search
Back to results

Evaluation of the Effect of Long-term Lipid-lowering Therapy in STEMI Patients With Coronavirus Infection COVID-19 (CONTRAST-3)

Primary Purpose

STEMI, Covid19, NSTEMI

Status
Recruiting
Phase
Not Applicable
Locations
Russian Federation
Study Type
Interventional
Intervention
Atorvastatin 80mg
Atorvastatin-Ezetimibe
Sponsored by
Penza State University
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional treatment trial for STEMI focused on measuring myocardial strain, arterial stiffness, myocardial electrical heterogeneity, quality of life

Eligibility Criteria

30 Years - 70 Years (Adult, Older Adult)All SexesDoes not accept healthy volunteers

Inclusion Criteria:

  1. Signed informed consent
  2. Patients of both genders aged 30 to 70 years
  3. The presence of one of the options for a combination of confirmed myocardial infarction and new coronavirus infection:

3.1. Myocardial infarction that developed within 30 days from the onset of COVID-19 - in case of mild to moderate course or within 60 days - in case of severe course.

3.2. Development of a confirmed case of COVID-19 within 30 days from the myocardial infarction onset.

4.1. Clinical manifestations of acute respiratory infection (body t> 37.5 ° C and one or more signs: cough, dry or moist sputum, shortness of breath, chest tightness, SpO2 ≤ 95%, sore throat, mild or moderate rhinorrhea, impaired or loss of smell (hyposmia or anosmia), loss of taste (dysgeusia), conjunctivitis, weakness, muscle pain, headache, vomiting, diarrhea, skin rash) in the presence of at least one of the epidemiological signs:

  • returning from a foreign trip 14 days before the onset of symptoms;
  • having close contacts in the last 14 days with a person under surveillance for COVID-19 who subsequently fell ill;
  • having close contacts in the last 14 days with a person with a laboratory confirmed diagnosis of COVID-19;
  • having professional contacts with people who have a suspected or confirmed case of COVID-19.

4.2. The presence of clinical manifestations specified in 4.1, in combination with changes in the lungs according to computed tomography data, regardless of the results of a single laboratory study for the presence of SARS-CoV-2 RNA and an epidemiological history, or if it is impossible to conduct a laboratory study for the presence of SARS-RNA CoV-2.

4.3. A positive laboratory test result for the presence of SARS-CoV-2 RNA using nucleic acid amplification methods (NAA) or SARS-CoV-2 antigen using immunochromatographic analysis, regardless of clinical manifestations.

4.4. Positive result for IgA or IgM, or IgM with IgG in patients with clinically confirmed COVID-19 infection.

Primary STEMI or NSTEMI, confirmed by a diagnostically significant increase in cardiospecific enzymes (5.1) in combination with at least one criterion of acute myocardial ischemia (item 5.2):

5.1. An increase and / or decrease of serum cardiac troponin level, which should at least once exceed the 99th percentile of the URL in patients without an initial increase of serum cardiac troponin level, or its increase> 20% with an initially increased level of cardiac troponin, if up to it remained stable (variation < 20%) or declined.

5.2. Typical anginal attack / acute ischemic changes on the ECG / the appearance of pathological Q waves on the ECG / EchoCG confirmation of the presence of new areas of the myocardium with impaired local contractility / detection of intracoronary thrombosis in coronary angiography.

Presence of type 1 myocardial infarction (6.1) or type 2 (6.2), confirmed by coronary angiography:

6.1. Atherothrombosis of an infarct-related artery with a sharp decrease in blood flow distal to the damaged atherosclerotic plaque or distal embolization with thrombotic masses / fragments of atherosclerotic plaque, followed by the development of myocardial necrosis; or intramural hematoma in a damaged atherosclerotic plaque with a rapid increase in its volume and a decrease in the lumen of the artery).

6.2. Myocardial infarction developed as a result of ischemia caused by non-thrombotic complications of coronary atherosclerosis. Pathophysiologically, such myocardial infarctions are associated with an increase in myocardial oxygen demand and / or a decrease in its delivery to the myocardium, for example, due to coronary artery embolism, spontaneous coronary artery dissection, respiratory failure, anemia, cardiac arrhythmias, arterial hypertension or hypotension, etc.

