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Biomedical subjects

M A McCabe

Publications and source records attributed to M A McCabe.

At least 19 recordsLinked to original sources
PubMed2001

Quantification of cytomegalovirus (CMV) viral load by the hybrid capture assay allows for early detection of CMV disease in lung transplant recipients.

BACKGROUND: We prospectively compared the hybrid capture system (HCS) assay with conventional cell culture and shell vial assay for the detection of cytomegalovirus (CMV) infection and disease in the lung transplant population. METHODS: Between January 1999 and February 2000, 34 lung transplant patients at Loyola University Medical Center, who were considered to be at risk for CMV disease, underwent surveillance testing for CMV cell culture, shell vial assay and HCS assay according to a pre-determined schedule. In addition, bronchoscopy with bronchoalveolar lavage (BAL) and transbronchial biopsy were performed at regular intervals and for clinical indications. All BAL samples were sent for CMV cultures and biopsy specimens were analyzed for histopathologic evidence of CMV by immunoperoxidase staining using antibody to early immediate nuclear antigen. RESULTS: Ten patients developed CMV disease/syndrome during the course of the study. The sensitivity, specificity, positive predictive value and negative predictive value were >90% for the HCS assay. The sensitivity of the HCS assay (90%) was statistically significantly higher than the sensitivity of either the SV assay (40%) or the cell culture (50%). In addition, the HCS assay was able to detect CMV 50 +/- 67 days prior to clinical evidence of CMV disease and an average of 36 days prior to the other detection techniques. CONCLUSION: The HCS assay is a sensitive diagnostic technique able to reliably detect CMV disease earlier than other diagnostic methods in the lung transplant population. Future studies may be able to evaluate whether pre-emptive anti-viral therapy targeted to specific viral loads using the HCS assay will be beneficial in preventing morbidity associated with CMV disease.

Adult↗
PubMed2001

Care before and after lung transplant and quality of life research.

Lung transplantation is a growing surgical option for patients with end-stage lung and pulmonary vascular diseases. After completing an extensive evaluation and meeting the selection criteria, patients are listed for either single or bilateral-sequential lung transplantation. Immediate postoperative management requires detailed attention to fluid management, monitoring for infection, reperfusion injury, pulmonary hygiene, and pain management. Length of stay depends on the patient's condition before transplant and postoperative complications. Discharge from the hospital can be as early as 7 days after transplantation. Newer immunosuppressive medications offer more options for treating and preventing rejection. Advanced practice nurses, such as coordinators, case managers, nurse practitioners, and clinical nurse specialists, are uniquely positioned to play key roles in coordinating the care of transplant patients across settings and both before and after the transplant procedure. The perioperative needs of lung transplant patients and the impact of this complex procedure on the recipients' and family's quality of life merit further investigation by clinicians and researchers.

Humans↗
PubMed2000

Liberalization of donor criteria may expand the donor pool without adverse consequence in lung transplantation.

