Safety and feasibility of local myocardial hypothermia.
Catheter Cardiovasc Interv
; 87(5): 877-83, 2016 Apr.
Article
em En
| MEDLINE
| ID: mdl-26269225
ABSTRACT
BACKGROUND:
In ST-elevation myocardial infarction (STEMI), reduction in time to reperfusion of the occluded coronary artery reduces infarct size. In animal models, an additional reduction of infarct size was observed when hypothermia was induced before reperfusion, despite a longer ischemic time. However, several human studies did not corroborate this positive effect, which is believed to be in part due to the inability of systemic induced hypothermia to induce sufficient decrease of local myocardial temperature before reperfusion. Providing rapid local myocardial hypothermia by intracoronary infusion of saline before reperfusion in patients with STEMI may overcome this problem. In this study, we evaluate the safety and feasibility of providing rapid intracoronary myocardial hypothermia in patients undergoing intracoronary blood flow measurements based on thermodilution with continuous infusion of saline at room temperature. METHODS ANDRESULTS:
In 53 patients with stable angina (SA) and 20 patients with STEMI, a total of 215 measurements were performed. The measurements consisted of continuous selective intracoronary infusion of saline at room temperature with rates between 10 ml/min and 30 ml/min. Temperature changes compared to initial blood temperature (Tb ) were measured at the tip of the infusion catheter (Ti ) and distally in the coronary artery (Td ). In patients with SA, Ti was -5.65 ± 1.41°C (range -9.27 to -2.28) and Td was -0.78 ± 0.51°C (range -3.27 to -0.23°C). In patients with STEMI, Ti was -7.45 ± 0.51°C (range -8.21 to -6.56) and Td was -1.37 ± 0.82°C (range -4.62 to -0.74°C). In all patients, steady-state intracoronary hypothermia was achieved within 15 sec and could be maintained without noticeable complications.CONCLUSION:
This study demonstrates the safety and feasibility of inducing intracoronary hypothermia by selective infusion of saline at room temperature in patients with SA and STEMI. Steady-state hypothermia could be achieved and maintained quickly, easily, and safely using common PCI techniques. Therefore, our findings warrant further studies to the use of intracoronary hypothermia to enhance myocardial salvage in acute myocardial infarction.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Regulação da Temperatura Corporal
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Cateterismo Cardíaco
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Cloreto de Sódio
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Angina Estável
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Intervenção Coronária Percutânea
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Infarto do Miocárdio com Supradesnível do Segmento ST
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Hipotermia Induzida
/
Miocárdio
Tipo de estudo:
Evaluation_studies
/
Observational_studies
/
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
Catheter Cardiovasc Interv
Assunto da revista:
CARDIOLOGIA
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Holanda