Conditions: Digital Block
Allocation: NA | Intervention model: SINGLE_GROUP
Enrollment: 20
Healthy volunteers: no

Brief summary:
This study will further investigate the Masimo SpHb \[FDA Approved\] continuous non-invasive hemoglobin monitor in spine surgery patients. (See NCT00792597) We will investigate the effect of enhanced circulation to the finger (which will be attached to the sensor) following a local injection (digital block) of lidocaine (an FDA approved local anesthetic), and assess the accuracy of the SpHb reading as it relates to a standard laboratory hemoglobin value (tHb).

Detailed description:
We have completed a study with 20 patients using the latest version of the SpHb monitor software and finger sensor.

The purpose of this study is to assess the accuracy of the SpHb reading as it relates to a standard laboratory hemoglobin value (tHb) following the digital block.

Arms:
arm 1: None

Interventions: intervention 1: Lidocaine digital block intervention 2: Masimo SpHb continuous hemoglobin monitor
Intervention descriptions: intervention 1: One dose of lidocaine 2% injected locally into one finger (2 mls total) intervention 2: Masimo SpHb continuous hemoglobin monitor

Protocol document: