Acute and Critical Care

Cardiology
Diagnostic accuracy of left ventricular outflow tract velocity time integral versus inferior vena cava collapsibility index in predicting post-induction hypotension during general anesthesia: an observational study: Vibhuti Sharma, Arti Sharma, Arvind Sethi, Jyoti Pathania; Acute Crit Care. 2024;39(1):117-126. Published online February 23, 2024; DOI: https://doi.org/10.4266/acc.2023.00913

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Background
Point of care ultrasound (POCUS) is being explored for dynamic measurements like inferior vena cava collapsibility index (IVC-CI) and left ventricular outflow tract velocity time integral (LVOT-VTI) to guide anesthesiologists in predicting fluid responsiveness in the preoperative period and in treating post-induction hypotension (PIH) with varying accuracy. Methods: In this prospective, observational study on included 100 adult patients undergoing elective surgery under general anesthesia, the LVOT-VTI and IVC-CI measurements were performed in the preoperative room 15 minutes prior to surgery, and PIH was measured for 20 minutes in the post-induction period. Results: The incidence of PIH was 24%. The area under the curve, sensitivity, specificity, positive predictive value, negative predictive value, and diagnostic accuracy of the two techniques at 95% confidence interval was 0.613, 30.4%, 93.3%, 58.3%, 81.4%, 73.6% for IVC-CI and 0.853, 83.3%, 80.3%, 57.1%, 93.8%, 77.4% for LVOT-VTI, respectively. In multivariate analysis, the cutoff value for IVC-CI was >51.5 and for LVOT-VTI it was ≤17.45 for predicting PIH with odd ratio [OR] of 8.491 (P=0.025) for IVCCI and OR of 17.427 (P<0.001) for LVOT. LVOT-VTI assessment was possible in all the patients, while 10% of patients were having poor window for IVC measurements. Conclusions: We recommend the use of POCUS using LVOT-VTI or IVC-CI to predict PIH, to decrease the morbidity of patients undergoing surgery. Out of these, we recommend LVOT-VTI measurements as it has showed a better diagnostic accuracy (77.4%) with no failure rate.

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Where the Postanesthesia Care Unit and Intensive Care Unit Meet
Mary Rose Gaylor, David N. Hager, Kathleen Tyson
Critical Care Clinics.2024; 40(3): 523. CrossRef

Anesthesiology/Pediatric
Aspiration Pneumonia in a Pediatric Patient under General Anesthesia despite Adequate Preoperative Fasting: Sang-Il Yoon, Jong-Man Kang; Korean J Crit Care Med. 2015;30(4):313-317. Published online November 30, 2015; DOI: https://doi.org/10.4266/kjccm.2015.30.4.313

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Abstract PDF

Aspiration pneumonia rarely occurs during general anesthesia; however, it can result in fatal pulmonary complications. To reduce aspiration pneumonia, a preoperative fasting time of 8 hours is recommended. A 4-year-old boy with ankyloglossia was scheduled for frenotomy. He completed preoperative fasting time and had no digestive symptoms. Pulmonary aspiration due to unexpected massive vomiting occurred during anesthesia induction. The patient’s airway was immediately secured by endotracheal tube. The vomitus in the airway tract was removed by fiberoptic bronchoscopy. Abdomen radiograph taken after this event showed paralytic ileus which can cause aspiration of gastric contents. We describe a case of pneumonia caused by aspiration of gastric contents in a pediatric patient who followed fasting instructions and who was scheduled for outpatient surgery.

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Factors associated with bronchopulmonary aspiration: a national-based study
Jaqueline Helena Tanner, Cristina Mara Zamarioli, Magda Machado de Miranda Costa, Heiko Thereza Santana, Ana Clara Ribeiro Bello dos Santos, Cleide Felicia de Mesquita Ribeiro, Fernanda Raphael Escobar Gimenes
Revista Brasileira de Enfermagem.2022;[Epub] CrossRef

Severe Hypernatremia with Craniopharyngioma - A Case Report -: Jun Bum Park, Se Hun Park, Eun Hui Seo, Hyun Seok Park, Jin Kyu Jeong; Korean J Crit Care Med. 2013;28(1):46-50.; DOI: https://doi.org/10.4266/kjccm.2013.28.1.46

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Abstract PDF: Hypernatremia, defined as a rise in the serum sodium concentration to a value exceeding 145 mM/L, is a common electrolyte disorder. Diabetes insipidus is a common cause of hypernatremia, caused by impaired production or reduced responses to vasopressin. The resultant morbidity may be inconsequential, serious, or even life-threatening. However, hypernatremia rarely occurs during anesthesia and surgery. A 45-year-old female patient with craniopharyngioma was scheduled for tumor resection. Hypernatremia (serum sodium, 170 mM/L) occurred suddenly at the end of the surgery. To treat hypernatremia, 0.45% normal saline was used. Although serum sodium concentration was reduced faster than expected, the patient did not have any complications.

Unexpected Intra-operative Pulmonary Thromboemolism during Elective Mastoidectomy: A Case Report: Hyun Jeong Kwak, Hee Yeon Park, Hong Soon Kim, Sung Ho Choi, Kyung Cheon Lee; Korean J Crit Care Med. 2009;24(3):160-163.; DOI: https://doi.org/10.4266/kjccm.2009.24.3.160

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Abstract PDF: We report on a 45-year-old patient who sustained an intra-operative pulmonary thromboembolism during elective mastoidectomy under general anesthesia. At the end of surgery, the patient developed hemodynamic compromise and exhibited T wave inversion on electrocardiogram. Echocardiography showed an echogenic mass in the right pulmonary artery and pulmonary hypertension. Pulmonary thromboembolism is rare in the field of otolaryngology and head and neck surgery; however, it may develop, resulting in a fatal outcome. It is thus important to establish the diagnosis early and prevent such serious complications.

Misconception of Bilateral Vocal Cord Paralysis as Laryngeal Spasm after Endotracheal Extubation: Bong Jae Lee, Jae Yong Jeong, Doo Ik Lee, Dong Soo Kim; Korean J Crit Care Med. 1999;14(1):47-51.

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Abstract PDF: We recently experienced an unexpected episode of bilateral vocal cord paralysis following endotracheal extubation after uvulopalatopharyngoplasty and tonsillectomy in 64-year-old man. The patient had no any other clinical manifestations regarding larynx or vocal cord except sleep apnea syndrome prior to this operation. The surgical procedure lasted almost 120 minutes and surgery and anesthesia was uneventful. After restoration of his spontaneous respiration, we tried extubation as usual method. Regardless his effort of spontaneous respiration for several times, he was suddenly apneic and showed declining of arterial oxygen saturation on the pulse oximeter (SpO2). Then we tried reintubation as a decision of laryngeal spasm. This alternative episode of extubation and reintubation was tried again and the causative factor of this respiratory impairment was confirmed as bilateral vocal cord paralysis by fiberoptic bronchoscopic examination in the operating room. Almost two thirds of vocal cord function was restored after six months of operation.

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