A New Method for Image Protection Using Periodic Haar Piecewise-Linear Transform and Watermarking Technique.

The paper presents a novel data-embedding method based on the Periodic Haar Piecewise-Linear (PHL) transform. The theoretical background behind the PHL transform concept is introduced. The proposed watermarking method assumes embedding hidden information in the PHL transform domain using the luminance channel of the original image. The watermark is embedded by modifying the coefficients with relatively low values. The proposed method was verified based on the measurement of the visual quality of an image with a watermark with respect to the length of the embedded information. In addition, the bit error rate (BER) is also considered for different sizes of a watermark. Furthermore, a method for the detection of image manipulation is presented. The elaborated technique seems to be suitable for applications in digital signal and image processing where high imperceptibility and low BER are required, and information security is of high importance. In particular, this method can be applied in systems where the sensitive data is transmitted or stored and needs to be protected appropriately (e.g., in medical image processing).

Analysis of New Orthogonal Transforms for Digital Watermarking.

The paper focuses on the application of new orthogonal transforms in digital watermarking. Novel types of transforms and their characteristics are presented. Potential methods for watermark embedding and recovery are also proposed. They assume embedding hidden information in the transform domains using the luminance channel of the original image. Image spectra are obtained by dividing the original image into smaller blocks that then are further processed by performing the forward transform operation. A watermark is embedded by modifying the spectral coefficients with relatively low values. Since there are various types of transforms, the latter process is realized in an adaptive manner. The proposed solutions were evaluated by measuring the level of visual distortion with respect to the total size of the inserted data. Additionally, the bit error rate (BER) in the recovery phase is also analyzed. The elaborated methods seem to be useful for applications in digital signal and image processing where high imperceptibility and low BER are of great importance. New orthogonal transforms were proved to be useful in watermarking tasks, and in some cases, they can even outperform the classic DCT approach.

Changes over time in the prevention of recurrent coronary artery disease in everyday practice.

INTRODUCTION: Patients with coronary artery disease (CAD) are at high risk of recurrent cardiovascular events, and risk factor control is crucial in this population. OBJECTIVES: The aim of the study was to compare the implementation of the European Society of Cardiology guidelines regarding prevention of recurrent CAD in 2011 to 2013 with 2016 to 2017. PATIENTS AND METHODS: The study included 5 hospitals with cardiology departments serving the city of Kraków and its surrounding districts. Consecutive patients with established CAD were interviewed 6 to 18 months after hospitalization in the years 2011 to 2013 and 2016 to 2017. RESULTS: We examined 616 patients in 2011 to 2013 and 388 in 2016 to 2017 (mean [SD] age, 64.7 [8.8] years vs 66.4 [8.4] years; P <0.01). After adjusting for covariates, the proportion of patients with high blood pressure decreased by 8.9% (95% CI, -15.6% to -2.1%) and the proportion of patients with high level of low­ density lipoprotein cholesterol declined by 9.5% (95% CI, -16.7% to -2.2%) in 2016 to 2017 compared with 2011 to 2013, whereas the proportion of smoking patients (-0.2% [95% CI, -6% to 5.5%]) and those with high glucose levels (3.9% [95% CI, -2.2% to 10%]) and a body mass index of 25 kg/m2 or greater (3.8% [95% CI, -3.9% to 11.6%]) did not change. More patients were prescribed antiplatelets, ß­ blockers, angiotensin converting enzyme inhibitors or angiotensin II receptor blockers, calcium antagonists, and anticoagulants in the second period. CONCLUSIONS: We observed an increase in the proportion of patients with CAD who were prescribed cardiovascular drugs, and consequently a slight improvement in the control of their blood pressure and low­ density lipoprotein cholesterol. No changes were found regarding other main risk factors.

Temporal changes in the secondary prevention of coronary artery disease in patients following myocardial revascularization.

