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Student's Corner–2 Published online: 2020-12-31 THIEME 364 Student’s Student's CornerCorner–2 Jyotsna et al. Student’s Corner–2 Dayasagar Rao2 P. Sampath Kumar3 1Cardiology Department, KIMS, Hyderabad, Telangana, India Address for correspondence Maddury Jyotsna, MD DM FACC 2Cardiology Department, Osmania, Hyderabad, Telangana, India FESC FICC, NIMS (Nizam institute of medical sciences), Punjagutta, Hyderabad, Telangana, 500082, India (e-mail: [email protected]). Ind J Car Dis Wom:2020;5:364–367 Q1. Why DBP Does not Vary with AV In the above question, for the patient with AV dissociation Dissociation and Atrial Fibrillation and atrial fibrillation (preferably isolated), there is no change in peripheral resistance, which is the key determinant of DBP. Answer by Prof. Dayasagar Rao Hence, no change in DBP. Systolic blood pressure (SBP) is mainly determined by stroke volume, while diastolic blood pressure (DBP) is determined For Students, a Few Important Formulae Relevant to the by systemic vascular resistance (SVR), compliance of the Question is Mentioned Below arterial wall and duration of diastole. Normally, diastole is longer than systole; hence, mean arte- When we say atrioventricular (AV) dissociation, we mean rial pressure is not arithmetic mean of systolic and diastolic that the atria and the ventricles have independent rates and blood pressure. rhythms with a loss of synchrony, whereas in atrial fibrillation, Mean BP: DBP + 1/3rd of pulse pressure the extremely high-heart rates make atrial contractions inef- Pulse pressure: SBP − DBP fective while reducing the diastolic filling time between two Systolic pressure = diastolic pressure + pulse pressure beats, leading to reduced ventricular filling. The variation in Pulse pressure = stroke volume/arterial capacitance SBP in AV dissociation is due to variation in preload to ventricle Mean arterial pressure = cardiac output × total peripheral proportional to atrial contribution to ventricle filling. No atrial resistance contribution to ventricular filling occurs during simultaneous Cardiac output =heart rate × stroke volume contraction of atria and ventricles, and maximum contribu- Total peripheral resistance: blood viscosity × vascular tion by atria occurs when atrial contraction precedes ventric- resistance ular contraction. Thus, in both these conditions, stroke volume is effectively reduced. Since DBP is not influenced by stroke volume, there are no changes seen. Q2. Pulsus Paradoxus Mechanism in CCP and Tamponade Answer by Prof. Sampath Answer by Prof. Dayasagar Rao Arterial blood pressure is defined as lateral pressure exerted Pulsus paradoxus is a misnomer, meaning that it is not by contained column of blood on the walls of arteries. reversal of the normal but, in fact, exaggeration of the nor- Systolic blood pressure: It is the maximum pressure mal fall in systolic blood pressure (SBP) during inspiration exerted in the arteries during systole of heart. It is calculated (normally 4–5 mm Hg). This term was first introduced by as a product of heart rate and stroke volume. Adolf Kussmaul (1983) to describe marked inspiratory fall in Diastolic blood pressure: It is the minimum pressure in the SBP, which is associated with chronic constrictive peri- the arteries during diastole of heart. carditis (CCP). Clinically, the term pulsus paradoxus applies (It is multifactorial, depending on blood vessel diameter, to an exaggerated inspiratory fall in SBP > 10 mm Hg, which vessel elasticity, blood viscosity, and total blood volume) occurs due to left ventricular underfilling (►Fig. 1). Common to all pericardial diseases, the underlying mech- Determinants of systolic Determinants of diastolic anism is the smaller LV diastolic volumes that are produced blood pressure: BP: during inspiration which, in turn, reduce the stroke volume 1. Volume of blood ejected 1. Volume of blood remained and a subsequently increased fall in SBP. 2. Compliance of arterial wall 2. Compliance of arterial wall It is important to appreciate that RA/RV/LV are intra- 3. Rate of runoff (resistance) 3. Peripheral resistance pericardial but LA is extrapericardial. In CCP, there is published online DOI https://doi.org/ ©2020. Women in Cardiology and Related Sciences. December 31, 2020 10.1055/s-0040-1722560. