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Original Article
Clinical Study Subclinical Atherosclerosis in Patients with Cushing Syndrome: Evaluation with Carotid Intima-Media Thickness and Ankle-Brachial Index
Luigi Petramala1, D'Elia Lorenzo1, Gino Iannucci1, Antonio Concistré1, Laura Zinnamosca1, Cristiano Marinelli1, Giuseppe De Vincentis2, Antonio Ciardi3, Giorgio De Toma3, Claudio Letizia1
Endocrinology and Metabolism 2015;30(4):488-493.
DOI: https://doi.org/10.3803/EnM.2015.30.4.488
Published online: December 31, 2015

1Department of Internal Medicine and Medical Specialties, University of Rome "Sapienza", Rome, Italy.

2Section Nuclear Medicine, Department of Radiology, University of Rome "Sapienza", Rome, Italy.

3Department of Surgery, "P. Valdoni", University of Rome "Sapienza", Rome, Italy.

Corresponding author: Claudio Letizia. Department of Internal Medicine and Medical Specialties, University of Rome "Sapienza", Policlinico Umberto I, Viale del Policlinico 155, Rome 00165, Italy. Tel: +39-6-49970944, Fax: +39-6-49970944, claudio.letizia@uniroma1.it
• Received: February 20, 2015   • Revised: March 27, 2015   • Accepted: June 18, 2015

