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The prevalence of stroke in Indonesia increased overtime. CS ranges from 15 to 40% from all ischemic strokes. Finding the etiology of ischemic stroke is important to prevent recurrence. AF is predicted as the etiology behind CS. The current recommendation only supports short period of ECG monitoring. However, studies have shown that a higher detection rate can be achieved with longer duration of monitoring. ICM, a diagnostic tool with the highest detection rate, is still considered cost-effective when the calculation takes into account the QALY gained. Digital health tools such as handheld devices and smartwatch ECG have revolutionized the screening of AF however it is still considered as pre-diagnostic and verification is needed to confirm the rhythm generated.

Background: Atrioventricular (AV) block is a threatening condition that caused sudden loss of consciousness and death, notably if happened to aircraft pilot will compromise the reliability of flight operations and safety. Cardiac arrhythmia is well known as one of the main disqualifier for loss of flying license, and discriminating between benign and potentially significant rhythm abnormalities remains a challenge. The present case describes the electrophysiological feature of a high-grade AV block in an aircraft pilot. Case illustration: A 60-year-old male worked as commercial aircraft pilot presented with asymptomatic high-grade AV block during inflight Holter monitoring. He had never experienced any remarkable symptoms nor history of near syncope, but had a history of percutaneous coronary intervention (PCI) with one stent at left circumflex (LCx) coronary artery. Electrophysiology (EP) study revealed AH interval of 105 ms, HV interval of 50 ms, AV node effective refractory period of 280 ms and Weckenbach point of 330 ms, suggesting a normal EP study. Stimulation with atrial pacing and ATP showed prolongation of AH interval without changes in HV interval, showing the presence of a supra-Hisian AV node dysfunction. The highly demanding physiological environment in aircraft elucidate the likelihood of vagotonic cause of his condition and pacemaker implantation was not warranted. Conclusion: Atrioventricular (AV) block is an AV conduction disorder that can manifests in various symptoms and severity. Electrophysiology study is considered as a modality to locate the site of block that allows the avoidance of unnecessary permanent pacing and the appropriate prophylactic pacing.

Latar Belakang: Fibrilasi atrium (FA) merupakan aritmia yang paling sering ditemukan. Fibrilasi atrium membutuhkan adanya pemicu untuk inisiasi dan substrat untuk mempertahankan aritmia. Fokus tunggal atau multipel sebagai pemicu, paling sering di vena pulmonal tetapi dapat juga berasal dari selain vena pulmonal, seperti di vena kava superior. Patofisiologi aritmia di vena kava superior masih belum dapat dipahami. Ilustrasi Kasus: Seorang perempuan, 72 tahun, datang ke poliklinik Pusat Jantung Nasional Harapan Kita (PJNHK) dengan keluhan utama sering berdebar-debar. Pasien pertama kali mengeluh berdebar-debar pada tahun 2000, namun baru pada tahun 2007 pasien melakukan pemeriksaan dan terapi dengan obat-obatan serta dilakukan tindakan ablasi FA. Pada tahun 2010, pasien mengeluh berdebar-debar kembali dan dapat dikontrol dengan terapi medikamentosa. Pada tahun 2016, pasien menjalani tindakan ablasi kedua dengan hasil berhasil dilakukan isolasi vena pulmonal dan angiografi koroner memperlihatkan arteri koroner normal. Pasien sempat datang ke UGD PJNHK bulan Mei 2017 dengan keluhan berdebar dan hasil pemeriksaan EKG saat di UGD menunjukkan irama FA. Dilakukan tindakan ablasi ketiga dengan hasil berhasil dilakukan isolasi vena kava superior. Kesimpulan: Vena kava superior dapat berperan sebagai pemicu atau substrat fibrilasi atrium. Sebagai fokus, selain vena pulmonal, yang paling sering menjadi sumber fibrilasi atrium, vena kava superior menjadi target penting saat tindakan ablasi fibrilasi atrium.