This prospective randomized double-blinded study was conducted to compare the antishivering effects of two different types of intrathecal administration.

This prospective randomized double-blinded study was conducted to compare the antishivering effects of two different types of intrathecal administration.Group Control:traditional intrathecal administration; Group Diluting:Diluting with cerebrospinal fluid

Inclusion Criteria:

• American Society of Anesthesiologists (ASA) physical status Ⅰ or Ⅱ who were scheduled for elective surgery under spinal anesthesia were enrolled.

Exclusion Criteria:

• Patients with pre-operative fever (>38℃), diabetes, , Parkinson's disease, hypo or hyperthyroidism, Raynaud's syndrome, obese patients (weight >100 kg), patients shorter than 152 cm, those with a history of allergy to the study medications, and patients receiving vasodilators were excluded from the study.