Cognitive deficits related to major organ failure: the potential role of neuropsychological testing

Relationship between Cognitive Function, Depression/Anxiety and Functional Parameters in Patients Admitted for Congestive Heart Failure

Cognitive impairment, anxiety and depression have been described in patients with congestive heart failure (CHF). We analyzed in-hospital CHF patients before discharge with neuropsychological tests attempting to correlate with prognostic parameters.

METHODS

All subjects underwent a mini mental state examination (MMSE), geriatric depression scale (GDS), anxiety and depression scale test (HADS). We evaluated NYHA class, brain natriuretic peptide (BNP), left ventricular ejection fraction (LVEF) and non-invasive cardiac output (CO).

RESULTS

Three-hundred and three CHF patients (age 71.6 ys) were analysed. The mean NYHA class was 2.9±0.8, LVEF was 43.4±15.8%; BNP plasma level and CO were calculated as 579.8±688.4 pg/ml and 3.9±1.1 l/min, respectively. In 9.6% a pathological MMSE score emerged; a depression of mood in 18.2% and anxiety in 23.4% of patients were observed. A significant correlation between MMSE and age (r=0.11 p=0.001), BNP (r=0.64 p=0.03) but not between MMSE and NYHA class and LVEF was observed. GDS and HADS were inversely correlated with NYHA class (r=0.38 p=0.04) and six-minute walking test (r=0.18 p=0.01) without an association with objective parameters in CHF (BNP, LVEF and cardiac output). At multivariate analysis only MMSE and BNP are inversely correlated significantly (p=0.019 OR=-0.64, CI=-042-0.86).

CONCLUSIONS

in-hospital CHF patients may manifest a reduction of MMSE and important anxiety/depression disorders. The results of the study suggest that the presence of cognitive impairment in older CHF patients with higher BNP plasma level should be considered. In admitted CHF patients anxiety and depression of mood are commonly reported and influenced the perception of the severity of illness.

Peak oxygen uptake and left ventricular ejection fraction, but not depressive symptoms, are associated with cognitive impairment in patients with chronic heart failure

BACKGROUND

The aim of the present study was to assess cognitive impairment in patients with chronic heart failure (CHF) and its associations with depressive symptoms and somatic indicators of illness severity, which is a matter of controversy.

METHODS AND RESULTS

Fifty-five patients with CHF (mean age 55.3 ± 7.8 years; 80% male; New York Heart Association functional class I-III) underwent assessment with an expanded neuropsychological test battery (eg, memory, complex attention, mental flexibility, psychomotor speed) to evaluate objective and subjective cognitive impairment. Depressive symptoms were assessed using the Structured Clinical Interview for Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (SCID) and a self-report inventory (Hospital Anxiety and Depression Scale [HADS]). A comprehensive clinical dataset, including left ventricular ejection fraction, peak oxygen uptake, and a 6-minute walk test, was obtained for all patients. Neuropsychological functioning revealed impairment in 56% of patients in at least one measure of our neuropsychological test battery. However, the Mini Mental State Examination (MMSE) could only detect cognitive impairment in 1.8% of all patients, 24% had HADS scores indicating depressive symptoms, and 11.1% met SCID criteria for a depressive disorder. No significant association was found between depressive symptoms and cognitive impairment. Left ventricular ejection fraction was related to subjective cognitive impairment, and peak oxygen uptake was related to objective cognitive impairment.

CONCLUSION

Cognitive functioning was substantially reduced in patients with CHF and should therefore be diagnosed and treated in routine clinical practice. Caution is advised when the MMSE is used to identify cognitive impairment in patients with CHF.

Correlation between Cognitive Impairment and Prognostic Parameters in Patients with Congestive Heart Failure

BACKGROUND

Cognitive impairment has been observed in patients with congestive heart failure (CHF). We analyzed in-hospital CHF patients with neuropsychological tests attempting to correlate the results with prognostic parameters.

METHODS

All subjects underwent a mini-mental state examination (MMSE), memory and learning tests (Corsi Block-tapping test, Verbal Span test, Prose Memory test, Visual Search), anxiety and depression scale test. New York Hospital Association (NYHA) class, brain natriuretic peptide (BNP) and left ventricular ejection fraction (LVEF) were evaluated.

RESULTS

Sixty patients (mean age 65.5 years) were analyzed. NYHA class was 2.9 +/- 0.9, LVEF was 32.9 +/- 13.7%, BNP plasma level 683.3 +/- 864.3 pg/mL. In 23.3% of cases a pathological MMSE score emerged; memory and learning test results were abnormal in 3.4-37%. A positive correlation between MMSE and age (r = 0.18, p = 0.01), BNP (r = 0.25, p = 0.02) was observed but not between MMSE and years of education, NYHA class and LVEF. The Corsi Block-tapping test was related to educational duration (r = 0.12, p = 0.02) with a positive trend for BNP (r = 0.2, p = 0.07). The Prose Memory test and Visual Search were influenced by the patients' educational level (r = 0.36, p = 0.0001; r = 0.27, p = 0.0001).

