PMC1199590_01
12-lead ECG showing first degree Atrio-Ventricular block. Paper speed is 25 mm/s and scale is 10 mm/mV.
1471-2261-5-23-1.jpg
PMC1199590_01_1471-2261-5-23-1.jpg
F1
ECG (figure 1) had revealed a first degree AV block, PR interval measuring 290 milliseconds, with normal QRS duration.
Hemodynamic tracing showing left atrium and ventricle pressures. Capital letters represent ECG waves, whereas small letters represent left atrium waves (see text for details). Scale is 40 mmHg and paper speed is 100 mm/s.
1471-2261-5-23-2.jpg
PMC1199590_01_1471-2261-5-23-2.jpg
F2
With the trans-septal technique, moreover, we demonstrated (figure 2) that atrial contraction prematurely occurred soon after mitral valve opening, as shown on the left atrial tracing by the a wave (corresponding to atrial systole) falling very close to the preceding y wave (corresponding to early-diastolic unloading of the atrium into the ventricle).