Duration of subsequent hospitalization after inclusion in the study - at least 5 days

Exclusion Criteria:

  1. Hemodynamically significant stenosis of the left coronary artery> 30%.
  2. Recurrent or repeated STEMI or NSTEMI.
  3. Exogenous hypertriglyceridemia (type 1 hyperchylomicronemia - TC / TG <0.15).
  4. Acute heart failure III-IV.
  5. Individual intolerance to statins, ezetimibe, alirocumab.
  6. Congenital and acquired heart defects.
  7. Non-sinus rhythm, artificial pacemaker.
  8. Sinoatrial and atrioventricular block of 2-3 degrees.
  9. QRS complex> 100 ms.
  10. Complete blockade of left or right bundle branch.
  11. History of CHF III-IV class according to NYHA.
  12. The presence of pronounced LV hypertrophy according to echocardiography (IVS / LVS> 14 mm).
  13. Uncontrolled hypertension with SBP> 180 mm Hg. and DBP> 110 mm Hg.
  14. Diabetes mellitus type 1 or type 2 requiring insulin therapy.
  15. Presence of anemia at the time of screening (Hb <100 g / l)
  16. Chronic kidney disease (GFR < 30 ml / min / 1.73 m2 according to the CKD-EPI formula).
  17. Uncorrected thyroid dysfunction in the presence of hyper- / hypothyroidism.
  18. Body mass index (BMI) ≥35 kg / m2.
  19. Pregnancy, lactation.
  20. Alcohol abuse, drug use.
  21. Other severe concomitant diseases that exclude the possibility of participation in the study.
  22. Participation in other clinical trials within the previous 2 months.

Sites / Locations

  • Valentin OleynikovRecruiting

Arms of the Study

Arm 1

Arm 2

Arm Type

Active Comparator

Active Comparator

Arm Label

Atorvastatin 80 mg

Atorvastatin-Ezetimibe

Arm Description

Initially, hypolipidemic treatment with atorvastatin at a dose of 80 mg / day is prescribed from the first 24-96 hours of myocardial infarction in addition to standard therapy for the disease.

In the absence of reaching the target level of LDL-C ≤1.4 mmol / L and ≥50% of the initial level after 4-6 weeks from the onset of myocardial infarction, patients additionally receive ezetimibe at a dose of 10 mg 1 time / day.

Outcomes

Primary Outcome Measures

Lipid profile assessment
Achievement of target level of lipid profile (total cholesterol, LDL-С, HDL-C, triglycerides) during the atorvastatin therapy
Assessment of ventricular rhythm disturbances
The frequency of ventricular arrhythmias recorded with 24 hour ECG monitoring
Electrical instability and autonomic regulation of heart rate
Changes in parameters of electrical instability and autonomic regulation of heart rate recorded with 24 hour ECG monitoring
Left ventricular systolic function
Assessment of LV systolic function differences according to echocardiography during atorvastatin treatment
Left ventricular myocardial deformation (strain, strain rate)
Assessment of LV myocardial deformation (strain, strain rate) differences according to echocardiography during atorvastatin treatment
Number of Participants with major cardiovascular events
Number of Participants with major cardiovascular events: PCI / CABG for a new case of coronary atherosclerosis, hospitalizations for unstable angina pectoris, recurrent AMI

Secondary Outcome Measures

Full Information

First Posted
May 9, 2021
Last Updated
May 10, 2022
Sponsor
Penza State University
search

1. Study Identification

Unique Protocol Identification Number
NCT04900155
Brief Title
Evaluation of the Effect of Long-term Lipid-lowering Therapy in STEMI Patients With Coronavirus Infection COVID-19
Acronym
CONTRAST-3
Official Title
Evaluation of Long-term Lipid-lowering Therapy on Myocardial Electrical Heterogeneity, Myocardial Deformation, Arterial Stiffness and Quality of Life in Patients With Primary STEMI/NSTEMI With Coronavirus Infection COVID-19
Study Type
Interventional

2. Study Status

Record Verification Date
May 2022
Overall Recruitment Status
Recruiting
Study Start Date
November 20, 2020 (Actual)
Primary Completion Date
January 2023 (Anticipated)
Study Completion Date
May 2023 (Anticipated)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Principal Investigator
Name of the Sponsor
Penza State University

