There are multiple definitions:

1. in situ hybridization(English)

   • technique that allows for precise localization of a specific segment of nucleic acid within a histologic section
   • DNA, FISH
   • Histochemistry
   • https://www.ncb…e/docs/techish/

2. isolated systolic hypertension(English)

   • when diastolic blood pressure < 80 mmHg and systolic blood pressure > 130 mmHg; most common form of high blood pressure in people older than 65 years
   • HTN, MAP, PP, SBP, Ea
   • Hypertension, Risk factor
   • http://dx.doi.o…med.2016.08.032
   • https://doi.org…per.2004.08.019

3. isocapnic hyperventilation(English)

   • leads to decreased mucociliary clearance (MCC), both in asthmatic and healthy subjects. Inhaled frusemide, an inhibitor of the Na+/K+/2Cl- and NaCl co-transporters on the basolateral membrane of the epithelial cell, prevents the airway narrowing provoked by ISH with dry air. The co-transport system controls epithelial cell volume and chloride secretion and, thus, frusemide has the potential to modify the rate of recovery of periciliary fluid volume during and after ISH with dry air, and hence affect MCC
   • MCC
   • Pulmonology, Asthma
   • https://doi.org…936.96.09040716

4. idiopathic stabbing headache(English)

   • occur due to paroxysmal firing of trigeminal pathways and a defect in pain control mechanisms. Any defect in pain control mechanisms appears to be localized to the affected areas
   • IPH
   • Headache, Pain
   • https://doi.org…55/2017/3879127