INTRODUCTION: Well-organized, effective secondary prevention of coronary artery disease (CAD) has a potential to improve the patients' prognosis following myocardial revascularization procedures. AIM: To evaluate overtime changes in the implementation of the ESC guidelines for secondary prevention by assessing control of the main risk factors and the rate of cardioprotective drug use in patients following myocardial revascularization procedures. MATERIAL AND METHODS: Patients aged < 81 years who had been hospitalized for a myocardial revascularization procedure in five hospitals serving Krakow and surrounding districts were recruited and interviewed 6-18 months following discharge. Their personal medical history, medication use and control of the main cardiovascular risk factors were evaluated using a standard questionnaire in 2006-2007, 2011-2013, and 2016-2017. The same five hospitals took part in surveys on each occasion. RESULTS: We examined 260 patients in 2006-2007, 200 in 2011-2013 and 190 in 2016-2017. We noted a significant difference in the management of surveys participants: 62% underwent percutaneous coronary intervention (PCI) and 38% coronary artery coronary artery bypass grafting (CABG) in 2006-2007 whereas the corresponding proportions in 2016-2017 were 90% and 10%. The proportion of patients who did not achieve target blood pressure (according to ESC guidelines valid at the time of each survey) in 2006-2007, 2011-2013 and 2016-2017 was 53.5%, 52.3%, and 38.9%, respectively, the proportion of those who did not achieve the LDL cholesterol target (according to ESC guidelines valid at the time of each survey) was 36.3%, 64.0%, and 61.7%, respectively, and the proportion of those with high fasting glucose was 12.6%, 14.6%, and 19.7%, respectively. The proportion of smokers was 16.2%, 19.5%, and 16.8%, whereas 30.5%, 28.6% and 40.5% of patients were obese in 2006-2007, 2011-2013 and 2016-2017, respectively. The proportion of patients taking antiplatelets (91.8% vs. 92.0% vs. 96.3%), ß-blockers (90.3% vs. 87.5% vs. 92.6%), and lipid-lowering drugs (88.7% vs. 91.0% vs. 93.7%) did not change significantly.Conclusions: The analysis of three multicenter surveys provides evidence of the considerable potential for a further reduction in cardiovascular risk in patients following elective myocardial revascularization in Poland.

Practice setting and secondary prevention of coronary artery disease.

INTRODUCTION: Patients with established coronary artery disease (CAD) are at high risk of recurrent cardiovascular events. The aim of the analysis was to compare time trends in the extent to which cardiovascular prevention guidelines have been implemented by primary care physicians and specialists. MATERIAL AND METHODS: Five hospitals with cardiology departments serving the city and surrounding districts in the southern part of Poland participated in the study. Consecutive patients hospitalized due to an acute coronary syndrome or for a myocardial revascularization procedure were recruited and interviewed 6-18 months after hospitalization. The surveys were carried out in 1997-1998, 1999-2000, 2006-2007 and 2011-2013. RESULTS: The proportion of smokers increased from 16.0% in 1997-1998 to 16.4% in 2011-2013 among those who declared that a cardiologist in a hospital outpatient clinic decided about the treatment, from 17.5% to 34.0% (p < 0.01) among those treated by a primary care physician, and from 7.0% to 19.7% (p = 0.06) among patients treated in private cardiology practices. The corresponding proportions were 44.6% and 42.4% (p < 0.01), 47.7% and 52.8% (p = 0.53), 44.2% and 42.2% (p = 0.75) for high blood pressure, and 42.5% and 71.2% (p < 0.001), 51.4% and 79.6% (p < 0.001), 52.4% and 72.4% (p < 0.01) for LDL cholesterol level not at recommended goal. The proportion of patients prescribed cardioprotective medications increased in every analyzed group. CONCLUSIONS: The control of cardiovascular risk in CAD patients has only slightly improved since 1997/98 in all health care settings. The greatest potential for further improvement was found among patients whose post-hospital care is provided by primary care physicians. It is associated with promotion of a no-smoking policy and enhanced prescription of guideline-recommended drugs.

Factors related to the effectiveness of hypercholesterolemia treatment following hospitalization for coronary artery disease.