Copyright © 2015 Korean Endocrine Society

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Background
    Cushing syndrome (CS) has been described as a killing disease due its cardiovascular complications. In fact, chronic cortisol excess leads to a constellation of complications, including hypertension, hyperglycemia, adiposity, and thromboembolism. The main vascular alteration associated with CS is atherosclerosis.
  • Methods
    Aim of this study was to analyze carotid intima-media thickness (cIMT) and ankle-brachial index (ABI), two surrogate markers of subclinical atherosclerosis in a consecutive series of CS patients, compared to patients with essential hypertension (EH) and health subjects (HS).
  • Results
    Patients with CS showed a significant increase (P<0.05) of cIMT (0.89±0.17 mm) compared to EH (0.81±0.16 mm) and HS (0.75±0.4 mm), with a high prevalence of plaque (23%; P<0.03). Moreover, CS patients showed a mean ABI values (1.07±0.02) significantly lower respect to HS (1.12±0.11; P<0.05), and a higher percentage (20%) of pathological values of ABI (≤0.9; P<0.03).
  • Conclusion
    In conclusion, we confirmed and extended the data of cIMT in CS, and showed that the ABI represent another surrogate marker of subclinical atherosclerosis in this disease.
  • Keywords: Cushing syndrome; Subclinical atherosclerosis; Carotid intima-media thickness; Ankle brachial index
Cushing syndrome (CS) represents the patter of symptoms and signs caused by prolonged exposure of cortisol excess [123]. CS is relatively rare, most common in adults between the ages of 20 and 50, affecting approximately 2 to 3 million people in each year [1]. The CS is secondary to an adrenocorticotrophin (ACTH)-secreting pituitary tumor (ACTH-dependent CS) in around 70%, a cortisol-secreting adrenal lesion (ACTH-independent CS) in 15% to 20%, and an ACTH-secreting extrapituitary tumor (ectopic CS) in 10% to 15% of the cases [456].
Excess cortisol levels determine adverse clinical features including central adiposity, pigmented striae, muscle weakness, and mood disturbance. CS is associated with hypertension, impaired glucose tolerance and diabetes, and an increase of cardiovascular disease [6]. The estimated standardized all-cause mortality ratio in patients with active CS is 2 to 4 times higher than the general population [7]. In particular, cardiovascular complications associated with CS include coronary artery disease, stroke and congestive heart failure, which significantly increase the mortality rate [358]. In particular, the main vascular alteration associated with CS is arterial atherosclerosis [9].
Increased carotid intima-media thickness (cIMT) has been proposed as signal of subclinical atherosclerosis [10]. Moreover, ankle-brachial index (ABI) has been reported another surrogate marker of carotid or coronary atherosclerosis and predictor of features ischemic events [11].
The aim of this study was to analyze cIMT and ABI, two surrogate markers of atherosclerosis, in a consecutive series of CS patients and compare them with essential hypertension (EH) patients and health subjects (HS).
The study was carried out under clinical conditions, and we enrolled 30 consecutive patients with CS: 20 women and 10 men of mean age 54.9±11.8 (SD). Twelve patients had ACTH-dependent CS and 18 had ACTH- independent CS. The CS diagnosis was based on the clinical signs and symptoms (central redistribution of fat, hypertension, osteoporosis, muscle weakness), hormonal data and imaging tests (pituitary magnetic resonance imaging, adrenal computed tomography, adrenal scintiscan). Endocrine tests for CS showed lack diurnal rhythm of serum cortisol levels (>5 µg/dL at midnight), no suppression of serum cortisol (>1.8 µg/dL) levels after a low-dose (1 mg) dexamethasone suppression test, and increased 24-hour urinary free cortisol excretion. Measurement of plasma ACTH differentiated ACTH dependent CS (ACTH ≥10 pg/mL) from ACTH-independent CS (<10 pg/mL). In these patients, possible coexistence of hyperaldosteronism was excluded from the study population by screening test using aldosterone (ng/dL) to renin (ng/mL/hr) ratio less than 30.
Thirty-five age-matched EH patients (49.2±11.3 years) and 30 HS (46.3±19.3 years) served as controls (Table 1). The diagnosis of EH was made by exclusion of the common forms of secondary hypertension (primary aldosteronism, pheochromocytoma, renoparenchymal disease, and renovascular stenosis).
Exclusion criteria for CS patients and controls included: cardiovascular disease defined as history of previous stroke or established cardiovascular disease or symptomatic peripheral or carotid artery disease, impaired kidney formation (glomerular filtration rate ≤60 mL/min/1.73 m2) and chronic inflammation.
Arterial hypertension was defined as systolic blood pressure (SBP) >140 mm Hg and/or diastolic blood pressure >90 mm Hg, often 3 averaged blood pressure (BP) measurements or as receiving antihypertensive treatment. All subject underwent 24-hour ambulatory blood pressure monitoring.
Informed consent was obtained from all subjects and the study was performed in accordance with the Declaration of Helsinki.
Measurement of carotid intima-media thickness
A Hewlett-Packard Sonor 5500 Ultrasound system (Hewlett-Packard, Andover, MA, USA), equipped with a 3.11 MHz real-time B-mode scanner was used for the evaluation. Imaging of the right common carotid artery (CCA) was performed with the subjects turning their head 45° to the left. The high-resolution images were analyzed to calculate cIMT, defined of thickness of the vascular intima-media complex obtained in five consecutive regions of the wall of the CCA, every 4 to 5 mm beginning close to the bifurcation. The value attributed to each subject was the average value among the cIMT measurement, five from the left and five from the right carotid artery. Intra- and interobserved variabilities for cIMT were 4.6±0.4 and 5.2±0.3, respectively.
Mean common carotid diameter was defined as the line identifying the media-adventitia interface in the near to the far wall calculated automatically by averaging measurements at 0.1 intervals of 1 cm.
Ankle-brachial index
For all subjects we measured ABI after a 5 minutes rest in the supine position. The ABI was determined using automated oscillometric measurement BOSO-ABI system neo (Bosch+Sohn GmbH U. Co. KG, Jungingen, Germany), that allows simultaneous arm-leg BP measurements. This validated device can determine ABI accurately and significantly faster than with the traditional method. Moreover, it is much less influenced by the observed. All the measurements were performed in each subject included in the study by only personal specifically trained for this purpose.
