfounded perception that the child continues to be at risk for serious illness and premature death. It is likely that a continuum of child vulnerability or overprotection exists for children with ongoing medical conditions.2225 This mismatch between perceived vulnerability and true vulnerability may lead to increased use of health care resources.15,16 One study examining the persistence of child vulnerability in premature infants demonstrated that, by school age, the current perception of health is more related to current ratings of health rather than past health events.26 In our study, even if children with febrile seizures were initially perceived as vulnerable, their families did not respond by seeking excessive physician and hospital visits after the acute event.

The intervention offered to febrile seizure patients in our emergency department during the original study period was not completely standardized. All children were assessed by a pediatrician, most parents saw a short instructional slide-tape presentation about the benign nature of febrile seizures,27 and many stayed overnight in an observation unit attached to the emergency department. We have some evidence that, following this intervention and up to 2 weeks later, most families had retained the basic facts about febrile seizures, although family routines were still disrupted.28

The children with febrile seizures and their families afterward were more likely to visit their family practitioners and pediatricians within 3 months, and subsequently receive specialist care. It may be possible that these visits reinforced the benign nature of febrile seizures and had a reassuring effect on their families, resolving any parental perception of vulnerability.

Because of the pattern of medical practice in our area and the emotional upset caused by a first febrile seizure, we suspect that most patients who present for medical evaluation would come to our emergency department,17 suggesting that our children with febrile seizures were a representative regionally based cohort.

Likewise, the selection of control groups should be commented on. For case-control studies of health care utilization, control groups are ideally drawn from a population accessing health care at the same time and location as the cases. In our original study, the 2 control groups were selected to examine the risk factors for fever independently from those for febrile seizures, and seemed ideal for the subsequent purpose of examining health care utilization. As there were no significant differences between the 2 control groups, they were combined for final analysis in that study.17 For this study, we chose a priori to analyze the 2 control groups together as we had done previously, while presenting the graphic results separately to demonstrate the similarity of the 2 control groups.

During the study period, the Canadian universal health care system allowed all children access to physician and hospital services. There is no parallel private health care system in our province. We used comprehensive databases to count all hospitalizations and all reimbursed physician visits. The accuracy of Canadian health administrative databases for basic demographic and visit data has been documented.29 Hence, the results likely reflect all hospitalizations and physician contacts for this cohort of children.

Although we are confident about the accuracy and completeness of our primary results, a note of caution must be addressed on those derived from post hoc analyses. We did not make any adjustment for multiple statistical testing of results derived from graphic analysis, raising the possibility of type I errors. Furthermore, these findings, even if valid, may be a result of local area practice. Therefore the discovery of increased visits to otolaryngologists and decreased visits to pediatricians after a first febrile seizure requires independent confirmation before generalization. If confirmed, these findings provide a fascinating insight into the clinical course of febrile seizures.

We conclude that even if a febrile seizure renders a child vulnerable in the parents' eyes, it does not lead to long-term increased use of health care resources. Dealing with the fears of parents is important; however, physicians caring for children can be reassured that management decisions for families and their children with febrile seizures need not be driven by any concern that these children will subsequently use excess health care resources.

Accepted for publication November 24, 1999.

We thank Edie Smith, RN, for her assistance with data linkage and Ellen Wood, MD, MS, for her comments during manuscript revision. Access to claims data and assistance with linkage were provided by the Population Health Research Unit, Dalhousie University, Halifax, Nova Scotia.

Reprints: K. E. Gordon, MD, MS, Department of Pediatrics, IWK Grace Health Centre, Box 3070, Halifax, Nova Scotia, Canada B3J 3G9 (e-mail: kegor@is.dal.ca).

