Altered Cerebral Vasoreactivity on Transcranial Color-Coded Sonography Related to Akinetic-Rigid Phenotype of Parkinson's Disease: Interim Analysis of a Cross-Sectional Study

BACKGROUND

A correlation between worse functional outcomes in Parkinson's disease (PD) patients with cerebrovascular disease (CVD) or the Akinetic-rigid phenotype has been argued in recent studies. We aimed to evaluate the association of cerebral hemodynamics impairments, assessed by Transcranial Color-coded Doppler sonography (TCCS), on PD patients with different phenotypes of the disease and with risk factors for CVD.

METHODOLOGY

Idiopathic PD patients (n = 51) were divided into motor subtypes: Akinetic-rigid (AR) (n = 27) and Tremor-dominant (TD) (n = 24) and into two groups regarding vascular risk factors: when ≥2 were present (PDvasc) (n = 18) and <2 (PDnvasc) (n = 33). In a parallel analysis, the Fazekas scale on brain magnetic resonance imaging (MRI) was applied to a sample to assess the degree of leukoaraiosis. TCCS examinations were prospectively performed obtaining middle cerebral artery Mean Flow Velocities (Vm), Resistance Index (RI), and Pulsatility Index (PI). The Breath-Holding Index (BHI) was calculated to assess cerebrovascular reactivity (cVR). Standardized functional scales were administered (UPDRS III and Hoehn&Yahr).

RESULTS

The phenotype groups were similar in age, disease duration and demographic parameters, but there were significantly higher H&Y scores than TD group. cVR was impaired in 66.7% of AR vs. 37.5% of TD. AR group exhibited lower BHI (0.53 ± 0.31 vs. 0.91 ± 0.62; p = 0.000), lower Vm after apnea (44.3 ± 9.0 cm/s vs. 53.4 ± 11.4 cm/s; p = 0.003), higher PI (0.91 ± 0.26 vs. 0.76 ± 0.12; p = 0.000) and RI (0.58 ± 0.11 vs. 0.52 ± 0.06; p = 0.021). PDvasc group showed higher PI (0.98 vs. 0.76; p = 0.001) and higher frequency of altered cVR (72.2% vs. 42.2%; p = 0.004). There was a significant predominance of higher values on Fazekas scale in the PDvasc group. We found no difference between the Fazekas scale when comparing motor subtypes groups but there was a trend toward higher scores in the AR phenotype.

CONCLUSIONS

TCCS, a cost-effective method, displayed impaired cVR in Parkinsonian patients with risk factors for CVD with higher degree of MRI leukoaraiosis. PD patients with the AR disease phenotype also presented impaired cVR on TCCS and greater functional impairment, although with just a trend to higher scores on MRI Fazekas.

Transcranial sonography depicts a larger substantia nigra echogenic area in renal transplant patients on calcineurin inhibitors than on rapamycin

BACKGROUND

After kidney transplantation neurologic manifestations may develop, including Parkinson's disease (PD). An enlarged substantia nigra (SN) by transcranial sonography has been recognized as a marker of PD.

METHODS

In renal transplant recipients (RTRs = 95) and controls (n = 20), measurement of mesencephalon, SN, third ventricle, spleen and carotid intima-media thickness (cIMT) and middle cerebral artery (MCA), kidney and spleen arteries Doppler resistive index (RI) were performed.

RESULTS

RTRs had larger SN, third ventricle and cIMT and higher renal RI than controls. The SN was larger in the CNIs group than in controls and rapamycin group, while the third ventricle was similar between patients but larger than in controls. In RTRs, SN showed a direct linear correlation with spleen and the third ventricle with age, cIMT and RI of the MCA, kidney and spleen. In CNIs group the SN correlated positively with age and cIMT, while the third ventricle reproduced RTRs correlations. Rapamycin group showed a direct linear relationship between the third ventricle and age and RI of the MCA, kidney and spleen; SN showed no correlations.

CONCLUSION

RTRs on CNIs present a larger SN area than on rapamycin, probably due to the antiproliferative effect of rapamycin. This finding might be relevant when interpreting TCS in RTRs.