Statistical analysis
Statistical analysis was performed by using SigmaStat program (Jandel Corp., Las Vegas, NV, USA). Data were expressed as mean±standard deviation for numeric data and frequency (percentage) for categorical data. Differences between data were evaluated by Student t test for paired data or Wilcoxon test for impaired data. P<0.05 was considered statistically significant.
Table 1 shows the anthropometric and laboratory data of all subjects enrolled in the study. CS patients showed highest body mass index (28.6±6 kg/m2) and waist circumference (100±15.3 cm) compared to EH patients (26.8±4.5 kg/m2 and 92.5±13.3 cm, respectively; P<0.01) and HS (25.6±2.3 kg/m2 and 87.6±11 cm, respectively; P<0.01).
No statistically significant differences (P>0.05) of clinical BP values were found in all hypertensive groups (CS and EH), whereas significantly higher were in these groups compared to HS (P<0.01). Moreover, Table 1 shows the biochemical parameters revealed in all groups. In particular, patients with CS showed higher fasting blood glucose (109.2±25 mg/dL) respect to EH patients (88.1±6.9 mg/dL) and HS (83±12.7 mg/dL; P<0.05, respectively). Finally, CS and EH patients showed increased levels of albuminuria (60.1±18.3 and 49.9±11.5 mg/day, respectively) compared to HS (15.3±17.2 mg/day; P<0.01, respectively).
Echocolor-Doppler imaging of CCA showed a significant increase (P<0.05) of cIMT in patients with CS (0.89±0.17 mm) compared to EH patients (0.81±0.16 mm) and HS (0.75±0.24 mm). Moreover, we found a higher prevalence of plaque in CS patients (26.6%) compared to in EH patients (16%). None plaque was revealed in HS (Table 2).
Mean ABI measured by automatic method in CS and EH patients were 1.07±0.02 and 1.1±0.08 respectively. A significant difference (P<0.05) was found for ABI between CS patients (0.97±0.12) and HS (1.12±0.11). In particular in CS patients we found a higher percentage (20%) of pathological value for ABI (<0.9) compared to EH and HS (P<0.03) (Table 2).
CS, a clinical condition that refers to the manifestation induced by chronic cortisol excess is associated with increased cardiovascular morbidity, and vascular events are one of the major causes of death in untreated patients [3578]. The main vascular alteration associated with CS is arterial atherosclerosis [9].
Carotid ultrasound which is assured both cIMT and carotid plaque is useful in detecting the degree of subclinical atherosclerosis. In fact, cIMT and carotid plaque is considered a surrogate marker of subclinical atherosclerosis and it is able to predict both coronary and cerebrovascular events [10].
The results of the present study show that cIMT was increased in patients with CS compared to EH patients and HS. The increase of cIMT in CS confirmed and reinforced the concept that the glucocorticoids may alter the structure of wall arteries, predisposing at the atherosclerosis. In fact previous studies reported that arterial wall damage in CS patients is more performed than in EH patients, in part, secondary to excessive cortisol production, thereby resulting in thickening the intima-media layer of carotid artery [12]. Moreover, CS patients have higher degree of early atherosclerosis, and the appropriate treatment not only corrects the high BP values and metabolic disorders, but also reverses vascular change in these patients [13].
Several experimental studies have shown that glucocorticoids excess causes direct cardiovascular effects, such as increased renin-angiotensin system, sympathetic nervous system and endothelin system as well as decreased nitric oxide (NO) synthesis and kallikrein-kinin system [13]. Moreover, patients with CS are known to have an irreversible arterial stiffness (decreased vascular compliance), and several humoral markers of endothelial dysfunction (such as endothelin, homocysteine, vascular endothelial factor, adrenomedulin, and cell adhesion molecules) are believed to be responsible for vascular endothelial and smooth muscle proliferation as well as fibrosis around vessels [14151617]. Collectively, it has been suggested that glucocorticoids excess in CS plays an important role in the development of endothelial dysfunction that is consistent ad initial event in the development of atherosclerosis plaques.
Another important factor is the dysregulation of the glucose metabolism that we found in our patients with CS. In fact, observational studies in persons with hyperglycemia have shown that glucose concentrations were associated with cIMT [18192021].
Finally, in our study another important result found is the mean ABI measured by automated method. The ABI, which is the ratio of SBP at the ankle to that in the arm, is used to detect peripheral obstructive arterial disease and cerebrovascular disease, and has attracted considerable clinical and scientific interest [22]. However, the ABI is also an indicator of generalized atherosclerosis and low ABI has been related to an increased incidence of cardiovascular mortality [2324252627]. This increased relative risk has been shown to be independent of baseline cardiovascular and risk factors suggesting that the ABI may have independent role in predicting cardiovascular events.
Initially this method described by Carter [28], was only determined with the use of vascular Doppler. More recently, studies have demonstrated the efficacy of using automatic oscillo-metric sphygmomanometers for determination of this index, because it is simples, low cost, and easy to use [29]. In particular, has been reported that the automated oscillometric measurement of ABI is a reliable and useful alternative to conventional eco-Doppler determination in the general population [30], and some authors [303132] have reported that only one BP measurement is sufficient to perform the ABI determination as no additional advantages have been shown with a second or a third determination.
An abnormal ABI value is defined as ≤0.90 and values >1.40 indicate a no compressible artery [25]. Recently, several investigators have reported that ABI value of 0.91 to 0.99 should be considered borderline and that is associated with an increasing risk of cardiovascular disease [3334]. Moreover, in comparison with subjects with normal ABI, subjects with altered indices are at approximately four times greater risk of developing cardiovascular disease [35]. In our study, the results analysis of the ABI revealed differences among the groups. In particular, arterial wall alterations were found in the CS patients (ABI <0.9 in 20% of subjects), and we hypothesized that the chronic high glucocorticoids levels associated to high blood values and metabolic disorders significantly accelerate the development of atherosclerosis, leading a decrease in ABI.