Rutter  NMetcalfe  DH Febrile convulsions: what do parents do? BMJ. 1978;21345- 1346
Link to Article
Baumer  JDavid  TValentine  SRoberts  JHughes  B Many parents think their child is dying when having a first febrile convulsion. Dev Med Child Neurol. 1981;23462- 464
Link to Article
Balslev  T Parental reactions to a child's first febrile convulsion. Acta Paediatr Scand. 1991;80466- 469
Link to Article
Nelson  KBEllenberg  JH Prognosis in children with febrile seizures. Pediatrics. 1978;61720- 727
Nelson  KBEllenberg  JH Predictors of epilepsy in children who have experienced febrile seizures. N Engl J Med. 1976;2951029- 1033
Link to Article
Berg  ATShinnar  SHauser  WA  et al.  Predictors of recurrent febrile seizures: a prospective study of the circumstances surrounding the initial febrile seizure. N Engl J Med. 1992;3271112- 1127
Link to Article
Ellenberg  JHNelson  KB Febrile seizures and later intellectual performance. Arch Neurol. 1978;3517- 21
Link to Article
Verity  CMGreenwood  RGolding  J Long-term intellectual and behavioral outcomes of children with febrile convulsions. N Engl J Med. 1998;3381723- 1728
Link to Article
Verity  CMButler  NRGolding  J Febrile convulsions in a national cohort followed up from birth, I: prevalence and recurrence in the first five years of life. Br Med J (Clin Res Ed). 1985;2901307- 1310
Link to Article
Hirtz  DG Generalized tonic-clonic and febrile seizures. Pediatr Clin North Am. 1989;36365- 382
Uhari  MRantala  HVainionpää  LKurttila  R Effect of acetominophen and of low intermittent doses of diazepam on prevention of recurrences of febrile seizures. J Pediatr. 1995;126991- 995
Link to Article
Green  MSolnit  AJ Reactions to the threatened loss of a child: a vulnerable child syndrome. Pediatrics. 1964;3458- 66
Boyce  WT The vulnerable child: new evidence, new approaches. Adv Pediatr. 1992;391- 33
Thomasgard  MMetz  WP The vulnerable child revisited. J Dev Behav Pediatr. 1995;1647- 53
Levy  JC Vulnerable children: parents' perspectives and the use of medical care. Pediatrics. 1980;65956- 963
Thomasgard  MMetz  WP Differences in health care utilization between parents who perceive their child as vulnerable versus overprotective parents. Clin Pediatr Phila. 1996;35303- 308
Link to Article
Bethune  PGordon  KDooley  JCamfield  CCamfield  P Which child will have a febrile seizure? AJDC. 1993;14735- 39
Not Available, SYSTAT version 7.0.  Chicago, Ill SSPS Inc1997;
Norman  GRStreiner  DL Biostatistics: The Bare Essentials.  St Louis, Mo Mosby1994;
Verity  CMButler  NRGolding  J Febrile convulsions in a national cohort followed up from birth, II: medical history and intellectual ability at 5 years of age. Br Med J (Clin Res Ed). 1985;2901311- 1315
Link to Article
Forsgren  LSidenvall  RBlomquist  HKHeijbel  JNystrom  L An incident case-referent study of febrile convulsions in children: genetical and social aspects. Neuropediatrics. 1990;21153- 159
Link to Article
Parker  GLiscombe  P Parental overprotection and asthma. J Psychosom Res. 1979;23295- 299
Link to Article
Hoare  P Does illness foster dependency? a study of epileptic and diabetic children. Dev Med Child Neurol. 1984;2620- 24
Link to Article
Forsyth  BWCMcCue-Horwitz  SLeventhal  JMBurger  JLeaf  PL The child vulnerability scale: an instrument to measure parental perceptions of child vulnerability. J Pediatr Psychol. 1996;2189- 101
Link to Article
Thomasgard  MMetz  WP Parental overprotection and its relation to perceived child vulnerability. Am J Orthopsychiatry. 1997;67330- 335
Link to Article
McCormick  MCBrooks-Gunn  JWorkman-Daniels  KPeckham  GJ Maternal rating of child health at school age: does the vulnerable child syndrome persist? Pediatrics. 1993;92380- 388
Camfield  PRCamfield  CSBuchholz  KBuchholz  M Information on febrile seizures for parents and caretakers. Nelson  KEllenberg  Jeds.Febrile Seizures. New York, NY Raven Press1981;245- 252
Bethune  PGordon  KDooley  JCamfield  PCamfield  C The use of an educational slide-tape program for parents in the emergency room management of a first febrile seizure. Clin Invest Med. 1990;13B105
Williams  JIYoung  W Inventory of Studies on the Accuracy of Canadian Health Administrative Databases.  North York, Ontario ICES Publications1996;

Figures

Place holder to copy figure label and caption
Figure 1.

Hospital admission rates. E indicates study entry.

Graphic Jump Location
Place holder to copy figure label and caption
Figure 2.

Physician visit rates. E indicates study entry.

