David Y. Hwang

Is the parietal lobe necessary for recollection in humans

An intriguing puzzle in cognitive neuroscience over recent years has been the common observation of parietal lobe activation in functional neuroimaging studies during the performance of human memory tasks. These findings have surprised scientists and clinicians because they challenge decades of established thinking that the parietal lobe does not support memory function. However, direct empirical investigation of whether circumscribed parietal lobe lesions might indeed be associated with human memory impairment has been lacking. Here we confirm using functional magnetic resonance imaging that significant parietal lobe activation is observed in healthy volunteers during a task assessing recollection of the context in which events previously occurred. However, patients with parietal lobe lesions that overlap closely with the regions activated in the healthy volunteers nevertheless exhibit normal performance on the same recollection task. Thus, although the processes subserved by the human parietal lobe appear to be recruited to support memory function, they are not a necessary requirement for accurate remembering to occur.

End-of-life care in the curriculum: a national study of medical education deans.

Purpose. To describe attitudes and practices of end-of-life care teaching in the undergraduate medical curriculum in the United States as reported by administrative leadership and identify opportunities for improvement. Method. A telephone survey of associate deans for medical education or curricular affairs at a random sample of 62 accredited U.S. medical schools was conducted in 2002. Results. Fifty-one deans participated (82% response rate). Most (84%) described end-of-life care education as “very important” and supported incorporating more end-of-life care teaching into the undergraduate curriculum. Sixty-seven percent reported that insufficient time is currently given to palliative care in their curriculum. Although a majority opposed required courses (59%) or clerkships (70%) that focused on end-of-life care, they did unanimously endorse integrating teaching end-of-life care into existing courses or clerkships. Key barriers to incorporating more end-of-life care into the curriculum included lack of time in the curriculum, lack of faculty expertise, and absence of a faculty leader. Conclusion. Associate deans for medical education or curricular affairs in the United States support integrating end-of-life care content into existing courses and clerkships throughout the undergraduate medical curriculum. Successful integration will require institutional investment in faculty development, including both the development of faculty leaders to drive change efforts, and the education of all faculty who teach students and exert influence as role models and mentors. The strong support for end-of-life care education expressed by academic leaders in this study, combined with the high level of interest expressed in the authors’ 2001 national survey of students, provide evidence of the potential for meaningful change in the undergraduate medical curriculum.

Comparative sensitivity of computed tomography vs. magnetic resonance imaging for detecting acute posterior fossa infarct.

BACKGROUND Posterior fossa strokes, particularly those related to basilar occlusion, pose a high risk for progression and poor neurological outcomes. The clinical history and examination are often not adequately sensitive or specific for detection. STUDY OBJECTIVES Because this population stands to benefit from acute interventions such as intravenous and intra-arterial tissue plasminogen activator, mechanical thrombectomy, and intensive monitoring for neurologic deterioration, this study examined the sensitivity of non-contrast head computed tomography (NCCT) for diagnosing posterior fossa strokes in the emergency department. METHODS This study analyzed a prospectively collected database of acute ischemic stroke patients who underwent head NCCT within 30 h of symptom onset and who were subsequently found to have a posterior fossa infarct on brain magnetic resonance imaging (MRI) performed within 6 h of the NCCT. RESULTS There were 67 patients identified who had restricted diffusion on MRI in the posterior fossa. The National Institutes of Health Stroke Scale (NIHSS) scores ranged from 0 to 36, median 3. Only 28 patients had evidence of infarction on the initial NCCT scan. The timing of NCCT scans ranged from 1.2 to 28.9 h after symptom onset. The sensitivity of NCCT was 41.8% (95% confidence interval 30.1-54.4). The longest period of time between symptom onset and a negative NCCT with a subsequent positive diffusion-weighted imaging MRI was 26.7 h. CONCLUSIONS Head NCCT imaging is frequently insensitive for detecting posterior fossa infarction. Temporal evolution of strokes in this distribution, coupled with beam-hardening artifact, may contribute to this limitation. When a posterior fossa stroke is suspected and the NCCT is non-diagnostic, MRI is the preferred imaging modality to exclude posterior fossa infarction.

