Exercise-induced left bundle branch block and subsequent mechanical left ventricular dyssynchrony -resolved with pharmacological therapy

Table 2 Resting and peak stress clinical and echocardiographic characteristics at baseline and follow-up in the patient

	Baseline		5-month after pharmacological therapy
	Rest	Peak stress	Rest	Peak stress
Clinical parameters
Heart rate (bpm)	60	138	54	135
Systolic blood pressure (mmHg)	136	184	118	176
Diastolic blood pressure (mmHg)	64	106	58	102
Double product (mmHg/min)	8160	25392	6372	23760
Echocardiographic parameters
LV end-diastolic volume (ml)	108	109	87	88
LV end-systolic volume (ml)	70	76	44	40
LV ejection fraction (%)	35	30	49	54
Mitral inflow pattern	impaired LV relaxation	impaired LV relaxation	normal	normal
E/E'	18.9	19.3	11.4	10.9
Radial dyssynchrony by speckle tracking strain (ms)	45	260	42	48

E, early diastolic wave velocity; E', early diastolic mitral annular velocity; LV, left ventricular