Graphic Jump Location

Tables

References

Rutter  NMetcalfe  DH Febrile convulsions: what do parents do? BMJ. 1978;21345- 1346
Link to Article
Baumer  JDavid  TValentine  SRoberts  JHughes  B Many parents think their child is dying when having a first febrile convulsion. Dev Med Child Neurol. 1981;23462- 464
Link to Article
Balslev  T Parental reactions to a child's first febrile convulsion. Acta Paediatr Scand. 1991;80466- 469
Link to Article
Nelson  KBEllenberg  JH Prognosis in children with febrile seizures. Pediatrics. 1978;61720- 727
Nelson  KBEllenberg  JH Predictors of epilepsy in children who have experienced febrile seizures. N Engl J Med. 1976;2951029- 1033
Link to Article
Berg  ATShinnar  SHauser  WA  et al.  Predictors of recurrent febrile seizures: a prospective study of the circumstances surrounding the initial febrile seizure. N Engl J Med. 1992;3271112- 1127
Link to Article
Ellenberg  JHNelson  KB Febrile seizures and later intellectual performance. Arch Neurol. 1978;3517- 21
Link to Article
Verity  CMGreenwood  RGolding  J Long-term intellectual and behavioral outcomes of children with febrile convulsions. N Engl J Med. 1998;3381723- 1728
Link to Article
Verity  CMButler  NRGolding  J Febrile convulsions in a national cohort followed up from birth, I: prevalence and recurrence in the first five years of life. Br Med J (Clin Res Ed). 1985;2901307- 1310
Link to Article
Hirtz  DG Generalized tonic-clonic and febrile seizures. Pediatr Clin North Am. 1989;36365- 382
Uhari  MRantala  HVainionpää  LKurttila  R Effect of acetominophen and of low intermittent doses of diazepam on prevention of recurrences of febrile seizures. J Pediatr. 1995;126991- 995
Link to Article
Green  MSolnit  AJ Reactions to the threatened loss of a child: a vulnerable child syndrome. Pediatrics. 1964;3458- 66
Boyce  WT The vulnerable child: new evidence, new approaches. Adv Pediatr. 1992;391- 33
Thomasgard  MMetz  WP The vulnerable child revisited. J Dev Behav Pediatr. 1995;1647- 53
Levy  JC Vulnerable children: parents' perspectives and the use of medical care. Pediatrics. 1980;65956- 963
Thomasgard  MMetz  WP Differences in health care utilization between parents who perceive their child as vulnerable versus overprotective parents. Clin Pediatr Phila. 1996;35303- 308
Link to Article
Bethune  PGordon  KDooley  JCamfield  CCamfield  P Which child will have a febrile seizure? AJDC. 1993;14735- 39
Not Available, SYSTAT version 7.0.  Chicago, Ill SSPS Inc1997;
Norman  GRStreiner  DL Biostatistics: The Bare Essentials.  St Louis, Mo Mosby1994;
Verity  CMButler  NRGolding  J Febrile convulsions in a national cohort followed up from birth, II: medical history and intellectual ability at 5 years of age. Br Med J (Clin Res Ed). 1985;2901311- 1315
Link to Article
Forsgren  LSidenvall  RBlomquist  HKHeijbel  JNystrom  L An incident case-referent study of febrile convulsions in children: genetical and social aspects. Neuropediatrics. 1990;21153- 159
Link to Article
Parker  GLiscombe  P Parental overprotection and asthma. J Psychosom Res. 1979;23295- 299
Link to Article
Hoare  P Does illness foster dependency? a study of epileptic and diabetic children. Dev Med Child Neurol. 1984;2620- 24
Link to Article
Forsyth  BWCMcCue-Horwitz  SLeventhal  JMBurger  JLeaf  PL The child vulnerability scale: an instrument to measure parental perceptions of child vulnerability. J Pediatr Psychol. 1996;2189- 101
Link to Article
Thomasgard  MMetz  WP Parental overprotection and its relation to perceived child vulnerability. Am J Orthopsychiatry. 1997;67330- 335
Link to Article
McCormick  MCBrooks-Gunn  JWorkman-Daniels  KPeckham  GJ Maternal rating of child health at school age: does the vulnerable child syndrome persist? Pediatrics. 1993;92380- 388
Camfield  PRCamfield  CSBuchholz  KBuchholz  M Information on febrile seizures for parents and caretakers. Nelson  KEllenberg  Jeds.Febrile Seizures. New York, NY Raven Press1981;245- 252
Bethune  PGordon  KDooley  JCamfield  PCamfield  C The use of an educational slide-tape program for parents in the emergency room management of a first febrile seizure. Clin Invest Med. 1990;13B105
Williams  JIYoung  W Inventory of Studies on the Accuracy of Canadian Health Administrative Databases.  North York, Ontario ICES Publications1996;

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