Abstract

CABEZAS, GA; MELEAN, LM  and  TORREALBA, HE. Consumo Máximo de Oxígeno (Vo2max) para predecir riesgos Postoperatorios en Cirugía Abdominal Electiva. RFM [online]. 2001, vol.24, n.2, pp.163-171. ISSN 0798-0469.

It has been shown a relationship between maximal oxygen uptake (VO2max), and the rise of postoperative complications in thoracic surgery but that relationship has not been well studied in abdominal surgery. We undertaken a prospective, descriptive study to define the VO2max capacity to predict post surgical complications in 37 patients who underwent elective abdominal surgery at the Vargas, Hospital of Caracas and we compared with the American Society of Anesthesiologists (ASA) score and with Multifactorial Goldman score. VO2max was calculated by using Manero et al. indirect method obtained from a Latinoamerican population. It is an easy and inexpensive method that requires to perform three progressive sub maximal work loads (<65% maximal heart rate). Patients had to go up and down a 25 cm high step stair during 3 minutes having a different frequency each load., and one minute of rest in between load. VO2max is obtained in Manero’s tables according to sex, age and the heart rate of maximal load achieved. Statistics : c2, Logistic regression, Relative Risk (RR), specificity, sensitivity, positive predictive value and negative predictive value. Results: Mean VO2max was 1.2 ± 0.38 L/min. Nine (24%) had VO2max less than 1 L/min and 3 of them were among of patients who had complications after surgery. They presented a Odd Ratio of 3.1, RR of 2. 38, sensitivity of 42.85%, specificity of 80%, positive predictive value of 33% and negative predictive value of 85.7%. Predictive capacity of VO2max was better than ASA and Goldman III. We recommended the use of VO2max to predict post surgical complications and Manero’s test to calculate VO2max.

Keywords : Maximal oxygen uptake; Abdominal surgery; Post surgical risk; Presurgical evaluation.