INTRODUCTION    Patients with established coronary artery disease (CAD) are at high risk of recurrent cardiovascular events. OBJECTIVES    The aim of the study was to identify factors related to control of hypercholesterolemia in patients after hospitalization for CAD. PATIENTS AND METHODS    The study included consecutive patients from 5 hospitals with cardiology departments serving one city in southern Poland. Patients were hospitalized for an acute coronary syndrome or for a myocardial revascularization procedure. Interviews and examinations were conducted 6 to 18 months after hospitalization. RESULTS    Overall, 83.6% of the patients were taking statins; 2.1%, fibrates; and 0.5%, ezetimibe. A statin at a high dose (≥40 mg of atorvastatin or ≥20 mg of rosuvastatin) was taken by 36.1% of the participants. Younger age and index hospitalization in a teaching hospital were significantly associated with a higher probability of taking a statin. Overall, 28.1% of the patients had good control of hypercholesterolemia (low-density lipoprotein [LDL] cholesterol levels <1.8 mmol/l), whereas 71.9%, 38.6%, 24.4%, and 10.3% had LDL cholesterol levels of 1.8 mmol/l or higher, 2.5 mmol/l or higher, 3.0 mmol/l or higher, and 4.0 mmol/l or higher, respectively. Younger age, high blood pressure, and high fasting glucose levels were related to a higher probability of having LDL cholesterol levels of 1.8 mmol/l or higher, while younger age, shorter period of education, professional inactivity, lack of cardiac rehabilitation, and high blood pressure were related to the probability of LDL cholesterol levels of 4.0 mmol/l or higher. CONCLUSIONS    The frequency of statin use is affected by age and health care-related factors, while control of hypercholesterolemia after hospitalization due to CAD is dependent mainly on patient-related and clinical factors.

Cardiac Rehabilitation in Real Life.

Participation in cardiac rehabilitation programs (CRPs) improves prognosis in patients with coronary artery disease (CAD). However, not much is known about the effectiveness of CRP in real life. The aim of this analysis was to identify factors related to the referral to CRP following hospitalization for CAD and estimate the effectiveness of the programs in real life.Medical records of 1061 consecutive patients aged ≤80 years, hospitalized due to an acute coronary syndrome or for a myocardial revascularization procedure in 5 hospitals serving the city and surrounding counties, were reviewed and 611 patients were interviewed 6-18 months posthospitalization.Of 611 patients participating in the interview, 212 (34.7%) were referred following the hospitalization to a center providing CRP. Age, hospitalization in a teaching hospital, and index diagnosis were independently related to being granted a referral. Among the referred patients, 86.3% participated in the CRP. Participation in CRP was related to the lower probability of having high total cholesterol (23% vs 32%, P < 0.05), fasting glucose (11% vs 18%, P = 0.05), HbA1c (8% vs 16%, P = 0.05), and body mass index (27% vs 37%, P < 0.05). Generally, the effect of the CRP was significant in participants with a higher education, but not in those with a low education level. Other factors were not significantly related to the effectiveness of CRP.This study shows that CRPs are effective, but underused in Poland. The participant's education level may influence the effectiveness of CRP. Therefore, in order to increase the impact of CRP, the content of such programs should vary depending on the education level of the participants.

Secondary prevention of coronary artery disease in contemporary clinical practice.