CONCLUSIONS

CHF patients manifest an impairment of MMSE and memory and learning test performance. In our population MMSE correlates to plasma BNP and advanced age.

A conceptual model of cognitive deficits in chronic heart failure

PURPOSE

To describe a conceptual model to guide studies of cognitive deficits among patients with heart failure.

ORGANIZING FRAMEWORK

The conceptual framework of cognitive deficits in chronic heart failure is based on theoretical and empirical literature about (a) the pathophysiology of heart failure, (b) the pathophysiology of cognitive deficits, and (c) health-related quality of life. Other variables that may cause or contribute to cognitive deficits include age, the relative contributions of multiple comorbid conditions, hypertension, and depressive symptoms. Covariates that might influence cognitive deficits (medications, gender, and education) are also included in the model. The most prominent cognitive deficits are believed to occur in domains of attention, working memory, memory, learning, executive function, and psychomotor speed. The main outcome variable is health-related quality of life, which is believed to be influenced by circulatory insufficiency and cognitive deficits.

CONCLUSIONS

The conceptual model described in this paper is a framework for testing cognitive deficits that occur in heart failure. After validation through empirical testing, the model may be useful in developing interventions for patients with heart failure whose care is complicated by cognitive deficits.

Psychological assessment and care of organ transplant patients

Organ transplant has been developed in animal models over the past 100 years. The major limiting factor in transplant medicine is the shortage of donor organs. This shortage creates pressure for fair and efficient allocation of organs, with expectations that those involved in transplantation will strive to achieve optimal outcomes and ensure just access. This article reviews the major types of transplants and the illnesses and behavioral comorbidities that lead to these procedures, the psychological assessment of transplant candidates, the adaptive tasks required of the transplant recipient at various stages of the transplant process, and relevant psychological interventions. Liaison with others on the transplant team and ethical issues of concern to psychologists who work with transplant patients, including living organ donors, are also discussed. Finally, new developments in transplant and suggestions for future psychological research in organ transplant are presented.

The Trail Making Test: a study in focal lesion patients

The relationship of the Trail Making Test (TMT) to the frontal lobes was tested by comparing patients with damage to the frontal and nonfrontal regions to control participants. Although the analysis of time measurements, both raw and transformed, showed notable slowing of frontal groups, error analysis proved to be a more useful method of categorizing performance. Analysis of errors on Part B indicated that all patients who made more than 1 error had frontal lesions. Dividing the frontal damaged patients into subgroups on the basis of the number of errors yielded specificity of brain-behavior relations within the frontal lobes. Patients with damage in dorsolateral frontal areas were most impaired. Those with inferior medial damage to the frontal lobes were not significantly affected in TMT Part B performance.

The relationship between cardiac function and neuropsychological status among heart transplant candidates

BACKGROUND

Cognitive deficits among heart transplant candidates have been well documented. This study was designed to examine the hypothesis that impaired cognitive test performance among heart transplant candidates may be attributed, in part, to decreased cerebral perfusion secondary to poor cardiac function.

METHODS AND RESULTS

Sixty-two patients participated in the study who underwent heart catheterization within 1 day of completing a battery of cognitive tests. Multiple demographic and patient characteristics were examined for their potential moderating role in the relationship between measures of cardiac function and cognitive performance including age, education, race, gender, psychiatric history, medication usage, cardiac surgical history, and self-reported symptoms of depression and anxiety. Only age and education were significantly related to cognitive performance (P < .01). Thus, partial correlation analyses controlling for age and education were used to examine the relationship between cardiac function and cognitive performance. In general, increasing hemodynamic pressure variables (ie, pulmonary artery pressure and right atrial pressure), and to a lesser extent cardiac output and cardiac index, were related (r = - .32 to - .43; P < .01) to decreased performance on cognitive tasks that assessed simple attention, speed of mental processing, and mental flexibility (Digit Span-Forward, Trail Making Test-Part B, Symbol Digits Modalities Test, and Stroop Neuropsychological Screening Test). Left ventricular ejection fraction, systemic and pulmonary vascular resistance, and mean arterial pressure were largely unrelated to cognitive performance in this sample of patients with end stage cardiac disease.

CONCLUSIONS

Hemodynamic pressure variables seem to be most consistently related (ie, inversely) to cognitive functioning among heart transplant candidates.

A selective and critical review of neuropsychological deficits and the frontal lobes

Presumptions about the functions of the frontal lobes, and the sensitivity and specificity of certain tests to measure frontal lobe functions, are having a substantial influence on both clinical and research conclusions. In this paper the authors examine the details of the studies that have contributed to these presumptions, and find that the evidence to support these conclusions is weak. A detailed evaluation of the evidence relating to the Wisconsin Card Sorting Test and the Thurstone Word Fluency Test is also presented. Finally, the development of the belief that frontal lobe functions can be specifically measured is reviewed. The authors of this paper conclude that the "bewildering array" of deficits attributed to frontal lesions still seems to prevail.