The effect of chroni cocaine administration on hemodynamic stability and neurohumoral mediators during isoflurane anesthesia and shock in rats

Berend Mets, C. B. Pantuck, J. Diaz, E. Soo

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Background: The aim of this investigation was to determine whether chronic cocaine administration altered endogenous vasoconstrictor secretion in response to hypotension from isoflurane anesthesia and blood loss in rats. Methods: Rats received continuous intravenous infusions of saline (n=11) or cocaine 6 mg kg-1 d-1 (n=13) or 18 mg kg-1 d-1 (n=12) for 13 days. On day 14, rats were anesthetized with intraperitoneal ketamine and xylazine and a femoral artery catheter and a tracheotomy performed to allow lung ventilation (PaCO2, 30-40 mmHg). After baseline parameters were noted, isoflurane was introduced to end-tidal concentrations of 0.7% for 10 min (1/2 MAC), 1.4% for 10 min (MAC) and again 0.7% for 10 min (1/2 MAC-2) when 5 ml of blood was withdrawn (SHOCK). Blood samples were drawn to assess arterial blood gas indices at various time points as well as plasma epinephrine, angiotensin II and vasopressin at MAC, 1/2 MAC-2 and SHOCK. Results: Rats administered cocaine had higher oxygen extraction, required higher minute ventilation and had lower PaO2 values than rats administered saline despite similar body temperatures and hematocrits. Isoflurane administration resulted in significant dose dependent but similar blood pressure decreases in all study groups. Plasma epinephrine, angiotensin II and vasopressin concentrations were not different in saline or cocaine treated animals at any time point. Conclusion: These data suggest that chronic cocaine treatment in rats does not impair endogenous vasoconstrictor secretion nor alter the heart rate and blood pressure response to isoflurane and blood loss.

Original languageEnglish (US)
Pages (from-to)377-384
Number of pages8
JournalActa Anaesthesiologica Scandinavica
Volume45
Issue number3
DOIs
StatePublished - Mar 14 2001

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Isoflurane
Cocaine
Shock
Anesthesia
Hemodynamics
Vasoconstrictor Agents
Vasopressins
Angiotensin II
Epinephrine
Ventilation
Blood Pressure
Xylazine
Tracheotomy
Ketamine
Femoral Artery
Body Temperature
Hematocrit
Intravenous Infusions
Hypotension
Catheters

All Science Journal Classification (ASJC) codes

  • Anesthesiology and Pain Medicine

Cite this

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title = "The effect of chroni cocaine administration on hemodynamic stability and neurohumoral mediators during isoflurane anesthesia and shock in rats",
abstract = "Background: The aim of this investigation was to determine whether chronic cocaine administration altered endogenous vasoconstrictor secretion in response to hypotension from isoflurane anesthesia and blood loss in rats. Methods: Rats received continuous intravenous infusions of saline (n=11) or cocaine 6 mg kg-1 d-1 (n=13) or 18 mg kg-1 d-1 (n=12) for 13 days. On day 14, rats were anesthetized with intraperitoneal ketamine and xylazine and a femoral artery catheter and a tracheotomy performed to allow lung ventilation (PaCO2, 30-40 mmHg). After baseline parameters were noted, isoflurane was introduced to end-tidal concentrations of 0.7{\%} for 10 min (1/2 MAC), 1.4{\%} for 10 min (MAC) and again 0.7{\%} for 10 min (1/2 MAC-2) when 5 ml of blood was withdrawn (SHOCK). Blood samples were drawn to assess arterial blood gas indices at various time points as well as plasma epinephrine, angiotensin II and vasopressin at MAC, 1/2 MAC-2 and SHOCK. Results: Rats administered cocaine had higher oxygen extraction, required higher minute ventilation and had lower PaO2 values than rats administered saline despite similar body temperatures and hematocrits. Isoflurane administration resulted in significant dose dependent but similar blood pressure decreases in all study groups. Plasma epinephrine, angiotensin II and vasopressin concentrations were not different in saline or cocaine treated animals at any time point. Conclusion: These data suggest that chronic cocaine treatment in rats does not impair endogenous vasoconstrictor secretion nor alter the heart rate and blood pressure response to isoflurane and blood loss.",
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The effect of chroni cocaine administration on hemodynamic stability and neurohumoral mediators during isoflurane anesthesia and shock in rats. / Mets, Berend; Pantuck, C. B.; Diaz, J.; Soo, E.