BACKGROUND: The highest priority in preventive cardiology was given to patients with established coronary artery disease (CAD). The aim of the study was to assess the implementation of guidelines for secondary prevention in everyday clinical practice by evaluating control of the main risk factors and the cardioprotective medication prescription rates for patients, following their hospitalization for CAD. METHODS: Five hospitals with cardiology departments serving the city and its surround-ing districts in southern part of Poland participated in the study. Consecutive patients aged ≤ 80 years, hospitalized from January 1 2010 to April 31 2012 due to an acute coronary syndrome or for a myocardial revascularization procedure were recruited and interviewed 6-18 months after hospitalization. RESULTS: The medical records of 595 patients (mean age: 62.8 ± 9.0 years, 397 men and 198 women) were reviewed and included in the analyses. Proportions of medical records with available information on risk factors were high with the exception of total cholesterol levels as well as weight and height measurements, which were available in less than 80% of the hospital records. The prescription rate at discharge for antiplatelets was 99%, beta-blockers (BB)--85%, angiotensin converting enzyme inhibitors (ACEI) or sartans--85%, and lipid-lowering drugs--94%. Patients scheduled for coronary artery bypass grafting were significantly less often prescribed BB, ACEI or sartans, and lipid-lowering drugs. The proportion of patients with high blood pressure (≥ 140/90 mm Hg) 6-18 months after hospitalization was 47%, with high LDL cholesterol level (≥ 1.8 mmol/L) 73%, and with a high HbA1c level (≥ 7.0%) 14%, whereas 20% of participants were smokers and 80% were overweight. The proportion of patients taking an antiplatelet agent 6-18 months after hospitalization was 90%, BB--82%, ACEI--or sartan 78%, and lipid-lowering drug--82%. Overall, 33.9% of the study participants declared that they had been advised to participate in a rehabilitation/secondary prevention program following their hospitalization and 30.5% participated in a rehabilitation/secondary prevention program. However, only 28.2% took part in at least half of the planned sessions. Using a multivariate analysis we showed that, in general, risk factors control and the prescription rates of cardioprotective medications were related to the patients' age, education, and participation in a rehabilitation/secondary prevention program following their hospitalization due to CAD. CONCLUSIONS: Our data provide evidence that there is a considerable potential for further reduction of cardiovascular risk in CAD patients. Our results suggest that increasing patient participation rates in rehabilitation/secondary prevention programs may improve the implementation of the secondary prevention.

[Patients with implanted pacemakers in the primary hospital and stay under the care of an outpatient cardiology clinic--differences in comparison with the reference center]. / Chory z rozrusznikiem serca wszczepionym w szpitalu rejonowym i pozostajacy pod opieka ambulatoryjna rejonowej poradni kardiologicznej--róznice w porównaniu z osrodkiem referencyjnym.

UNLABELLED: The aim of the study was to find an answer for a question whether a newly created primary centre ensures the same level of safety as a reference centre in terms of complications of pacemaker implantation and whether the outpatient care of patients with an implanted pacemaker is as competent as in a reference centre. MATERIAL AND METHODS. The analysis of documentation of the patients (274 pts, 135 men, mean age = 74 + 9 years) who underwent implantation of a permanent single (VVI, 222pts) or dual-chamber (DDD, 52pts) pacemaker at the department of cardiology of the primary centre compared to the reference centre (80 pts) at the department of cardiology. The following data was analyzed: gender, age, length of hospitalization, type of pacemaker, type of electrode, place of pacing, indications for permanent pacing, co-existing diseases, periprocedural complications, complications, technique of electrode implantation and the type of electrode fixation. RESULTS: Patients who underwent implantation of a pacemaker in the primary centre were hospitalized longer than those treated in the reference centre, p < 0.001. The technique of subclavian venipuncture used to implant the passive endocardial electrode was more common in the primary centre, p = 0.034. The number of complications after implantation of pacemaker was not significantly statistically. The technique of electrode implantation has a statistically significant effect on the number of complications (OR = 0.11, p < 0.04). Subclavian venipuncture was associated with a statistically significantly higher incidence of pneumothorax (p < 0.019). The type of pacemaker, electrodes or indication for implantation did not have a statistically significant influence on the complications. The patients with ischemic heart disease and myocardial infarction are the most exposed to the complications (OR = 3.73, p < 0.03). All check-ups at the primary centre were carried out by a physician who used suitable programmers. Most visits in the reference centre were carried out by a technician who used the "IMPULS-BIS" set. Pacemaker implantation costs were directly connected with the duration of hospitalization. CONCLUSIONS. High percentage of ventricular stimulation, stimulation of the apex of the right ventricle, the application of passive electrode, avoiding the use of cephalic vein indicates further the need deepen cooperation between centers. Outpatient care of patients with an implanted pacemaker in the primary centre was as competent as in the reference centre. Pacemaker implantation costs are directly connected with the duration of hospitalisation.