BACKGROUND: Currently the most important limitation in lung transplantation is donor availability. Although liberalization of donor criteria may aid in expanding the donor pool, the long-term effects of the use of "marginal" or "extended" donors remains unexplored. METHODS: In this study, we included all patients who underwent lung transplantation from January 1996 to December 1999 at Loyola University Medical Center. We categorized patients as either receiving lungs from an "ideal" donor or an "extended" donor. Extended donors were defined as having any 1 of the following criteria: donor age > 55 years, tobacco history > 20 pack years, presence of infiltrate on chest x-ray, donor ventilator time > 5 days, or donor use of inhaled drugs (cocaine or marijuana). We then compared the 2 groups with regard to short-term (operating room [OR] complications, intensive care unit [ICU] complications) and long-term outcomes (1-year pulmonary function and survival). RESULTS: Sixty-one (54%) patients received lungs from ideal donors and 52 (46%) patients received lungs from extended donors as defined above. We observed no significant differences between the 2 groups in OR complications (cardiopulmonary bypass, bleeding complications, life-threatening arrhythmias) or ICU complications (pneumonia, airway dehiscence, reoperation within 30 days related to transplantation). In addition, the 2 groups had similar median intubation times (21 hours in the ideal donor group and 20 hours in the extended donor group; p = n.s.), hospital length of stay (14+/-12 days in the ideal donor group and 12+/-8 days in the extended donor group; p = n.s.), and hospital survival (80% and 88% in the ideal and extended donor groups, respectively). One-year follow-up revealed similar pulmonary function (forced expiratory volume in 1 sec [FEV(1)] = 2.4 liters and 2.4 liters in the recipients of bilateral ideal and extended donors, respectively, and FEV(1) = 1.9 liters and 1.5 liters in the recipients of single ideal and extended donors) and survival (72% and 79% in the ideal and extended donor groups, respectively; p = n.s.) between the 2 groups. CONCLUSIONS: Liberalization of donor criteria does not affect outcome in the first year after lung transplantation. By liberalizing donor criteria, we can expand the donor pool while assessing other possible mechanisms to increase donor availability.

Age Factors↗
PubMed1999

Family functioning, neurocognitive functioning, and behavior problems in children with sickle cell disease.

OBJECTIVE: To investigate the independent and combined contributions of neurocognitive and family functioning to mother-reported behavior problems in children with sickle cell disease (SCD) and evaluate the factor structure of the Family Environment Scale (FES) with African American families. METHOD: The study sample included 289 children enrolled in the multisite Cooperative Study of Sickle Cell Disease. The study protocol included neuropsychological evaluation and brain magnetic resonance imaging (MRI) of the children, and mothers completed the Child Behavior Checklist and Family Environment Scale. RESULTS: With child and maternal demographic parameters controlled, conflicted family functioning, but not neurocognitive functioning, accounted for a significant portion of the variance in mother-reported behavior problems. The factor structure of the FES for families of children with SCD was found to be similar to that for other families. CONCLUSIONS: Family functioning may be a salient target for fostering adaptation to chronic childhood illness.

Adaptation, Psychological↗
PubMed1998

Risk of abuse of diphenhydramine in children and adolescents with chronic illnesses.

Diphenhydramine is generally considered an innocuous drug with a minimal risk for abuse and untoward side effects. We describe children and adolescents with chronic hematologic and oncologic diseases who exhibited drug-seeking behavior or anticholinergic symptoms with the use of diphenhydramine. These cases illustrate that the assumption that this drugs is without significant adverse effects may be unwarranted, especially for children and adolescents with chronic diseases.

Adolescent↗
PubMed1997

Rapid deconvolution of NMR powder spectra by weighted fast Fourier transformation.

The resolution enhancement conferred by numerical deconvolution of powder pattern spectra to spectra characteristic of a single alignment greatly simplifies solid state NMR spectral analysis. This is especially beneficial when the spectrum is a superposition of signals from multiple environments or sites of labelling. We have developed an innovative method to deconvolute (depake) spectra governed by axially symmetric second rank tensor interactions which possess a P2(cos theta) dependence upon orientation, where theta is the angle between the symmetry axis and the external magnetic field. Our approach differs substantially from previously published procedures which are iterative or require matrix inversion and, hence, are slow. The new method, instead, utilizes weighting functions in time and frequency domains to facilitate a rapidly executed solution based upon fast Fourier transformation (FFT). Its efficacy is demonstrated with 2H and 31P NMR data for model membranes.

Fourier Analysis↗
PubMed1996

Involving children and adolescents in medical decision making: developmental and clinical considerations.

Outlined the issues in informed consent, as well as goals for involving children and adolescents in decisions regarding their own medical treatment. This paper reviews the developmental and clinical considerations, and provides recommendations, for determining particular children's level of involvement. Finally, there are distinct roles for pediatric psychologists in this process, which are described. As medical treatment becomes increasingly sophisticated, there is an obligation for pediatric psychologists to appreciate the ethical and clinical issues in medical decision making for families.