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/). Thieme Medical and Scientific Publishers Pvt. Ltd. A-12, 2nd Floor, Sector 2, Noida-201301 UP, India Student’s Corner–2 Jyotsna et al. 365 dissociation of intrathoracic pressure from intrapericar- Thus, pulsus paradoxus in cardiac tamponade is due to dial chambers, due to thickened and fibrosed pericardium; exaggerated ventricular interaction, whereas in CCP, it is consequently, negative intrathoracic pressure is transmit- due to dissociation of intrathoracic pressure from intrap- ted to extrapericardial structures–LA (fall in LA pressure) ericardial chambers. but not to intra pericardial structures like LV. Consequently, negative gradient results between LA and LV–LA pressure Answer by Prof. Sampath is lower than LV pressure, resulting in underfilling of LV; Pulsus paradoxus (parodoxic pulse or paradoxical pulse) is an consequently, low-stroke volume and fall in SBP . abnormally large decrease in stroke volume, systolic blood In contrast, among patients with cardiac tamponade, pressure (SBP), and pulse wave amplitude during inspiration. negative intrathoracic pressure is transmitted to intrap- Decrease in SBP by more than 10 mm hg on inspiration is ericardial chambers RA/RV/LV and better filling of RA/RV. diagnostic. Because of limited pericardial space in tamponade, RV fills How to measure pulsus paradoxus: difference between at expense of LV filling, resulting in underfilling of LV–low- two pressures on sphygmomanometer when stroke volume and fall in SBP. 1. Onset of Korotkoff sounds (expiration only). 2. Korotkoff sounds are audible throughout the respiratory cycle. Cardiac tamponade: Pulses paradoxus is commonly seen in cardiac tamponade, due to the intact cardiac transmission of respiratory variations of intrathoracic pressure. Key underlying pathophysiology in cardiac tamponade: Cardiac transmission of respiratory variations of intratho- racic pressures are maintained (►Fig. 2). Causes of absent of pulsus paradoxus in cardiac tam- ponade are as follows: Aortic regurgitation, atrial septal defect, severe LV dys- function, LV hypertrophy, RV hypertrophy, severe hypoten- sion, pericardial adhesions, and localized effusion. Chronic constrictive pericarditis (CCP): Pulsus para- doxus is usually absent in CCP due to the absence of cardiac transmission of respiratory variation of intrathoracic pres- Fig. 1 Inspiratory fall of systemic arterial pressure. sure secondary to fibrous nonelastic pericardium. Fig. 2 Diagrammatic representation of mechanism of pulsus paradoxus in cardiac tamponade. Indian Journal of Cardiovascular Disease in Women WINCARS Vol. 5 No. 4/2020 © 2020 Women in Cardiology and Related Sciences. 366 Student’s Corner–2 Jyotsna et al. It may be seen in effusive variant of CCP, which constitutes ventricles, with preserved systolic function in pure con- around 20% of total CCP. strictive pericarditis, whereas in restrictive cardiomyopa- Pulsus paradoxus in effusive CCP: thy, systolic dysfunction is also present in majority. Visceral pericardium is fixed and fibrous, encasing heart in Two hemodynamic features are seen in CCP: a contracted, nonelastic pericardium, which prevents trans- • Dissociation of intrathoracic pressure from intrapericar- mission of negative intrathoracic pressure during inspiration dial chambers. to the heart, limiting ventricular filling during late diastole • Exaggerated ventricular interactions are present in CCP when pericardium has reached its elastic limit. When there is only and form the basis of marked respiratory variation a concomitant effusion, ventricular filling is impeded during in constriction. the entire diastolic cycle due to the tamponading effect of the Audible arteriovenous (AV) valve regurgitation may be effusion. Under a tense pericardium, an effusion, which may present in restrictive cardiomyopathy but unusual in CCP. have otherwise been unnoticeable, mimics signs of tampon- Thus, JVP reflects the restrictive ventricular diastolic dys- ade in effusive CCP. function–elevated JVP, which either fails to fall or increases Due to tamponading effect of the overlying effusion, with on inspiration. Kussmaul’s sign is classical of CCP, but can also underlying tense pericardium, there will be an exaggerated occur in patients with severe RV dysfunction in restrictive compression of the left ventricle by the deviated septum cardiomyopathy. during right ventricular filling secondary to chamber inter- Exaggerated “X” and “Y” descent is a rule in constriction dependence in limited pericardial space, which leads to pul- (►Fig. 3) but blunted (even obliteration of ‘X’) in restrictive sus paradoxus. cardiomyopathy, consequent to RV systolic dysfunction or Reverse pulsus paradoxus: Increase in SBP with inspiration. significant tricuspid regurgitation. The “A” & “V” waves are Example: hypertrophic cardiomyopathy (HOCM), iso- insignificant. rhythmic atrioventricular (AV) dissociation, and intermittent
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