Secondary prevention in patients after hospitalisation due to coronary artery disease: what has changed since 2006?

BACKGROUND: The evidence concerning the quality of secondary prevention of coronary artery disease (CAD) in Poland in recent years is scarce. AIM: To compare the implementation of secondary prevention guidelines into everyday clinical practice between 2006-2007 and 2011-2012 in patients after hospitalisation due to CAD. METHODS: Five hospitals with departments of cardiology serving a city and its surrounding districts in the southern part of Poland participated in the study. Consecutive patients aged ≤ 80 years, hospitalised from April 1, 2005 to July 31, 2006 (first survey) and from April 1, 2010 to June 30, 2011 (second survey) due to acute coronary syndrome or for a myocardial revascularisation procedure were recruited and interviewed 6-18 months after hospitalisation. RESULTS: Medical records of 640 patients were reviewed and included in the first survey and 466 in the second survey. The proportion of medical records with available information on smoking did not differ between the surveys, whereas the proportion of medical records with available information on blood pressure and total cholesterol was lower in patients hospitalised in 2010-2011. The prescription rate of ß-blockers at discharge decreased from 90% to 84% (p < 0.05), whereas the prescription rates at discharge of other drug classes did not change significantly. The proportion of patients with high blood pressure (≥ 140/90 mm Hg) one year after hospitalisation decreased in 2011-2012 compared to 2006-2007 (from 48% to 35%, p < 0.05), whereas the proportion of subjects with high LDL cholesterol, high fasting glucose, and obesity did not change significantly. We did not note a significant difference in the smoking rate. The proportions of patients taking an antiplatelet agent (90% vs. 91%), a ß-blocker (87% vs. 79%), an ACE inhibitor or a sartan (79% vs. 76%), a calcium antagonist (22% vs. 25%), a diuretic (35%vs. 45%), and a lipid-lowering drug (86% vs. 87%) one year after discharge did not change significantly (all p > 0.05). CONCLUSIONS: We noted a modest improvement in the implementation of CAD secondary prevention guidelines in everyday clinical practice: blood pressure was better controlled, although the control of all other main risk factors did not change significantly. Our data provides evidence that there is a considerable potential for further reduction of cardiovascular risk in CAD patients.

Age, sex, and secondary prevention of ischaemic heart disease in everyday practice.

BACKGROUND: Many researchers have studied age- and sex-related differences in the management of patients with coronary artery disease. However, the results are inconsistent. AIM: To assess sex- and age-related bias in the secondary prevention in patients hospitalised due to ischaemic heart disease. METHODS: Five hospitals with departments of cardiology serving a city and surrounding districts in southern Poland participated in the study. Consecutive patients hospitalised from 1 April 2005 to 31 July 2006 due to acute coronary syndrome or for a myocardial revascularisation procedure and aged ≤ 80 years were recruited and interviewed 6-18 months after hospitalisation. RESULTS: The hospital records of 640 patients were reviewed and 513 (80.2%) patients participated in the follow-up interview. Women were older and less educated than their male counterparts. Sex was not independently associated with the control of major risk factors in the post-discharge period, whereas age was related to a higher probability of having high blood pressure and a lower chance of smoking. Multivariate analysis showed that females were prescribed calcium antagonists (odds ratio [OR] 2.13; 95% confidence intervals [CI] 1.34-3.39) and diuretics (OR 1.52; 95% CI 1.00-2.31) more often than males. Age was independently related to the prescription rate of diuretics (≥ 70 years vs. < 60 years; OR 1.61; 95% CI 1.19-2.20). The prescription rate of antiplatelets, beta-blockers, angiotensin converting enzyme-inhibitors/sartans, lipid-lowering drugs, and anticoagulants was not related to age or sex. CONCLUSIONS: We found no major sex-related difference in the frequency of achieving recommended goals in secondary prevention, whereas age was related to a lower prevalence of smoking and a higher probability of having high blood pressure in subjects after hospitalisation for coronary artery disease.