case_images: PMC6174779_01
case_images: Patient A. Ventricular rate 149, SVT.
case_images: CRIEM2018-1387207.001.jpg
case_images: PMC6174779_01_CRIEM2018-1387207.001.jpg
case_images: fig1
case_images: Her arrival electrocardiograph (ECG) revealed regular narrow complex tachycardia (see Figure 1).
case_images: Patient A. Sinus rhythm, ventricular rate 75, and postconversion.
case_images: CRIEM2018-1387207.002.jpg
case_images: PMC6174779_01_CRIEM2018-1387207.002.jpg
case_images: fig2
case_images: She did this and converted to sinus rhythm (see Figure 2) within five breaths.
case_images: PMC6174779_02
case_images: Patient B. 12-lead ECG, ventricular rate 138, and SVT.
case_images: CRIEM2018-1387207.003.jpg
case_images: PMC6174779_02_CRIEM2018-1387207.003.jpg
case_images: fig3
case_images: SVT (see Figure 3). She was subjected to the similar head down deep breathing (HDDB) maneuver as described above and converted to sinus rhythm without any complications.