Keyphrases
Phosphodiesterase Type 5 Inhibitors
100%
Sildenafil
100%
Headache
100%
Blood Flow Velocity
100%
Cerebral Blood Flow Velocity
100%
Placebo
50%
Middle Cerebral Artery
50%
Cyclic GMP
33%
Temporal Artery
33%
Heart Rate
33%
Brachial Artery Diameter
16%
Arterial Dilatation
16%
Inhalation
16%
Cerebral Arteries
16%
Single-photon Emission Computed Tomography (SPECT)
16%
Increased Blood Pressure
16%
Pericranial muscles
16%
Cyclic nucleotides
16%
Blood Pressure
16%
Diastolic Blood Pressure
16%
Therapeutic Agents
16%
Cerebral Hemodynamics
16%
High-frequency Ultrasound
16%
Radial Artery
16%
Glyceryl Trinitrate
16%
Arterial Diameter
16%
Pressure Rate
16%
Tenderness
16%
Author Studies
16%
Regional Cerebral Blood Flow (rCBF)
16%
Transcranial Doppler
16%
Placebo-controlled
16%
Selective Inhibitor
16%
Non-vascular
16%
Xenon
16%
Headache Response
16%
Medicine and Dentistry
Headache
100%
Sildenafil
100%
Brain Blood Flow
100%
Phosphodiesterase V Inhibitor
100%
Placebo
66%
Middle Cerebral Artery
50%
Temporal Artery
33%
Hemodynamic
33%
Cyclic GMP
33%
Radial Artery
33%
Diastolic Blood Pressure
16%
Transcranial Doppler
16%
Cyclic Nucleotide
16%
Exhalation
16%
Glyceryl Trinitrate
16%
Artery Dilatation
16%
Blood Pressure
16%
Single-Photon Emission Computed Tomography
16%
Elevated Blood Pressure
16%
Phosphodiesterase V
16%
Neuroscience
Headache
100%
Sildenafil
100%
Phosphodiesterase V
100%
Placebo
66%
Middle Cerebral Artery
50%
Cyclic Guanosine Monophosphate
33%
Cyclic Nucleotide
16%
Crossover Study
16%
Transcranial Doppler
16%
Single-Photon Emission Computed Tomography
16%