This document discusses the potential for non-invasive coronary angiography using computed tomography (CT) techniques such as electron beam CT (EBCT) and multi-slice CT (MSCT). It provides an overview of the history and technological developments of CT as well as results of studies evaluating the diagnostic accuracy of EBCT and MSCT for detecting coronary artery disease compared to invasive angiography. The document concludes that with improvements in rotation speed and larger detector arrays, fast MSCT is becoming the leading screening technique for non-invasive detection of coronary stenosis without radiation or contrast exposure of invasive methods.
The field of transcatheter mitral valve repair (TMVr) for
mitral regurgitation (MR) is rapidly evolving. Besides the
well-established transcatheter mitral edge-to-edge repair
approach, there is also growing evidence for therapeutic
strategies targeting the mitral annulus and mitral valve
chordae. A patient-tailored approach, careful patient
selection and an experienced interventional team is crucial
in order to optimise procedural and clinical outcomes. With
further data from ongoing clinical trials to be expected,
consensus in the Heart Team is needed to address these
complexities and determine the most appropriate TMVr
therapy, either single or combined, for patients with severe
MR
Retrograde access to seal a large coronary perforationRamachandra Barik
The sealing of a large vessel coronary perforation during percutaneous coronary intervention typically requires the
deployment of 1 or more covered stents. A novel approach to seal a life-threatening perforation caused by unnoticed
wire-exit and balloon dilation, utilizing retrograde techniques, without a covered-stent is described.
The field of transcatheter mitral valve repair (TMVr) for
mitral regurgitation (MR) is rapidly evolving. Besides the
well-established transcatheter mitral edge-to-edge repair
approach, there is also growing evidence for therapeutic
strategies targeting the mitral annulus and mitral valve
chordae. A patient-tailored approach, careful patient
selection and an experienced interventional team is crucial
in order to optimise procedural and clinical outcomes. With
further data from ongoing clinical trials to be expected,
consensus in the Heart Team is needed to address these
complexities and determine the most appropriate TMVr
therapy, either single or combined, for patients with severe
MR
Retrograde access to seal a large coronary perforationRamachandra Barik
The sealing of a large vessel coronary perforation during percutaneous coronary intervention typically requires the
deployment of 1 or more covered stents. A novel approach to seal a life-threatening perforation caused by unnoticed
wire-exit and balloon dilation, utilizing retrograde techniques, without a covered-stent is described.
Improved non-calcified plaque delineation on coronary CT angiography by sonog...Paul Schoenhagen
Purpose: To prospectively compare non-calcified plaque delineation and image quality of coronary computed tomography angiography (CCTA) obtained with sinogram-affirmed iterative reconstruction (IR) with different filter strengths and filtered back projection (FBP).
XXVII Reunión anual de la sección de Hemodinámica y Cardiología Intervencionista
16 y 17 de junio de 2016 León
http://secardiologia.es/xxvii-reunion-anual-de-la-seccion-de-hemodinamica-y-cardiologia-intervencionista
Aportaciones del grupo CORPAL en intervencionismo coronario
Alfonso Medina Fernández-Aceytuno (Hosp. Univ. Doctor Negrín. Las Palmas de Gran Canaria)
What is New in Cardiac CT? In Search of the Comprehensive and Conclusive Hear...Apollo Hospitals
Coronary CT Angiography (CT) with its noninvasive cross sectional information has seen remarkable growth in recent years. With the introduction of the new generation scanners, like the 320-slice CT, it has risen to a whole new level. Percent diameter stenosis determined with the use of 320-slice CT shows good correlation with Invasive catheter angiogram (ICA) without significant underestimation or overestimation. Plaque composition on CT regardless of lesion severity has emerged as a strong predictor of major cardiac events. The percentage stenosis mismatch between CT and ICA can be explained by the 2 dimensional nature of ICA and its interpretive inconsistencies. In the upcoming years, we need to evolve from focusing on lumen stenosis to a comprehensive assessment of CAD and its impact on patient outcome.