Parenchymal imaging in movement disorders

The use of B-mode sonography in neurological diagnosis was once considered of limited importance due to the barrier of the skull. However, modern ultrasound systems allow visualization of the brain parenchyma with a high degree of accuracy. Transcranial sonography (TCS) can offer unique information on brain tissue pathology, as it uses different physical principles for imaging acquisition than do other neuroimaging techniques. The method is harmless, is quick to perform at low cost and demands no sedation. The main limitations of this technique are dependence on the quality of the individual bone window and on proper operator training. A huge body of research has shown that patients with Parkinson's disease (PD) display an enlarged hyperechogenic substantia nigra by TCS with a positive predictive value of 92.9%. Healthy individuals (8-15%) may show the same marker, in some cases correlating with decreased striatal dopamine uptake, motor slowing and prodromal markers of PD, indicating that this ultrasound sign may constitute a risk marker for PD. Other movement disorder diagnoses, although less extensively studied for TCS, may benefit from using this method as a supplementary diagnostic tool. This review provides a summary of the typical TCS findings and their value in the differential diagnosis of some movement disorders.

Transcranial sonography as a diagnostic tool for Parkinson's disease: a pilot study in the city of Rio de Janeiro, Brazil

In Brazil there is no systematic study on Transcranial Sonography (TCS), a neuroimaging method that depicts echogenic deep brain structures using ultrasound. OBJECTIVE: To establish the percentage of subjects with permissive temporal windows and to address the ability of TCS of the substantia nigra (SN) to distinguish parkinsonian patients in a Brazilian sample. METHOD: We performed TCS using the Acuson X300 (Siemens, Germany) in 37 individuals: 23 with Parkinson's disease (PD) and 14 healthy controls. RESULTS: 10.8% of subjects had insufficient temporal acoustic bone windows. SN echogenic areas were larger in patients (mean±SD, 0.31±0.08cm²) compared to controls (mean±SD, 0.17±0.02cm²). TCS accurately identified 88.2% of PD patients. CONCLUSION: A large proportion of Brazilians seem to be eligible for TCS. An expressive number of PD patients could be diagnosed by TCS based on an expanded SN echogenic area. However, the current data is preliminary and must be corroborated by larger studies.

[Cognitive function in menopausal women evaluated with the Mini-Mental State Examination and Word-List Memory Test]

There is little research in Brazil on cognition and menopause, despite the high frequency of neuropsychiatric complaints in this phase of women's life. The authors present a cross-sectional study aimed at describing the scores by 156 menopausal women on the Mini-Mental State Examination (MMSE) and the Word-List Memory Test (WLMT). The mean score on the MMSE was 25.86 points (SD = 2.67), similar to other studies, except for better performance by illiterate women; scores on the sub-items 'attention and calculation' and 'immediate recall' showed lower values. In the WLMT, the mean was also consistent with the literature (M = 18.83 words; SD = 3.82). The only significant associations with score were for schooling in both tests and arterial hypertension in the WLMT. The authors conclude that cognitive performance in these menopausal women is similar to that of other Brazilian samples, corroborating the wider range of scores among individuals with lower schooling. Complaints pertaining to memory in middle-aged women may be related to decreased attention.

Avaliação da sintomatologia depressiva de mulheres no climatério com a escala de rastreamento populacional para depressão CES-D

INTRODUÇÃO: O objetivo deste estudo foi avaliar a sintomatologia depressiva em mulheres climatéricas com a escala de depressão CES-D (Center for Epidemiological Studies Depression Scale), do National Institute of Mental Health (EUA). MÉTODO: Estudo transversal com 151 mulheres entre 40 e 65 anos de idade, usuárias de serviço de ginecologia geral em unidade de atenção básica à saúde no Rio de Janeiro. Aplicou-se a escala CES-D e um questionário estruturado para a obtenção de dados sociodemográficos, clínicos e ginecológicos. O nível de corte > 15 pontos na CES-D foi considerado como indicativo de quadro depressivo. RESULTADOS: A média de pontuação da amostra foi de 9,2 pontos (desvio padrão = 9,0). Os itens mais pontuados da escala foram relativos à insônia, tristeza e desânimo. Não houve associação significativa entre os escores e o período climatérico, características sociodemográficas, clínicas ou ginecológicas, exceto para as mulheres com presença de sintomas psíquicos, histórico depressivo pregresso e uso atual de antidepressivos (p = 0,000). Entre as 32 mulheres (21%) com pontuação > 15 na CES-D, 72% referiram episódio depressivo pregresso. Dentre as participantes sem histórico depressivo, as perimenopáusicas apresentaram escores > 15 com maior freqüência. CONCLUSÃO: Essa casuística, oriunda de serviço não-especializado em menopausa ou saúde mental, revelou baixas pontuações médias na escala de sintomas depressivos CES-D, e o item insônia foi o mais pontuado. O histórico de depressão foi fator de associação com a alta pontuação na escala, mas não a fase climatérica em que a mulher se encontrava. A maior freqüência de pontuação acima do nível de corte nas mulheres sem histórico depressivo pregresso que estavam na perimenopausa sugere a maior vulnerabilidade, nessa fase, a episódios depressivos novos.