The brain basis for episodic memory: Insights from functional MRI, intracranial EEG, and patients with epilepsy

This article reviews the contributions that functional magnetic resonance imaging (fMRI), intracranial electroencephalography (iEEG), and patient studies have made to our current understanding of how memory functions arise from the brain. First, we briefly discuss the current classification of different memory systems and their neuroanatomical correlates, focusing on episodic memory and evidence from lesion studies. We then survey both fMRI and iEEG studies of memory function. For each modality, we discuss its physiological basis, as well as point out key studies that have led to new insights regarding memory. Advantages and disadvantages of each brain mapping modality are addressed. Wherever appropriate, we point out implications these studies have for the treatment of patients with epilepsy. We conclude this review with further discussion regarding the potential for combining fMRI and iEEG techniques in future investigations of memory function.

Assessment of satisfaction with care among family members of survivors in a neuroscience intensive care unit.

ABSTRACT Many prior nursing studies regarding family members specifically of neuroscience intensive care unit (neuro-ICU) patients have focused on identifying their primary needs. A concept related to identifying these needs and assessing whether they have been met is determining whether families explicitly report satisfaction with the care that both they and their loved ones have received. The objective of this study was to explore family satisfaction with care in an academic neuro-ICU and compare results with concurrent data from the same hospital’s medical ICU (MICU). Over 38 days, we administered the Family Satisfaction-ICU instrument to neuro-ICU and MICU patients’ families at the time of ICU discharge. Those whose loved ones passed away during ICU admission were excluded. When asked about the respect and compassion that they received from staff, 76.3% (95% CI [66.5, 86.1]) of neuro-ICU families were completely satisfied, as opposed to 92.7% in the MICU (95% CI [84.4, 101.0], p = .04). Respondents were less likely to be completely satisfied with the courtesy of staff if they reported participation in zero formal family meeting. Less than 60% of neuro-ICU families were completely satisfied by (1) frequency of physician communication, (2) inclusion and (3) support during decision making, and (4) control over the care of their loved ones. Parents of patients were more likely than other relatives to feel very included and supported in the decision-making process. Future studies may focus on evaluating strategies for neuro-ICU nurses and physicians to provide better decision-making support and to implement more frequent family meetings even for those patients who may not seem medically or socially complicated to the team. Determining satisfaction with care for those families whose loved ones passed away during their neuro-ICU admission is another potential avenue for future investigation.

Anxiety and depression symptoms among families of adult intensive care unit survivors immediately following brief length of stay

PURPOSE Prior studies of anxiety and depression among families of intensive care unit patients excluded those admitted for less than 2 days. We hypothesized that families of surviving patients with length of stay less than 2 days would have similar prevalence of anxiety and depression compared with those admitted for longer. MATERIALS AND METHODS One hundred six family members in the neurosciences and medical intensive care units at a university hospital completed the Hospital Anxiety and Depression Scale at discharge. RESULTS The 106 participants represented a response rate of 63.9% among those who received surveys. Fifty-eight surveys (54.7%) were from relatives of patients who were discharged within 2 days of admission, whereas 48 (45.3%) were from those admitted for longer. No difference in anxiety was detected; prevalence was 20.7% (95% confidence interval, 10.4) among shorter stay families and 8.3% (7.8) among longer stay families (P = .10). No difference was also seen with depression; prevalence was 8.6% (7.2) among shorter stay families and 4.2% (5.7) among longer stay families (P = .45). CONCLUSIONS Families of surviving patients with brief length of stay may have similar prevalence of anxiety and depression at discharge to those with longer length of stay.

Patient Preferences and Surrogate Decision Making in Neuroscience Intensive Care Units.

