Human health and medicine

Helen Schucman

Helen Schucman (1909, New York City) was a Columbia University research psychologist who scribed A Course in Miracles (1965-1972) from an inner Voice she identified as Jesus, publishing anonymously; copyright assigned to the Foundation for Inner Peace.

Helical tomotherapy

Helical tomotherapy, also known as tomotherapy, is an intensity-modulated radiation therapy technique in which a rotating fan beam traces a helix around the moving patient, with integrated CT image guidance.

Helicobacter pylori associated gastric ulcer

Helicobacter pylori associated gastric ulcer (ICD-11 DA60.1): a stomach ulcer caused by H. pylori infection, accounting for 70% of gastric ulcers; eradication therapy prevents recurrence and rebleeding.

Helicobacter pylori eradication therapy

Helicobacter pylori eradication therapy is a combination antibiotic and acid-suppressing treatment, usually 14 days long, that cures H. pylori infection, healing ulcers and reducing gastric cancer risk.

Helicobacter pylori induced gastritis

Helicobacter pylori induced gastritis (ICD-11 DA42.1) is stomach lining inflammation from H. pylori infection, progressing from acute to chronic and atrophic gastritis, a gastric cancer risk factor; discovered by Marshall and Warren in 1982, treated by eradication therapy.

Helicobacter-pylori associated duodenal ulcer

Helicobacter-pylori associated duodenal ulcer (ICD-11 DA63.1) is a duodenal ulcer caused by chronic H. pylori infection, which accounts for over 90% of duodenal ulcers; eradication therapy, now optimized bismuth quadruple therapy for 14 days, cures the ulcer and prevents recurrence.

Helicoid peripapillary chorioretinal degeneration

Helicoid peripapillary chorioretinal degeneration (Sveinsson chorioretinal atrophy, atrophia areata) is a rare autosomal dominant TEAD1-related retinal dystrophy with bilateral wing-shaped chorioretinal atrophy radiating from the optic disc, onset in infancy, sometimes with congenital anterior polar cataracts.

Heliotherapy

Heliotherapy: therapeutic use of natural sunlight, also called climate therapy, for skin disease. Ancient Egyptian and Indian roots; Finsen's 1903 Nobel Prize; Dead Sea regimens for psoriasis; risks include sunburn and skin cancer.

Heliox

Heliox is a helium-oxygen breathing gas mixture (typically 70-80% helium) whose low density reduces turbulent airflow resistance in narrowed airways; used for airway obstruction, asthma, COPD, croup, and diving, with limited trial evidence of outcome benefit.

Heller myotomy

Heller myotomy is a surgical operation for achalasia that divides the lower esophageal sphincter muscle, usually laparoscopically, relieving swallowing difficulty in 90 to 95% of patients.

HELLO trial

The HELLO trial was an international, cluster-randomized controlled trial led by Elie Azoulay that tested the four-week Hello Bundle, reducing burnout among ICU professionals across 60 countries.

HELLP syndrome

HELLP syndrome is a severe pregnancy complication defined by hemolysis, elevated liver enzymes, and low platelets, usually arising with preeclampsia, affecting 0.2 to 0.8 percent of pregnancies and often requiring prompt delivery.

Helminthiasis

Helminthiasis, also called parasitic worm infection, is infection of humans with intestinal worms such as roundworm, whipworm, and hookworms, affecting an estimated 1.5 billion people.

Helminthic therapy

Helminthic therapy is an experimental treatment in which patients are deliberately infected with parasitic worms or dosed with their eggs to modulate the immune system in autoimmune disease.

Sep 21, 2026

Helmut Baumgartner

Helmut Baumgartner is an Austrian-trained cardiologist who directed adult congenital and valvular heart disease at University Hospital Münster, published landmark aortic stenosis research in 2000, and chaired ESC guidelines.

HELP-Vets study

HELP-Vets (Helping Veterans Experience Less Pain) study, NCT00230932, a VA cross-sectional cohort study (2006-2007, 528 veterans, VISN 22) evaluating the reliability of pain as the fifth vital sign and gaps in pain care.

Helsinki University Hospital

HUS Helsinki University Hospital (HUS Helsingin yliopistollinen sairaala) is Finland's largest healthcare provider, organizing specialized care in Uusimaa; 26,500 employees, 711,000 patients yearly, teaching hospital of the University of Helsinki.

Helsmoortel-Van der Aa syndrome

Helsmoortel-Van der Aa syndrome (HVDAS, ADNP syndrome, OMIM 615873) is a rare autosomal dominant neurodevelopmental disorder caused by de novo loss-of-function ADNP variants, featuring intellectual disability, autism, hypotonia, dysmorphic facies, and multi-organ problems.

HEMACORD

Hemacord (HPC, Cord Blood) is the first FDA-licensed cord blood hematopoietic progenitor cell therapy (BLA 125397, New York Blood Center, approved November 10, 2011) for unrelated donor transplantation for hematopoietic and immunologic reconstitution.

Hemadsorption Inhibition Tests

Hemadsorption inhibition tests are virological assays in which erythrocytes bind virus-infected cell monolayers and specific antiserum blocks that binding, identifying hemadsorbing viruses such as influenza, parainfluenza, and mumps, or quantifying myxovirus antibodies.

Hemagarbha pottali rasa

Hemagarbha pottali rasa (हेमगर्भपोट्टली), also Hemgarbha Pottali, is an Ayurvedic herbo-mineral pottali of purified mercury, sulphur, gold and copper bhasmas with aloe juice; a 125 mg emergency-care formulation for Rajayakshma and Sannipataj conditions.

Hemagglutination

Hemagglutination is the clumping of red blood cells by antibodies, lectins, or viral proteins such as influenza hemagglutinin binding sialic acid; it underlies blood typing and the hemagglutination inhibition assay used for influenza serology.

Hemagglutination assay

The hemagglutination assay is a laboratory test that detects viruses such as influenza by watching red blood cells clump; its inhibition form measures antibodies instead.

Hemagglutination inhibition assay

The hemagglutination inhibition assay (HAI) is a serological test that quantifies antibodies blocking virus-induced clumping of red blood cells, and is the primary method for measuring influenza antibody responses.

Hemagglutination Tests

Hemagglutination tests (HA, HI/HAI, Hirst test) detect and quantify viruses or antibodies by visible clumping of red blood cells via viral hemagglutinin; used for influenza diagnosis, vaccine antigenic characterization, and blood group typing.

Hemanatha rasa

Hemanatha rasa (Hemnath Ras), a classical Ayurvedic herbo-mineral rasa formulation from Bhaishajya Ratnavali 86/43-47, made from kajjali (mercury-sulfur) with gold, iron, coral and tin bhasmas, dosed 375 mg for urinary disorders.

Hemangioblastoma

Hemangioblastoma: benign WHO grade 1 vascular tumor of the CNS, mostly cerebellum and spinal cord; sporadic or von Hippel-Lindau (VHL)-associated; treated by resection or stereotactic radiosurgery.

Hemangioma

Hemangioma: a benign vascular tumor of clumped blood vessels; infantile hemangioma (strawberry mark) is the most common benign tumor of infancy, grows then involutes, treated with propranolol; distinct from vascular malformations; cherry and liver forms also occur.

Hematemesis

Hematemesis, vomiting of blood, signals upper GI bleeding from peptic ulcers, varices, or Mallory-Weiss tears; distinguished from hemoptysis by acidic, coffee-ground vomit and managed with endoscopy.