Jee Main 2023 Question Paper Pdf Download Resonance
Patricia Gluth
We have gathered a detailed analysis of the past seven years' jee main question paper with solution pdf download and Video Solutions. This analysis will help students to get acquainted with the changes in the paper pattern, types of questions asked from different chapters.
Being a JEE aspirant, it is very important to understand the importance of Previous Year JEE Main Question Papers. As they will serve as one of the most important tool to crack the JEE Main Examination. This way a student can develop a thorough understanding of the pattern of the examination and the questions asked.
Solving Previous Year Question Papers also helps a student in more ways than one. First, it helps a student to understand the various sections of the question paper so that he/she can manage his/her time properly. Second, it gives a student an opportunity to analyse from his/ her mistakes and figure out which areas need revision. And also gives them an opportunity to solve their doubts at the earliest instance possible. Students will get habituated to solve questions in a fixed time frame while solving the Previous Year Question Papers.
It is a powerful tool which students to be familiarized with the JEE Main Previous Year Question Papers and the marking scheme and topic weightage beforehand. Another important benefit of going through the detailed analysis of Previous Year JEE Main Question Papers is that it will help students to identify questions which are often repeated and how can questions be turned in the examination. And also help them find the best way to solve the questions.
Despite decades of accruing evidence supporting the clinical utility of cardiovascular magnetic resonance (CMR), adoption of CMR in routine cardiovascular practice remains limited in many regions of the world. Persistent use of long scan times of 60 min or more contributes to limited adoption, though techniques available on most scanners afford routine CMR examination within 30 min. Incorporating such techniques into standardize protocols can answer common clinical questions in daily practice, including those related to heart failure, cardiomyopathy, ventricular arrhythmia, ischemic heart disease, and non-ischemic myocardial injury.
In this white paper, we describe CMR protocols of 30 min or shorter duration with routine techniques with or without stress perfusion, plus specific approaches in patient and scanner room preparation for efficiency. Minimum requirements for the scanner gradient system, coil hardware and pulse sequences are detailed. Recent advances such as quantitative myocardial mapping and other add-on acquisitions can be incorporated into the proposed protocols without significant extension of scan duration for most patients.
In this white paper, fully aligned with international cardiovascular practice guidelines and Society for Cardiovascular Magnetic Resonance standards for high quality CMR [23], we offer a basic 30-min or shorter CMR exam that answers many of the common clinical questions in cardiovascular practice including those articulated above.
Table 1 summarizes 4 common clinical questions answerable by a standardized 30-min CMR exam. In addition to these questions, the proposed protocols can be used in many other clinical scenarios as they form the core for every CMR exam.
Precision in diagnosis is essential to guide effective treatment for patients with heart failure or cardiomyopathy [10, 24]. Common clinical questions include: What are the left ventricular (LV) ejection fraction (LVEF) and right ventricular (RV) ejection fractions (RVEF)? What is the underlying cause of ventricular dysfunction? Does this patient need an implantable cardioverter-defibrillator (ICD)? Should family members be screened?
Why does my patient have ventricular arrhythmia? The answer to this question is critical, as ventricular arrhythmias can be life-threatening and often denote the presence of underlying heart disease. An understanding of the mechanism of the ventricular arrhythmia can help define prognosis and guide treatment. Ventricular arrhythmias are often mediated by reentry around or triggered activity from within damaged myocardium. Because of its ability to accurately characterize cardiac structure and function, CMR is well suited to diagnose a wide range of underlying cardiomyopathies known to be associated with ventricular arrhythmias [38,39,40].
Clinicians often see patients who present with chest pain with no evidence of significant CAD, including those with myocardial infarction with no obstructive coronary arteries (MINOCA). Common questions in these patients include: Why does my patient have acute symptoms, abnormal cardiac biomarkers but no epicardial coronary artery disease? The differential diagnosis includes plaque rupture, embolism, coronary spasm, and microvascular causes. Another major cause includes non-ischemic myocardial inflammation or myocarditis, a mechanism highlighted by the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) pandemic. Here, CMR again is the standard for appropriate diagnosis and management and the only non-invasive test that can accurately differentiate between ischemic and non-ischemic cardiac injury while also detecting myocardial and pericardial inflammation [57].
