Dilated Cardiomyopathy and Prone Position: An Anesthetic Challenge

The anesthetic management of a patient with dilated cardiomyopathy (DCM) for noncardiac surgery is challenging due to associated congestive heart failure, malignant dysrhythmias, sudden cardiac arrest, implanted rhythm devices, and thromboembolism. We report successful conduct of a case of DCM on cardiac resynchronization device with Cauda equina syndrome (CES) under general anesthesia in prone position. The anesthetic concerns specific to the pathophysiology of DCM are also discussed.

Tranexamic Acid in Neuroanesthesia and Neurocritical Care: Time for Its Critical Appraisal

There is a renewed interest in the use of antifibrinolytics, especially tranexamic acid (TxA), in varied clinical settings such as trauma, perioperative bleeding, cardiac surgery, and multilevel spine instrumentation procedures. Because of its prothrombotic potential, the use of TxA in neurosurgical disorders has not gained popularity since this subset of the population is more prone to developing thromboembolic complications. However, recent studies have shown that TxA reduces blood loss, reduces the need for allogeneic blood transfusion, and is associated with minimal side effects. In this narrative review, Google Scholar, PubMed, and EMBASE databases were searched to identify publications relevant to the current use of TxA in varied neurosurgical and critical care settings. These publications were analyzed, and a summary of the findings and the role of future research on this drug are presented in this review.

Incidence and predictors of postoperative pulmonary complications in patients undergoing craniotomy and excision of posterior fossa tumor

Background and Aims:

Infratentorial neurosurgical procedures are considered high risk for the development of postoperative pulmonary complications (POPCs), prolonging hospital stay of patients with substantial morbidity and mortality.

Material and Methods:

Patients between the ages of 18 and 65 years, who underwent elective surgery for posterior fossa tumors over a period of two years, were reviewed. Data including American Society of Anesthesiologists physical status; comorbidities like hypertension, diabetes mellitus and hypothyroidism, history of smoking, obstructive sleep apnea, respiratory symptoms, lower cranial nerve (LCN) palsy; intraoperative complications such as hemodynamic alterations suggestive of brain stem or cranial nerve handling, tight brain as informed by the operating neurosurgeon, blood loss, and transfusion; and postoperative duration of mechanical ventilation, tracheostomy, POPCs, length of ICU and hospital stay, general condition of the patient at discharge, and cause of in-hospital mortality were collected. POPC was defined as the presence of atelectasis, tracheobronchitis, pneumonia, bronchospasm, respiratory failure, reintubation, or weaning failure.

Results:

Case files of 288 patients fulfilling the study criteria were analyzed; POPCs were observed in 35 patients (12.1%). On multivariate analysis, postoperative blood transfusion, LCN palsy, prolonged ICU stay, and tracheostomy were found to be independent predictors of POPC.

Conclusions:

The incidence of POPC was 12.1% following infratentorial tumor surgery. The predictors for the occurrence of POPCs were postoperative blood transfusion, LCN palsy, prolonged ICU stay, and tracheostomy.

Effect of tranexamic acid on intraoperative blood loss and transfusion requirements in patients undergoing excision of intracranial meningioma

Surgical excision of meningioma is often complicated by significant blood loss requiring blood transfusion with its attendant risks. Although tranexamic acid is used to reduce perioperative blood loss, its blood conservation effect is uncertain in neurosurgery. Sixty adults undergoing elective craniotomy for meningioma excision were randomized to receive either tranexamic acid or placebo, initiated prior to skin incision. Patients in the tranexamic acid group received intravenous bolus of 20mg/kg over 20min followed by an infusion of 1mg/kg/h till the conclusion of surgery. Intraoperative blood loss, transfusion requirements and estimation of surgical hemostasis using a 5-grade scale were noted. Postoperatively, the extent of tumor excision on CT scan and complications were observed. Demographics, tumor characteristics, amount of fluid infusion, and duration of surgery and anesthesia were comparable between the two groups. The amount of blood loss was significantly less in tranexamic acid group compared to placebo (830mlvs 1124ml; p=0.03). The transfusion requirement was less in tranexamic acid group (p>0.05). The patients in tranexamic acid group fared better on a 5-grade surgical hemostasis scale with more patients showing good hemostasis (p=0.007). There were no significant differences between the groups with regards to extent of tumor removal, perioperative complications, hospital stay or neurologic outcome. To conclude, administration of tranexamic acid significantly reduced blood loss in patients undergoing excision of meningioma. Fewer patients in the tranexamic acid group received blood transfusions. Surgical field hemostasis was better achieved in patients who received tranexamic acid.

Cardio Cerebral Resuscitation: Is it better than CPR?

The guidelines for cardiopulmonary resuscitation (CPR) have been in place for decades; but despite their international scope and periodic updates, there has been little improvement in survival rates in out-of-hospital cardiac arrest for patients who did not receive early defibrillation. Instituting the new cardio cerebral resuscitation protocol for managing prehospital cardiac arrest improved survival of adult patients with witnessed cardiac arrest and an initially shockable rhythm.