Hypotension after spinal anesthesia for Cesarean section occurs in up to 90% usually under five minutes after local anesthetics administration. These changes are poorly depicted by oscillometric measurements. The investigators hypothesized, that a continuous noninvasive device detects more hypotensive periods with lower blood pressures.

Inclusion Criteria:

• ASA physical status I or II
• week of pregnancy >36

Exclusion Criteria:

• emergency cases

elective Cesarean section under spinal anesthesia