Unlike other modalities, MRI offers the capability to modulate both the emitted and received signals so that a multitude of tissue characteristics can be examined and differentiated without the need to change scanner hardware.
As a result, from a single imaging session, one could obtain a wealth of information regarding
cardiac function and morphology,
myocardial perfusion & viability,
hemodynamics,
large vessel anatomy.
CMR is now considered the gold standard for the assessment of regional and global systolic function, myocardial infarction (MI) and viability, and the assessment of congenital heart disease.
Improved non-calcified plaque delineation on coronary CT angiography by sonog...Paul Schoenhagen
Purpose: To prospectively compare non-calcified plaque delineation and image quality of coronary computed tomography angiography (CCTA) obtained with sinogram-affirmed iterative reconstruction (IR) with different filter strengths and filtered back projection (FBP).
XXVII Reunión anual de la sección de Hemodinámica y Cardiología Intervencionista
16 y 17 de junio de 2016 León
http://secardiologia.es/xxvii-reunion-anual-de-la-seccion-de-hemodinamica-y-cardiologia-intervencionista
Aportaciones del grupo CORPAL en intervencionismo coronario
Alfonso Medina Fernández-Aceytuno (Hosp. Univ. Doctor Negrín. Las Palmas de Gran Canaria)
What is New in Cardiac CT? In Search of the Comprehensive and Conclusive Hear...Apollo Hospitals
Coronary CT Angiography (CT) with its noninvasive cross sectional information has seen remarkable growth in recent years. With the introduction of the new generation scanners, like the 320-slice CT, it has risen to a whole new level. Percent diameter stenosis determined with the use of 320-slice CT shows good correlation with Invasive catheter angiogram (ICA) without significant underestimation or overestimation. Plaque composition on CT regardless of lesion severity has emerged as a strong predictor of major cardiac events. The percentage stenosis mismatch between CT and ICA can be explained by the 2 dimensional nature of ICA and its interpretive inconsistencies. In the upcoming years, we need to evolve from focusing on lumen stenosis to a comprehensive assessment of CAD and its impact on patient outcome.
Unlike other modalities, MRI offers the capability to modulate both the emitted and received signals so that a multitude of tissue characteristics can be examined and differentiated without the need to change scanner hardware.
As a result, from a single imaging session, one could obtain a wealth of information regarding
cardiac function and morphology,
myocardial perfusion & viability,
hemodynamics,
large vessel anatomy.
CMR is now considered the gold standard for the assessment of regional and global systolic function, myocardial infarction (MI) and viability, and the assessment of congenital heart disease.
Couples presenting to the infertility clinic- Do they really have infertility...Sujoy Dasgupta
Dr Sujoy Dasgupta presented the study on "Couples presenting to the infertility clinic- Do they really have infertility? – The unexplored stories of non-consummation" in the 13th Congress of the Asia Pacific Initiative on Reproduction (ASPIRE 2024) at Manila on 24 May, 2024.
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Explore natural remedies for syphilis treatment in Singapore. Discover alternative therapies, herbal remedies, and lifestyle changes that may complement conventional treatments. Learn about holistic approaches to managing syphilis symptoms and supporting overall health.
Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
MANAGEMENT OF ATRIOVENTRICULAR CONDUCTION BLOCK.pdfJim Jacob Roy
Cardiac conduction defects can occur due to various causes.
Atrioventricular conduction blocks ( AV blocks ) are classified into 3 types.
This document describes the acute management of AV block.