Adolescent↗
PubMed1994

2H NMR studies of isomeric omega 3 and omega 6 polyunsaturated phospholipid membranes.

The properties of aqueous multilamellar dispersions of [2H31]16:0-alpha 18:3 PC (1-[2H31]palmitoyl-2-cis,cis,cis-octa-9,12,15- trienoylphosphatidylcholine) and of [2H31]16:0-gamma 18:3 PC (1-[2H31]palmitoyl-2-cis,cis,cis-octa-6,9,12-trienoylphosphatid ylcholine) were compared by broadline 2H NMR spectroscopy. These isomeric phospholipids differ only in the location of the unsaturations in the sn-2 chain. The alpha 18:3 chain has double bonds at delta 9, 12, and 15 positions whereas in the gamma 18:3 chain they are at positions delta 6, 9, and 12. Moment analysis of spectra recorded as a function of temperature reveals dramatically distinct phase behavior for the two isomers. The gel to liquid crystalline transition for [2H31]16:0-alpha 18:3 PC membranes exhibits broad hysteresis which is characterized by a mid point temperature of -9 degrees C and -20 degrees C on heating and cooling, respectively. In contrast, the phase transition of [2H31]16:0-gamma 18:3 PC membranes does not exhibit hysteresis and occurs over a lower temperature range centred on -27 degrees C. Appreciably different molecular ordering also exists within the membranes in the liquid crystalline state. Average order parameters SCD are smaller in [2H31] 16:0-alpha 18:3 PC than in [2H31]16:0-gamma 18:3 PC by 10% at the same temperature and by 20% at equal reduced temperature. Smoothed order parameter profiles generated from depaked spectra clarify the nature of the difference.(ABSTRACT TRUNCATED AT 250 WORDS)

Deuterium↗
PubMed1994

Primary and secondary control among children undergoing medical procedures: adjustment as a function of coping style.

The literature suggests that optimal adjustment to relatively uncontrollable stressors may require adjusting oneself to the stressors rather than trying to alter them. This possibility was explored, for low-controllability stressors (e.g., painful medical procedures) associated with leukemia. Children's reports of coping strategies and goals were classified as primary control coping (attempts to alter objective conditions), secondary control coping (attempts to adjust oneself to objective conditions), or relinquished control (no attempt to cope). Secondary control coping was positively associated with (a) general behavioral adjustment assessed by the Child Behavior Checklist and (b) illness-specific adjustment assessed by children's own distress ratings and by behavioral observations during painful procedures. All significant group differences showed better adjustment among secondary control children than among the primary or relinquished groups.

Adaptation, Psychological↗
PubMed1994

Quality of long-term survival in young children with medulloblastoma.

The reported success of treatment for children with medulloblastoma must be balanced against the effect that treatment has on the quality of life of long-term survivors. The outcome of long-term survivors reported in previous studies has been conflicting. The authors evaluate the mental and behavioral skills of a group of medulloblastoma survivors from their institution, all of whom had survived for more than 5 years postdiagnosis. A review of the institutional records yielded 32 patients. Twenty-three families were interviewed by telephone and, of these, 13 subjects came to the hospital for detailed neuropsychological and neurological evaluations. Intelligence quotient (IQ) was less than 90 for all participants tested, and patients diagnosed before the age of 3 years had lower IQ scores on average than those diagnosed later. Mean IQ and achievement test scores in reading, spelling, and mathematics were all higher in survivors who had undergone shunting. Achievement test results were often not in accord with intellectual potential, and individual intellectual skills varied widely. Perceptual-motor task performance was below average in more than 50% of the participants, but motor dexterity was more severely affected than perception. Problems in learning and a delay in both physical growth and development were seen in a majority of participants. This study directs attention to the serious difficulties faced by long-term survivors of medulloblastoma and their families, and underscores the importance of routine neuropsychological testing. Moreover, the study provides further impetus to seek alternatives to irradiation in the treatment of malignant brain tumors.

