Correlation coefficient between plethysmographic variability index and Systolic Pressure Variation as an indicator for fluid responsiveness in hypotensive patients in the ICU/OT.

Background: Prediction of fluid responsiveness in hypotensive patients is a challenge. The correlation between a novel noninvasive dynamic indicator, Pleth Variability Index (PVI ®), and a gold-standard Systolic Pressure Variation (SPV) as a measure of fluid responsiveness was assessed in the Intensive Care Unit (ICU) or Operation Theatre (OT) in a tertiary care hospital. Methods: A prospective experimental study was conducted over a span of one year on 100 mechanically ventilated patients with hypotension. Vital parameters along with SPV and PVI ® were recorded before and after a standard volume expansion protocol. A 10% SPV threshold was used to define fluid responders and nonresponders. Results: Pearson's correlation graph at baseline showed positive correlation between PVI ® and SPV (r = 0.59, p-value = 0.001). Strength of correlation was comparatively less but still showed positive correlation at 15 (r = 0.39, p-value = 0.009) and 30 (r = 0.404, p-value = 0.004) minutes of fluid bolus. The Bland Altman analysis of baseline values of PVI ® and SPV showed good agreement with a mean bias of 9.05. Percentage change of PVI ® and SPV over 30 min showed a statistically significant positive correlation in the responder group (r = 0.53, p < 0.05). A threshold value of PVI ® more than 18% before volume expansion differentiated fluid responders and nonresponders with a sensitivity of 75% and specificity of 67%, with an area under Receiver Operating Characteristic (ROC) of 0.78. Conclusion: A positive correlation exists between SPV and PVI ®, justifying the use of noninvasive PVI ® in a clinical setting of hypotension.

Anaesthetic management of intraoperative tracheo-bronchial injury.

Intraoperative tracheobronchial injury (TBI) may manifest clinically as pneumothorax, pneumomediastinum, subcutaneous emphysema, cyanosis, and respiratory insufficiency and has serious implications if it remains undetected or is managed improperly. The outcome of such injuries is affected by the extent of the lesion, pulmonary status & the surgical reconstruction undertaken. The recommended airway management of an intraoperative tracheal tear is to bypass the injured side by intubating the healthy bronchus with a single lumen endotracheal tube (ETT) and the use of a bronchial blocker or double lumen endotracheal tube (DLT) and becomes a very challenging situation. We report successful anaesthetic management of an accidental traumatic rupture of the left main bronchus during surgical dissection in an elderly lady of Carcinoma Oesophagus who underwent a Video Assisted Thoracoscopic surgery (VATS), and was managed by one lung ventilation of the contralateral (right) side manipulating the same DLT and lung protective ventilation.