Lung Cancer: Artificial Intelligence, Synergetics, Complex System Analysis, S...Oleg Kshivets
RESULTS: Overall life span (LS) was 2252.1±1742.5 days and cumulative 5-year survival (5YS) reached 73.2%, 10 years – 64.8%, 20 years – 42.5%. 513 LCP lived more than 5 years (LS=3124.6±1525.6 days), 148 LCP – more than 10 years (LS=5054.4±1504.1 days).199 LCP died because of LC (LS=562.7±374.5 days). 5YS of LCP after bi/lobectomies was significantly superior in comparison with LCP after pneumonectomies (78.1% vs.63.7%, P=0.00001 by log-rank test). AT significantly improved 5YS (66.3% vs. 34.8%) (P=0.00000 by log-rank test) only for LCP with N1-2. Cox modeling displayed that 5YS of LCP significantly depended on: phase transition (PT) early-invasive LC in terms of synergetics, PT N0—N12, cell ratio factors (ratio between cancer cells- CC and blood cells subpopulations), G1-3, histology, glucose, AT, blood cell circuit, prothrombin index, heparin tolerance, recalcification time (P=0.000-0.038). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and PT early-invasive LC (rank=1), PT N0—N12 (rank=2), thrombocytes/CC (3), erythrocytes/CC (4), eosinophils/CC (5), healthy cells/CC (6), lymphocytes/CC (7), segmented neutrophils/CC (8), stick neutrophils/CC (9), monocytes/CC (10); leucocytes/CC (11). Correct prediction of 5YS was 100% by neural networks computing (area under ROC curve=1.0; error=0.0).
CONCLUSIONS: 5YS of LCP after radical procedures significantly depended on: 1) PT early-invasive cancer; 2) PT N0--N12; 3) cell ratio factors; 4) blood cell circuit; 5) biochemical factors; 6) hemostasis system; 7) AT; 8) LC characteristics; 9) LC cell dynamics; 10) surgery type: lobectomy/pneumonectomy; 11) anthropometric data. Optimal diagnosis and treatment strategies for LC are: 1) screening and early detection of LC; 2) availability of experienced thoracic surgeons because of complexity of radical procedures; 3) aggressive en block surgery and adequate lymph node dissection for completeness; 4) precise prediction; 5) adjuvant chemoimmunoradiotherapy for LCP with unfavorable prognosis.
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
Maxilla, Mandible & Hyoid Bone & Clinical Correlations by Dr. RIG.pptx
182 non invasive coronary angiography
1. Non-Invasive Coronary Angiography;
The Future Is Here “Fast MSCT”!
Provided by:
Alireza Zarrabi, M.D.
Center for Vulnerable Plaque Research,
Texas Heart Institute and University of Texas - Houston
Editorial Slides
VP Watch – October 16, 2002 - Volume 2, Issue 41
2. 1979 Nobel Prize in Medicine and
Physiology went to Hounsfield and
McCormack for invention of computed
tomography.
Godfrey Hounsfield Allan MacLeod Cormack
3. Non-invasive imaging of coronary arteries has
been a dream for cardiovascular medicine that
is now coming close to reality.
However, imaging of small arteries
(coronaries) on a moving target body (heart) is
a complicated and challenging situation.
There is no time in which all portions of the
heart are at rest and this fact contributes to
limitations for any tomographic imaging
method that requires fixed exposure time.
4. CT, EBCT, and MRI are competing techniques
for non-invasive imaging of coronary arteries.
Each of the above technology has some
advantages and disadvantages that prevent
them from being a unique solution superior to
the others to completely serve the purpose of
non-invasive diagnosis of future culprit lesions
(vulnerable plaque) as a widely available
clinical tool.
