Biomedical subjects

J Martino

Publications and source records attributed to J Martino.

At least 19 recordsLinked to original sources

PubMed2004

Measurement of the generalized polarizabilities of the proton in virtual Compton scattering at Q2=0.92 and 1.76 GeV2.

We report a virtual Compton scattering study of the proton at low c.m. energies. We have determined the structure functions P(LL)-P(TT)/epsilon and P(LT), and the electric and magnetic generalized polarizabilities (GPs) alpha(E)(Q2) and beta(M)(Q2) at momentum transfer Q(2)=0.92 and 1.76 GeV2. The electric GP shows a strong falloff with Q2, and its global behavior does not follow a simple dipole form. The magnetic GP shows a rise and then a falloff; this can be interpreted as the dominance of a long-distance diamagnetic pion cloud at low Q2, compensated at higher Q2 by a paramagnetic contribution from piN intermediate states.

Journal Article↗

PubMed2002

Deuterium-deuterium fusion dynamics in low-density molecular-cluster jets irradiated by intense ultrafast laser pulses.

Following the interaction of superintense, short pulse lasers and plasmas, ions can be accelerated to velocities sufficient to drive nuclear fusion reactions, in particular, by the process of Coulomb explosion of clusters [T. Ditmire, Nature (London) 398, 491 (1999)]]. We show here how short bursts of neutrons can be produced using a jet of low-density deuterated methane clusters. Ion velocity distributions were simultaneously measured by a Thomson parabola mass spectrometer, demonstrating deuteron energies up to 120 keV. We show that, in such conditions, nuclear fusion will occur not only in the hot plasma core, but also in the cold outer region by collision processes.

Journal Article↗

PubMed2001

Dynamics of the 16O(e, e'p) reaction at high missing energies.

We measured the cross section and response functions for the quasielastic 16O(e,e'p) reaction for missing energies 25< or =E(m)< or =120 MeV at missing momenta P(m)< or =340 MeV/c. For 25<E(m)<50 MeV and P(m) approximately 60 MeV/c, the reaction is dominated by a single 1s(1/2) proton knockout. At larger P(m), the single-particle aspects are increasingly masked by more complicated processes. Calculations which include pion exchange currents, isobar currents, and short-range correlations account for the shape and the transversity, but for only half of the magnitude of the measured cross section.

Journal Article↗

PubMed2000

[Primary aortoenteric fistula].

Aortoenteric fistulas are a very unlikely cause of digestive bleeding. We present the case of a fifty six year old patient with a primary aortoduodenal fistula who consulted because of melena and a pulsating abdominal mass. He underwent three digestive endoscopies without arriving at any diagnosis. A computed axial tomography and an angiography showed an aneurysm of the abdominal aorta. With an exploring laparotomy a fistula was identified between the aneurysm and the fourth portion of the duodenum. An aortoaortic bypass was carried out followed by a surgical fix of the duodenum. The patient was released six days after the operation.

Aortic Aneurysm, Abdominal↗

PubMed1998

Object-oriented analysis and design: a methodology for modeling the computer-based patient record.

The article highlights the importance of an object-oriented analysis and design (OOAD) methodology for the computer-based patient record (CPR) in the military environment. Many OOAD methodologies do not adequately scale up, allow for efficient reuse of their products, or accommodate legacy systems. A methodology that addresses these issues is formulated and used to demonstrate its applicability in a large-scale health care service system. During a period of 6 months, a team of object modelers and domain experts formulated an OOAD methodology tailored to the Department of Defense Military Health System and used it to produce components of an object model for simple order processing. This methodology and the lessons learned during its implementation are described. This approach is necessary to achieve broad interoperability among heterogeneous automated information systems.

Abstracting and Indexing↗

PubMed1998

The field hospital at Zagreb: tri-service medical care in a peacekeeping operation.

The objective of this investigation was to provide military medical planners with insights into the specific materiel, skills, and information requirements demanded by humanitarian missions through review of approximately 16,000 records from a tri-service medical patient database used at the field hospital in Zagreb, Croatia, during Operation Provide Promise. This review describes (1) the origin, rationale, structure, and implementation of the database; (2) the patients who used medical services provided by the hospital; (3) the diagnoses encountered in outpatient visits, admissions, and surgical operations; and (4) the distribution of medical services used by various subgroups of interest.

Adolescent↗

PubMed1994

Clinical application of the forearm tourniquet.

We undertook this prospective study of 148 consecutive hand and wrist procedures to evaluate the safety and efficacy of the forearm tourniquet. Patients were assigned to three groups based on tourniquet pressure used, ranging from 50 to 125 mmHg above systolic blood pressure. The forearm tourniquet was well tolerated by all patients. No patient had neurologic complications. Minimal intraoperative bleeding occurred when the pressure was greater than 75 mmHg above systolic blood pressure. The forearm tourniquet is a safe and effective means of providing a bloodless field for wrist and hand surgery.

Forearm↗

PubMed1994

Nonembolic high-probability perfusion lung scan for pulmonary thromboembolism.

Pulmonary thromboembolism (PTE) is a disease whose diagnosis in the emergency department constitutes a challenge to the clinician. Perfusion lung scans have been important in helping in this context, mainly because of the fact that a normal perfusion lung scan rules out the presence of a clinically significant PTE. Nevertheless, false-positive results are sometimes observed, causing a diagnostic dilemma. An example is a case of bronchogenic carcinoma involving a pulmonary artery or its branches. In such patients, some characteristics of the scintigraphic imaging could guide the diagnosis toward a nonembolic origin of the perfusion defect. A case of small-cell carcinoma of the lung involving the left pulmonary artery whose clinical presentation suggested considering the possibility of PTE is reported. The so-called "stripe sign" is reviewed, and certain clues for the differential diagnosis of a massive and one-sided perfusion defect are discussed.

Aged↗

PubMed1993