4. Oversight

Studies a U.S. FDA-regulated Drug Product
No
Studies a U.S. FDA-regulated Device Product
No
Product Manufactured in and Exported from the U.S.
No

5. Study Description

Brief Summary
It is planned to include 200 patients hospitalized with primary myocardial infarction with and without ST segment elevation (STEMI or NSTEMI) in combination with COVID-19 within the first 15 days from the disease onset. The total follow-up period is 96 weeks. Hypotheses: An integrated approach in assessing myocardial contractility, regulation of the heart and the structural and functional state of arteries will make it possible to more accurately assess the heart pumping function; explain the mechanisms of the relationship between left ventricular (LV) contractile function and its volumetric indices; to study the mechanisms of ventriculo-arterial coupling and the influence of autonomic regulation, the role of markers of the sudden cardiac death (late ventricular potentials, pathological turbulence of the heart rate, dispersion of the QT interval). In patients who have had myocardial infarction in combination with the new coronavirus infection SARS-CoV-2 (COVID-19), long-term highly effective lipid-lowering therapy, regardless of the drugs prescribed, has an antiarrhythmic effect and has a beneficial effect on the autonomic regulation of the heart rate. Highly effective lipid-lowering therapy leads to an improvement in LV contractility and structural and functional properties of the large arteries. Methods and variables Office blood pressure 12-lead ECG Coronary angiography. Percutaneous coronary intervention Chemistry blood test 2D and 3D transthoracic echocardiography (Vivid GE 95 Healthcare (USA) Multi-day 3-lead ECG monitoring with assessment of the parameters of myocardial electrical instability. Ultrasound of common carotid arteries using high-frequency radio-frequency signal technology Applanation tonometry (SphygmoCor, AtCor, Australia) Assessment of the arterial stiffness by volume sphygmography. Flow-mediated vasodilation Six-minute walk test Computer pulse oximetry (PulseOx 7500 (SPO medical, Israel) Adherence to Treatment: Counting remaining pills and completing the Morisky-Green Questionnaire Assessment of quality of life Assessment of physical activity: International Questionnaire On Physical Activity - IPAQ Hospital Anxiety and Depression Scale (HADS)
Detailed Description
It is planned to include 200 patients hospitalized in the cardiology department of the "Penza Regional Clinical hospital Burdenko" with a STEMI diagnosis in combination with COVID-19. Patients with STEMI and NSTEMI will be included in the study within the first 15 days from the disease onset. The total follow-up period is 96 weeks. Primary goals: achieving the target level of low-density lipoprotein cholesterol (LDL-C) on the background of lipid-lowering therapy as monotherapy with atorvastatin or combined treatment with atorvastatin plus ezetimibe; decrease in the incidence of major coronary events - percutaneous coronary interventions (PCI) / coronary artery bypass surgery (CABG) for a new case of coronary atherosclerosis, hospitalization for unstable angina or recurrent myocardial infarction; reduction of the frequency of life-threatening arrhythmias and markers of the risk of sudden cardiac death according to the data of long-term ECG monitoring; increase in myocardial contractility by improving the deformation characteristics of the peri-infarction zone. Secondary goals: Assess the effect of long-term effective lipid-lowering therapy: indicators of global and regional myocardial deformation, depending on the degree of of coronary blood flow restoration according to TIMI scale; systolic and diastolic LV function in the presence of initial disturbances or the absence of negative dynamics of these indicators with normal initial values; on clinical and diagnostic criteria for the development or progression of heart failure (HF); on the dynamics of myocardial ischemia episodes according to the data of long-term electrocardiography (ECG) monitoring; for the immediate and long-term prognosis of patients; on the structural and functional properties of large arteries. Assess the dynamics of biochemical parameters against the background of