He just had a lot itching all over his body. Dear Smitha, Thank you for your question. Thus, weather has no role in affecting this pressure. There are many causes of high pulmonary pressures. The most likely cause in your fathers case is his long standing heart valve problem.
Nitric oxide lowers PA pressure but only lasts for a very short time.
Flolan lasts for a longer time but must be given intravenously and is very expensive. I hope you find this information useful. Information provided in the heart forum is for general purposes only. Only your physician can provide specific diagnoses and therapies. Please feel free to write back with additional questions.