Studying the hemodynamic effects of titrated subarachnoid anesthesia versus conventional single-shot subarachnoid anesthesia

This study aims to investigate whether a different hemodynamic effect is related to the injection o titrated local anesthetic for subarachnoid anesthesia versus the conventional single shot injection. The data to be recorded are blood pressure and pulse rate at different timing. As secondary outcomes the investigators will record the anesthetic level achieved using the Bromage score.

Inclusion Criteria:

• BMI 20-40 kg/m2
• ASA 1-3
• undergoing total hip arthroplasty
• no controindications to subaracnhoid block
• able to understand and sign a written informed consensus
• METs > o = 4

Exclusion Criteria:

• baseline SBP < 100 mmHg