Two patients who had recently undergone pulse generator replacement in
which an adapter had been used to connect a preexisting lead to a VS1
and IS1 3.2-mm connecter presented with noncapture. The adapter set-s
crew was found to be protruding from the insulation sleeve to short-ci
rcuit with the pulse generator can. During episodes of noncapture the
telemetered impedance was < 100 ohms.