Adolescent↗
PubMed1993

Measurement of nutrient intake by deuterium dilution in premature infants.

To assess whether a simple nonrestrictive method of determining nutrient intake could be applied to premature infants, we compared actual measured formula intake during a 7-day period with intake calculated from deuterium dilution in 13 hospitalized, growing, premature newborn infants. An oral dose of deuterium oxide (D2O) was administered, and urine samples were analyzed by deuterium nuclear magnetic resonance spectrometry for D2O concentration. Using an exponential model, we calculated formula intake from the decline in D2O concentration during the 7-day study period. Intake as assessed by the deuterium model correlated well with actual intake (r = 0.93; p < 0.001). However, because the deuterium dilution model measures both dietary and nondietary water intake (metabolic and cutaneous water influx), deuterium dilution-derived intake exceeded actual intake by 25 +/- 18 ml/kg per day (16% +/- 11%). When corrections were applied to account for nondietary water intake, deuterium dilution-derived nutrient intake (160 +/- 30 ml/kg per day) closely approximated actual intake (155 +/- 17 ml/kg per day). If corrections are made for nondietary water intake, the deuterium dilution method may be a useful nonrestrictive method of measuring nutrient intake in a variety of neonatal populations.

Anthropometry↗
PubMed1992

Bronchial dehiscence associated with a large broncholith in a lung transplant recipient.

A 63-year-old man who underwent single lung transplantation for advanced emphysema had a postoperative course complicated by asymptomatic bronchial dehiscence associated with a large broncholith. The stone eventually caused airway obstruction requiring partial fragmentation and incomplete extrication. We suggest that calcified nodes of significant size be removed at the time of surgery in the lung transplant recipient.

Bronchial Diseases↗
PubMed1981

The growth-promoting effect of bacterial iron for serum-exposed bacteria.

Bacterial ability to obtain iron in bovine serum or in media containing transferrin (Tr) or conalbumin (Ca) was investigated by using serum-resistant (virulent) and serum-sensitive (avirulent) strains of Escherichia coli and Salmonella typhimurium. Bacteria growing in bovine serum enriched with radioactive iron-saturated Tr or with radioactive iron-saturated enterobactin (E) did not acquire radioactive iron. It has been found that the passage of siderophore (Si)-iron complexes into bacteria is blocked in serum by Tr and in Ca-containing medium by Ca. The investigation of bacterial ability to take iron in synthetic media showed that bacteria take in Si-bound but no Tr-bound radioactive iron. In the absence of free iron, the growth of serum-exposed virulent bacteria was supported by their stored iron. Virulent bacteria passaged in medium void of usable iron became depleted in stored iron and did not grow in animal sera unless sera were enriched by the addition of exogenous iron. Experiments with serum-exposed avirulent bacteria showed that their growth in Si-enriched serum should not be attributed to the iron-providing activity of Si but to the stimulating effect of Si which facilitates the use of stored iron. As distinct from avirulent bacteria, virulent bacteria used stored iron without the stimulating activity of extracellular Si.

Blood↗
PubMed1978

Determinants of lengths of outpatient visits in a prepaid group practice setting.

In this paper we have examined the amount of time that physicians (MDs) and physician's assistants (PAs) expended on office visits. The purpose was to determine the extent to which a series of patient-related and system-related characteristics explain variations in that time. Using regression analyses, we found most of the explained variation generally to be due to system-related characteristics. Whether the provider was an MD or PA made little difference in the length of time spent with patients. The principal determinant of provider time for unscheduled and scheduled 15-minute visits was the patient-load (number of patients per minute); for scheduled 30-minute visits, the number of associated morbidities was relatively more important than patient-load. Discriminant analysis was used to identify factors that could distinguish PA visits that require an MD input from those that do not. The data were collected from three months of observation in the department of medicine of a prepaid group practice.

Ambulatory Care↗