double and monotherapy with lipid-lowering drugs. Assess the safety of treatment. Assess the impact on the patient's well-being and quality of life. Assess therapy compliance Conduct a comparative analysis of the prognostic value of markers of myocardial electrical heterogeneity, obtained from the data of long-term and 24-hour ECG monitoring. To determine the effect of markers of electrical instability and autonomic regulation of cardiac activity, obtained during long-term ECG monitoring in patients at different times after myocardial infarction, on the short-term and long-term prognosis. Development of a multivariate model that takes into account the parameters of electrophysiological heterogeneity and the main indicators of the cardiovascular system condition (data of echocardiography, blood vessels ultrasound, laboratory test), which allows predicting the development of repeated cardiac events. Methods and variables Office blood pressure 12-lead ECG Coronary angiography. Percutaneous coronary intervention Chemistry blood test The lipid profile: total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), triglycerides (TG) and low-density lipoprotein cholesterol (LDL-C), non-HDL. Alanine aminotransferase (ALT), aspartat aminotransferase (AST), creatine phosphokinase (CPK), glucose, C-reactive protein (CRP), brain natriuretic peptide (BNP), serum creatinine and glomerular filtration rate (CKD-EPI), troponin I/T, CPK-MB, ferritin, sodium, potassium, lactate, procalcitonin, D-dimer, coagulogram. Nasopharyngeal swab for SARS-CoV-2 to RNA by PCR, if necessary - additional determination of immunoglobulins to SARS-CoV-2. 2D and 3D transthoracic echocardiography is performed with Vivid GE 95 Healthcare (USA). The biplane ejection fraction is determined by the Simpson method, 3D ejection fraction, EDV (end-diastolic volume), ESV (end-systolic volume) and their indexed parameters in 2D and 3D mode. Left ventricular myocardial mass index (LVMI), LA volume. Myocardial deformity is analyzed using specialized software - EchoPac Software Only (General Electric Co., 2018) Multi-day 3-lead ECG monitoring with assessment of the parameters of myocardial electrical instability. Ultrasound of common carotid arteries using high-frequency RF signal technology will be carried out in B-mode on the MyLab 90 device (Esaote, Italy) by the following indicators: IMT - thickness of the intima-media, loc Psys - local systolic pressure in the carotid artery, loc Pdia - local diastolic pressure, P (T1) - pressure at a local point, stiffness indices β and α, DC - coefficient transverse distensibility, CC - transverse compliance coefficient, Aix - augmentation index, AR - amplification pressure, PWV - local pulse wave velocity in the carotid artery. Applanation tonometry The SphygmoCor device (AtCor Medical, Australia) includes two software. The first allows to record indicators of central aortic pressure: systolic aortic pressure - SBPao, diastolic - DBPao, pulse pressure - PPao, mean hemodynamic pressure - MBPao. The PWV (pulse wave velocity) software is used to analyze the PWV in the aorta (cfPWV). Assessment of the arterial stiffness by volume sphygmography. PWV in the aorta (PWV), in elastic arteries right and left (R/L-PWV) and in muscular arteries (B-PWV), Cardio-Ankle Vascular Index - CAVI. Flow-mediated vasodilation 6-minute walk test Computer pulse oximetry (PulseOx 7500 (SPO medical, Israel) Adherence to Treatment: Counting remaining pills and completing the Morisky-Green Questionnaire Assessment of quality of life: Seattle Angina Questionnaire (SAQ), Minnesota LIGE with Heart Failure Questionnaire, Clinical Status Assessment Scale (CASA), analog-visual scale. Assessment of physical activity International Questionnaire On Physical Activity - IPAQ Hospital Anxiety and Depression Scale (HADS) Endpoint assessment The end point is understood as the development of repeated AMI, unstable angina pectoris, PCI for a new atherosclerotic plaque, hospitalization due to chronic heart failure (CHF) exacerbation, the development of a new case of CHF II-IV NYHA class, death.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
STEMI, Covid19, NSTEMI
Keywords
myocardial strain, arterial stiffness, myocardial electrical heterogeneity, quality of life

