Acute and Critical Care

Original Articles

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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Abstract PDF: 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.

Nephrology
Impact of intradialytic hypotension on mortality following the transition from continuous renal replacement therapy to intermittent hemodialysis: Seong Geun Kim, Donghwan Yun, Jinwoo Lee, Yong Chul Kim, Dong Ki Kim, Kook-Hwan Oh, Kwon Wook Joo, Yon Su Kim, Seung Seok Han; Acute Crit Care. 2023;38(1):86-94. Published online October 26, 2022; DOI: https://doi.org/10.4266/acc.2022.00948

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Abstract PDF: Background
The transition of dialysis modalities from continuous renal replacement therapy (CRRT) to intermittent hemodialysis (iHD) is frequently conducted during the recovery phase of critically ill patients with acute kidney injury. Herein, we addressed the occurrence of intradialytic hypotension (IDH) after this transition, and its association with the mortality risk. Methods: A total of 541 patients with acute kidney injury who attempted to transition from CRRT to iHD at Seoul National University Hospital, Korea from 2010 to 2020 were retrospectively collected. IDH was defined as a discontinuation of dialysis because of hemodynamic instability plus a nadir systolic blood pressure <90 mm Hg or a decrease in systolic blood pressure ≥30 mm Hg during the first session of iHD. Odds ratios (ORs) of outcomes, such as in-hospital mortality and weaning from RRT, were measured using a logistic regression model after adjusting for multiple variables. Results: IDH occurred in 197 patients (36%), and their mortality rate (44%) was higher than that of those without IDH (19%; OR, 2.64; 95% confidence interval [CI], 1.70–4.08). For patients exhibiting IDH, the iHD sessions delayed successful weaning from RRT (OR, 0.62; 95% CI, 0.43–0.90) compared with sessions on those without IDH. Factors such as low blood pressure, high pulse rate, low urine output, use of mechanical ventilations and vasopressors, and hypoalbuminemia were associated with IDH risk. Conclusions: IDH occurrence following the transition from CRRT to iHD is associated with high mortality and delayed weaning from RRT.

Case Report

A Case of Spontaneous Intracranial Hypotension with Headache and Tinnitus Treated with Epidural Blood Patch : A Case Report: Bong Jae Lee; Korean J Crit Care Med. 2006;21(2):126-130.

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Abstract PDF: Spontaneous intracranial hypotension (SIH) is a syndrome of low cerebrospinal fluid pressure characterized by postural headaches in patients without any history of dural puncture, back trauma, operative procedure, or medical illness. The clinical spectrum of SIH is quite variable and includes headache, neck stiffness, nausea, horizontal diplopia, dizziness, tinnitus, visual blurring, radicular arm pain. When the headache persists or more incapacitating, more aggressive treatment may be necessary. Autologous epidural blood patch is used in the management of SIH and highly effective. I experienced a case of 39 year old female with postural headache and tinnitus who was diagnosed as having SIH and successfully treated with epidural blood patch.

Original Articles

Midodrine for the Treatment of Hypotension in a Tetraplegic Patient with Cervical Cord Injury in ICU: A case report: Dong Woo Han, Shin Ok Koh, Yong Keyong Lee, Man Woo Lee; Korean J Crit Care Med. 2002;17(2):119-122.

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Abstract PDF: Cervical spinal cord injury results in significant dysfunction of the sympathetic nervous system. Reduced sympathetic activity below the level of spinal cord injury is associated with low resting blood pressure,orthostatic hypotension,and reflex bradycardia.Hypotension can be treated with vasoactive agents,such as dopamine,epinephrine,norepinephrine, and phenylephine .Orally administered midodrine is an alpha adrenergic receptor agonist that increases blood pressure with vasoconstriction.Its action is fast and effective in treating hypotension in patients with spinal cord injury,and it has less severe side effects.A 70-year-old tetraplegic patient with fracture and dislocation of C6-7 after a motor vehicle accident was admitted to ICU and underwent anterior cervical intervertebral body fusion.Symptomatic hypotension following postural changes was treated with intravenous infusion of dopamine,but it was difficult to reduce the dose of dopamine without causing severe hypotension.Midodrine was prescribed and the patient was well tolerated without any adverse effect.With adequately maintained blood pressure,intravenous infusion of dopamine was successfully switched to the oral midodrine.This case suggests that the midodrine is effective for the treatment of hypotension in tetraplegic patients with spinal cord injury and enables patients to participate in early rehabilitation therapies.

Acute Respiratory Distress Syndrome after Severe Hypothermia and Hypotension Due to Near Drowning: Ho Dong Park, Bon Nyeo Koo, Dong Woo Han, Seung Tak Han, Shin Ok Koh; Korean J Crit Care Med. 2001;16(2):151-155.

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Abstract PDF: The increase in short-term survival of near-drowning victims after an acute submersion episode has resulted in an increase of major complications. Two major complications are the development of acute respiratory distress syndrome and persistent hypoxic-ischemic central nervous system injury. A 43-year-old male patient was presented with acute respiratory distress syndrome after near drowning. He was severely hypothermic and hypotensive when he arrived to emergency department. His body temperature was 24oC. There was no pulse and no spontaneous respiration. He was treated with advanced life support measure. He was intubated and vasoactive drugs such as epinephrine and norepinephrine were used. On ICU admission, his blood pressure and pulse rate were 80/40 mmHg, 170 beats/min respectively. His oxygen saturation was 40~60% with 100% oxygen. We applied 16~30 cmH2O of PEEP with low tidal volume for recruitment. Patient was flipped over to prone position. Solu-medrol 1.0 g was infused. The blood pressure restored to 140/50 mmHg, and the pulse rate was normalized to 100 beats/min. The dose of vasopressors and inotropes were reduced and stopped 5 hour after the arrival. When the oxygenation has improved, the position was changed to supine and PEEP was lowered. Eventually weaning was successful. Brain MRI and EEG showed global atrophy of cerebral cortex and moderate diffuse brain dysfunction respectively. He received tracheostomy since he was semi-comatose. He was transferred to general ward on 39th ICU day.

Case Report

Cardiac Arrest Following Methylmethacrylate Bone Cement during Total Hip Replacement: A case report: Sang Bum Kim, Hong Lee, Seong Tae Kim, Chang Kun An; Korean J Crit Care Med. 1998;13(2):249-253.

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Abstract PDF: Cardiovascular reactions to acrylic bone cement in patients with total hip replacement are a common complication. Hypotension and arrhythmias are the most frequently observed symptoms. Elderly patients with fractures of the femoral neck constitute a special risk group. In some patients these reactions will be fatal. The mechanisms suggested to explain these reactions are embolism of air, polymer or fat, reaction to the heat, and toxic or vasodilating effects of the acrylic monomer. It may be that potentially lethal complications only occur if two or more of the predisposing factors (hypovolemia, myocardial insufficiency, arrhythmia, embolism, histamine release) are present simultaneously. We have experienced a case of complication following bone cement insertion under spinal anesthesia. This female patient was 91 years old with old myocardial infarction on EKG.

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