In the neuroscience intensive care unit (NICU), most patients lack the capacity to make their own preferences known. This fact leads to situations where surrogate decision makers must fill the role of the patient in terms of making preference-based treatment decisions, oftentimes in challenging situations where prognosis is uncertain. The neurointensivist has a large responsibility and role to play in this shared decision-making process. This review covers how NICU patient preferences are determined through existing advance care documentation or surrogate decision makers and how the optimum roles of the physician and surrogate decision maker are addressed. We outline the process of reaching a shared decision between family and care team and describe a practice for conducting optimum family meetings based on studies of ICU families in crisis. We review challenges in the decision-making process between surrogate decision makers and medical teams in neurocritical care settings, as well as methods to ameliorate conflicts. Ultimately, the goal of shared decision making is to increase knowledge amongst surrogates and care providers, decrease decisional conflict, promote realistic expectations and preference-centered treatment strategies, and lift the emotional burden on families of neurocritical care patients.

Assessment of Brain Death in the Neurocritical Care Unit

This article reviews current guidelines for death by neurologic criteria and addresses topics relevant to the determination of brain death in the intensive care unit. The history of brain death as a concept leads into a discussion of the evolution of practice parameters, focusing on the most recent 2010 update from the American Academy of Neurology and the practice variability that exists worldwide. Proper transition from brain death determination to possible organ donation is reviewed. This review concludes with a discussion regarding ethical and religious concerns and suggestions on how families of patients who may be brain dead might be optimally approached.

Timing of Percutaneous Endoscopic Gastrostomy for Acute Ischemic Stroke: An Observational Study From the US Nationwide Inpatient Sample.

Background and Purpose— Stroke guidelines recommend time-limited trials of nasogastric feeding prior to percutaneous endoscopic gastrostomy (PEG) tube placement. We sought to describe timing of PEG placement and identify factors associated with early PEG for acute ischemic stroke. Methods— We designed a retrospective observational study to examine time to PEG for ischemic stroke admissions in the Nationwide Inpatient Sample, 2001 to 2011. We defined early PEG placement as 1 to 7 days from admission. Using multivariable regression analysis, we identified the effects of patient and hospital characteristics on PEG timing. Results— We identified 34 623 admissions receiving a PEG from 2001 to 2011, 53% of which received the PEG 1 to 7 days from admission. Among hospitals placing ≥10 PEG tubes, median time to PEG for individual hospitals ranged from 3 days to over 3 weeks (interquartile range 6–8.5 days). Older adult age groups were associated with early PEG (≥85 years versus 18–54 years: adjusted odds ratio 1.68, 95% confidence interval 1.50–1.87). Those receiving a PEG and tracheostomy were more likely to receive the PEG beyond 7 days, and these patients were more often younger compared with PEG only recipients. Those admitted to high-volume hospitals were more likely to receive their PEG early (≥350 versus <150 hospitalizations; adjusted odds ratio 1.26, 95% confidence interval 1.17–1.35). Conclusions— More than half of the PEG recipients received their surgical feeding tube within 7 days of admission. The oldest old, who may benefit most from time-limited trials of nasogastric feeding for ≥2 to 3 weeks, were most likely to receive a PEG within 7 days.

Medical Management of the Severe Traumatic Brain Injury Patient

Severe traumatic brain injury (sTBI) is a major contributor to long-term disability and a leading cause of death worldwide. Medical management of the sTBI patient, beginning with prehospital triage, is aimed at preventing secondary brain injury. This review discusses prehospital and emergency department management of sTBI, as well as aspects of TBI management in the intensive care unit where advances have been made in the past decade. Areas of emphasis include intracranial pressure management, neuromonitoring, management of paroxysmal sympathetic hyperactivity, neuroprotective strategies, prognostication, and communication with families about goals of care. Where appropriate, differences between the third and fourth editions of the Brain Trauma Foundation guidelines for the management of severe traumatic brain injury are highlighted.