7. Study Design

Primary Purpose
Treatment
Study Phase
Not Applicable
Interventional Study Model
Sequential Assignment
Masking
None (Open Label)
Allocation
Non-Randomized
Enrollment
200 (Anticipated)

8. Arms, Groups, and Interventions

Arm Title
Atorvastatin 80 mg
Arm Type
Active Comparator
Arm Description
Initially, hypolipidemic treatment with atorvastatin at a dose of 80 mg / day is prescribed from the first 24-96 hours of myocardial infarction in addition to standard therapy for the disease.
Arm Title
Atorvastatin-Ezetimibe
Arm Type
Active Comparator
Arm Description
In the absence of reaching the target level of LDL-C ≤1.4 mmol / L and ≥50% of the initial level after 4-6 weeks from the onset of myocardial infarction, patients additionally receive ezetimibe at a dose of 10 mg 1 time / day.
Intervention Type
Drug
Intervention Name(s)
Atorvastatin 80mg
Other Intervention Name(s)
Atorvastatin
Intervention Description
Initially, hypolipidemic treatment with atorvastatin at a dose of 80 mg / day is prescribed from the first 24-96 hours of myocardial infarction in addition to standard therapy for the disease.
Intervention Type
Drug
Intervention Name(s)
Atorvastatin-Ezetimibe
Other Intervention Name(s)
Atorvastatin
Intervention Description
In the absence of reaching the target level of LDL-C ≤1.4 mmol / L and ≥50% of the initial level after 4-6 weeks from the onset of myocardial infarction, patients additionally receive ezetimibe at a dose of 10 mg 1 time / day.
Primary Outcome Measure Information:
Title
Lipid profile assessment
Description
Achievement of target level of lipid profile (total cholesterol, LDL-С, HDL-C, triglycerides) during the atorvastatin therapy
Time Frame
up to 96 weeks
Title
Assessment of ventricular rhythm disturbances
Description
The frequency of ventricular arrhythmias recorded with 24 hour ECG monitoring
Time Frame
up to 96 weeks
Title
Electrical instability and autonomic regulation of heart rate
Description
Changes in parameters of electrical instability and autonomic regulation of heart rate recorded with 24 hour ECG monitoring
Time Frame
up to 96 weeks
Title
Left ventricular systolic function
Description
Assessment of LV systolic function differences according to echocardiography during atorvastatin treatment
Time Frame
up to 96 weeks
Title
Left ventricular myocardial deformation (strain, strain rate)
Description
Assessment of LV myocardial deformation (strain, strain rate) differences according to echocardiography during atorvastatin treatment
Time Frame
up to 96 weeks
Title
Number of Participants with major cardiovascular events
Description
Number of Participants with major cardiovascular events: PCI / CABG for a new case of coronary atherosclerosis, hospitalizations for unstable angina pectoris, recurrent AMI
Time Frame
up to 96 weeks

