Implantation of sinoatrial node cells into canine right ventricle: biological pacing appears limited by the substrate.

Abstract:

:Biological pacing has been proposed as a physiologic counterpart to electronic pacing, and the sinoatrial node (SAN) is the general standard for biological pacemakers. We tested the expression of SAN pacemaker cell activity when implanted autologously in the right ventricle (RV). We induced complete heart block and implanted electronic pacemakers in the RV of adult mongrel dogs. Autologous SAN cells isolated enzymatically were studied by patch clamp to confirm SAN identity. SAN cells (400,000) were injected into the RV subepicardial free wall and dogs were monitored for 2 weeks. Pacemaker function was assessed by overdrive pacing and IV epinephrine challenge. SAN cells expressed a time-dependent inward current (I(f)) activating on hyperpolarization: density = 4.3 ± 0.6 pA/pF at -105 mV. Four of the six dogs demonstrated >50% of beats originating from the implant site at 24 h. Biological pacemaker rates on days 7-14 = 45-55 bpm and post-overdrive escape times = 1.5-2.5 s. Brisk catecholamine responsiveness occurred. Dogs implanted with autologous SAN cells manifest biological pacing properties dissimilar from those of the anatomic SAN. This highlights the importance of cell and substrate interaction in generating biological pacemaker function.

journal_name

Cell Transplant

journal_title

Cell transplantation

authors

Zhang H,Lau DH,Shlapakova IN,Zhao X,Danilo P,Robinson RB,Cohen IS,Qu D,Xu Z,Rosen MR

doi

10.3727/096368911X565038

subject

Has Abstract

pub_date

2011-01-01 00:00:00

pages

1907-14

issue

11-12

eissn

0963-6897

issn

1555-3892

pii

ct0253zhangetalpdf

journal_volume

20

pub_type

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