In: Acta Anaesthesiologica Scandinavica, Vol. 45, No. 3, 14.03.2001, p. 377-384.

Research output: Contribution to journalArticle

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T1 - The effect of chroni cocaine administration on hemodynamic stability and neurohumoral mediators during isoflurane anesthesia and shock in rats

AU - Mets, Berend

AU - Pantuck, C. B.

AU - Diaz, J.

AU - Soo, E.

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N2 - Background: The aim of this investigation was to determine whether chronic cocaine administration altered endogenous vasoconstrictor secretion in response to hypotension from isoflurane anesthesia and blood loss in rats. Methods: Rats received continuous intravenous infusions of saline (n=11) or cocaine 6 mg kg-1 d-1 (n=13) or 18 mg kg-1 d-1 (n=12) for 13 days. On day 14, rats were anesthetized with intraperitoneal ketamine and xylazine and a femoral artery catheter and a tracheotomy performed to allow lung ventilation (PaCO2, 30-40 mmHg). After baseline parameters were noted, isoflurane was introduced to end-tidal concentrations of 0.7% for 10 min (1/2 MAC), 1.4% for 10 min (MAC) and again 0.7% for 10 min (1/2 MAC-2) when 5 ml of blood was withdrawn (SHOCK). Blood samples were drawn to assess arterial blood gas indices at various time points as well as plasma epinephrine, angiotensin II and vasopressin at MAC, 1/2 MAC-2 and SHOCK. Results: Rats administered cocaine had higher oxygen extraction, required higher minute ventilation and had lower PaO2 values than rats administered saline despite similar body temperatures and hematocrits. Isoflurane administration resulted in significant dose dependent but similar blood pressure decreases in all study groups. Plasma epinephrine, angiotensin II and vasopressin concentrations were not different in saline or cocaine treated animals at any time point. Conclusion: These data suggest that chronic cocaine treatment in rats does not impair endogenous vasoconstrictor secretion nor alter the heart rate and blood pressure response to isoflurane and blood loss.

AB - Background: The aim of this investigation was to determine whether chronic cocaine administration altered endogenous vasoconstrictor secretion in response to hypotension from isoflurane anesthesia and blood loss in rats. Methods: Rats received continuous intravenous infusions of saline (n=11) or cocaine 6 mg kg-1 d-1 (n=13) or 18 mg kg-1 d-1 (n=12) for 13 days. On day 14, rats were anesthetized with intraperitoneal ketamine and xylazine and a femoral artery catheter and a tracheotomy performed to allow lung ventilation (PaCO2, 30-40 mmHg). After baseline parameters were noted, isoflurane was introduced to end-tidal concentrations of 0.7% for 10 min (1/2 MAC), 1.4% for 10 min (MAC) and again 0.7% for 10 min (1/2 MAC-2) when 5 ml of blood was withdrawn (SHOCK). Blood samples were drawn to assess arterial blood gas indices at various time points as well as plasma epinephrine, angiotensin II and vasopressin at MAC, 1/2 MAC-2 and SHOCK. Results: Rats administered cocaine had higher oxygen extraction, required higher minute ventilation and had lower PaO2 values than rats administered saline despite similar body temperatures and hematocrits. Isoflurane administration resulted in significant dose dependent but similar blood pressure decreases in all study groups. Plasma epinephrine, angiotensin II and vasopressin concentrations were not different in saline or cocaine treated animals at any time point. Conclusion: These data suggest that chronic cocaine treatment in rats does not impair endogenous vasoconstrictor secretion nor alter the heart rate and blood pressure response to isoflurane and blood loss.

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