Evaluation of suitability of fluid management using stroke volume variation in patients with prone position during lumbar spinal surgery

Background: Static parameters such as central venous pressure and pulmonary artery occlusion pressure, have limitation in evaluation of patients’ volume status. Dynamic parameters such as stroke volume variation (SVV), have been used to evaluate intraop-erative hemodynamic volume status, in various operations. We examined if SVV is also effective for patients undergoing operation with prone position for fluid management. Methods: Eighteen patients that received spinal surgery under prone position Novem-ber 2015 to May 2016, were enrolled. Patients were kept at an SVV value less than 14% during surgery. Changes of pre-, post-operative volume status were evaluated, using transthoracic echocardiography. Results: Mean fluid administered was 1,731.97 ± 792.38 ml. Left ventricular end-dia-stolic volume was 72.85 ± 13.50 ml before surgery, and 70.84 ± 15.00 ml after surgery (P value = 0.594). Right ventricular end-diastolic area was 15.56 ± 1.71 cm² before sur-gery, and 13.52 ± 2.65 cm² after surgery (P value = 0.110). Inferior vena cava diameter was 14.99 ± 1.74 mm before surgery, and 13.57 ± 2.83 mm after surgery (P value = 0.080). Conclusions: We can confirm that fluid management based on SVV is effective, even in prone position surgery. So, SVV, that can be measured by continuous arterial pressure, can be considered a guideline for effective fluid management in spinal surgery.