Orientador: Francisco José Teixeira Neto / Resumo: O desenvolvimento de monitores oscilométricos de pressão arterial (MOPA) que produzam resultados confiáveis é de grande importância em felinos domésticos. O objetivo deste estudo foi comparar o desempenho de dois MOPA com algoritmos específicos para a espécie felina (petMAPclassic e petMAPgraphic) na estimativa da pressão arterial invasiva (PAI), em um modelo experimental, com a realização de ovariohisterectomia ou orquiectomia eletiva no final do estudo. Oito gatos adultos sadios, duas fêmeas e seis machos (3,2 a 5,5 kg) foram pré-medicados pela via intramuscular com midazolam (0,2 mg/kg), cetamina (7 mg/kg) e metadona (0,1 mg/kg). A anestesia foi induzida com propofol e mantida com isoflurano sob ventilação mecânica. Durante a anestesia, os manguitos dos MOPA foram posicionados no membro torácico (MT) e na base da cauda, enquanto a PAI foi registrada a partir da artéria podal dorsal. Variações na pressão arterial média (PAM) invasiva entre aproximadamente 40 a 100 mmHg foram induzidas por meio de ajustes na concentração de isoflurano ao final da expiração e/ou nas taxas de infusão intravenosa de dopamina (n = 8), norepinefrina (n = 1) ou fenilefrina (n = 1). Em cada faixa de pressão estável (PAM invasiva oscilando em até ± 5 mmHg), três ou duas mensurações simultâneas entre os MOPA e a PAI foram obtidas com o manguito em cada posição. A concordância entre os métodos testados (MOPA) e o método de referência (PAI) foi analisada por meio do método de Bland-Altman para medidas ... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The development of oscillometric blood pressure (OBP) monitors that produce reliable results in feline patients is of great importance. The aim of this study was compare the performance of two species-specific OBP monitors (petMAPclassic and petMAPgraphic) for estimating invasive blood pressure (IBP) in anesthetized cats, in an experimental model, with the performance of elective ovariohysterectomy and orchiectomy at the end of the study. Eight healthy adult cats, 2 females and 4 males (3.2 to 5.5 kg), were premedicated with midazolam (0.2 mg/kg), ketamine (7 mg/kg) and methadone (0.1 mg/kg) administered intramuscularly. Anesthesia was induced with propofol and maintained with isoflurane under mechanical ventilation. During the anesthesia, OBP cuffs were placed on the thoracic limb and on the base of the tail while IBP was recorded from a dorsal pedal artery. Invasive mean arterial pressure (MAP) was changed between approximately 40 to 100 mmHg by means of adjustments in the end-tidal isoflurane concentrations and/or intravenous infusion rates of dopamine (n = 8), norepinephrine (n = 1), or phenylephrine (n = 1). For each steady state blood pressure condition (invasive MAP varying by < ± 5 mmHg) three to two measurements were recorded simultaneously with the OBP and IBP monitors, with the cuff in each position. Agreement between the tested (OBP) and the reference (IBP) methods was analyzed by the Bland-Altman method for multiple measures on the same individual; while the abil... (Complete abstract click electronic access below) / Mestre

Les auto-tensiomètres (AT) sont parmi les dispositifs les plus utilisés en clinique et à domicile pour la mesure de la pression artérielle (PA). Ces appareils utilisent deux algorithmes heuristiques (Height-Based/HB et Slope-Based/SB) pour déterminer les pressions artérielles systoliques (PAS) et diastoliques (PAD) à partir de l'enregistrement de la pression oscillométrique dans le brassard. La mise sur le marché de ces appareils est actuellement assujettie à la directive 93/42/CE, qui nécessite une étude clinique basée sur une comparaison avec des mesures de la PA par auscultation. Cette méthode, qui consiste à détecter des sons de Korotkoff dans l'artère auscultée, présente l'inconvénient d'être praticien dépendante et engendre une incertitude sur la mesure de la PAS et de la PAD. Il est donc nécessaire de s'assurer de la fiabilité de ces instruments en proposant un dispositif expérimental de référence permettant en outre de pallier l'étude clinique qui s'avère longue et coûteuse. Cette thèse est dédiée à la mise en place de ce dispositif ou chaîne de référence, qui associe un banc d'essai permettant la validation des auto-tensiomètres et une base de données de mesure de PA. Afin de réaliser notre objectif, une étude clinique a été réalisée à l'hôpital Nord de Marseille à l'issue d'un examen de coronarographie. L'étude, réalisée sur 115 patients, compare des mesures de pression invasives (mesures de référence) à des mesures de pression non-invasives : des mesures auscultatoires, des mesures via un auto-tensiomètre commercial et des mesures oscillométriques. Ces dernières ont été réalisées concomitamment avec la PA invasive. / Automated blood pressure (ABP) devices are among the most commonly used devices for diagnosis arterial blood pressure (BP) for clinical and home use. These devices use two heuristic algorithms (Height-Based/HB and Slope-Based/SB) to determine the systolic blood pressure (SBP) and the diastolic blood pressure (DBP) from the recording of an oscillometric pressure signal collected using an inflatable cuff. Currently ABP are in the scope of Directive 93/42/CE, which requires a clinical study based on a comparison of BP measurements using auscultatory method. Unfortunately auscultatory measurements have the disadvantage of the uncertainties related to perception of Korotkoff sounds, leading to an uncertainty of measuring SBP and DBP. Therefore it is necessary to ensure the reliability of these instruments and to propose an experimental reference chain to validate ABP devices without returning to expensive and long clinical campaign. The purpose of this thesis is to create and develop a calibration chain for measuring arterial BP, which is composed of database of arterial BP measurements and a patient simulator for regenerating oscillometric measurements. To achieve our target, a clinical study was conducted at the northern hospital of Marseille (l'hôpital Nord) after a coronary exam. The clinical study of 115 patients compares invasive blood pressure measurements (reference measurements) and non-invasive blood pressure measurements: auscultatory measurements, measurements using a commercial automated blood pressure device and oscillometric measurements. The latter were carried out simultaneously with the invasive BP measurements.