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Biomedical subjects

D A Tucker

Publications and source records attributed to D A Tucker.

12 recordsLinked to original sources
PubMed2001

Effect of stimulus intensity level on auditory middle latency response brain maps in human adults.

Auditory middle latency response (AMLR) brain maps were obtained in 11 young adults with normal hearing. AMLR waveforms were elicited with monaural clicks presented at three stimulus intensity levels (50, 70, and 90 dB nHL). Recordings were made for right and left ear stimulus presentations. All recordings were obtained in an eyes open/awake status for each subject. Peak-to-peak amplitudes and absolute latencies of the AMLR Pa and Pb waveforms were measured at the Cz electrode site. Pa and Pb waveforms were present 100 percent of the time in response to the 90 dB nHL presentation. The prevalence of Pa and Pb to the 70 dB nHL presentation varied from 86 to 95 percent. The prevalence of Pa and Pb to the 50 dB nHL stimulus never reached 100 percent, ranging in prevalence from 77 to 68 percent. No significant ear effect was seen for amplitude or latency measures of Pa or Pb. AMLR brain maps of the voltage field distributions of Pa and Pb waveforms showed different topographic features. Scalp topography of the Pa waveform was altered by a reduction in stimulus intensity level. At 90 dB nHL, the Pa brain map showed a large positivity midline over the frontal and central scalp areas. At lower stimulus intensity levels, frontal positivity was reduced, and scalp negativity over occipital regions was increased. Pb scalp topography was also altered by a reduction in stimulus intensity level. Varying the stimulus intensity significantly altered Pa and Pb distributions of amplitude and latency measures. Pa and Pb distributions were skewed regardless of stimulus intensity.

Adult↗
PubMed1999

Chest pain. How serious is it?

The very thought of chest pain often brings terror to patients and health care providers. Chest pain typically invokes a "worst case" scenario of massive myocardial infarction (MI) resulting from cardiovascular disease (CD) and requiring immediate medical attention. However, chest pain is a common complaint suffered by most people at some time in their lives. People complaining of chest pain may be young, middle-aged, or elderly, and they may or may not be under a health care provider's care. Chest pain may be a symptom of a variety of disorders other than CD. Therefore it is helpful to differentiate quickly between the types of chest pain to determine whether immediate assistance is necessary.

Chest Pain↗
PubMed1998

Health care providers riding the information superhighway.

Telehealth is the practice of providing health care services to people who are distant from the provider by the use of telecommunications and information technology. These services include client care, consultations, education, and research. Concerns include financial cost, reimbursement, liability, licensure, and confidentiality. Research to document treatment cost-effectiveness and efficacy is ongoing.

Community Health Nursing↗
PubMed1996

Effects of age, signal level, and signal rate on the auditory middle latency response.

The effects of age, signal rate, and signal level on the maturing auditory middle latency response (AMLR) were evaluated in 50 normal-hearing subjects ranging in age from 2 days to 35 years. Ipsilateral and contralateral AMLR waveforms were recorded in newborns (n = 10), children (n = 10), preteens (n = 10), teens (n = 10), and adults (n = 10). The AMLR Pa waveform was obtained in 70 to 100 percent of all subjects. The variables of age, signal level, and site of recording significantly affected Pa peak amplitude and absolute latency. However, stimulus rate did not significantly affect the response.

Adolescent↗
PubMed1992

Basal forebrain neurons and memory: a biochemical, histological, and behavioral study of differential vulnerability to ibotenate and quisqualate.

The differential vulnerability of basal forebrain cells to ibotenate (IBO) or quisqualate (QUIS) was investigated in rats. IBO was also coinjected with cystine (CYS) or zinc (Zn). Cortical choline acetyltransferase (ChAT) and glutamate decarboxylase (GAD) activity, neurotensin receptors, and high-affinity choline uptake sites were quantified in conjunction with radioimmunoassays for neurotensin, substance P, and somatostatin; immunocytochemistry for neurotensin-, somatostatin-, Leu-enkephalin-, and ChAT-positive cells; and in situ hybridization histochemistry of somatostatin, substance P, and enkephalin mRNAs. Compared with the performance of controls, continuous alternation performance in a T maze of IBO+Zn or IBO+CYS rats was better than that of IBO rats, whereas the performance of QUIS rats was unimpaired. Of those neurotransmitter systems examined, only ChAT-immunoreactive cells were vulnerable to IBO or QUIS. However, cholinergic cell loss did not correlate with impaired performance.

Animals↗
PubMed1992

Working with the patient designated "Do not resuscitate"--how the nurse copes.

In conclusion, this study describes coping mechanisms used by the nurse when caring for DNA patients. These coping mechanisms are of two types: caring for the patient and caring for the family. Coping mechanisms used when caring for the patient include spending minimal time, avoidance, depersonalization, being present at death, and grooming the patient. Coping mechanisms used when caring for the family include personalization of care and giving information to the family. An understanding of coping strategies used by nurses in caring for DNA patients may assist staff in recognizing and dealing with feelings associated with this stressful phenomenon.

Adaptation, Psychological↗
PubMed1986

Sensory evoked responses in the intensive care unit.

Within the past decade, sensory evoked responses (SERs) have been increasingly applied in acute brain injury. In this paper, we present the rationale for this clinical application and discuss principles and practices that are important for successful measurement and interpretation of sensory evoked responses (SERs) in the intensive care unit. Fundamentals of pathophysiology and management of acute brain injury are reviewed. Varied uses of SERs in brain-injured children and adults are illustrated with case reports. Our experience suggests that SER measurement in acute brain injury is clinically challenging yet rewarding. We conclude that, with sufficient preparation, the audiologist can assume an important position on the intensive care unit team in acute management of brain injury.

Adolescent↗
PubMedDate not supplied

The student process for success: the nursing care plan.

Written nursing care plans are designed to focus students on individualizing nursing care, which promotes critical thinking and decision making. In actual practice, emphasis has shifted from care plans toward standards of care. The authors discuss a concise, simplified care plan format that includes both standards of care and collaborative problems. This plan of care is compatible with healthcare regulations and requires less time to produce and evaluate.

Clinical Competence↗
PubMedDate not supplied

Strategies for getting students on the information superhighway.

Many nurses indicate that they lack the formal education needed to use resources such as the Internet and computer technology related to healthcare. The results of a survey at a baccalaureate school of nursing revealed that although nearly 100% of those surveyed used computers, very few effectively used available Internet resources. In response, the authors implemented strategies to make available Internet resources "user-friendly" for communication and information gathering.

Computer Communication Networks↗