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• W3118194849 abstract "Our case illustrated zero-fluoroscopic approach on AVNRT ablation in a pregnant lady. A 40 years old gravida 9 para 8 lady with underlying hypertension and recurrent supraventricular tachycardia (SVT) was referred to Cardiology clinic for further management. She had multiple admissions to district hospital throughout a year and subsequently referred to our center. She is currently pregnant at 28 weeks and presented with frequent palpitation episodes within a day, European Heart Rhythm Association III,1 and managed with labetalol by an obstetrician. In view of frequent symptoms and not controlled by medication, decision for ablation was made and best mode of treatment will be zero-fluoroscopic ablation. During symptom-free period, her electrocardiogram (ECG) recording showed sinus rhythm with heart rate of 73 beats per minute (bpm) and no preexcitation recorded. We managed to capture an ECG during tachycardia whereby the ECG revealed a narrow complex tachycardia2, with heart rate of 195 bpm (Figure 1) and noted very short refractory period (RP) interval. Biochemistry wise was unremarkable and echocardiogram revealed structurally normal heart. Thus, she was subjected to electrophysiological study (EPS) with zero-fluoroscopic ablation utilizing CARTO 3D system (Biosense Webster, Diamond Bar, CA) and planned for diagnostic three catheter study to unmask the diagnosis. First catheter, Smart Touch Thermo Cool D & F curve Ablation Catheter (Biosense Webster, Diamond Bar, CA), was advanced gently to the right atrium (RA) until atrial signal seen via electrogram. The catheter movement was reflected through the CARTO system without any restriction of movement. A narrow complex tachycardia was induced spontaneously by premature atrial contraction (PAC) (Figure 2A) while preparing the patient for EPS with tachycardia cycle length (TCL) was measured at 283 milliseconds (ms) and Ventriculo-Atrial (VA) interval of 22 ms (< 70 ms) (Figure 2B)3. Hence, with a single catheter in mid RA, a diagnosis of AVNRT was made and decided for modification of slow pathway. Therefore, 3D geometry of the RA was created while identifying HIS cloud, tricuspid annulus, coronary sinus, and slow pathway signal (Figure 3). Slow pathway was modified with 25 watts and noted junctional rhythms (Figure 2C). The pathway was further consolidated for 2 minutes. Then, a repeated EPS was performed and atrial effective refractory period (ERP) was achieved at an extrastimulus of 500/400/200 (Figure 2D). By achieving atrial ERP with double extrastimulus, we were able to conclude on the successful modification of slow pathway and confirmed the absence of other arrhythmia including atrial tachycardia. Postablation, she remained well, asymptomatic, and this had eased the burden during delivery via spontaneous vaginal delivery. Later, she was reviewed during clinic follow-up and remained asymptomatic. Zero-fluoroscopic ablation is gaining favoritism among electrophysiologist with current advancement of 3D mapping system. Apart from no potential radiation hazard, 3D mapping system offers precise geometric localization, hence hastier ablation procedure4. Furthermore, opportunity of avoiding heavy lead apron is intriguing to the practitioner especially during lengthy procedure4. Unfortunately, initial transition from conventional procedure to 3D mapping system is reflected with prolonged procedure and ablation time4. Nonetheless, previous literature did demonstrate on steep learning curve which lead to significant improvement with the procedure time once the technology is mastered4. In addition, retrospective literatures had demonstrated on successful zero-fluoroscopic ablation of AVNRT with EnSite mapping system (Abbott, St Paul, Min), utilizing multiple diagnostic catheters5 and intracardiac echocardiography6. Multiple diagnostic catheters provided valuable evidence in establishing the diagnosis but in certain circumstance, prompt treatment is warranted, especially in our case. Our decision for a single ablation catheter as diagnostic and therapeutic was firstly centered on patient status who was in the third trimester with easily inducible arrhythmia. Secondly, we observed that her blood pressure reduced to 95/64 mmHg, particularly symptomatic, and concerned prolonged procedure may affect the well-being of the fetus and warranted for swift ablation. Thirdly, we were able to formulate the diagnosis by evaluating ECG (short RP tachycardia) and electrogram (VA < 70 ms), which suggests high likelihood of AVNRT3. Lastly, we do not deny a likelihood of septal atrial tachycardia; however, we were not able to induce any tachyarrhythmia postablation and hence suggestive of accurate diagnosis of AVNRT. As conclusion, our case illustrated the practicability of zero-fluoroscopic ablation of SVT utilizing 3D mapping system in a pregnant lady which yielded desirable outcome. However, diagnosis of AVNRT is best formulated by multiple catheter evaluation as illustrated by previous literature,5 but in our patient, prompt treatment is desirable. In addition, we demonstrated a safer approach of zero-fluoroscopic ablation without intracardiac echocardiography6 by formulating the diagnosis from electrogram despite limited evidence. Authors declare no conflict of interests for this article." @default.
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• W3118194849 date "2020-12-26" @default.
• W3118194849 modified "2023-09-27" @default.
• W3118194849 title "From darkness, a light shall spring: Zero‐fluoroscopic ablation of supraventricular tachycardia in a pregnant lady" @default.
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• W3118194849 doi "https://doi.org/10.1002/joa3.12485" @default.
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