All articles starting with H
20,046 articles
Heart of palm
Heart of palm (palmito) is the edible apical bud of certain palms, mainly the clumping peach palm (Bactris gasipaes), sold canned or jarred; Costa Rica leads exports, and harvesting kills single-stem palms but not peach palm clumps.
Heart of Stone (2023 film)
Heart of Stone is a 2023 Netflix/Skydance spy thriller directed by Tom Harper, starring Gal Gadot as Charter agent Rachel Stone protecting the Heart AI from hacker Keya Dhawan (Alia Bhatt). Released August 11, 2023; 33.1M first-three-day views; 31% on Rotten Tomatoes.
Heart of the Beast
Heart of the Beast is a 2026 Paramount survival thriller directed by David Ayer, starring Brad Pitt as Special Forces veteran James Belmont stranded in Alaska with combat dog Odin after a plane crash; filmed in New Zealand, released September 25, 2026.
Heart of the Congos
Heart of the Congos is a 1977 roots reggae album by the Congos, produced by Lee "Scratch" Perry at his Black Ark studio in Kingston, Jamaica.
Heart of the TVA
Heart of the TVA is the fourth episode of Loki season 2 (October 26, 2023), written by Eric Martin and Katharyn Blair, directed by Benson and Moorhead, ending with the Temporal Loom exploding.
Heart on My Sleeve (song)
"Heart on My Sleeve" is a 2023 song with AI-generated vocals imitating Drake and The Weeknd, made by the anonymous producer Ghostwriter and removed from streaming platforms.
Heart Peaks
Heart Peaks: Pleistocene shield volcano with rhyolite lava domes in the Northern Cordilleran Volcanic Province, NW British Columbia, Canada; 2,012 m, no Holocene eruptions, low ash hazard, epithermal gold-silver prospect.
Heart Protection Study
MRC/BHF Heart Protection Study (HPS): UK randomized 2×2 factorial trial of simvastatin 40 mg and antioxidant vitamins in 20,536 high-risk people; simvastatin cut major vascular events 24%, vitamins showed no benefit.
Heart rate
Heart rate, or pulse, is the number of heartbeats per minute; normal at rest is 60–100 bpm. Set by the sinoatrial node pacemaker and tuned by autonomic, hormonal, and mechanical inputs; measured manually or by wearables and chest straps.
Heart rate across the lifespan
Heart rate across the lifespan describes how heart rate changes with age: about 150 beats per minute in infancy, near 70 in adulthood, with maximum rate declining steadily.
Heart rate monitor
Heart rate monitor: device measuring beats per minute, via chest-strap ECG electrodes or wrist-worn optical PPG in smartwatches and fitness trackers. Chest straps are the validation criterion; wrist accuracy falls as exercise intensity rises.
Heart rate response to exercise and training
Heart rate response to exercise and training describes how heart rate rises during exercise, how endurance training lowers resting heart rate, and how quickly heart rate recovers afterward.
Heart rate variability
Heart rate variability (HRV), also called heart period variability, measures beat-to-beat R-R interval variation on the ECG as a non-invasive marker of autonomic nervous system function, analyzed in time and frequency domains (SDNN, RMSSD, LF, HF bands) and applied in cardiology, mental health, and sepsis prediction.
Heart Rhythm
Heart Rhythm: Elsevier monthly journal (ISSN 1547-5271) launched May 2004, official journal of the Heart Rhythm Society and Cardiac Electrophysiology Society, covering cardiac arrhythmias and electrophysiology.
Heart Rhythm Society
Heart Rhythm Society (HRS), formerly NASPE (North American Society of Pacing and Electrophysiology), founded 1979 in Boston; professional society for cardiac pacing and electrophysiology, renamed 2004, 9,700+ members in 93 countries, based in Washington, DC.
HEART score
The HEART score is a bedside risk tool for emergency department chest pain patients, scoring History, ECG, Age, Risk factors, and Troponin to predict major cardiac events within 6 weeks.
Heart Signal (하트시그널)
Heart Signal (하트시그널) is Channel A's Korean dating reality series, five seasons 2017–2026, in which cast members cohabit in a Signal House, send anonymous nightly texts, and a celebrity panel deduces the final couples.
Heart sounds
Heart sounds are transient noises from valve closure heard during auscultation. The first two sounds, S1 and S2, are normal, while S3 and S4 are usually abnormal.
Heart Sutra
The Heart Sutra, or Prajnaparamita Heart Sutra, is a short Mahayana Buddhist scripture summarizing the Perfection of Wisdom teachings on emptiness, recited daily across East Asia.
Heart symbol
Heart symbol (♥): stylized scalloped shape for love and the Sacred Heart. First love imagery in the c. 1255 Roman de la Poire; scalloped form 14th century; popular in 16th-century Europe.
Heart the Lover
Heart the Lover is Lily King's 2025 Grove Press novel about a 1980s college love triangle, narrator "Jordan," Sam, and Yash, told in three parts across 30 years and linked to Writers & Lovers.
Heart transplantation
Heart transplantation: surgical replacement of a failing heart with a donor heart. First done by Barnard in 1967; 1-year survival now near 90%; main risks are rejection, vasculopathy, and immunosuppression side effects.
Heart valve
Heart valve: the four cardiac valves (mitral, tricuspid, aortic, pulmonary), passive pressure-driven leaflet/cusp mechanics, valve disease epidemiology, repair versus replacement, TAVI, and 2024-2025 trial changes.
Heart valve dysplasia
Heart valve dysplasia is a congenital malformation in which one or more heart valves is thickened and malformed, causing regurgitation or stenosis. Includes X-linked FLNA-related cardiac valvular dysplasia and canine tricuspid valve dysplasia.
Heart Valve Prosthesis Implantation
Heart valve prosthesis implantation replaces diseased native valves with mechanical or bioprosthetic devices, surgically since 1952 and by transcatheter methods (TAVI/TAVR) since the early 2000s, with anticoagulation and durability trade-offs.
Heart-Shaped Box
"Heart-Shaped Box" (also written "Heart Shaped Box") is a 1993 Nirvana song by Kurt Cobain, lead single of In Utero. Charted No. 1 US Modern Rock, No. 5 UK; distinct from Alice in Chains' "Man in the Box".
Heart-type fatty acid binding protein
Heart-type fatty acid binding protein (H-FABP, FABP3) is a 14-15 kDa cytosolic fatty acid transporter abundant in heart and skeletal muscle, used as an early biomarker of myocardial infarction but inferior to high-sensitivity troponin.
Heart–liver transplantation
Heart–liver transplantation is a surgical procedure that replaces both the heart and liver with organs from a single donor, used for combined heart and liver failure and first performed in 1984.
Heart–lung transplantation
Heart–lung transplantation is an operation replacing a patient's heart and both lungs en bloc with donor organs, first done successfully at Stanford in 1981 and now rare, under 50 cases a year worldwide.
Heart's Content Cable Station
The Heart's Content Cable Station in Newfoundland is the former western terminus of the first permanent transatlantic telegraph cable, landed in 1866 and relaying messages until 1965, now a museum.