Everything You Always Wanted to Know About Fetal Arrhythmias, in 40 Minutes!
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1 Everything You Always Wanted to Know About Fetal Arrhythmias, in 40 Minutes! Fetal Arrhythmias! What is clinically important?!tachycardia (>200)!Fixed bradycardia (<~100)!Irregular???! Distribution ! Isolated extrasystoles!!!1213! Supraventricular tachycardia!! 69! Atrial flutter!!!!! 21! Atrial fibrillation!!!! 4! Sinus tachycardia!!! 8! Junctional tachycardia!!! 2! Ventricular tachycardia!!! 6! Second degree AV block!! 10! Sinus bradycardia!!! 2! Complete heart block!!! 39! TOTAL!!!!!1378! PACs! Clinical question:!! How often do irregular fetal heart rates signal:! significant fetal arrhythmias! neonatal arrhythmias! other fetal cardiac problems! 1
2 Referral for arrhythmia! Total referrals for arrhythmia:!595!!arrhythmia on exam:!!255!(42.9%)!!nsr on exam:!!!330!(55.5%)!!other arrhythmias:!! 10! (1.7%)! Risk of structural CHD! CHD in 2/614 (0.3%, 95% CI 0-0.7%)! SVT & overriding aorta! 2 heart block & corrected TGA! Small VSD s found in 2 additional neonates! 2
3 Significant Arrhythmias! Supraventricular tachycardia!! 5! Atrial flutter!!!!! 2! Ventricular tachycardia!!! 1! CHD & significant arrhythmia!! 2! Total!!!!!!10! Pediatric Follow-up! Significant postnatal arrhythmia - 5!!WPW!!!!3!!!Postnatal day 1!!2!!!Age 4 years!!!1!!chaotic atrial rhythm!1!!frequent PVC s!!1! All had extrasystoles on prenatal scan! Proper Management! Current standard:!!fetal echocardiogram!!weekly auscultation! Alternative:!!Single fetal monitor session minutes!!problem: 23.2% present < 24 weeks! No follow-up if no arrhythmia found! Continue auscultation for those with PAC s! SVT! 3
4 Fetal SVT! IVC Physiology! Fetal SVT! Be sure of diagnosis! Re-entrant! Atrial flutter! Talk to your local cardiologist/ electrophysiologist! Be careful with meds:! anything that can stop an arrhythmia can CAUSE one too!! Multiple drug interactions! Observation often best Rx! 4
5 Heart block! 5
6 Heart block! Half structural heart disease! Complex lesions! AV Septal defects! Corrected transposition! Heterotaxias (asplenia, polysplenia)! Half immunologic! Anti-SSA/Ro, SSB/La! Structural anomalies rare!? Treatments in future! Complete Heart block! Frequent association with hydrops! Complete heart block + structural heart disease + hydrops = deadly! Complete heart block & hydrops with immunologic cause may be treatable! Time of Detection of CHB (N= 264)! % of Total N=33 N= 115 N= 45 N= 13 N= 10 N= at birth Weeks gestation N= 32 (27 <1999) N= 10 < 1 year N= 4 > 1 year Complete Heart Block! Ventricular rate can increase with!!ß- mimetics! AV contraction sequence is critical! Myocarditis also present! 70% 24 weeks! J Buyon 10/27/2008 Risk CHB with anti-ro/la?! Prospective study 118 pregnancies/100 women! All anti-ro! CCHB 2% first pregnancies! (95% CI 0.2-7%)! CCHB 0/18 second pregnancies! Complete Heart Block! Neonatal Lupus Registry! Subsequent pregnancies in 49! CHB recurred in 16%! Neonatal lupus rash in 6%! Brucato Arthritis Rheum 2001;44:1832-5! Buyon J Am Coll Cardiol 1998;31: ! 6
7 CHB Rx steroids! First reported 1995 (Yale)! Other case reports! Review Neonatal Lupus Registry! No difference progression with steroids! Possible benefit resolution effusions!? Rx started too late to benefit! Saleeb Arthritis Rheum 1999;42: ! CHB Early Diagnosis! Measurement mechanical PR interval! Mitral a wave = EKG P wave! Ventricular systole = QRS complex! Time interval onset a wave to systole! Normal msec 2 nd & 3 rd!? ability to identify 1 heart block by prolonged PR interval! Glickstein Am J Cardiol 2000;86:236-9! Results! Onset a! e! Complete heart block in 3, all <23 weeks! TOP 2 for NIH, both after dex! Both had normal echo <2 wk earlier! Both had TR at prior echo! Atrial densities in 1! 3rd alive at 1 year, with pacemaker! Onset systole! Heart Block Cases! Echo Dense Left Atrium! 0.15 PR Interval Gestational Age Solid blue line - mean; dashed blue lines ± 3 SD! 7
8 1 Heart Block Cases! Results! 1º heart block in 3:! weeks! Resolved with 3-7 days of dex! Both normal EKG at birth! 1 normal PR through 30 wk! 32 wk! 1 st degree block on EKG! Still 3 years! PR Interval Gestational Age Solid blue line - mean; dashed blue lines ± 3 SD! Summary! 1 º heart block may be reversible with dex! High recurrence rate substantiated! Advanced block & cardiomyopathy can occur within 1 week of a normal mechanical PR interval! Tricuspid regurgitation and atrial echodensities may be important markers of impending conduction system injury! 3º block not reversible despite immediate intervention! 8
9 Conclusions! Even weekly evaluation of mechanical PR interval alone may not be sufficient! We are unable to conclude whether 1 block is a necessary step along a path to complete block! Needed: A reliable marker of early disease and/or a safe and economical method of prophylaxis! Speculation! Weekly echo from weeks! If either:! Atrial echodensity! Tricuspid regurgitation! Prolonged mechanical PR interval! Offer maternal dexamethasone! CHB in Labor External Tracing! CHB in Labor Internal Scalp Electrode! 9
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