Title | Preclinical Pharmacology of CW002: A Nondepolarizing Neuromuscular Blocking Drug of Intermediate Duration, Degraded and Antagonized by l-cysteine-Additional Studies of Safety and Efficacy in the Anesthetized Rhesus Monkey and Cat. |
Publication Type | Journal Article |
Year of Publication | 2016 |
Authors | Sunaga H, Savarese JJ, McGilvra JD, Heerdt PM, Belmont MR, Van Ornum SG, Murrell MT, Malhotra JK, Savard PM, Jeannotte E, Petty BJ, Allen E, Carnathan GW |
Journal | Anesthesiology |
Volume | 125 |
Issue | 4 |
Pagination | 732-743 |
Date Published | 2016 Oct |
ISSN | 1528-1175 |
Abstract | BACKGROUND: CW002, a novel nondepolarizing neuromuscular blocking agent of intermediate duration, is degraded in vitro by L-cysteine; CW002-induced neuromuscular blockade (NMB) is antagonized in vivo by exogenous L-cysteine. Further, Institutional Animal Care and Use Committee-approved studies of safety and efficacy in eight anesthetized monkeys and six cats are described. METHODS: Mean arterial pressure, heart rate, twitch, and train-of-four were recorded; estimated dose producing 95% twitch inhibition (ED95) for NMB and twitch recovery intervals from 5 to 95% of baseline were derived. Antagonism of 99 to 100% block in monkeys by L-cysteine (50 mg/kg) was tested after bolus doses of approximately 3.75 to 20 × ED95 and after infusions. Vagal and sympathetic autonomic responses were recorded in cats. Dose ratios for [circulatory (ED20) or autonomic (ED50) changes/ED95 (NMB)] were calculated. RESULTS: ED95s of CW002 in monkeys and cats were 0.040 and 0.035 mg/kg; L-cysteine readily antagonized block in monkeys: 5 to 95% twitch recovery intervals were shortened to 1.8 to 3.6 min after 3.75 to 10 × ED95 or infusions versus 11.5 to 13.5 min during spontaneous recovery. ED for 20% decrease of mean arterial pressure (n = 27) was 1.06 mg/kg in monkeys; ED for 20% increase of HR (n = 27) was 2.16 mg/kg. ED50s for vagal and sympathetic inhibition in cats were 0.59 and >0.80 mg/kg (n = 14 and 15). Dose ratios for [circulatory or autonomic changes/ED95 (NMB)] were all more than 15 × ED95. CONCLUSIONS: The data further verify the neuromuscular blocking properties of CW002, including rapid reversal by L-cysteine of 100% NMB under several circumstances. A notable lack of autonomic or circulatory effects provided added proof of safety and efficacy. |
DOI | 10.1097/ALN.0000000000001254 |
Alternate Journal | Anesthesiology |
PubMed ID | 27466033 |