https://www.selleckchem.com/products/leptomycinb.html To study the prognostic value of the resistance to the cerebrospinal fluid outflow (Rout) obtained in the lumbar infusion test in idiopathic normal pressure hydrocephalus (iNPH), as well as the pulse pressure amplitudes in the different periods of the test and other new variables extracted by Neuropicture® software. Patients with 'probable iNPH' who underwent a lumbar infusion test were retrospectively revised. The positive predictive values (PPV) of the cutoff point of the best prognostic accuracy of the Rout, the basal pulse pressure amplitude (AMPo), the pulse pressure amplitude during the first 10min (AMP ), the plateau pulse pressure amplitude (AMPmes), the Rout pulse pressure amplitude (AMP ), the time to reach the plateau (T), and the slope until reaching the plateau were determined. Patients were categorized either as responders or non-responders. The study included 64 responders patients and 16 non-responders patients. The PPV of Rout>15mmHg/mL/min was 91.7%; AMPo>2.34mmHg 91.3%; AMP >4.34mmHg 83.3%; AMPmes>12.44mmHg 84.6%; AMP >6.34mmHg 85%; T<634s 86.7%; p>0.040mmHg/s 96.3%. Rout is a valid criterion to indicate a ventricular shunt. Pulse pressure amplitudes in the different periods of the lumbar infusion test, in addition to T and P, are other variables whose positivity is indicative of shunt response and should be considered in the diagnostic protocol of the iNPH. Rout is a valid criterion to indicate a ventricular shunt. Pulse pressure amplitudes in the different periods of the lumbar infusion test, in addition to T and P, are other variables whose positivity is indicative of shunt response and should be considered in the diagnostic protocol of the iNPH. Coronavirus disease 2019 (COVID-19) manifests symptoms as common etiologies of respiratory tract infections (RTIs). During the pandemic of COVID-19, identifying the etiologies correctly from patients with RTI symptoms was crucial in not only disease