5. MR angiography has been a progressive process in recent years.
n Sensitivity Specificity
Post et al 1996 20 38% 95%
Müller et al 1997 30 83% 94%
Achenbach et al 1997 73 65% 88%
Sandstede et al 1999 30 81% 89%
van Geuns et al 1999 32 50% 91%
Leithmonnier et al 1999 20 65% 93%
Sardanelli et al 2000 42 82% 89%
Regenfus et al 2001 50 87% 91%
Kim et al 2001 107 83% 73%
The feasibility of MRI to quantify plaque morphology has been demonstrated
ex vivo in human carotid tissue and in vivo in animal models. 1,2
6. MR Imaging and MR Angiography :
Advantages
Non-invasive
No need for contrast media
Detailed plaque characterization
Disadvantages
Poor spatial resolution
Inadequate temporal resolution
High cost
7. Milestone in CT
1967 Pattern recognition and reconstruction techniques using computer – G.
Hounsfield
1971 The first clinical prototype CT brain scanner – Ambrose
1974 The first whole-body CT scanner – Robert Ledley
1979 Nobel Prize in Medicine and Physiology – Hounsfield and MacLeod Cormack
1979 The first principle and operation of the electron beam CT (EBCT) scanner –
Douglas Boyd
1983 The first EBT scanner developed by Imatron and named cardiovascular
computed tomography
1988 The first coronary calcium study
1989 The first report of a practical spiral CT scanner (single-slice spiral CT)– Willi
Kalender
1992 Dual-slice spiral CT scanner
1995 The first CT coronary angiography
1998 Multi-slice CT scanner
8. In old conventional CT the x-ray tube and detectors
rotate for 360 degrees or less to scan one slice while the
table and patient were stationary which was time
consuming.
In next generation In 1989 the first report of a practical
spiral CT scanner was presented at RSNA meeting by
Dr. Willi Kalender.
The next step forward has been the introduction of
multi-slice CT (MSCT) scanner at the RSNA 1998.
9. CT screening has been the center of attention in the
field of clinical diagnostic imaging during the past
few years for different purposes such as coronary
artery calcification, lung cancer, colonoscopy, and
whole body scan.
CT claims several applications in the field of
cardiovascular imaging:
Coronary calcium imaging
CT angiography
Assessment of cardiac function
10. Electron beam computed tomography
(EBT) can accurately identify presence
of calcification in the coronary tree non-
invasively.
Coronary calcification is not normal and
clearly indicates presence of
atherosclerosis.
11. Rumberger et al. stated important conclusion
for using EBT: 6,7
Coronary calcium area per individual
coronary artery and/or per whole heart as
defined by EBT is highly correlated with
histologically quantified coronary plaque
area.
12. Guerci, Arad, and colleagues also found that
in asymptomatic adults, EBCT of coronary
arteries predicts coronary death and nonfatal MI
and the need for revascularization procedures. 4
Rumberger and others showed the ranges for
EBT coronary calcium score cutpoints that
predict the likely severity of associated maximal
angiographic stenosis severity to a high
sensitivity, high specificity or optimal
sensitivity/specificity. 5
Dr. Arad
Dr. Guerci
13. Budoff, Raggi, and colleagues showed
that EBT calcium scanning provides
incremental and independent power in
predicting the severity and extent of
angiographically significant CAD in
symptomatic patients, in conjunction with
pretest probability of disease. 3
14. # of patients Sens. Spec.
Nakanishi et al. 1997 37 74% 91%
Schmermund 1998 28 82% 88%
Achenbach 1998 125 92% 94%
Ropers 2000 118 90% 82%
Achenbach 2000 36 92% 91%
Achenbach 1999 56
Occlusion 100% 100%
Stenosis 100% 97%
Sensitivity and Specificity of EBCT for Obstructive
Coronary Disease As Compared With Invasive
Coronary Arteriography
15. Achenbach et al. for the first time established
a
protocol for the visualization of coronary
arteries by EBT. 8
EBT has been used as a noninvasive 3D
arteriography of the large epicardial coronary
arteries, to visualize coronary artery bypass
grafts, and also to characterize coronary artery
anomalies.
