The usefulness of proximal anchor balloon technique during implantation of a cardiac resynchronization therapy device in a patient with complex coronary venous anatomy: a case report

Table 1 Organized timeline of the patient symptoms and interventions

03/2017	Progressive shortness of breath and angina upon exertion since last few years	New York Heart Association (NYHA) Class III
04/2017	Permanent Pacemaker implantation Heart Failure (HFrEF)
06/2018	Worsening of shortness of breath and angina upon exertion since last few months
07/2018	Patient admitted to outside facility	Left ventricular ejection fraction (LVEF) 25%
	Heart Failure (HFrEF)	Left ventricular ejection fraction (LVEF) 25%
	LBBB	ACE inhibitor and beta-blocker
	Reduced left ventricular systolic function
	Heart Failure medications initiated
08/2018	Referred to our centre
	Coronary angiography	No coronary artery disease, slow flow
	Heart failure medication intensified	ACE inhibitor + betablocker + MR antagonist dose increased
08/2018	Heart failure (HFrEF)	NYHA class III
	Left bundle branch block	QRS 160 ms
	Reduced left ventricular systolic function	LVEF 25%
08/2018	CRT D Implantation	QRS 110 ms
09/2018	Heart failure (HFrEF) Patient symptomatically improving	New York Heart Association (NYHA) Class II

ISSN: 1471-2261