CONFLICTS OF INTEREST: No potential conflict of interest relevant to this article was reported.

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Table 1

Anthropometric and Laboratory Data in All Groups Study

enm-30-488-i001.jpg
Parameter Cushing syndrome patient Essential hypertension Health subject P value
Number 30 35 30
Age, yr 54.9±11.8 49.2±11.3 46.3±19.3 NS
Sex, male:female 4:26 37:18 32:18 -
Body mass index, kg/m2 28.6±6a 26.8±4.5 25.6±2.3 <0.01
Waist circumference, cm 99±15.3a 92.5±13.3 87.6±1.1 <0.01
Current smoker 5 6 7 NS
Fasting glucose, mg/dL 109.2±45a 88.1±6.9 83±12.7 <0.05
Sodium, mmol/L 144±2a 143±2 141±1 <0.05
Potassium, mmol/L 3.45±0.6a 3.9±0.5 4.2±0.5 <0.05
Creatinine, mg/dL 1.10±0.2 1.25±0.3 1.17±0.2 NS
Cholesterol, mg/dL 219.5±15.3 210.7±9.5 180.5±10.3 NS
HDL-C, mg/dL 55.5±13.7 54.3±12.2 50.5±8.9 NS
LDL-C, mg/dL 112±36.6 138.3±37 117.5±12 NS
Triglycerides, mg/dL 126±55 104.7±41 112.5±37 NS
Albuminuria, mg/day 60.1±18.3a 49.9±11.5a 15.3±17.2 <0.01
Uric acid, mg/dL 5.3±1.7 5.9±2.5 5.03±7 NS

Values are expressed as mean±SD.

NS, not significant; HDL-C, high density lipoprotein cholesterol; LDL-C, low density lipoprotein cholesterol.

aP<0.01 vs. health subject.

Table 2

Blood Pressure, cIMT, and ABI in All Groups Study

enm-30-488-i002.jpg
Variable Cushing syndrome patient Essential hypertensive Health subject
Office-SBP, mm Hg 142.8±23a 140.1±16.8a 126±13.3
Office-DBP, mm Hg 96±12.6a 90.6±16.8a 76.2±7
Office-HR, beats/min 79.6±12 80.6±11 70.7±11
ABPM-SBP-G, mm Hg 131.6±13.2a 132.36±13.4a 121.8±8.95
ABPM-DBP-G, mm Hg 83.76±10.1a 85.05±9.77a 74.14±8.2
ABPM-HR-G, beats/min 75.4±10.1 77.3±9.1 73.4±7.3
cIMT, mm 0.93±0.17b 0.81±0.16 0.75±0.24
Plaque, % 26.6b 16 0
ABI 0.97±0.12c 1.1±0.08 1.12±0.11
ABI (<0.9), % 20b 3 0

Values are expressed as mean±SD.

cIMT, carotid intima-media thickness; ABI, ankle-brachial index; SBP, systolic blood pressure; DBP, diastolic blood pressure; HR, heart rate; ABPM, ambulatory blood pressure monitoring; G, global (24 hours).

aP<0.01 vs. health subject; bP<0.03 vs. essential hypertensive and health subject; cP<0.05 vs. health subject.

Figure & Data

References

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