Objective: This paper evaluates the influence of the specific Xe ventilation images used to calculate differential function in quantitative ventilation-perfusion lung scans. Methods: Whole-lung differentials were determined on 43 Xe ventilationfl mTc-macroaggregated albumin perfusion studies. Ventilation calculations were performed for the firstbreath, up to three equilibrium and the composite ...

UNLABELLED An expert system was developed that interprets ventilation-perfusion lung scans. The use of such scans for suspected pulmonary embolism is ideal for computer-assisted diagnosis by expert systems. The data are digital, only a single disease entity is diagnosed or excluded, and well-established diagnostic criteria already exist for visual interpretation that can be easily integrated in...

Between January 1985 and December 1991, six patients underwent arterial and bronchial sleeve resections of the left upper lobe. Preoperative and postoperative spirometry, preoperative split pulmonary radionuclide ventilation/perfusion (V/Q) scans and postoperative bronchoscopy were obtained in four patients. Postoperative serial digital vascular images (DVI) of the pulmonary artery were obtaine...

Guidelines regarding operability of patients with lung cancer are well established. The measured and predicted pulmonary function provides a practical guide to the safety of lobectomy or pneumonectomy. We describe a patient who had an unexplained precipitous fall in preoperative FEV(1) that would have precluded a required pneumonectomy but for an urgent ventilation-perfusion (V/Q) scan. This ca...

UNLABELLED Use of a very low probability interpretation of ventilation/perfusion (V/Q) lung scans, if verified by prospective evaluation to have a low positive predictive value (PPV), will reduce the number of nondiagnostic interpretations of V/Q scans and may be particularly useful in patients with a relative contraindication to CT. The purpose of this investigation was to test the hypothesis ...

No single non invasive test has sufficient diagnostic accuracy to be used alone for diagnosing or ruling out pulmonary embolism. Therefore, modern diagnostic strategies for pulmonary embolism rely on combinations of non invasive tests such as plasma D-dimer measurement, lower limb venous compression ultrasonography, ventilation-perfusion lung scan and/or spiral CT, the results of which should b...

Introduction: Differentiating between ischemic cardiomyopathy (ICM) and idiopathic dilated cardiomyopathy (IDCM) is important as coronary revascularization can improve prognosis in the ischemic subgroup. Due to inherent problems of coronary angiography in patients with depressed ejection fraction (EF) introducing a noninvasive tool to diagnose those who will benefit from angiography seems...

in stable conditions.4 Acute effects of N-CPAP on arterial blood gas (ABG) values in a group of our patients with stable COPD are shown in Table 1. Finally, we agree together with de Lucas et all that the beneficial effect of N-CPAP in COPD is predominantly related to a better ventilation/perfusion relationship. In one 65-year-old patient with COPD, we performed a lung ventilatory scan (Fig 1) ...

Mrs. L., a 51 year old housewife, presented with a 2 cm. lump in the left breast, which she had first noticed three months previously. Excision biopsy revealed a very poorly differentiated adenocarcinoma with tumour in adjacent vessels. When radiotherapy was instituted 3 weeks later she complained of shortness of breath on exercise, and a dry cough. Over the following week she became increasing...