Jaume Mesquida1, Hyung Kook Kim, Michael R Pinsky. 1. Cardiopulmonary Research Laboratory, Department of Critical Care Medicine, University of Pittsburgh Medical Center, 606 Scaife Hall, 3550 Terrace Street, Pittsburgh, PA 15261, USA.
Abstract
PURPOSE: We evaluated the impact of increasing tidal volume (V (t)), decreased chest wall compliance, and left ventricular (LV) contractility during intermittent positive-pressure ventilation (IPPV) on the relation between pulse pressure (PP) and LV stroke volume (SV(LV)) variation (PPV and SVV, respectively), and intrathoracic blood volume (ITBV) changes. METHODS: Sixteen pentobarbital-anesthetized thoracotomized mongrel dogs were studied both before and after propranolol-induced acute ventricular failure (AVF) (n = 4), with and without chest and abdominal pneumatic binders to decrease chest wall compliance (n = 6), and during V (t) of 5, 10, 15, and 25 ml/kg (n = 6). SV(LV) and right ventricular stroke volume (SV(RV)) were derived from electromagnetic flow probes around aortic and pulmonary artery roots. Arterial pressure was measured in the aorta using a fluid-filled catheter. Arterial PPV and SVV were calculated over three breaths as (max - min)/[(max + min)/2]. ITBV changes during ventilation were inferred from the beat-to-beat volume differences between SV(RV) and SV(LV). RESULTS: Arterial PP and SV(LV) were tightly correlated during IPPV under all conditions (r (2) = 0.85). Both PPV and SVV increased progressively as V (t) increased and with thoraco-abdominal binding, and tended to decrease during AVF. SV(RV) phasically decreased during inspiration, whereas SV(LV) phasically decreased 2-3 beats later, such that ITBV decreased during inspiration and returned to apneic values during expiration. ITBV decrements increased with increasing V (t) or with thoraco-abdominal binding, and decreased during AVF owing to variations in SV(RV), such that both PPV and SVV tightly correlated with inspiration-associated changes in SV(RV) and ITBV. CONCLUSION: Arterial PP and SV(LV) are tightly correlated during IPPV and their relation is not altered by selective changes in LV contractility, intrathoracic pressure, or V (t). However, contractility, intrathoracic pressure, and V (t) directly alter the magnitude of PPV and SVV primarily by altering the inspiration-associated decreases in SV(RV) and ITBV.
PURPOSE: We evaluated the impact of increasing tidal volume (V (t)), decreased chest wall compliance, and left ventricular (LV) contractility during intermittent positive-pressure ventilation (IPPV) on the relation between pulse pressure (PP) and LV stroke volume (SV(LV)) variation (PPV and SVV, respectively), and intrathoracic blood volume (ITBV) changes. METHODS: Sixteen pentobarbital-anesthetized thoracotomized mongrel dogs were studied both before and after propranolol-induced acute ventricular failure (AVF) (n = 4), with and without chest and abdominal pneumatic binders to decrease chest wall compliance (n = 6), and during V (t) of 5, 10, 15, and 25 ml/kg (n = 6). SV(LV) and right ventricular strokevolume (SV(RV)) were derived from electromagnetic flow probes around aortic and pulmonary artery roots. Arterial pressure was measured in the aorta using a fluid-filled catheter. Arterial PPV and SVV were calculated over three breaths as (max - min)/[(max + min)/2]. ITBV changes during ventilation were inferred from the beat-to-beat volume differences between SV(RV) and SV(LV). RESULTS: Arterial PP and SV(LV) were tightly correlated during IPPV under all conditions (r (2) = 0.85). Both PPV and SVV increased progressively as V (t) increased and with thoraco-abdominal binding, and tended to decrease during AVF. SV(RV) phasically decreased during inspiration, whereas SV(LV) phasically decreased 2-3 beats later, such that ITBV decreased during inspiration and returned to apneic values during expiration. ITBV decrements increased with increasing V (t) or with thoraco-abdominal binding, and decreased during AVF owing to variations in SV(RV), such that both PPV and SVV tightly correlated with inspiration-associated changes in SV(RV) and ITBV. CONCLUSION: Arterial PP and SV(LV) are tightly correlated during IPPV and their relation is not altered by selective changes in LV contractility, intrathoracic pressure, or V (t). However, contractility, intrathoracic pressure, and V (t) directly alter the magnitude of PPV and SVV primarily by altering the inspiration-associated decreases in SV(RV) and ITBV.
Authors: F Michard; S Boussat; D Chemla; N Anguel; A Mercat; Y Lecarpentier; C Richard; M R Pinsky; J L Teboul Journal: Am J Respir Crit Care Med Date: 2000-07 Impact factor: 21.405
Authors: Cory M Alwardt; Bhavesh M Patel; Amelia Lowell; Jeff Dobberpuhl; Jeffrey B Riley; Patrick A DeValeria Journal: J Extra Corpor Technol Date: 2013-09
Authors: Sebastian Acosta; Mubbasheer Ahmed; Suellen M Yin; Ken M Brady; Daniel J Penny; Craig G Rusin Journal: Biomed Signal Process Control Date: 2020-04-17 Impact factor: 3.880
Authors: Massimo Antonelli; Marc Bonten; Jean Chastre; Giuseppe Citerio; Giorgio Conti; J Randall Curtis; Daniel De Backer; Goran Hedenstierna; Michael Joannidis; Duncan Macrae; Jordi Mancebo; Salvatore M Maggiore; Alexandre Mebazaa; Jean-Charles Preiser; Patricia Rocco; Jean-François Timsit; Jan Wernerman; Haibo Zhang Journal: Intensive Care Med Date: 2012-01-04 Impact factor: 17.440
Authors: Thomas G V Cherpanath; Lonneke Smeding; Alexander Hirsch; Wim K Lagrand; Marcus J Schultz; A B Johan Groeneveld Journal: BMC Anesthesiol Date: 2015-10-07 Impact factor: 2.217