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  • Title: [Incidence of conduction disorders in patients who underwent surgery for hypertrophic obstructive cardiomyopathy].
    Author: Martini B, Buja GF, Bassan L, Rizzardo P, Canciani B, Nava A.
    Journal: Minerva Cardioangiol; 1989 Mar; 37(3):87-90. PubMed ID: 2747944.
    Abstract:
    Thirteen non-consecutive patients, aging 7 to 61 (average 27) years, underwent left ventricular myotomy-myectomy for a severely symptomatic idiopathic hypertrophic subaortic stenosis (IHSS). In all patients the resting ECG before surgery showed P-R less than 0.18 sec, QRS duration less than 0.11 sec, QRS axis ranging from +10 to +80 degrees. In the immediate post-surgical period 3 patients has complete heart block and 1 had 2nd degree type 2 atrio ventricular block. Lesion was infra-Hisian in 3 patients and intra-Hisian in 1 patient. In the remaining 9 patients an immediate post-surgical left bundle branch block appeared; in 3 out of these patients ECG and an electrophysiologic study documented severe infra-Hisian conduction impairments after an average period of 4 years from surgery. During follow-up 3 patients died suddenly.
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