Typical Clinical Questions and Workflow for a 30-min CMR Exam: Many common questions in cardiovascular practice can be answered with cine, perfusion, and late gadolinium enhancement (LGE) imaging. Myocardial mapping, phase contrast imaging, and other sequences can easily be added to this workflow if available and useful to answer clinical questions for an individual patient
A number of common clinical questions can be addressed with a basic CMR exam that can easily be performed within 30 min or less on most scanners in any clinical practice setting. Members of the CMR team, partnering with facility stakeholders and referring clinicians is needed to improve access to CMR, and to translate decades of innovation to favorable impact the care of patients with a broad range of known or suspected cardiovascular disorders. Moreover, this efficient examination should be less cumbersome for both patients and technologists and can improve workflow for interpreting physicians. Not covered in this work is the importance of training for physicians and technologists seeking to advance access to CMR for their patients. Expanded training centers across regions can further support such clinicians growing CMR at both academic and private facilities. While this document has emphasized very well-established techniques, a follow-up document will be forthcoming that details some of the more contemporary techniques such as real-time imaging for even more efficient CMR examinations.
Dr Seiberlich receives research support from Siemens Healthineers (Erlangen, Germany). Dr Markl has received research support from Siemens Healthineers, a research grant and consulting fees from Circle Cardiovascular Imaging (Calgary, Alberta, Canada). and a research grant from Cryolife Inc (Kennesaw, Georgia, USA). All other authors have reported that they have no relationships relevant to the contents of this paper to disclose.
This chapter is relevant to Section G6(ii) of the 2023 CICM Primary Syllabus, which asks the exam candidate to "describe the principles of measurement, limitations, and potential sources of
error for pressure transducers, and their calibration". The concepts of resonance and damping fall neatly into the category of limitations and potential sources of error. For a variety of sensible reasons, the college examiners have clearly prioritised this topic, and it appears in multiple past paper questions:
In spite of how common these questions have been, they are still done very poorly, with a pass rate ranging between 25% and 33%. The topic had also come up once in the Part II exam, in Question 11.2 from the first paper of 2010 where candidates were expected to comment on the "fidelity" of the pressure transducer system which was shown undergoing a fast flush test. The interpretation of fast flush tests and other practical matters related to the "fidelity" of the arterial transducer system are discussed in the section on arterial line dynamic response testing. In many ways, this is a huge self-indulgent redux version of that chapter. From the standpoint of exam preparation, it would be possible to skip this entire chapter and only review the brief square wave test section in the Fellowship Exam required reading chapter on the information derived from arterial line waveforms.
Elasticity, the tendency of a volume to return to its initial shape after being distorted, is used in the formula given above (from Gilbert's paper), which is adapted to the specific case scenario of the fluid-filled transducer. However, Gilbert uses E to describe the deformability of the transducer diaphragm (the change in volume which occurs per unit change of pressure). On closer inspection, that's actually elastance.
The natural frequency of a system plays a role in how the system responds to sustained stimuli. Consider the system as it sits there after the last impulse, oscillating and slowly coming to rest. If another stimulus occurs (a new wave arrives), it interacts with the existing waveform. If the new waves arrive at the same frequency as the natural frequency of the system, the peaks will coincide and the sum of the amplitudes will be greater (the peaks will be higher). Similarly, the troughs will be lower. This tendency of system to oscillate with greater amplitude at the natural frequency than at other frequencies is resonance.
The natural frequency of the transducer system needs to be much higher than the fundamental frequency of the pulse wave. With a low natural frequency, the fundamental frequency or some of the first few harmonics would end up being amplified by resonance, and because these are already high-amplitude waves the effect on the summed waveform would be quite significant. If the natural resonance of the transducer system is closer to the eighth harmonic, resonance will still amplify that waveform, but because the amplitude of this harmonic is very low, the effect on the summed waveform will be minimal. Ergo, transducer systems need to have a minimum natural frequency at least eight times the expected maximum frequency of the expected fundamental frequency of the measured system. Most commercially available systems analyse eight harmonics; thus to maintain accuracy for pulse rates up to 180 bpm (3 Hz), the natural frequency of the system needs to be at least (3 8) = 24 Hz. Generally speaking commercially available systems have a natural frequency well above this value (usually 200Hz) but we interfere with this by adding tubing, stopcocks, cannulae, three-way taps and air bubbles. How much interference this causes can actually be measured - you can assess the natural frequency of the completed arterial line transducer setup by doing a fash flush test (the wavelength of the oscillations which occur after the square wave is the natural frequency).
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