Pregnant.
Not have informed consent for the present clinical trial, or do not fully understand the meaning of informed consent.
With acute myocardial infarction with ST segment elevation in the first 12 hours from the onset of symptoms.
With any acute coronary syndrome complicated with acute pulmonary edema, cardiogenic shock and / or malignant ventricular arrhythmias.
In which a cardiac catheterization is planned a priori to be performed via femoral, brachial or ulnar.
Patients in whom first attempt of arterial puncture is performed by 2nd year interventional cardiology fellow or by physician in charge.
Participating in another clinical trial.
Be allergic or have contraindications to nitroglycerin or other nitrates.
Any phosphodiesterase 5 inhibitor (sildenafil, tadalafil, avanafil, vardenafil) has been taken within 72 hours prior to the study.

NCT03304496_exc_T1
Condition
Pregnant
NCT03304496_exc_T3
Condition
acute myocardial infarction
NCT03304496_exc_T4
Condition
ST segment elevation
NCT03304496_exc_T5
Temporal
in the first 12 hours from the onset of symptoms
NCT03304496_exc_T6
Reference_point
the onset of symptoms
NCT03304496_exc_T7
Condition
acute coronary syndrome
NCT03304496_exc_T8
Condition
acute pulmonary edema
NCT03304496_exc_T9
Condition
cardiogenic shock
NCT03304496_exc_T10
Condition
ventricular arrhythmias
NCT03304496_exc_T11
Qualifier
malignant
NCT03304496_exc_T12
Scope
acute pulmonary edema, cardiogenic shock and / or malignant ventricular arrhythmias.
NCT03304496_exc_T13
Procedure
cardiac catheterization
NCT03304496_exc_T14
Qualifier
femoral
NCT03304496_exc_T15
Qualifier
brachial
NCT03304496_exc_T16
Qualifier
ulnar
NCT03304496_exc_T17
Scope
femoral, brachial or ulnar
NCT03304496_exc_T20
Condition
allergic
NCT03304496_exc_T21
Drug
nitroglycerin
NCT03304496_exc_T22
Drug
nitrates
NCT03304496_exc_T23
Scope
nitroglycerin or other nitrates
NCT03304496_exc_T24
Condition
contraindications
NCT03304496_exc_T25
Scope
allergic or have contraindications
NCT03304496_exc_T26
Drug
phosphodiesterase 5 inhibitor
NCT03304496_exc_T27
Drug
sildenafil
NCT03304496_exc_T28
Drug
tadalafil
NCT03304496_exc_T29
Drug
avanafil
NCT03304496_exc_T30
Drug
vardenafil
NCT03304496_exc_T31
Scope
sildenafil, tadalafil, avanafil, vardenafil)
NCT03304496_exc_T32
Temporal
within 72 hours prior to the study
NCT03304496_exc_T33
Reference_point
study