Is nitro spray contraindicated when someone is short of breath without chest pain? :thnkg:pt. just had diagnosis of CHF and just came back from hospital at beginning of month once pneumonia was cleared.vitals - BP - 143/86 P - 80 O2 sats- 80% on 100% non rebreathe 28 resps/min - indrawing abdominals and at the neck - diaphorectic - palept. denied having chest/jaw/L arm painI administered one spray of nitro sublingually - thinking that it would help with his SOB... once EMT arrived they said - shouldn't have done that. I need to learn ...please give feedback.