10. Eligibility

Sex
All
Minimum Age & Unit of Time
30 Years
Maximum Age & Unit of Time
70 Years
Accepts Healthy Volunteers
No
Eligibility Criteria
Inclusion Criteria: Signed informed consent Patients of both genders aged 30 to 70 years The presence of one of the options for a combination of confirmed myocardial infarction and new coronavirus infection: 3.1. Myocardial infarction that developed within 30 days from the onset of COVID-19 - in case of mild to moderate course or within 60 days - in case of severe course. 3.2. Development of a confirmed case of COVID-19 within 30 days from the myocardial infarction onset. 4.1. Clinical manifestations of acute respiratory infection (body t> 37.5 ° C and one or more signs: cough, dry or moist sputum, shortness of breath, chest tightness, SpO2 ≤ 95%, sore throat, mild or moderate rhinorrhea, impaired or loss of smell (hyposmia or anosmia), loss of taste (dysgeusia), conjunctivitis, weakness, muscle pain, headache, vomiting, diarrhea, skin rash) in the presence of at least one of the epidemiological signs: returning from a foreign trip 14 days before the onset of symptoms; having close contacts in the last 14 days with a person under surveillance for COVID-19 who subsequently fell ill; having close contacts in the last 14 days with a person with a laboratory confirmed diagnosis of COVID-19; having professional contacts with people who have a suspected or confirmed case of COVID-19. 4.2. The presence of clinical manifestations specified in 4.1, in combination with changes in the lungs according to computed tomography data, regardless of the results of a single laboratory study for the presence of SARS-CoV-2 RNA and an epidemiological history, or if it is impossible to conduct a laboratory study for the presence of SARS-RNA CoV-2. 4.3. A positive laboratory test result for the presence of SARS-CoV-2 RNA using nucleic acid amplification methods (NAA) or SARS-CoV-2 antigen using immunochromatographic analysis, regardless of clinical manifestations. 4.4. Positive result for IgA or IgM, or IgM with IgG in patients with clinically confirmed COVID-19 infection. Primary STEMI or NSTEMI, confirmed by a diagnostically significant increase in cardiospecific enzymes (5.1) in combination with at least one criterion of acute myocardial ischemia (item 5.2): 5.1. An increase and / or decrease of serum cardiac troponin level, which should at least once exceed the 99th percentile of the URL in patients without an initial increase of serum cardiac troponin level, or its increase> 20% with an initially increased level of cardiac troponin, if up to it remained stable (variation < 20%) or declined. 5.2. Typical anginal attack / acute ischemic changes on the ECG / the appearance of pathological Q waves on the ECG / EchoCG confirmation of the presence of new areas of the myocardium with impaired local contractility / detection of intracoronary thrombosis in coronary angiography. Presence of type 1 myocardial infarction (6.1) or type 2 (6.2), confirmed by coronary angiography: 6.1. Atherothrombosis of an infarct-related artery with a sharp decrease in blood flow distal to the damaged atherosclerotic plaque or distal embolization with thrombotic masses / fragments of atherosclerotic plaque, followed by the development of myocardial necrosis; or intramural hematoma in a damaged atherosclerotic plaque with a rapid increase in its volume and a decrease in the lumen of the artery). 6.2. Myocardial infarction developed as a result of ischemia caused by non-thrombotic complications of coronary atherosclerosis. Pathophysiologically, such myocardial infarctions are associated with an increase in myocardial oxygen demand and / or a decrease in its delivery to the myocardium, for example, due to coronary artery embolism, spontaneous coronary artery dissection, respiratory failure, anemia, cardiac arrhythmias, arterial hypertension or hypotension, etc. Duration of subsequent hospitalization after inclusion in the study - at least 5 days Exclusion Criteria: Hemodynamically significant stenosis of the left coronary artery> 30%. Recurrent or repeated STEMI or NSTEMI. Exogenous hypertriglyceridemia (type 1 hyperchylomicronemia - TC / TG <0.15). Acute heart failure III-IV. Individual intolerance to statins, ezetimibe, alirocumab. Congenital and acquired heart defects. Non-sinus rhythm, artificial pacemaker. Sinoatrial and atrioventricular block of 2-3 degrees. QRS complex> 100 ms. Complete blockade of left or right bundle branch. History of CHF III-IV class according to NYHA. The presence of pronounced LV hypertrophy according to echocardiography (IVS / LVS> 14 mm). Uncontrolled hypertension with SBP> 180 mm Hg. and DBP> 110 mm Hg. Diabetes mellitus type 1 or type 2 requiring insulin therapy. Presence of anemia at the time of screening (Hb <100 g / l) Chronic kidney disease (GFR < 30 ml / min / 1.73 m2 according to the CKD-EPI formula). Uncorrected thyroid dysfunction in the presence of hyper- / hypothyroidism. Body mass index (BMI) ≥35 kg / m2. Pregnancy, lactation. Alcohol abuse, drug use. Other severe concomitant diseases that exclude the possibility of participation in the study. Participation in other clinical trials within the previous 2 months.
Central Contact Person:
First Name & Middle Initial & Last Name or Official Title & Degree
Valentin Oleynikov, DM
Phone
+78412548229
Email
V.oleynikof@gmail.com
First Name & Middle Initial & Last Name or Official Title & Degree
Nadezhda Burko, PhD
Phone
89869366220
Email
nsergatskaya@gmail.com
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Valentin Oleynikov
Organizational Affiliation
Penza State University
Official's Role
Principal Investigator
Facility Information:
Facility Name
Valentin Oleynikov
City
Penza
ZIP/Postal Code
440026
Country
Russian Federation
Individual Site Status
Recruiting
Facility Contact:
First Name & Middle Initial & Last Name & Degree
Valentin Oleynikov, Prof.
Phone
+78412548229
Email
v.oleynikof@gmail.com
First Name & Middle Initial & Last Name & Degree
Nadezhda Burko, PhD
Phone
+78412548229
Email
hopeful.n@mail.ru

12. IPD Sharing Statement

Learn more about this trial

Evaluation of the Effect of Long-term Lipid-lowering Therapy in STEMI Patients With Coronavirus Infection COVID-19

We'll reach out to this number within 24 hrs