CT Angiography
16. EBT MSCT
True temporal resolution 50-100 ms 230-1000 ms
Spatial resolution 1.5 mm vessels 1.0mm vessels
Practical heart rate
limitations for a Dx study
50-100 bpm <60-65 bpm
Cardiac function &
myocardial perfusion
Yes No
Radiation exposure, mSv 1-2 2-10
Clinical availability Increasing slowly Expanding rapidly
Coronary calcium
quantitation
Yes, extensively validated Yes, limited validation
EBT vs. MSCT
Adapted from: Noninvasive Coronary Angiography Using Computed Tomography: Ready to Kick It Up Another
Notch? Circulation. 2002 Oct 15;106(16):2036-2038
17. Comparing MSCT and Invasive
Angiography
n Sens Spec
Nieman et al 2001 31 81% 97%
Achenbach et al. 2001 64 91% 84%
Knez et al. 2001 42 78% 98%
Nieman et al. 2002 59 95% 86%
18. As reported in VP Watch of this week,
Nieman and colleagues performed ECG-gated MSCT
angiography with a 16-slice MSCT scanner (0.42-s
rotation time, 12x0.75-mm detector collimation) in
selective patients with suspected obstructive coronary
artery disease.
Additional ß-blockers were given 1 hour before the
procedure to those patients with a resting heart rate
>65 beats/minute. Average heart rate during study
was 56 beats/min.
19. MSCT scanner used for this study has a rotational
speed of 440 ms and can achieve cardiac tomographic
slice thicknesses of <1.0 mm.
They showed the overall sensitivity and specificity to
detect significantly stenosed coronary arteries was 95%
and 86%.
The predictive value of MSCT angiography to detect
patients with no, single, or multivessel disease in this
study was 100%, 75%, and 74%, respectively.
20. Conclusion:
The use of 16-slice CT scanner with 400ms
rotation time, combined with ß-blocking agent
has significantly improved the diagnostic
accuracy of MSCT to non-invasive detection
of coronary stenosis.
Fast MSCT is moving fast to become the first
screening imaging technique for detection of
coronary artery disease.
21. Questions:
Which one of the following should be
considered as first step imaging in
screening for vulnerable plaques in
vulnerable patients?
EBT
MSCT
MRI / MRA
22. Questions:
Despite improvements in rotational
acquisition speed above most current
helical scanners, resting heart rate
would still be a major factor in image
quality by MSCT. What is the next step:
Faster CT (decrease rotation time)?
Or
Larger detectors (32, 64, or more slices)?
23. 1) J.F. Toussaint, G.M. LaMuraglia, J.F. Southern, V. Fuster and H.L. Kantor, Magnetic
resonance images lipid, fibrous, calcified, hemorrhagic, and thrombotic components of
human atherosclerosis in vivo. Circulation 94 (1996), pp. 932¯938.
2) S.G. Worthley, G. Helft, V. Fuster, Z.A. Fayad, O.J. Rodriguez, A.G. Zaman, J.T. Fallon
and J.J. Badimon, Noninvasive in vivo magnetic resonance imaging of experimental
coronary artery lesions in a porcine model. Atherosclerosis 150 (2000), pp. 321¯329.
3) Continuous probabilistic prediction of angiographically significant coronary artery
disease using electron beam tomography. Circulation. 2002 Apr 16;105(15):1791-6.
4) Prediction of coronary events with electron beam computed tomography. J Am Coll
Cardiol. 2000 Oct;36(4):1253-60.
5) Electron beam computed tomographic coronary calcium score cutpoints and severity of
associated angiographic lumen stenosis. J Am Coll Cardiol. 1997 Jun;29(7):1542-8.
6) Rumberger JA, Sheedy PF, Breen JF. Use of ultrafast (cine) x-ray computed tomography
in cardiac and cardiovascular imaging. In: Giuliani ER, Gersh BJ, McGoon MD, et al, eds.
Mayo Clinic Practice of Cardiology. 3rd ed. St. Louis, Mo: Mosby; 1996: 303–324.
7) Rumberger JA, Simons DB, Fitzpatrick LA, et al. Coronary artery calcium areas by
electron beam computed tomography and coronary atherosclerotic plaque area: a
histopathologic correlative study. Circulation. 1995; 92: 2157–2162
8) Achenbach S, Moshage W, Bachmann K. Coronary angiography by electron beam
tomography. Herz. 1996; 21: 106–111
References