Key Points
- To introduce and evaluate technical refinements to the isolated perfused heart preparation for recording contractile signals and quantifying pharmacological drug responses.
- Implemented a transverse recording technique to capture contractile waveforms from the right ventricle at constant diastolic tension in isolated perfused rat hearts.
- Administered (-)-noradrenaline to elicit changes in heart rate and contractile force.
- Compared three quantitative analytical methods for evaluating contractile response: percentage of control, absolute increment, and percentage of maximal response.
- Transverse recording obtained a simplified contraction waveform from the right ventricle under stable, constant diastolic tension.
- Expressing contractile increments as a percentage of the maximum response provided superior pharmacological relevance compared to absolute units or percentage of control records.
Structured PICO
PPopulationRat isolated perfused heart model
IInterventionTransverse recording method and administration of (-)-noradrenaline
OOutcomeChanges in heart rate and force of contractionsurrogate
A new transverse recording method for isolated perfused hearts provides a simple waveform, and assessing responses as a percentage of the maximum is recommended for pharmacological relevance.