Monitoring Spike Potential and Abrupt Impedance Rise with Concomitant Temperature/Contact Force Change for Timely Detection of the Occurrence of “Silent” or “Nonaudible” Steam Pop

<div>(a) RFCA graph showing the course of the parameters during RFCA. The time from the initiation of RFCA to the occurrence of audible SP was 30.2 s. The occurrence of a SP was associated with a preceding impedance drop of 17.6 Ω. The sudden impedance rise after 30.2 s of RFCA coincided with a SP. Immediately after the SP, an abrupt impedance rise of 7.5 Ω, temperature rise of 2.6°C, and CF drop of 4.1 g were recorded. (b) A spike potential was not recorded immediately during the occurrence of SP. (c) The location of the SP is at the anterior-superior wall of the LSPV.</div>

Journal of Interventional Cardiology

fig2

Figure 2

Figure 2: Monitoring Spike Potential and Abrupt Impedance Rise with Concomitant Temperature/Contact Force Change for Timely Detection of the Occurrence of “Silent” or “Nonaudible” Steam Pop 

Figure 2 | Monitoring Spike Potential and Abrupt Impedance Rise with Concomitant Temperature/Contact Force Change for Timely Detection of the Occurrence of “Silent” or “Nonaudible” Steam Pop 