Surgical stress index in response to pacemaker stimulation or atropine

Surgical stress index in response to pacemaker stimulation or atropine.

BACKGROUND The surgical stress index (SSI) is a new monitoring tool for the assessment of nociception during general anaesthesia. It is calculated based on the heart beat interval and the pulse wave amplitude. Correlation of SSI with nociceptive stimuli and opioid effect-site concentrations has been demonstrated, but the influence of isolated modulation of heart rate (HR) on SSI is still unclea...

Response to atropine in Down's syndrome.

Effects of atropine on response-to-change.

The effect of atropine on rats response to the change of brightness was investigated in a T-maze, in two procedural test versions differing in the exposure of visual stimuli. In the passive test the rats could observe the white and black arms through clear partitions which blocked the entrance to the arms, while in the active test they were allowed to explore the maze arms. In the subsequent fr...

Surgical stress index reflects surgical stress in gynaecological laparoscopic day-case surgery.

BACKGROUND Monitoring of analgesia remains a challenge during general anaesthesia. The surgical stress index (SSI) is derived from the photoplethysmographic waveform amplitude and the heart beat-to-beat interval. We evaluated the ability of SSI to measure surgical stress in patients undergoing gynaecological laparoscopy. Our hypothesis was that while keeping State Entropy (SE) at a predetermine...

Influence of gravitational sympathetic stimulation on the Surgical Pleth Index

Purpose: Surgical Plethysmographic Index (SPI), calculated from pulse photo-plethysmographic amplitude oscillations, has been proposed as a tool to measure nociception anti-nociception balance during general anaesthesia, but it is affected by several confounding factor that alter the autonomic nervous system (ANS) modulation. We hypotesised that SPI may be mainly affected by sympathetic stimula...