Peer-reviewed veterinary case report
Non-invasive heart output monitoring in anesthetized dogs compared
By Mantovani, Matheus M et al.·Published in BMC veterinary research·2017·Departamento de Clí, Brazil·View original on PubMed →
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Original publication title: Clinical monitoring of cardiac output assessed by transoesophageal echocardiography in anaesthetised dogs: a comparison with the thermodilution technique.
- Species:
- dog
Plain-English summary
A group of eight dogs undergoing elective surgery were monitored for heart function using a new, less invasive method called transoesophageal echocardiography (TEE) compared to a traditional method called thermodilution. The dogs were given medications to help with anesthesia, and their heart output was measured during both normal and low blood pressure conditions. The study found that TEE provided reliable heart output readings, especially during normal blood pressure, but was less reliable during low blood pressure. Overall, TEE could be a good option for monitoring heart function in dogs during surgery with less risk than traditional methods.
People also search for: dog heart monitoring during surgery · transoesophageal echocardiography in dogs · low blood pressure in dogs during anesthesia
Abstract
BACKGROUND: Cardiac output (CO) is an important haemodynamic parameter to monitor in patients during surgery. However, the majority of the techniques for measuring CO have a limited application in veterinary practice due to their invasive approach and associated complexity and risks. Transoesophageal echocardiography (TEE) is a technique used to monitor cardiac function in human patients during surgical procedures and allows CO to be measured non-invasively. This prospective clinical study aimed to compare the transoesophageal echocardiography using a transgastric view of the left ventricular outflow tract (LVOT) and the thermodilution (TD) technique for the assessment of CO during mean arterial pressure of 65-80 mmHg (normotension) and <65 mmHg (hypotension) in dogs undergoing elective surgery. Eight dogs were pre-medicated with acepromazine (0.05 mg/kg, IM), tramadol (4 mg/kg, IM) and atropine (0.03 mg/kg, IM), followed by anaesthetic induction with propofol (3-5 mg/kg IV) and maintenance with isoflurane associated with a continuous infusion rate of fentanyl (bolus of 3 μg/kg followed by 0.3 μg/kg/min). The CO was measured by TEE (CO) and TD (CO) at the end of expiration during normotension and hypotension (induced by isoflurane). RESULTS: There was a strong positive correlation between COand CO​​(r = 0.925; P < 0.0001). The bias between COand COwas 0.14 ± 0.29 L/min (limits of agreement, -0.44 to 0.72 L/min). The percentage error of CO measured by the two methods was 12.32%. In addition, a strong positive correlation was found between COand COduring normotension (r = 0.995; P < 0.0001) and hypotension (r = 0.78; P = 0.0223). CONCLUSIONS: The results of this study indicated that the transgastric view of the LVOT by TEE was a minimally invasive alternative to clinically monitoring CO in dogs during anaesthesia. However, during hypotension, the CO obtained by TEE was less reliable, although still acceptable.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/29121915/