Endocardial pacing devices and methods useful for resynchronization and defibrillation

A method comprising:

• generating at least partially concurrent electrostimulation pulses of opposing polarity to be delivered via electrodes positioned at a target region at or near the bundle of His in a right ventricle of a heart, the electrostimulation pulses including at least two pulses occurring sufficiently proximate one another in at least one of time or distance to elicit myocardium capture near the target region at or near the bundle of His;
• and
• generating a defibrillation signal in response to a sensed signal indicating the heart is in a defibrillation.

A processor-readable medium, including instructions that, when performed by a processor, cause the processor to:

• generate at least partially concurrent electrostimulation pulses of opposing polarity to be delivered via electrodes positioned at a target region at or near the bundle of His in a right ventricle of a heart, the electrostimulation pulses including at least two pulses occurring sufficiently proximate one another in at least one of time or distance to elicit myocardium capture near the target region at or near the bundle of His;
• and
• generate a defibrillation signal in response to a sensed signal indicating the heart is in a defibrillation.