Acute mental status changes

Overuse of Head Computed Tomography in Cirrhosis With Altered Mental Status

BACKGROUND

Head computed tomography (CT) scans are ordered in patients with cirrhosis along with altered mental status (AMS) during admission, often, despite lack of evidence of any structural abnormality. Thus, we aimed to examine the use of head CT scans in patients with cirrhosis along with AMS and to correlate scan abnormalities with causes of AMS and physical findings.

MATERIALS AND METHODS

We defined AMS as having impaired cognition, diminished attention, reduced awareness or altered level of consciousness or all of these, and categorized AMS into the following groups: hepatic encephalopathy (HE), sepsis or infectious, metabolic, exogenous drugs or toxins, structural lesions or psychiatric abnormalities. The primary outcome was presence of any structural brain lesion on head CT scan in patients with cirrhosis along with AMS with correlation of focal neurologic deficits, specifically in patients with HE.

RESULTS

In total, 349 of 1,218 patients with cirrhosis who were admitted to the hospital had AMS; HE was the most common cause of AMS (164 of 349, 47%). A total of 64% (223 of 349) of patients with cirrhosis along with AMS underwent head CT scanning on admission, including 99 of 164 (60%) patients with HE. No patient with HE had focal neurologic findings, or a focal abnormality on head CT scan. Of the patients with focal abnormalities on CT scans, 100% had focal neurologic findings. Patients with cirrhosis along with AMS undergoing head CT scan had similar mortality (76 of 223, 34%) as those with AMS not undergoing head CT scans (47 of 126, 37%; P = nonsignificant).

CONCLUSIONS

Nearly two-thirds of patients with cirrhosis along with AMS had head CT scans performed on admission; all patients with a structural lesion on head CT scan had abnormal neurologic examinations. The data suggest that routine brain imaging in patients with cirrhosis that do not have focal neurologic findings is likely not indicated.

Identification and management of delirium in the critically ill patient with cancer

Rather than a specific entity, delirium is at the midpoint on a spectrum of potential mental status changes that ranges from full consciousness to deep coma. The extremes are relatively easy to recognize, but other points along the spectrum may go unrecognized or be misdiagnosed. If recognized and treated expeditiously, delirium may be reversed in some patients. It is imperative that those caring for critically ill patients with cancer have the knowledge and tools necessary to identify and manage delirium appropriately. Although all critically ill patients are at risk for delirium, cancer presents additional assaults to the central nervous system via direct tumor invasion or iatrogenic provocations. This article describes delirium in cancer, and addresses diagnostic and management issues across the course of the disease.

The impact of Alzheimer disease genetics on expert and advanced gerontological nursing practice

Alzheimer disease (AD), a progressive neurodegenerative disorder, is the most common cause of dementia in the United States, affecting as many as 4 million people. Extensive research is under way to identify environmental and genetic risk factors for this complex disease. Currently, four genes are associated with an increased risk for AD: the amyloid precursor protein gene on chromosome 21, the Presenilin I gene on chromosome 14, the Presenilin II gene on chromosome 1, and the apolipoprotein E gene on chromosome 19. Expert and advanced practice gerontological nurses are faced with new challenges as a result of these gene discoveries. Gerontological nurses should assess for relevant environmental and genetic risk factors; obtain comprehensive family health histories recorded as pedigrees; integrate genetic information into diagnosis, intervention, and evaluation strategies; initiate and coordinate referrals to genetic specialists; and provide ongoing emotional and decision-making support for patients and families experiencing AD.